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* [PATCH] display/bridge: dsi2lvds tc358775 driver
@ 2020-02-27 14:03 ` Vinay Simha BN
  2020-03-03 15:09   ` Andrzej Hajda
  0 siblings, 1 reply; 8+ messages in thread
From: Vinay Simha BN @ 2020-02-27 14:03 UTC (permalink / raw)
  Cc: Vinay Simha BN, David Airlie, Daniel Vetter, Rob Herring,
	Andrzej Hajda, Neil Armstrong, Laurent Pinchart, Jonas Karlman,
	Jernej Skrabec, open list:DRM DRIVERS,
	open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	open list

dsi2lvds tc358775 bridge driver added
Tested in apq8016, ifc6309 board and panel
auo,b101xtn01

Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
---
 .../bindings/display/bridge/toshiba,tc358775.txt   | 106 ++++
 drivers/gpu/drm/bridge/Kconfig                     |  10 +
 drivers/gpu/drm/bridge/Makefile                    |   1 +
 drivers/gpu/drm/bridge/tc358775.c                  | 687 +++++++++++++++++++++
 4 files changed, 804 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
 create mode 100644 drivers/gpu/drm/bridge/tc358775.c

diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
new file mode 100644
index 0000000..c4c364d
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
@@ -0,0 +1,106 @@
+Toshiba TC358775 DSI to LVDS bridge bindings
+
+Required properties:
+ - compatible: "toshiba,tc358775"
+ - reg: i2c address of the bridge, 0x0f
+ - tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
+  be one of 1, 2, 3 or 4.
+ - tc, dual-link : To configure the LVDS transmitter either
+  as single-link or dual-link.
+ - tc, data-format: To configure the data formats
+   0 for VESA standard, 1 for JEIDA standard
+ - vdd-supply: 1.2V LVDS Power Supply
+ - vddio-supply: 1.8V IO Power Supply
+ - stby-gpios: Standby pin, Low active 
+ - reset-gpios: Hardware reset,	Low active 
+
+Required nodes:
+
+The TC358775 has two ports. Their connections are modelled using the OF
+graph bindings specified in Documentation/devicetree/bindings/graph.txt.
+
+- Video port 0 for the DSI input. The remote endpoint phandle should be a
+	reference to a valid mipi_dsi_host device node.
+- Video port 1 for the LVDS output.
+
+Example:
+
+	i2c@78b8000 {
+		/* On High speed expansion */
+		label = "HS-I2C2";
+		status = "okay";
+
+		tc_bridge: bridge@f {
+			status = "okay";
+
+			compatible = "toshiba,tc358775";
+			reg = <0x0f>;
+
+			tc,dsi-lanes = <4>;
+			tc,dual-link = <0>;
+			tc,data-format = <1>;
+
+			vdd-supply = <&pm8916_l2>;
+			vddio-supply = <&pm8916_l6>;
+
+			stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
+			reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+					d2l_in: endpoint {
+						remote-endpoint = <&dsi0_out>;
+					};
+				};
+
+				port@1 {
+					reg = <1>;
+					d2l_out: endpoint {
+						remote-endpoint = <&panel_in>;
+					};
+				};
+			};
+		};
+	};
+
+	panel: auo,b101xtn01 {
+			status = "okay";
+			compatible = "auo,b101xtn01";
+			power-supply = <&pm8916_l14>;
+
+			port {
+				panel_in: endpoint {
+					remote-endpoint = <&d2l_out>;
+				};
+			};
+	};
+
+	mdss@1a00000 {
+		status = "okay";
+
+		mdp@1a01000 {
+			status = "okay";
+		};
+
+		dsi@1a98000 {
+			status = "okay";
+			..
+			ports {
+				port@1 {
+					dsi0_out: endpoint {
+						remote-endpoint = <&d2l_in>;
+						data-lanes = <0 1 2 3>;
+					};
+				};
+			};
+		};
+
+		dsi-phy@1a98300 {
+			status = "okay";
+			..
+		};
+	};
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 8397bf7..d5528fa 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
 	---help---
 	  Toshiba TC358767 eDP bridge chip driver.
 
+config DRM_TOSHIBA_TC358775
+        tristate "Toshiba TC358775 LVDS bridge"
+        depends on OF
+        select DRM_KMS_HELPER
+        select REGMAP_I2C
+        select DRM_PANEL
+	select DRM_MIPI_DSI
+        ---help---
+          Toshiba TC358775 LVDS bridge chip driver.
+
 config DRM_TI_TFP410
 	tristate "TI TFP410 DVI/HDMI bridge"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 1eb5376..9b2c512 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
 obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
 obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
 obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
+obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
 obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
 obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
 obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
new file mode 100644
index 0000000..3db0f49
--- /dev/null
+++ b/drivers/gpu/drm/bridge/tc358775.c
@@ -0,0 +1,687 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * tc358775 DSI to LVDS bridge driver
+ *
+ * Copyright (C) 2020 InforceComputing
+ * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+/* #define DEBUG */
+/* #define TC358775_DEBUG */
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_probe_helper.h>
+
+/* Registers */
+
+/* DSI D-PHY Layer Registers */
+#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
+#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
+#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
+#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
+#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
+#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
+#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
+#define CLW_CNTRL       0x0040  /* Clock Lane Control */
+#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
+#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
+#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
+#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
+#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
+
+/* DSI PPI Layer Registers */
+#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
+#define PPI_BUSYPPI     0x0108
+#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
+#define PPI_LPTXTIMECNT 0x0114
+#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
+#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
+
+/* Analog timer function enable */
+#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
+#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
+#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
+#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
+#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
+#define PPI_D0S_CLRSIPOCOUNT    0x0164
+
+#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
+#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
+#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
+
+#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
+#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
+#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
+#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
+#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
+#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
+#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
+#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
+#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
+#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
+#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
+#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
+#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
+#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
+#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
+
+#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
+#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
+#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
+#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
+#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
+#define DSI_BUSYDSI     0x0208
+#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
+#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
+#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
+
+#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
+#define DSI_INTMASK     0x0224  /* Interrupt Mask */
+#define DSI_INTCLR      0x0228  /* Interrupt Clear */
+#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
+
+#define DSIERRCNT       0x0300  /* DSI Error Count */
+#define APLCTRL         0x0400  /* Application Layer Control */
+#define RDPKTLN         0x0404  /* Command Read Packet Length */
+
+#define VPCTRL          0x0450  /* Video Path Control */
+#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
+#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
+#define VTIM1           0x045C  /* Vertical Timing Control 1 */
+#define VTIM2           0x0460  /* Vertical Timing Control 2 */
+#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
+
+/* Mux Input Select for LVDS LINK Input */
+#define LVMX0003        0x0480  /* Bit 0 to 3 */
+#define LVMX0407        0x0484  /* Bit 4 to 7 */
+#define LVMX0811        0x0488  /* Bit 8 to 11 */
+#define LVMX1215        0x048C  /* Bit 12 to 15 */
+#define LVMX1619        0x0490  /* Bit 16 to 19 */
+#define LVMX2023        0x0494  /* Bit 20 to 23 */
+#define LVMX2427        0x0498  /* Bit 24 to 27 */
+
+#define LVCFG           0x049C  /* LVDS Configuration  */
+#define LVPHY0          0x04A0  /* LVDS PHY 0 */
+#define LVPHY1          0x04A4  /* LVDS PHY 1 */
+#define SYSSTAT         0x0500  /* System Status  */
+#define SYSRST          0x0504  /* System Reset  */
+/* GPIO Registers */
+#define GPIOC           0x0520  /* GPIO Control  */
+#define GPIOO           0x0524  /* GPIO Output  */
+#define GPIOI           0x0528  /* GPIO Input  */
+
+/* I2C Registers */
+#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
+#define I2CMADDR        0x0544  /* I2C Master Addressing */
+#define WDATAQ          0x0548  /* Write Data Queue */
+#define RDATAQ          0x054C  /* Read Data Queue */
+
+/* Chip ID and Revision ID Register */
+#define IDREG           0x0580
+
+#define TC358775XBG_ID  0x00007500
+
+/* Debug Registers */
+#define DEBUG00         0x05A0  /* Debug */
+#define DEBUG01         0x05A4  /* LVDS Data */
+
+#define DSI_CLEN_BIT		BIT(0)
+#define DIVIDE_BY_3		3 /* PCLK=DCLK/3 */
+#define LVCFG_LVEN_BIT		BIT(0)
+
+#define L0EN BIT(1)
+
+#define TC358775_VPCTRL_VSDELAY__MASK	0x3FF00000
+#define TC358775_VPCTRL_VSDELAY__SHIFT	20
+static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)
+{
+	return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
+			TC358775_VPCTRL_VSDELAY__MASK;
+}
+
+#define TC358775_VPCTRL_OPXLFMT__MASK	0x00000100
+#define TC358775_VPCTRL_OPXLFMT__SHIFT	8
+static inline uint32_t TC358775_VPCTRL_OPXLFMT(uint32_t val)
+{
+	return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
+			TC358775_VPCTRL_OPXLFMT__MASK;
+}
+
+#define TC358775_VPCTRL_MSF__MASK	0x00000001
+#define TC358775_VPCTRL_MSF__SHIFT	0
+static inline uint32_t TC358775_VPCTRL_MSF(uint32_t val)
+{
+	return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
+			TC358775_VPCTRL_MSF__MASK;
+}
+
+#define TC358775_LVCFG_PCLKDIV__MASK	0x000000f0
+#define TC358775_LVCFG_PCLKDIV__SHIFT	4
+static inline uint32_t TC358775_LVCFG_PCLKDIV(uint32_t val)
+{
+	return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
+			TC358775_LVCFG_PCLKDIV__MASK;
+}
+
+#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
+#define TC358775_LVCFG_LVDLINK__SHIFT                        0
+static inline uint32_t TC358775_LVCFG_LVDLINK(uint32_t val)
+{
+	return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
+			TC358775_LVCFG_LVDLINK__MASK;
+}
+
+static const struct reg_sequence tc_fixed_registers[] = {
+	{ 0x013C, 0x00040006 },
+	{ 0x0114, 0x00000004 },
+	{ 0x0164, 0x00000003 },
+	{ 0x0168, 0x00000003 },
+	{ 0x016C, 0x00000003 },
+	{ 0x0170, 0x00000003 },
+};
+
+static const struct reg_sequence tc_vesa_data_format_registers[] = {
+	{ 0x0480, 0x03020100 },
+	{ 0x0484, 0x08050704 },
+	{ 0x0488, 0x0F0E0A09 },
+	{ 0x048C, 0x100D0C0B },
+	{ 0x0490, 0x12111716 },
+	{ 0x0494, 0x1B151413 },
+	{ 0x0498, 0x061A1918 },
+};
+
+static const char * const regulator_names[] = {
+	"vdd",
+	"vddio"
+};
+
+struct tc_data {
+	struct i2c_client	*i2c;
+
+	struct device		*dev;
+	struct regmap		*regmap;
+
+	struct drm_bridge	bridge;
+	struct drm_connector	connector;
+	struct drm_panel	*panel;
+
+	enum drm_connector_status status;
+	struct device_node *host_node;
+	struct mipi_dsi_device *dsi;
+	u8 num_dsi_lanes;
+
+	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+	struct gpio_desc	*reset_gpio;
+	struct gpio_desc	*stby_gpio;
+	u32                     rev;
+	u8                      dual_link; /* single-link or dual-link */
+	u8			data_format; /* VESA or JEIDA */
+};
+
+static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
+{
+	return container_of(b, struct tc_data, bridge);
+}
+
+static inline struct tc_data *connector_to_tc(struct drm_connector *c)
+{
+	return container_of(c, struct tc_data, connector);
+}
+
+static void tc_bridge_pre_enable(struct drm_bridge *bridge)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	struct device *dev = &tc->dsi->dev;
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
+	if (ret < 0) {
+		dev_err(dev, "regulator enable failed, %d\n", ret);
+		return;
+	}
+	mdelay(10);
+
+	gpiod_set_value(tc->stby_gpio, 0);
+	mdelay(10);
+
+	gpiod_set_value(tc->reset_gpio, 0);
+	ndelay(50);
+
+	drm_panel_prepare(tc->panel);
+}
+
+static void tc_bridge_disable(struct drm_bridge *bridge)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	struct device *dev = &tc->dsi->dev;
+	int ret;
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
+	if (ret < 0)
+		dev_err(dev, "regulator disable failed, %d\n", ret);
+	mdelay(10);
+
+	gpiod_set_value(tc->stby_gpio, 1);
+	mdelay(10);
+
+	gpiod_set_value(tc->reset_gpio, 1);
+	ndelay(50);
+
+	drm_panel_disable(tc->panel);
+}
+
+static void tc_bridge_post_disable(struct drm_bridge *bridge)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+
+	drm_panel_unprepare(tc->panel);
+}
+
+#ifdef TC358775_DEBUG
+static u32 d2l_read(struct tc_data *tc, u16 reg)
+{
+	int ret;
+	u32 data;
+
+	ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
+	if (ret)
+		return ret;
+
+	pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
+
+	return data;
+}
+#endif
+
+static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
+{
+	int ret = 0;
+
+	ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
+
+#ifdef TC358775_DEBUG
+	d2l_read(tc, reg);
+#endif
+	return ret;
+}
+
+static void tc_bridge_enable(struct drm_bridge *bridge)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	int ret;
+	u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
+	u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
+	u32 val = 0;
+	struct drm_display_mode *mode;
+
+	mode = &bridge->encoder->crtc->state->adjusted_mode;
+
+	hbpr = 0;
+	hpw  = mode->hsync_end - mode->hsync_start;
+	vbpr = 0;
+	vpw  = mode->vsync_end - mode->vsync_start;
+
+	htime1 = (hbpr << 16) + hpw;
+	vtime1 = (vbpr << 16) + vpw;
+
+	hfpr = mode->hsync_start - mode->hdisplay;
+	hsize = mode->hdisplay;
+	vfpr = mode->vsync_start - mode->vdisplay;
+	vsize = mode->vdisplay;
+
+	htime2 = (hfpr << 16) + hsize;
+	vtime2 = (vfpr << 16) + vsize;
+
+	ret = regmap_read(tc->regmap, IDREG, &tc->rev);
+	if (ret) {
+		dev_err(tc->dev, "can not read device ID: %d\n", ret);
+		return;
+	}
+	pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
+
+	d2l_write(tc, SYSRST, 0x000000FF);
+	mdelay(30);
+
+	ret = regmap_register_patch(tc->regmap,
+				    tc_fixed_registers,
+				    ARRAY_SIZE(tc_fixed_registers));
+	if (ret)
+		return;
+
+	val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
+	d2l_write(tc, PPI_LANEENABLE, val);
+	d2l_write(tc, DSI_LANEENABLE, val);
+
+	d2l_write(tc, PPI_STARTPPI, 0x00000001);
+	d2l_write(tc, DSI_STARTDSI, 0x00000001);
+
+	val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
+
+	if (tc->connector.display_info.bpc == 8) {/* RGB888 */
+		val |= TC358775_VPCTRL_OPXLFMT(1);
+		d2l_write(tc, VPCTRL, val);
+	} else {				/* RGB666 */
+		val |= TC358775_VPCTRL_MSF(1);
+		d2l_write(tc, VPCTRL, val);
+	}
+
+	d2l_write(tc, HTIM1, htime1);
+	d2l_write(tc, VTIM1, vtime1);
+	d2l_write(tc, HTIM2, htime2);
+	d2l_write(tc, VTIM2, vtime2);
+
+	d2l_write(tc, VFUEN, 0x00000001);
+	d2l_write(tc, SYSRST, 0x00000004);
+	d2l_write(tc, LVPHY0, 0x00040006);
+
+	if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */
+		ret = regmap_register_patch
+			(tc->regmap,
+			 tc_vesa_data_format_registers,
+			 ARRAY_SIZE(tc_vesa_data_format_registers));
+		if (ret)
+			return;
+	}
+
+	d2l_write(tc, VFUEN, 0x00000001);
+
+	val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
+	if (tc->dual_link)
+		val |= TC358775_LVCFG_LVDLINK(1);
+
+	d2l_write(tc, LVCFG, val);
+
+	drm_panel_enable(tc->panel);
+}
+
+static int tc_connector_get_modes(struct drm_connector *connector)
+{
+	struct tc_data *tc = connector_to_tc(connector);
+	struct edid *edid;
+	unsigned int count;
+
+	if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
+		count = tc->panel->funcs->get_modes(tc->panel, connector);
+		if (count > 0)
+			return count;
+	}
+
+	edid = drm_get_edid(connector, tc->i2c->adapter);
+	if (!edid)
+		return 0;
+
+	drm_connector_update_edid_property(connector, edid);
+	count = drm_add_edid_modes(connector, edid);
+	kfree(edid);
+
+	return count;
+}
+
+static int tc_connector_mode_valid(struct drm_connector *connector,
+				   struct drm_display_mode *mode)
+{
+	struct tc_data *tc = connector_to_tc(connector);
+
+	/* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
+	if ((mode->clock > 135000 && tc->dual_link == 0) ||
+	    (mode->clock > 270000 && tc->dual_link == 1))
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static struct drm_encoder *
+tc_connector_best_encoder(struct drm_connector *connector)
+{
+	struct tc_data *tc = connector_to_tc(connector);
+
+	return tc->bridge.encoder;
+}
+
+static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
+	.get_modes = tc_connector_get_modes,
+	.mode_valid = tc_connector_mode_valid,
+	.best_encoder = tc_connector_best_encoder,
+};
+
+static const struct drm_connector_funcs tc_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
+{
+	u32 num_lanes;
+	u8 dual_link, data_format;
+
+	of_property_read_u8(np, "tc,dual-link", &dual_link);
+	of_property_read_u8(np, "tc,data-format", &data_format);
+	of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
+
+	if (num_lanes < 1 || num_lanes > 4)
+		return -EINVAL;
+
+	tc->num_dsi_lanes = num_lanes;
+	tc->dual_link = dual_link;
+	tc->data_format = data_format;
+
+	tc->host_node = of_graph_get_remote_node(np, 0, 0);
+	if (!tc->host_node)
+		return -ENODEV;
+
+	of_node_put(tc->host_node);
+
+	return 0;
+}
+
+int tc358775_attach_dsi(struct tc_data *tc)
+{
+	struct device *dev = &tc->i2c->dev;
+	struct mipi_dsi_host *host;
+	struct mipi_dsi_device *dsi;
+	int ret = 0;
+	const struct mipi_dsi_device_info info = { .type = "tc358775",
+							.channel = 0,
+							.node = NULL,
+						};
+
+	host = of_find_mipi_dsi_host_by_node(tc->host_node);
+	if (!host) {
+		dev_err(dev, "failed to find dsi host\n");
+		return -EPROBE_DEFER;
+	}
+
+	dsi = mipi_dsi_device_register_full(host, &info);
+	if (IS_ERR(dsi)) {
+		dev_err(dev, "failed to create dsi device\n");
+		ret = PTR_ERR(dsi);
+		goto err_dsi_device;
+	}
+
+	tc->dsi = dsi;
+
+	dsi->lanes = tc->num_dsi_lanes;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(dev, "failed to attach dsi to host\n");
+		goto err_dsi_attach;
+	}
+
+	return 0;
+
+err_dsi_attach:
+	mipi_dsi_device_unregister(dsi);
+err_dsi_device:
+	return ret;
+}
+
+static int tc_bridge_attach(struct drm_bridge *bridge)
+{
+	struct tc_data *tc = bridge_to_tc(bridge);
+	struct drm_device *drm = bridge->dev;
+	int ret;
+
+	/* Create LVDS connector */
+	drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
+	ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
+				 DRM_MODE_CONNECTOR_LVDS);
+	if (ret)
+		return ret;
+
+	if (tc->panel)
+		drm_panel_attach(tc->panel, &tc->connector);
+
+	drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
+
+	ret = tc358775_attach_dsi(tc);
+
+	return 0;
+}
+
+static const struct drm_bridge_funcs tc_bridge_funcs = {
+	.attach = tc_bridge_attach,
+	.pre_enable = tc_bridge_pre_enable,
+	.enable = tc_bridge_enable,
+	.disable = tc_bridge_disable,
+	.post_disable = tc_bridge_post_disable,
+};
+
+static const struct regmap_config tc_regmap_config = {
+	.name = "tc358775",
+	.reg_bits = 16,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = 0x05A8,
+	.cache_type = REGCACHE_RBTREE,
+	.reg_format_endian = REGMAP_ENDIAN_BIG,
+	.val_format_endian = REGMAP_ENDIAN_LITTLE,
+};
+
+static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct tc_data *tc;
+	int ret;
+	unsigned int i;
+
+	tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
+	if (!tc)
+		return -ENOMEM;
+
+	tc->dev = dev;
+	tc->i2c = client;
+	tc->status = connector_status_connected;
+
+	/* port@1 is the output port */
+	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
+	if (ret && ret != -ENODEV)
+		return ret;
+
+	ret = tc358775_parse_dt(dev->of_node, tc);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
+		tc->supplies[i].supply = regulator_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
+				      tc->supplies);
+	if (ret < 0)
+		dev_err(dev, "failed to init regulator, ret=%d\n", ret);
+
+	tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
+	if (IS_ERR(tc->stby_gpio)) {
+		ret = PTR_ERR(tc->stby_gpio);
+		dev_err(dev, "cannot get stby-gpio %d\n", ret);
+		return ret;
+	}
+
+	tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(tc->reset_gpio)) {
+		ret = PTR_ERR(tc->reset_gpio);
+		dev_err(dev, "cannot get reset-gpios %d\n", ret);
+		return ret;
+	}
+
+	tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
+	if (IS_ERR(tc->regmap)) {
+		ret = PTR_ERR(tc->regmap);
+		dev_err(dev, "Failed to initialize regmap: %d\n", ret);
+		return ret;
+	}
+
+	tc->bridge.funcs = &tc_bridge_funcs;
+	tc->bridge.of_node = dev->of_node;
+	drm_bridge_add(&tc->bridge);
+
+	i2c_set_clientdata(client, tc);
+
+	return 0;
+}
+
+static int tc_remove(struct i2c_client *client)
+{
+	struct tc_data *tc = i2c_get_clientdata(client);
+
+	drm_bridge_remove(&tc->bridge);
+
+	return 0;
+}
+
+static const struct i2c_device_id tc358775_i2c_ids[] = {
+	{ "tc358775", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
+
+static const struct of_device_id tc358775_of_ids[] = {
+	{ .compatible = "toshiba,tc358775", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, tc358775_of_ids);
+
+static struct i2c_driver tc358775_driver = {
+	.driver = {
+		.name = "tc358775",
+		.of_match_table = tc358775_of_ids,
+	},
+	.id_table = tc358775_i2c_ids,
+	.probe = tc_probe,
+	.remove	= tc_remove,
+};
+module_i2c_driver(tc358775_driver);
+
+MODULE_AUTHOR("Vinay Simha BN <vinaysimha@inforcecomputing.com>");
+MODULE_DESCRIPTION("tc358775 LVDS encoder driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH] display/bridge: dsi2lvds tc358775 driver
  2020-02-27 14:03 ` [PATCH] display/bridge: dsi2lvds tc358775 driver Vinay Simha BN
@ 2020-03-03 15:09   ` Andrzej Hajda
  2020-03-06 12:36     ` Vinay Simha B N
  0 siblings, 1 reply; 8+ messages in thread
From: Andrzej Hajda @ 2020-03-03 15:09 UTC (permalink / raw)
  To: Vinay Simha BN
  Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	Jernej Skrabec, Neil Armstrong, David Airlie, Jonas Karlman,
	open list, open list:DRM DRIVERS, Rob Herring, Laurent Pinchart

On 27.02.2020 15:03, Vinay Simha BN wrote:
> dsi2lvds tc358775 bridge driver added
> Tested in apq8016, ifc6309 board and panel
> auo,b101xtn01


Just FYI, there exists already TC358764/5 driver for similar hw, but
controlled via DSI bus.


> Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
> ---
>  .../bindings/display/bridge/toshiba,tc358775.txt   | 106 ++++


Bindings should be in separate patch and in yaml format.


>  drivers/gpu/drm/bridge/Kconfig                     |  10 +
>  drivers/gpu/drm/bridge/Makefile                    |   1 +
>  drivers/gpu/drm/bridge/tc358775.c                  | 687 +++++++++++++++++++++
>  4 files changed, 804 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
>  create mode 100644 drivers/gpu/drm/bridge/tc358775.c
>
> diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> new file mode 100644
> index 0000000..c4c364d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> @@ -0,0 +1,106 @@
> +Toshiba TC358775 DSI to LVDS bridge bindings
> +
> +Required properties:
> + - compatible: "toshiba,tc358775"
> + - reg: i2c address of the bridge, 0x0f
> + - tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
> +  be one of 1, 2, 3 or 4.
> + - tc, dual-link : To configure the LVDS transmitter either
> +  as single-link or dual-link.
> + - tc, data-format: To configure the data formats
> +   0 for VESA standard, 1 for JEIDA standard


IMO, three properties above should be received from downstream device in
runtime, not hardcoded into DT, however I am not sure if frameworks
support it.

> + - vdd-supply: 1.2V LVDS Power Supply
> + - vddio-supply: 1.8V IO Power Supply
> + - stby-gpios: Standby pin, Low active 
> + - reset-gpios: Hardware reset,	Low active 
> +
> +Required nodes:
> +
> +The TC358775 has two ports. Their connections are modelled using the OF
> +graph bindings specified in Documentation/devicetree/bindings/graph.txt.
> +
> +- Video port 0 for the DSI input. The remote endpoint phandle should be a
> +	reference to a valid mipi_dsi_host device node.
> +- Video port 1 for the LVDS output.
> +
> +Example:
> +
> +	i2c@78b8000 {
> +		/* On High speed expansion */
> +		label = "HS-I2C2";
> +		status = "okay";
> +
> +		tc_bridge: bridge@f {
> +			status = "okay";
> +
> +			compatible = "toshiba,tc358775";
> +			reg = <0x0f>;
> +
> +			tc,dsi-lanes = <4>;
> +			tc,dual-link = <0>;
> +			tc,data-format = <1>;
> +
> +			vdd-supply = <&pm8916_l2>;
> +			vddio-supply = <&pm8916_l6>;
> +
> +			stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
> +			reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +
> +				port@0 {
> +					reg = <0>;
> +					d2l_in: endpoint {
> +						remote-endpoint = <&dsi0_out>;
> +					};
> +				};
> +
> +				port@1 {
> +					reg = <1>;
> +					d2l_out: endpoint {
> +						remote-endpoint = <&panel_in>;
> +					};
> +				};
> +			};
> +		};
> +	};
> +
> +	panel: auo,b101xtn01 {
> +			status = "okay";
> +			compatible = "auo,b101xtn01";
> +			power-supply = <&pm8916_l14>;
> +
> +			port {
> +				panel_in: endpoint {
> +					remote-endpoint = <&d2l_out>;
> +				};
> +			};
> +	};
> +
> +	mdss@1a00000 {
> +		status = "okay";
> +
> +		mdp@1a01000 {
> +			status = "okay";
> +		};
> +
> +		dsi@1a98000 {
> +			status = "okay";
> +			..
> +			ports {
> +				port@1 {
> +					dsi0_out: endpoint {
> +						remote-endpoint = <&d2l_in>;
> +						data-lanes = <0 1 2 3>;
> +					};
> +				};
> +			};
> +		};
> +
> +		dsi-phy@1a98300 {
> +			status = "okay";
> +			..
> +		};
> +	};
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 8397bf7..d5528fa 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
>  	---help---
>  	  Toshiba TC358767 eDP bridge chip driver.
>  
> +config DRM_TOSHIBA_TC358775
> +        tristate "Toshiba TC358775 LVDS bridge"
> +        depends on OF
> +        select DRM_KMS_HELPER
> +        select REGMAP_I2C
> +        select DRM_PANEL
> +	select DRM_MIPI_DSI
> +        ---help---
> +          Toshiba TC358775 LVDS bridge chip driver.
> +
>  config DRM_TI_TFP410
>  	tristate "TI TFP410 DVI/HDMI bridge"
>  	depends on OF
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 1eb5376..9b2c512 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
>  obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
>  obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
>  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
>  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
>  obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
>  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> new file mode 100644
> index 0000000..3db0f49
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/tc358775.c
> @@ -0,0 +1,687 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * tc358775 DSI to LVDS bridge driver
> + *
> + * Copyright (C) 2020 InforceComputing
> + * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.


You can drop these statements, SPDX identifier is enough.


> + */
> +
> +/* #define DEBUG */
> +/* #define TC358775_DEBUG */


Please remove these development leftovers.


> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/regulator/consumer.h>
Alphabetic order.
> +
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_dp_helper.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_probe_helper.h>
ditto
> +
> +/* Registers */
> +
> +/* DSI D-PHY Layer Registers */
> +#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
> +#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
> +#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
> +#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
> +#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
> +#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
> +#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
> +#define CLW_CNTRL       0x0040  /* Clock Lane Control */
> +#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
> +#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
> +#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
> +#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
> +#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
> +
> +/* DSI PPI Layer Registers */
> +#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
> +#define PPI_BUSYPPI     0x0108
> +#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
> +#define PPI_LPTXTIMECNT 0x0114
> +#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
> +#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
> +
> +/* Analog timer function enable */
> +#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
> +#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
> +#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
> +#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
> +#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
> +#define PPI_D0S_CLRSIPOCOUNT    0x0164
> +
> +#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
> +#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
> +#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
> +
> +#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
> +#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
> +#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
> +#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
> +#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
> +#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
> +#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
> +#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
> +#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
> +#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
> +#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
> +#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
> +#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
> +#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
> +#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
> +
> +#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
> +#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
> +#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
> +#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
> +#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
> +#define DSI_BUSYDSI     0x0208
> +#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
> +#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
> +#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
> +
> +#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
> +#define DSI_INTMASK     0x0224  /* Interrupt Mask */
> +#define DSI_INTCLR      0x0228  /* Interrupt Clear */
> +#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
> +
> +#define DSIERRCNT       0x0300  /* DSI Error Count */
> +#define APLCTRL         0x0400  /* Application Layer Control */
> +#define RDPKTLN         0x0404  /* Command Read Packet Length */
> +
> +#define VPCTRL          0x0450  /* Video Path Control */
> +#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
> +#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
> +#define VTIM1           0x045C  /* Vertical Timing Control 1 */
> +#define VTIM2           0x0460  /* Vertical Timing Control 2 */
> +#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
> +
> +/* Mux Input Select for LVDS LINK Input */
> +#define LVMX0003        0x0480  /* Bit 0 to 3 */
> +#define LVMX0407        0x0484  /* Bit 4 to 7 */
> +#define LVMX0811        0x0488  /* Bit 8 to 11 */
> +#define LVMX1215        0x048C  /* Bit 12 to 15 */
> +#define LVMX1619        0x0490  /* Bit 16 to 19 */
> +#define LVMX2023        0x0494  /* Bit 20 to 23 */
> +#define LVMX2427        0x0498  /* Bit 24 to 27 */
> +
> +#define LVCFG           0x049C  /* LVDS Configuration  */
> +#define LVPHY0          0x04A0  /* LVDS PHY 0 */
> +#define LVPHY1          0x04A4  /* LVDS PHY 1 */
> +#define SYSSTAT         0x0500  /* System Status  */
> +#define SYSRST          0x0504  /* System Reset  */
> +/* GPIO Registers */
> +#define GPIOC           0x0520  /* GPIO Control  */
> +#define GPIOO           0x0524  /* GPIO Output  */
> +#define GPIOI           0x0528  /* GPIO Input  */
> +
> +/* I2C Registers */
> +#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
> +#define I2CMADDR        0x0544  /* I2C Master Addressing */
> +#define WDATAQ          0x0548  /* Write Data Queue */
> +#define RDATAQ          0x054C  /* Read Data Queue */
> +
> +/* Chip ID and Revision ID Register */
> +#define IDREG           0x0580
> +
> +#define TC358775XBG_ID  0x00007500
> +
> +/* Debug Registers */
> +#define DEBUG00         0x05A0  /* Debug */
> +#define DEBUG01         0x05A4  /* LVDS Data */
> +
> +#define DSI_CLEN_BIT		BIT(0)
> +#define DIVIDE_BY_3		3 /* PCLK=DCLK/3 */
> +#define LVCFG_LVEN_BIT		BIT(0)
> +
> +#define L0EN BIT(1)
> +
> +#define TC358775_VPCTRL_VSDELAY__MASK	0x3FF00000
> +#define TC358775_VPCTRL_VSDELAY__SHIFT	20
> +static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)


Use u32 here and below, unit32_t is mainly for userspace interactions.


> +{
> +	return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
> +			TC358775_VPCTRL_VSDELAY__MASK;
> +}
> +
> +#define TC358775_VPCTRL_OPXLFMT__MASK	0x00000100
> +#define TC358775_VPCTRL_OPXLFMT__SHIFT	8
> +static inline uint32_t TC358775_VPCTRL_OPXLFMT(uint32_t val)
> +{
> +	return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
> +			TC358775_VPCTRL_OPXLFMT__MASK;
> +}
> +
> +#define TC358775_VPCTRL_MSF__MASK	0x00000001
> +#define TC358775_VPCTRL_MSF__SHIFT	0
> +static inline uint32_t TC358775_VPCTRL_MSF(uint32_t val)
> +{
> +	return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
> +			TC358775_VPCTRL_MSF__MASK;
> +}
> +
> +#define TC358775_LVCFG_PCLKDIV__MASK	0x000000f0
> +#define TC358775_LVCFG_PCLKDIV__SHIFT	4
> +static inline uint32_t TC358775_LVCFG_PCLKDIV(uint32_t val)
> +{
> +	return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
> +			TC358775_LVCFG_PCLKDIV__MASK;
> +}
> +
> +#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
> +#define TC358775_LVCFG_LVDLINK__SHIFT                        0
> +static inline uint32_t TC358775_LVCFG_LVDLINK(uint32_t val)
> +{
> +	return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
> +			TC358775_LVCFG_LVDLINK__MASK;
> +}
> +
> +static const struct reg_sequence tc_fixed_registers[] = {
> +	{ 0x013C, 0x00040006 },
> +	{ 0x0114, 0x00000004 },
> +	{ 0x0164, 0x00000003 },
> +	{ 0x0168, 0x00000003 },
> +	{ 0x016C, 0x00000003 },
> +	{ 0x0170, 0x00000003 },


use macros instead of magic numbers.


> +};
> +
> +static const struct reg_sequence tc_vesa_data_format_registers[] = {
> +	{ 0x0480, 0x03020100 },
> +	{ 0x0484, 0x08050704 },
> +	{ 0x0488, 0x0F0E0A09 },
> +	{ 0x048C, 0x100D0C0B },
> +	{ 0x0490, 0x12111716 },
> +	{ 0x0494, 0x1B151413 },
> +	{ 0x0498, 0x061A1918 },
ditto
> +};
> +
> +static const char * const regulator_names[] = {
> +	"vdd",
> +	"vddio"
> +};
> +
> +struct tc_data {
> +	struct i2c_client	*i2c;
> +
> +	struct device		*dev;
> +	struct regmap		*regmap;
> +
> +	struct drm_bridge	bridge;
> +	struct drm_connector	connector;
> +	struct drm_panel	*panel;
> +
> +	enum drm_connector_status status;
unused field
> +	struct device_node *host_node;
> +	struct mipi_dsi_device *dsi;
> +	u8 num_dsi_lanes;
> +
> +	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> +	struct gpio_desc	*reset_gpio;
> +	struct gpio_desc	*stby_gpio;
> +	u32                     rev;
> +	u8                      dual_link; /* single-link or dual-link */
> +	u8			data_format; /* VESA or JEIDA */
> +};
> +
> +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> +{
> +	return container_of(b, struct tc_data, bridge);
> +}
> +
> +static inline struct tc_data *connector_to_tc(struct drm_connector *c)
> +{
> +	return container_of(c, struct tc_data, connector);
> +}
> +
> +static void tc_bridge_pre_enable(struct drm_bridge *bridge)
> +{
> +	struct tc_data *tc = bridge_to_tc(bridge);
> +	struct device *dev = &tc->dsi->dev;
> +	int ret;
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "regulator enable failed, %d\n", ret);
> +		return;
> +	}
> +	mdelay(10);
> +
> +	gpiod_set_value(tc->stby_gpio, 0);
> +	mdelay(10);
> +
> +	gpiod_set_value(tc->reset_gpio, 0);
> +	ndelay(50);
> +
> +	drm_panel_prepare(tc->panel);
> +}
> +
> +static void tc_bridge_disable(struct drm_bridge *bridge)
> +{
> +	struct tc_data *tc = bridge_to_tc(bridge);
> +	struct device *dev = &tc->dsi->dev;
> +	int ret;
> +
> +	ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
> +	if (ret < 0)
> +		dev_err(dev, "regulator disable failed, %d\n", ret);
> +	mdelay(10);
> +
> +	gpiod_set_value(tc->stby_gpio, 1);
> +	mdelay(10);
> +
> +	gpiod_set_value(tc->reset_gpio, 1);
> +	ndelay(50);
> +
> +	drm_panel_disable(tc->panel);

I suspect the order should be different - ie reverse to the one pre_enable.

Moreover since it reverts pre_enable it should be put into post_disable
(except drm_panel_disable).

> +}
> +
> +static void tc_bridge_post_disable(struct drm_bridge *bridge)
> +{
> +	struct tc_data *tc = bridge_to_tc(bridge);
> +
> +	drm_panel_unprepare(tc->panel);
> +}
> +
> +#ifdef TC358775_DEBUG
> +static u32 d2l_read(struct tc_data *tc, u16 reg)
> +{
> +	int ret;
> +	u32 data;
> +
> +	ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
> +	if (ret)
> +		return ret;
> +
> +	pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
> +
> +	return data;
> +}
> +#endif


I guess this leftover can be removed as well.


> +
> +static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
> +{
> +	int ret = 0;
> +
> +	ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
> +
> +#ifdef TC358775_DEBUG
> +	d2l_read(tc, reg);
> +#endif
> +	return ret;
> +}
> +
> +static void tc_bridge_enable(struct drm_bridge *bridge)
> +{
> +	struct tc_data *tc = bridge_to_tc(bridge);
> +	int ret;
> +	u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
> +	u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
> +	u32 val = 0;
> +	struct drm_display_mode *mode;
> +
> +	mode = &bridge->encoder->crtc->state->adjusted_mode;
> +
> +	hbpr = 0;
> +	hpw  = mode->hsync_end - mode->hsync_start;
> +	vbpr = 0;
> +	vpw  = mode->vsync_end - mode->vsync_start;
> +
> +	htime1 = (hbpr << 16) + hpw;
> +	vtime1 = (vbpr << 16) + vpw;
> +
> +	hfpr = mode->hsync_start - mode->hdisplay;
> +	hsize = mode->hdisplay;
> +	vfpr = mode->vsync_start - mode->vdisplay;
> +	vsize = mode->vdisplay;
> +
> +	htime2 = (hfpr << 16) + hsize;
> +	vtime2 = (vfpr << 16) + vsize;
> +
> +	ret = regmap_read(tc->regmap, IDREG, &tc->rev);
> +	if (ret) {
> +		dev_err(tc->dev, "can not read device ID: %d\n", ret);
> +		return;
> +	}
> +	pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
> +
> +	d2l_write(tc, SYSRST, 0x000000FF);
> +	mdelay(30);
> +
> +	ret = regmap_register_patch(tc->regmap,
> +				    tc_fixed_registers,
> +				    ARRAY_SIZE(tc_fixed_registers));
> +	if (ret)
> +		return;
> +
> +	val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
> +	d2l_write(tc, PPI_LANEENABLE, val);
> +	d2l_write(tc, DSI_LANEENABLE, val);
> +
> +	d2l_write(tc, PPI_STARTPPI, 0x00000001);
> +	d2l_write(tc, DSI_STARTDSI, 0x00000001);
> +
> +	val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
> +
> +	if (tc->connector.display_info.bpc == 8) {/* RGB888 */
> +		val |= TC358775_VPCTRL_OPXLFMT(1);
> +		d2l_write(tc, VPCTRL, val);
> +	} else {				/* RGB666 */
> +		val |= TC358775_VPCTRL_MSF(1);
> +		d2l_write(tc, VPCTRL, val);
> +	}
> +
> +	d2l_write(tc, HTIM1, htime1);
> +	d2l_write(tc, VTIM1, vtime1);
> +	d2l_write(tc, HTIM2, htime2);
> +	d2l_write(tc, VTIM2, vtime2);
> +
> +	d2l_write(tc, VFUEN, 0x00000001);
> +	d2l_write(tc, SYSRST, 0x00000004);
> +	d2l_write(tc, LVPHY0, 0x00040006);
> +
> +	if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */
> +		ret = regmap_register_patch
> +			(tc->regmap,
> +			 tc_vesa_data_format_registers,
> +			 ARRAY_SIZE(tc_vesa_data_format_registers));
> +		if (ret)
> +			return;
> +	}
> +
> +	d2l_write(tc, VFUEN, 0x00000001);
> +
> +	val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
> +	if (tc->dual_link)
> +		val |= TC358775_LVCFG_LVDLINK(1);
> +
> +	d2l_write(tc, LVCFG, val);
> +
> +	drm_panel_enable(tc->panel);
> +}
> +
> +static int tc_connector_get_modes(struct drm_connector *connector)
> +{
> +	struct tc_data *tc = connector_to_tc(connector);
> +	struct edid *edid;
> +	unsigned int count;
> +
> +	if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
> +		count = tc->panel->funcs->get_modes(tc->panel, connector);
> +		if (count > 0)
> +			return count;
> +	}
> +
> +	edid = drm_get_edid(connector, tc->i2c->adapter);
> +	if (!edid)
> +		return 0;
> +
> +	drm_connector_update_edid_property(connector, edid);
> +	count = drm_add_edid_modes(connector, edid);
> +	kfree(edid);
> +
> +	return count;
> +}
> +
> +static int tc_connector_mode_valid(struct drm_connector *connector,
> +				   struct drm_display_mode *mode)
> +{
> +	struct tc_data *tc = connector_to_tc(connector);
> +
> +	/* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
> +	if ((mode->clock > 135000 && tc->dual_link == 0) ||
> +	    (mode->clock > 270000 && tc->dual_link == 1))
> +		return MODE_CLOCK_HIGH;
> +
> +	return MODE_OK;
> +}
> +
> +static struct drm_encoder *
> +tc_connector_best_encoder(struct drm_connector *connector)
> +{
> +	struct tc_data *tc = connector_to_tc(connector);
> +
> +	return tc->bridge.encoder;
> +}
> +
> +static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
> +	.get_modes = tc_connector_get_modes,
> +	.mode_valid = tc_connector_mode_valid,
> +	.best_encoder = tc_connector_best_encoder,
> +};
> +
> +static const struct drm_connector_funcs tc_connector_funcs = {
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.destroy = drm_connector_cleanup,
> +	.reset = drm_atomic_helper_connector_reset,
> +	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> +	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> +{
> +	u32 num_lanes;
> +	u8 dual_link, data_format;
> +
> +	of_property_read_u8(np, "tc,dual-link", &dual_link);
> +	of_property_read_u8(np, "tc,data-format", &data_format);
> +	of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
> +
> +	if (num_lanes < 1 || num_lanes > 4)
> +		return -EINVAL;
> +
> +	tc->num_dsi_lanes = num_lanes;
> +	tc->dual_link = dual_link;
> +	tc->data_format = data_format;
> +
> +	tc->host_node = of_graph_get_remote_node(np, 0, 0);
> +	if (!tc->host_node)
> +		return -ENODEV;
> +
> +	of_node_put(tc->host_node);
> +
> +	return 0;
> +}
> +
> +int tc358775_attach_dsi(struct tc_data *tc)
> +{
> +	struct device *dev = &tc->i2c->dev;
> +	struct mipi_dsi_host *host;
> +	struct mipi_dsi_device *dsi;
> +	int ret = 0;
> +	const struct mipi_dsi_device_info info = { .type = "tc358775",
> +							.channel = 0,
> +							.node = NULL,
> +						};
> +
> +	host = of_find_mipi_dsi_host_by_node(tc->host_node);
> +	if (!host) {
> +		dev_err(dev, "failed to find dsi host\n");
> +		return -EPROBE_DEFER;
> +	}
> +
> +	dsi = mipi_dsi_device_register_full(host, &info);
> +	if (IS_ERR(dsi)) {
> +		dev_err(dev, "failed to create dsi device\n");
> +		ret = PTR_ERR(dsi);
> +		goto err_dsi_device;
> +	}
> +
> +	tc->dsi = dsi;
> +
> +	dsi->lanes = tc->num_dsi_lanes;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to attach dsi to host\n");
> +		goto err_dsi_attach;
> +	}
> +
> +	return 0;
> +
> +err_dsi_attach:
> +	mipi_dsi_device_unregister(dsi);
> +err_dsi_device:
> +	return ret;
> +}
> +
> +static int tc_bridge_attach(struct drm_bridge *bridge)
> +{
> +	struct tc_data *tc = bridge_to_tc(bridge);
> +	struct drm_device *drm = bridge->dev;
> +	int ret;
> +
> +	/* Create LVDS connector */
> +	drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
> +	ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
> +				 DRM_MODE_CONNECTOR_LVDS);
> +	if (ret)
> +		return ret;
> +
> +	if (tc->panel)
> +		drm_panel_attach(tc->panel, &tc->connector);
> +
> +	drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
> +
> +	ret = tc358775_attach_dsi(tc);


Ignored retval.


> +
> +	return 0;
> +}
> +
> +static const struct drm_bridge_funcs tc_bridge_funcs = {
> +	.attach = tc_bridge_attach,
> +	.pre_enable = tc_bridge_pre_enable,
> +	.enable = tc_bridge_enable,
> +	.disable = tc_bridge_disable,
> +	.post_disable = tc_bridge_post_disable,
> +};
> +
> +static const struct regmap_config tc_regmap_config = {
> +	.name = "tc358775",
> +	.reg_bits = 16,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +	.max_register = 0x05A8,
> +	.cache_type = REGCACHE_RBTREE,
> +	.reg_format_endian = REGMAP_ENDIAN_BIG,
> +	.val_format_endian = REGMAP_ENDIAN_LITTLE,
> +};
> +
> +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
> +{
> +	struct device *dev = &client->dev;
> +	struct tc_data *tc;
> +	int ret;
> +	unsigned int i;
> +
> +	tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> +	if (!tc)
> +		return -ENOMEM;
> +
> +	tc->dev = dev;
> +	tc->i2c = client;
> +	tc->status = connector_status_connected;
> +
> +	/* port@1 is the output port */
> +	ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
> +	if (ret && ret != -ENODEV)
> +		return ret;
> +
> +	ret = tc358775_parse_dt(dev->of_node, tc);
> +	if (ret)
> +		return ret;
> +
> +	for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
> +		tc->supplies[i].supply = regulator_names[i];
> +
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
> +				      tc->supplies);
> +	if (ret < 0)
> +		dev_err(dev, "failed to init regulator, ret=%d\n", ret);
> +
> +	tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> +	if (IS_ERR(tc->stby_gpio)) {
> +		ret = PTR_ERR(tc->stby_gpio);
> +		dev_err(dev, "cannot get stby-gpio %d\n", ret);
> +		return ret;
> +	}
> +
> +	tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(tc->reset_gpio)) {
> +		ret = PTR_ERR(tc->reset_gpio);
> +		dev_err(dev, "cannot get reset-gpios %d\n", ret);
> +		return ret;
> +	}
> +
> +	tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
> +	if (IS_ERR(tc->regmap)) {
> +		ret = PTR_ERR(tc->regmap);
> +		dev_err(dev, "Failed to initialize regmap: %d\n", ret);
> +		return ret;
> +	}
> +
> +	tc->bridge.funcs = &tc_bridge_funcs;
> +	tc->bridge.of_node = dev->of_node;
> +	drm_bridge_add(&tc->bridge);
> +
> +	i2c_set_clientdata(client, tc);
> +
> +	return 0;
> +}
> +
> +static int tc_remove(struct i2c_client *client)
> +{
> +	struct tc_data *tc = i2c_get_clientdata(client);
> +
> +	drm_bridge_remove(&tc->bridge);
> +
> +	return 0;
> +}
> +
> +static const struct i2c_device_id tc358775_i2c_ids[] = {
> +	{ "tc358775", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
> +
> +static const struct of_device_id tc358775_of_ids[] = {
> +	{ .compatible = "toshiba,tc358775", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, tc358775_of_ids);
> +
> +static struct i2c_driver tc358775_driver = {
> +	.driver = {
> +		.name = "tc358775",
> +		.of_match_table = tc358775_of_ids,
> +	},
> +	.id_table = tc358775_i2c_ids,
> +	.probe = tc_probe,
> +	.remove	= tc_remove,
> +};
> +module_i2c_driver(tc358775_driver);
> +
> +MODULE_AUTHOR("Vinay Simha BN <vinaysimha@inforcecomputing.com>");
> +MODULE_DESCRIPTION("tc358775 LVDS encoder driver");


maybe  better:

tc358775 DSI/LVDS bridge driver


Regards
Andrzej

> +MODULE_LICENSE("GPL v2");



^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH] display/bridge: dsi2lvds tc358775 driver
  2020-03-03 15:09   ` Andrzej Hajda
@ 2020-03-06 12:36     ` Vinay Simha B N
  2020-03-06 13:32       ` Laurent Pinchart
  0 siblings, 1 reply; 8+ messages in thread
From: Vinay Simha B N @ 2020-03-06 12:36 UTC (permalink / raw)
  To: Andrzej Hajda
  Cc: open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	Jernej Skrabec, Neil Armstrong, David Airlie, Jonas Karlman,
	open list, open list:DRM DRIVERS, Rob Herring, Laurent Pinchart,
	m.purski

hi andrzej,

I had a doubt In the tc358764 driver,VP_CTRL, VP_CTRL_VSDELAY(15) is
hardcoded to 15, but this has to be dynamic based on the resolution of
panel used?

Please see the reply inline.

On Tue, Mar 3, 2020 at 8:39 PM Andrzej Hajda <a.hajda@samsung.com> wrote:
>
> On 27.02.2020 15:03, Vinay Simha BN wrote:
> > dsi2lvds tc358775 bridge driver added
> > Tested in apq8016, ifc6309 board and panel
> > auo,b101xtn01
>
>
> Just FYI, there exists already TC358764/5 driver for similar hw, but
> controlled via DSI bus.
There is not much difference between these two chips, but still the
dsi read access for 775 does not works.
TC358764/5 - 800Mbps per lane, 3.2Gbps
TC358775 - 1Gbps per lane, 4Gbps.

tc358775 chip details -
https://download.t-firefly.com/product/RK3399/Docs/Chip%20Specifications/TC358774XBG_75XBG_V1%204nm.pdf
I am able to configure the tc358775 chip by i2c, but from dsi it fails
i tried accessing the tc358775 chip by dsi using apq8016-qcom , but it
fails to read the chip id itself.

Please suggest if you any inputs for this issue.

https://github.com/vinaysimhabn/kernel-msm/commits/5.6.0-rc3-dsi2lvds-dsi

[    4.582405] tc358764 1a98000.dsi.0: read: 1408, addr: 0
[    4.582426] tc358764 1a98000.dsi.0: ID: 0x0
[    4.582451] tc358764 1a98000.dsi.0: error initializing bridge (-22)

[    4.796220] dsi_cmds2buf_tx: cmd dma tx failed, type=0x24, data0=0x80, len=4
[    4.796244] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
[    4.796266] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
[    4.796288] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
[    4.796310] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
[    4.796319] msm_dsi_host_cmd_rx:Invalid response cmd

>
>
> > Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
> > ---
> >  .../bindings/display/bridge/toshiba,tc358775.txt   | 106 ++++
>
>
> Bindings should be in separate patch and in yaml format.
>
>
> >  drivers/gpu/drm/bridge/Kconfig                     |  10 +
> >  drivers/gpu/drm/bridge/Makefile                    |   1 +
> >  drivers/gpu/drm/bridge/tc358775.c                  | 687 +++++++++++++++++++++
> >  4 files changed, 804 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> >  create mode 100644 drivers/gpu/drm/bridge/tc358775.c
> >
> > diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > new file mode 100644
> > index 0000000..c4c364d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > @@ -0,0 +1,106 @@
> > +Toshiba TC358775 DSI to LVDS bridge bindings
> > +
> > +Required properties:
> > + - compatible: "toshiba,tc358775"
> > + - reg: i2c address of the bridge, 0x0f
> > + - tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
> > +  be one of 1, 2, 3 or 4.
> > + - tc, dual-link : To configure the LVDS transmitter either
> > +  as single-link or dual-link.
> > + - tc, data-format: To configure the data formats
> > +   0 for VESA standard, 1 for JEIDA standard
>
>
> IMO, three properties above should be received from downstream device in
> runtime, not hardcoded into DT, however I am not sure if frameworks
> support it.
>
> > + - vdd-supply: 1.2V LVDS Power Supply
> > + - vddio-supply: 1.8V IO Power Supply
> > + - stby-gpios: Standby pin, Low active
> > + - reset-gpios: Hardware reset,      Low active
> > +
> > +Required nodes:
> > +
> > +The TC358775 has two ports. Their connections are modelled using the OF
> > +graph bindings specified in Documentation/devicetree/bindings/graph.txt.
> > +
> > +- Video port 0 for the DSI input. The remote endpoint phandle should be a
> > +     reference to a valid mipi_dsi_host device node.
> > +- Video port 1 for the LVDS output.
> > +
> > +Example:
> > +
> > +     i2c@78b8000 {
> > +             /* On High speed expansion */
> > +             label = "HS-I2C2";
> > +             status = "okay";
> > +
> > +             tc_bridge: bridge@f {
> > +                     status = "okay";
> > +
> > +                     compatible = "toshiba,tc358775";
> > +                     reg = <0x0f>;
> > +
> > +                     tc,dsi-lanes = <4>;
> > +                     tc,dual-link = <0>;
> > +                     tc,data-format = <1>;
> > +
> > +                     vdd-supply = <&pm8916_l2>;
> > +                     vddio-supply = <&pm8916_l6>;
> > +
> > +                     stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
> > +                     reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
> > +
> > +                     ports {
> > +                             #address-cells = <1>;
> > +                             #size-cells = <0>;
> > +
> > +                             port@0 {
> > +                                     reg = <0>;
> > +                                     d2l_in: endpoint {
> > +                                             remote-endpoint = <&dsi0_out>;
> > +                                     };
> > +                             };
> > +
> > +                             port@1 {
> > +                                     reg = <1>;
> > +                                     d2l_out: endpoint {
> > +                                             remote-endpoint = <&panel_in>;
> > +                                     };
> > +                             };
> > +                     };
> > +             };
> > +     };
> > +
> > +     panel: auo,b101xtn01 {
> > +                     status = "okay";
> > +                     compatible = "auo,b101xtn01";
> > +                     power-supply = <&pm8916_l14>;
> > +
> > +                     port {
> > +                             panel_in: endpoint {
> > +                                     remote-endpoint = <&d2l_out>;
> > +                             };
> > +                     };
> > +     };
> > +
> > +     mdss@1a00000 {
> > +             status = "okay";
> > +
> > +             mdp@1a01000 {
> > +                     status = "okay";
> > +             };
> > +
> > +             dsi@1a98000 {
> > +                     status = "okay";
> > +                     ..
> > +                     ports {
> > +                             port@1 {
> > +                                     dsi0_out: endpoint {
> > +                                             remote-endpoint = <&d2l_in>;
> > +                                             data-lanes = <0 1 2 3>;
> > +                                     };
> > +                             };
> > +                     };
> > +             };
> > +
> > +             dsi-phy@1a98300 {
> > +                     status = "okay";
> > +                     ..
> > +             };
> > +     };
> > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > index 8397bf7..d5528fa 100644
> > --- a/drivers/gpu/drm/bridge/Kconfig
> > +++ b/drivers/gpu/drm/bridge/Kconfig
> > @@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
> >       ---help---
> >         Toshiba TC358767 eDP bridge chip driver.
> >
> > +config DRM_TOSHIBA_TC358775
> > +        tristate "Toshiba TC358775 LVDS bridge"
> > +        depends on OF
> > +        select DRM_KMS_HELPER
> > +        select REGMAP_I2C
> > +        select DRM_PANEL
> > +     select DRM_MIPI_DSI
> > +        ---help---
> > +          Toshiba TC358775 LVDS bridge chip driver.
> > +
> >  config DRM_TI_TFP410
> >       tristate "TI TFP410 DVI/HDMI bridge"
> >       depends on OF
> > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> > index 1eb5376..9b2c512 100644
> > --- a/drivers/gpu/drm/bridge/Makefile
> > +++ b/drivers/gpu/drm/bridge/Makefile
> > @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
> >  obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> >  obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
> >  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> > +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
> >  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> >  obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
> >  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> > diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> > new file mode 100644
> > index 0000000..3db0f49
> > --- /dev/null
> > +++ b/drivers/gpu/drm/bridge/tc358775.c
> > @@ -0,0 +1,687 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * tc358775 DSI to LVDS bridge driver
> > + *
> > + * Copyright (C) 2020 InforceComputing
> > + * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
>
>
> You can drop these statements, SPDX identifier is enough.
>
>
> > + */
> > +
> > +/* #define DEBUG */
> > +/* #define TC358775_DEBUG */
>
>
> Please remove these development leftovers.
>
>
> > +#include <linux/clk.h>
> > +#include <linux/device.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/i2c.h>
> > +#include <linux/kernel.h>
> > +#include <linux/module.h>
> > +#include <linux/regmap.h>
> > +#include <linux/slab.h>
> > +#include <linux/regulator/consumer.h>
> Alphabetic order.
> > +
> > +#include <drm/drm_mipi_dsi.h>
> > +#include <drm/drm_atomic_helper.h>
> > +#include <drm/drm_crtc_helper.h>
> > +#include <drm/drm_dp_helper.h>
> > +#include <drm/drm_of.h>
> > +#include <drm/drm_panel.h>
> > +#include <drm/drm_bridge.h>
> > +#include <drm/drm_probe_helper.h>
> ditto
> > +
> > +/* Registers */
> > +
> > +/* DSI D-PHY Layer Registers */
> > +#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
> > +#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
> > +#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
> > +#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
> > +#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
> > +#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
> > +#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
> > +#define CLW_CNTRL       0x0040  /* Clock Lane Control */
> > +#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
> > +#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
> > +#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
> > +#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
> > +#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
> > +
> > +/* DSI PPI Layer Registers */
> > +#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
> > +#define PPI_BUSYPPI     0x0108
> > +#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
> > +#define PPI_LPTXTIMECNT 0x0114
> > +#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
> > +#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
> > +
> > +/* Analog timer function enable */
> > +#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
> > +#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
> > +#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
> > +#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
> > +#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
> > +#define PPI_D0S_CLRSIPOCOUNT    0x0164
> > +
> > +#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
> > +#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
> > +#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
> > +
> > +#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
> > +#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
> > +#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
> > +#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
> > +#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
> > +#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
> > +#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
> > +#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
> > +#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
> > +#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
> > +#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
> > +#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
> > +#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
> > +#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
> > +#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
> > +
> > +#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
> > +#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
> > +#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
> > +#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
> > +#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
> > +#define DSI_BUSYDSI     0x0208
> > +#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
> > +#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
> > +#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
> > +
> > +#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
> > +#define DSI_INTMASK     0x0224  /* Interrupt Mask */
> > +#define DSI_INTCLR      0x0228  /* Interrupt Clear */
> > +#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
> > +
> > +#define DSIERRCNT       0x0300  /* DSI Error Count */
> > +#define APLCTRL         0x0400  /* Application Layer Control */
> > +#define RDPKTLN         0x0404  /* Command Read Packet Length */
> > +
> > +#define VPCTRL          0x0450  /* Video Path Control */
> > +#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
> > +#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
> > +#define VTIM1           0x045C  /* Vertical Timing Control 1 */
> > +#define VTIM2           0x0460  /* Vertical Timing Control 2 */
> > +#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
> > +
> > +/* Mux Input Select for LVDS LINK Input */
> > +#define LVMX0003        0x0480  /* Bit 0 to 3 */
> > +#define LVMX0407        0x0484  /* Bit 4 to 7 */
> > +#define LVMX0811        0x0488  /* Bit 8 to 11 */
> > +#define LVMX1215        0x048C  /* Bit 12 to 15 */
> > +#define LVMX1619        0x0490  /* Bit 16 to 19 */
> > +#define LVMX2023        0x0494  /* Bit 20 to 23 */
> > +#define LVMX2427        0x0498  /* Bit 24 to 27 */
> > +
> > +#define LVCFG           0x049C  /* LVDS Configuration  */
> > +#define LVPHY0          0x04A0  /* LVDS PHY 0 */
> > +#define LVPHY1          0x04A4  /* LVDS PHY 1 */
> > +#define SYSSTAT         0x0500  /* System Status  */
> > +#define SYSRST          0x0504  /* System Reset  */
> > +/* GPIO Registers */
> > +#define GPIOC           0x0520  /* GPIO Control  */
> > +#define GPIOO           0x0524  /* GPIO Output  */
> > +#define GPIOI           0x0528  /* GPIO Input  */
> > +
> > +/* I2C Registers */
> > +#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
> > +#define I2CMADDR        0x0544  /* I2C Master Addressing */
> > +#define WDATAQ          0x0548  /* Write Data Queue */
> > +#define RDATAQ          0x054C  /* Read Data Queue */
> > +
> > +/* Chip ID and Revision ID Register */
> > +#define IDREG           0x0580
> > +
> > +#define TC358775XBG_ID  0x00007500
> > +
> > +/* Debug Registers */
> > +#define DEBUG00         0x05A0  /* Debug */
> > +#define DEBUG01         0x05A4  /* LVDS Data */
> > +
> > +#define DSI_CLEN_BIT         BIT(0)
> > +#define DIVIDE_BY_3          3 /* PCLK=DCLK/3 */
> > +#define LVCFG_LVEN_BIT               BIT(0)
> > +
> > +#define L0EN BIT(1)
> > +
> > +#define TC358775_VPCTRL_VSDELAY__MASK        0x3FF00000
> > +#define TC358775_VPCTRL_VSDELAY__SHIFT       20
> > +static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)
>
>
> Use u32 here and below, unit32_t is mainly for userspace interactions.
>
>
> > +{
> > +     return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
> > +                     TC358775_VPCTRL_VSDELAY__MASK;
> > +}
> > +
> > +#define TC358775_VPCTRL_OPXLFMT__MASK        0x00000100
> > +#define TC358775_VPCTRL_OPXLFMT__SHIFT       8
> > +static inline uint32_t TC358775_VPCTRL_OPXLFMT(uint32_t val)
> > +{
> > +     return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
> > +                     TC358775_VPCTRL_OPXLFMT__MASK;
> > +}
> > +
> > +#define TC358775_VPCTRL_MSF__MASK    0x00000001
> > +#define TC358775_VPCTRL_MSF__SHIFT   0
> > +static inline uint32_t TC358775_VPCTRL_MSF(uint32_t val)
> > +{
> > +     return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
> > +                     TC358775_VPCTRL_MSF__MASK;
> > +}
> > +
> > +#define TC358775_LVCFG_PCLKDIV__MASK 0x000000f0
> > +#define TC358775_LVCFG_PCLKDIV__SHIFT        4
> > +static inline uint32_t TC358775_LVCFG_PCLKDIV(uint32_t val)
> > +{
> > +     return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
> > +                     TC358775_LVCFG_PCLKDIV__MASK;
> > +}
> > +
> > +#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
> > +#define TC358775_LVCFG_LVDLINK__SHIFT                        0
> > +static inline uint32_t TC358775_LVCFG_LVDLINK(uint32_t val)
> > +{
> > +     return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
> > +                     TC358775_LVCFG_LVDLINK__MASK;
> > +}
> > +
> > +static const struct reg_sequence tc_fixed_registers[] = {
> > +     { 0x013C, 0x00040006 },
> > +     { 0x0114, 0x00000004 },
> > +     { 0x0164, 0x00000003 },
> > +     { 0x0168, 0x00000003 },
> > +     { 0x016C, 0x00000003 },
> > +     { 0x0170, 0x00000003 },
>
>
> use macros instead of magic numbers.
>
>
> > +};
> > +
> > +static const struct reg_sequence tc_vesa_data_format_registers[] = {
> > +     { 0x0480, 0x03020100 },
> > +     { 0x0484, 0x08050704 },
> > +     { 0x0488, 0x0F0E0A09 },
> > +     { 0x048C, 0x100D0C0B },
> > +     { 0x0490, 0x12111716 },
> > +     { 0x0494, 0x1B151413 },
> > +     { 0x0498, 0x061A1918 },
> ditto
> > +};
> > +
> > +static const char * const regulator_names[] = {
> > +     "vdd",
> > +     "vddio"
> > +};
> > +
> > +struct tc_data {
> > +     struct i2c_client       *i2c;
> > +
> > +     struct device           *dev;
> > +     struct regmap           *regmap;
> > +
> > +     struct drm_bridge       bridge;
> > +     struct drm_connector    connector;
> > +     struct drm_panel        *panel;
> > +
> > +     enum drm_connector_status status;
> unused field
> > +     struct device_node *host_node;
> > +     struct mipi_dsi_device *dsi;
> > +     u8 num_dsi_lanes;
> > +
> > +     struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> > +     struct gpio_desc        *reset_gpio;
> > +     struct gpio_desc        *stby_gpio;
> > +     u32                     rev;
> > +     u8                      dual_link; /* single-link or dual-link */
> > +     u8                      data_format; /* VESA or JEIDA */
> > +};
> > +
> > +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> > +{
> > +     return container_of(b, struct tc_data, bridge);
> > +}
> > +
> > +static inline struct tc_data *connector_to_tc(struct drm_connector *c)
> > +{
> > +     return container_of(c, struct tc_data, connector);
> > +}
> > +
> > +static void tc_bridge_pre_enable(struct drm_bridge *bridge)
> > +{
> > +     struct tc_data *tc = bridge_to_tc(bridge);
> > +     struct device *dev = &tc->dsi->dev;
> > +     int ret;
> > +
> > +     ret = regulator_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > +     if (ret < 0) {
> > +             dev_err(dev, "regulator enable failed, %d\n", ret);
> > +             return;
> > +     }
> > +     mdelay(10);
> > +
> > +     gpiod_set_value(tc->stby_gpio, 0);
> > +     mdelay(10);
> > +
> > +     gpiod_set_value(tc->reset_gpio, 0);
> > +     ndelay(50);
> > +
> > +     drm_panel_prepare(tc->panel);
> > +}
> > +
> > +static void tc_bridge_disable(struct drm_bridge *bridge)
> > +{
> > +     struct tc_data *tc = bridge_to_tc(bridge);
> > +     struct device *dev = &tc->dsi->dev;
> > +     int ret;
> > +
> > +     ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > +     if (ret < 0)
> > +             dev_err(dev, "regulator disable failed, %d\n", ret);
> > +     mdelay(10);
> > +
> > +     gpiod_set_value(tc->stby_gpio, 1);
> > +     mdelay(10);
> > +
> > +     gpiod_set_value(tc->reset_gpio, 1);
> > +     ndelay(50);
> > +
> > +     drm_panel_disable(tc->panel);
>
> I suspect the order should be different - ie reverse to the one pre_enable.
>
> Moreover since it reverts pre_enable it should be put into post_disable
> (except drm_panel_disable).
>
> > +}
> > +
> > +static void tc_bridge_post_disable(struct drm_bridge *bridge)
> > +{
> > +     struct tc_data *tc = bridge_to_tc(bridge);
> > +
> > +     drm_panel_unprepare(tc->panel);
> > +}
> > +
> > +#ifdef TC358775_DEBUG
> > +static u32 d2l_read(struct tc_data *tc, u16 reg)
> > +{
> > +     int ret;
> > +     u32 data;
> > +
> > +     ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
> > +     if (ret)
> > +             return ret;
> > +
> > +     pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
> > +
> > +     return data;
> > +}
> > +#endif
>
>
> I guess this leftover can be removed as well.
>
>
> > +
> > +static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
> > +{
> > +     int ret = 0;
> > +
> > +     ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
> > +
> > +#ifdef TC358775_DEBUG
> > +     d2l_read(tc, reg);
> > +#endif
> > +     return ret;
> > +}
> > +
> > +static void tc_bridge_enable(struct drm_bridge *bridge)
> > +{
> > +     struct tc_data *tc = bridge_to_tc(bridge);
> > +     int ret;
> > +     u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
> > +     u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
> > +     u32 val = 0;
> > +     struct drm_display_mode *mode;
> > +
> > +     mode = &bridge->encoder->crtc->state->adjusted_mode;
> > +
> > +     hbpr = 0;
> > +     hpw  = mode->hsync_end - mode->hsync_start;
> > +     vbpr = 0;
> > +     vpw  = mode->vsync_end - mode->vsync_start;
> > +
> > +     htime1 = (hbpr << 16) + hpw;
> > +     vtime1 = (vbpr << 16) + vpw;
> > +
> > +     hfpr = mode->hsync_start - mode->hdisplay;
> > +     hsize = mode->hdisplay;
> > +     vfpr = mode->vsync_start - mode->vdisplay;
> > +     vsize = mode->vdisplay;
> > +
> > +     htime2 = (hfpr << 16) + hsize;
> > +     vtime2 = (vfpr << 16) + vsize;
> > +
> > +     ret = regmap_read(tc->regmap, IDREG, &tc->rev);
> > +     if (ret) {
> > +             dev_err(tc->dev, "can not read device ID: %d\n", ret);
> > +             return;
> > +     }
> > +     pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
> > +
> > +     d2l_write(tc, SYSRST, 0x000000FF);
> > +     mdelay(30);
> > +
> > +     ret = regmap_register_patch(tc->regmap,
> > +                                 tc_fixed_registers,
> > +                                 ARRAY_SIZE(tc_fixed_registers));
> > +     if (ret)
> > +             return;
> > +
> > +     val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
> > +     d2l_write(tc, PPI_LANEENABLE, val);
> > +     d2l_write(tc, DSI_LANEENABLE, val);
> > +
> > +     d2l_write(tc, PPI_STARTPPI, 0x00000001);
> > +     d2l_write(tc, DSI_STARTDSI, 0x00000001);
> > +
> > +     val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
Any suggestion how to set dynamic value for Vsyncdelay?
> > +
> > +     if (tc->connector.display_info.bpc == 8) {/* RGB888 */
> > +             val |= TC358775_VPCTRL_OPXLFMT(1);
> > +             d2l_write(tc, VPCTRL, val);
> > +     } else {                                /* RGB666 */
> > +             val |= TC358775_VPCTRL_MSF(1);
> > +             d2l_write(tc, VPCTRL, val);
> > +     }
> > +
> > +     d2l_write(tc, HTIM1, htime1);
> > +     d2l_write(tc, VTIM1, vtime1);
> > +     d2l_write(tc, HTIM2, htime2);
> > +     d2l_write(tc, VTIM2, vtime2);
> > +
> > +     d2l_write(tc, VFUEN, 0x00000001);
> > +     d2l_write(tc, SYSRST, 0x00000004);
> > +     d2l_write(tc, LVPHY0, 0x00040006);
> > +
> > +     if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */
> > +             ret = regmap_register_patch
> > +                     (tc->regmap,
> > +                      tc_vesa_data_format_registers,
> > +                      ARRAY_SIZE(tc_vesa_data_format_registers));
> > +             if (ret)
> > +                     return;
> > +     }
> > +
> > +     d2l_write(tc, VFUEN, 0x00000001);
> > +
> > +     val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
> > +     if (tc->dual_link)
> > +             val |= TC358775_LVCFG_LVDLINK(1);
> > +
> > +     d2l_write(tc, LVCFG, val);
> > +
> > +     drm_panel_enable(tc->panel);
> > +}
> > +
> > +static int tc_connector_get_modes(struct drm_connector *connector)
> > +{
> > +     struct tc_data *tc = connector_to_tc(connector);
> > +     struct edid *edid;
> > +     unsigned int count;
> > +
> > +     if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
> > +             count = tc->panel->funcs->get_modes(tc->panel, connector);
> > +             if (count > 0)
> > +                     return count;
> > +     }
> > +
> > +     edid = drm_get_edid(connector, tc->i2c->adapter);
> > +     if (!edid)
> > +             return 0;
> > +
> > +     drm_connector_update_edid_property(connector, edid);
> > +     count = drm_add_edid_modes(connector, edid);
> > +     kfree(edid);
> > +
> > +     return count;
> > +}
> > +
> > +static int tc_connector_mode_valid(struct drm_connector *connector,
> > +                                struct drm_display_mode *mode)
> > +{
> > +     struct tc_data *tc = connector_to_tc(connector);
> > +
> > +     /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
> > +     if ((mode->clock > 135000 && tc->dual_link == 0) ||
> > +         (mode->clock > 270000 && tc->dual_link == 1))
> > +             return MODE_CLOCK_HIGH;
> > +
> > +     return MODE_OK;
> > +}
> > +
> > +static struct drm_encoder *
> > +tc_connector_best_encoder(struct drm_connector *connector)
> > +{
> > +     struct tc_data *tc = connector_to_tc(connector);
> > +
> > +     return tc->bridge.encoder;
> > +}
> > +
> > +static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
> > +     .get_modes = tc_connector_get_modes,
> > +     .mode_valid = tc_connector_mode_valid,
> > +     .best_encoder = tc_connector_best_encoder,
> > +};
> > +
> > +static const struct drm_connector_funcs tc_connector_funcs = {
> > +     .fill_modes = drm_helper_probe_single_connector_modes,
> > +     .destroy = drm_connector_cleanup,
> > +     .reset = drm_atomic_helper_connector_reset,
> > +     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > +     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > +};
> > +
> > +int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> > +{
> > +     u32 num_lanes;
> > +     u8 dual_link, data_format;
> > +
> > +     of_property_read_u8(np, "tc,dual-link", &dual_link);
> > +     of_property_read_u8(np, "tc,data-format", &data_format);
> > +     of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
> > +
> > +     if (num_lanes < 1 || num_lanes > 4)
> > +             return -EINVAL;
> > +
> > +     tc->num_dsi_lanes = num_lanes;
> > +     tc->dual_link = dual_link;
> > +     tc->data_format = data_format;
> > +
> > +     tc->host_node = of_graph_get_remote_node(np, 0, 0);
> > +     if (!tc->host_node)
> > +             return -ENODEV;
> > +
> > +     of_node_put(tc->host_node);
> > +
> > +     return 0;
> > +}
> > +
> > +int tc358775_attach_dsi(struct tc_data *tc)
> > +{
> > +     struct device *dev = &tc->i2c->dev;
> > +     struct mipi_dsi_host *host;
> > +     struct mipi_dsi_device *dsi;
> > +     int ret = 0;
> > +     const struct mipi_dsi_device_info info = { .type = "tc358775",
> > +                                                     .channel = 0,
> > +                                                     .node = NULL,
> > +                                             };
> > +
> > +     host = of_find_mipi_dsi_host_by_node(tc->host_node);
> > +     if (!host) {
> > +             dev_err(dev, "failed to find dsi host\n");
> > +             return -EPROBE_DEFER;
> > +     }
> > +
> > +     dsi = mipi_dsi_device_register_full(host, &info);
> > +     if (IS_ERR(dsi)) {
> > +             dev_err(dev, "failed to create dsi device\n");
> > +             ret = PTR_ERR(dsi);
> > +             goto err_dsi_device;
> > +     }
> > +
> > +     tc->dsi = dsi;
> > +
> > +     dsi->lanes = tc->num_dsi_lanes;
> > +     dsi->format = MIPI_DSI_FMT_RGB888;
> > +     dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> > +
> > +     ret = mipi_dsi_attach(dsi);
> > +     if (ret < 0) {
> > +             dev_err(dev, "failed to attach dsi to host\n");
> > +             goto err_dsi_attach;
> > +     }
> > +
> > +     return 0;
> > +
> > +err_dsi_attach:
> > +     mipi_dsi_device_unregister(dsi);
> > +err_dsi_device:
> > +     return ret;
> > +}
> > +
> > +static int tc_bridge_attach(struct drm_bridge *bridge)
> > +{
> > +     struct tc_data *tc = bridge_to_tc(bridge);
> > +     struct drm_device *drm = bridge->dev;
> > +     int ret;
> > +
> > +     /* Create LVDS connector */
> > +     drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
> > +     ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
> > +                              DRM_MODE_CONNECTOR_LVDS);
> > +     if (ret)
> > +             return ret;
> > +
> > +     if (tc->panel)
> > +             drm_panel_attach(tc->panel, &tc->connector);
> > +
> > +     drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
> > +
> > +     ret = tc358775_attach_dsi(tc);
>
>
> Ignored retval.
>
>
> > +
> > +     return 0;
> > +}
> > +
> > +static const struct drm_bridge_funcs tc_bridge_funcs = {
> > +     .attach = tc_bridge_attach,
> > +     .pre_enable = tc_bridge_pre_enable,
> > +     .enable = tc_bridge_enable,
> > +     .disable = tc_bridge_disable,
> > +     .post_disable = tc_bridge_post_disable,
> > +};
> > +
> > +static const struct regmap_config tc_regmap_config = {
> > +     .name = "tc358775",
> > +     .reg_bits = 16,
> > +     .val_bits = 32,
> > +     .reg_stride = 4,
> > +     .max_register = 0x05A8,
> > +     .cache_type = REGCACHE_RBTREE,
> > +     .reg_format_endian = REGMAP_ENDIAN_BIG,
> > +     .val_format_endian = REGMAP_ENDIAN_LITTLE,
> > +};
> > +
> > +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
> > +{
> > +     struct device *dev = &client->dev;
> > +     struct tc_data *tc;
> > +     int ret;
> > +     unsigned int i;
> > +
> > +     tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> > +     if (!tc)
> > +             return -ENOMEM;
> > +
> > +     tc->dev = dev;
> > +     tc->i2c = client;
> > +     tc->status = connector_status_connected;
> > +
> > +     /* port@1 is the output port */
> > +     ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
> > +     if (ret && ret != -ENODEV)
> > +             return ret;
> > +
> > +     ret = tc358775_parse_dt(dev->of_node, tc);
> > +     if (ret)
> > +             return ret;
> > +
> > +     for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
> > +             tc->supplies[i].supply = regulator_names[i];
> > +
> > +     ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
> > +                                   tc->supplies);
> > +     if (ret < 0)
> > +             dev_err(dev, "failed to init regulator, ret=%d\n", ret);
> > +
> > +     tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> > +     if (IS_ERR(tc->stby_gpio)) {
> > +             ret = PTR_ERR(tc->stby_gpio);
> > +             dev_err(dev, "cannot get stby-gpio %d\n", ret);
> > +             return ret;
> > +     }
> > +
> > +     tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > +     if (IS_ERR(tc->reset_gpio)) {
> > +             ret = PTR_ERR(tc->reset_gpio);
> > +             dev_err(dev, "cannot get reset-gpios %d\n", ret);
> > +             return ret;
> > +     }
> > +
> > +     tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
> > +     if (IS_ERR(tc->regmap)) {
> > +             ret = PTR_ERR(tc->regmap);
> > +             dev_err(dev, "Failed to initialize regmap: %d\n", ret);
> > +             return ret;
> > +     }
> > +
> > +     tc->bridge.funcs = &tc_bridge_funcs;
> > +     tc->bridge.of_node = dev->of_node;
> > +     drm_bridge_add(&tc->bridge);
> > +
> > +     i2c_set_clientdata(client, tc);
> > +
> > +     return 0;
> > +}
> > +
> > +static int tc_remove(struct i2c_client *client)
> > +{
> > +     struct tc_data *tc = i2c_get_clientdata(client);
> > +
> > +     drm_bridge_remove(&tc->bridge);
> > +
> > +     return 0;
> > +}
> > +
> > +static const struct i2c_device_id tc358775_i2c_ids[] = {
> > +     { "tc358775", 0 },
> > +     { }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
> > +
> > +static const struct of_device_id tc358775_of_ids[] = {
> > +     { .compatible = "toshiba,tc358775", },
> > +     { }
> > +};
> > +MODULE_DEVICE_TABLE(of, tc358775_of_ids);
> > +
> > +static struct i2c_driver tc358775_driver = {
> > +     .driver = {
> > +             .name = "tc358775",
> > +             .of_match_table = tc358775_of_ids,
> > +     },
> > +     .id_table = tc358775_i2c_ids,
> > +     .probe = tc_probe,
> > +     .remove = tc_remove,
> > +};
> > +module_i2c_driver(tc358775_driver);
> > +
> > +MODULE_AUTHOR("Vinay Simha BN <vinaysimha@inforcecomputing.com>");
> > +MODULE_DESCRIPTION("tc358775 LVDS encoder driver");
>
>
> maybe  better:
>
> tc358775 DSI/LVDS bridge driver
>
>
> Regards
> Andrzej
>
> > +MODULE_LICENSE("GPL v2");
>
>


--
regards,
vinaysimha

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH] display/bridge: dsi2lvds tc358775 driver
  2020-03-06 12:36     ` Vinay Simha B N
@ 2020-03-06 13:32       ` Laurent Pinchart
  2020-03-11 10:00         ` Vinay Simha B N
  0 siblings, 1 reply; 8+ messages in thread
From: Laurent Pinchart @ 2020-03-06 13:32 UTC (permalink / raw)
  To: Vinay Simha B N
  Cc: Andrzej Hajda,
	open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	Jernej Skrabec, Neil Armstrong, David Airlie, Jonas Karlman,
	open list, open list:DRM DRIVERS, Rob Herring, m.purski

Hi Vinay,

Thank you for the patch.

On Fri, Mar 06, 2020 at 06:06:36PM +0530, Vinay Simha B N wrote:
> hi andrzej,
> 
> I had a doubt In the tc358764 driver,VP_CTRL, VP_CTRL_VSDELAY(15) is
> hardcoded to 15, but this has to be dynamic based on the resolution of
> panel used?
> 
> Please see the reply inline.
> 
> On Tue, Mar 3, 2020 at 8:39 PM Andrzej Hajda <a.hajda@samsung.com> wrote:
> > On 27.02.2020 15:03, Vinay Simha BN wrote:
> > > dsi2lvds tc358775 bridge driver added
> > > Tested in apq8016, ifc6309 board and panel
> > > auo,b101xtn01
> >
> > Just FYI, there exists already TC358764/5 driver for similar hw, but
> > controlled via DSI bus.
>
> There is not much difference between these two chips, but still the
> dsi read access for 775 does not works.
> TC358764/5 - 800Mbps per lane, 3.2Gbps
> TC358775 - 1Gbps per lane, 4Gbps.
> 
> tc358775 chip details -
> https://download.t-firefly.com/product/RK3399/Docs/Chip%20Specifications/TC358774XBG_75XBG_V1%204nm.pdf
> I am able to configure the tc358775 chip by i2c, but from dsi it fails
> i tried accessing the tc358775 chip by dsi using apq8016-qcom , but it
> fails to read the chip id itself.
> 
> Please suggest if you any inputs for this issue.
> 
> https://github.com/vinaysimhabn/kernel-msm/commits/5.6.0-rc3-dsi2lvds-dsi
> 
> [    4.582405] tc358764 1a98000.dsi.0: read: 1408, addr: 0
> [    4.582426] tc358764 1a98000.dsi.0: ID: 0x0
> [    4.582451] tc358764 1a98000.dsi.0: error initializing bridge (-22)
> 
> [    4.796220] dsi_cmds2buf_tx: cmd dma tx failed, type=0x24, data0=0x80, len=4
> [    4.796244] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> [    4.796266] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> [    4.796288] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> [    4.796310] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> [    4.796319] msm_dsi_host_cmd_rx:Invalid response cmd
> 
> > > Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
> > > ---
> > >  .../bindings/display/bridge/toshiba,tc358775.txt   | 106 ++++
> >
> > Bindings should be in separate patch and in yaml format.
> >
> > >  drivers/gpu/drm/bridge/Kconfig                     |  10 +
> > >  drivers/gpu/drm/bridge/Makefile                    |   1 +
> > >  drivers/gpu/drm/bridge/tc358775.c                  | 687 +++++++++++++++++++++
> > >  4 files changed, 804 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > >  create mode 100644 drivers/gpu/drm/bridge/tc358775.c
> > >
> > > diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > new file mode 100644
> > > index 0000000..c4c364d
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > @@ -0,0 +1,106 @@
> > > +Toshiba TC358775 DSI to LVDS bridge bindings
> > > +
> > > +Required properties:
> > > + - compatible: "toshiba,tc358775"
> > > + - reg: i2c address of the bridge, 0x0f
> > > + - tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
> > > +  be one of 1, 2, 3 or 4.
> > > + - tc, dual-link : To configure the LVDS transmitter either
> > > +  as single-link or dual-link.
> > > + - tc, data-format: To configure the data formats
> > > +   0 for VESA standard, 1 for JEIDA standard
> >
> > IMO, three properties above should be received from downstream device in
> > runtime, not hardcoded into DT, however I am not sure if frameworks
> > support it.

I assume Andrzej meant upstream device for the tc,dsi-lanes property.
This should be exposed through the data-lanes property as described in
media/video-interface.txt.

The tc,dual-link property should be replaced by exposing two port nodes,
one for each link, and connecting them appropriately. See
display/bridge/thine,thc63lvd1024.txt for an example of DT bindings on
the LVDS receiver side, and drivers/gpu/drm/rcar-du/rcar_lvds.c for an
example implementation on the LVDS transmitter side.

The tc,data-format property should be replaced by the data-mapping
property on the downstream LVDS device (see display/panel/lvds.yaml) and
queried at runtime.

> > > + - vdd-supply: 1.2V LVDS Power Supply
> > > + - vddio-supply: 1.8V IO Power Supply
> > > + - stby-gpios: Standby pin, Low active
> > > + - reset-gpios: Hardware reset,      Low active
> > > +
> > > +Required nodes:
> > > +
> > > +The TC358775 has two ports. Their connections are modelled using the OF
> > > +graph bindings specified in Documentation/devicetree/bindings/graph.txt.
> > > +
> > > +- Video port 0 for the DSI input. The remote endpoint phandle should be a
> > > +     reference to a valid mipi_dsi_host device node.
> > > +- Video port 1 for the LVDS output.
> > > +
> > > +Example:
> > > +
> > > +     i2c@78b8000 {
> > > +             /* On High speed expansion */
> > > +             label = "HS-I2C2";
> > > +             status = "okay";
> > > +
> > > +             tc_bridge: bridge@f {
> > > +                     status = "okay";
> > > +
> > > +                     compatible = "toshiba,tc358775";
> > > +                     reg = <0x0f>;
> > > +
> > > +                     tc,dsi-lanes = <4>;
> > > +                     tc,dual-link = <0>;
> > > +                     tc,data-format = <1>;
> > > +
> > > +                     vdd-supply = <&pm8916_l2>;
> > > +                     vddio-supply = <&pm8916_l6>;
> > > +
> > > +                     stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
> > > +                     reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
> > > +
> > > +                     ports {
> > > +                             #address-cells = <1>;
> > > +                             #size-cells = <0>;
> > > +
> > > +                             port@0 {
> > > +                                     reg = <0>;
> > > +                                     d2l_in: endpoint {
> > > +                                             remote-endpoint = <&dsi0_out>;
> > > +                                     };
> > > +                             };
> > > +
> > > +                             port@1 {
> > > +                                     reg = <1>;
> > > +                                     d2l_out: endpoint {
> > > +                                             remote-endpoint = <&panel_in>;
> > > +                                     };
> > > +                             };
> > > +                     };
> > > +             };
> > > +     };
> > > +
> > > +     panel: auo,b101xtn01 {
> > > +                     status = "okay";
> > > +                     compatible = "auo,b101xtn01";
> > > +                     power-supply = <&pm8916_l14>;
> > > +
> > > +                     port {
> > > +                             panel_in: endpoint {
> > > +                                     remote-endpoint = <&d2l_out>;
> > > +                             };
> > > +                     };
> > > +     };
> > > +
> > > +     mdss@1a00000 {
> > > +             status = "okay";
> > > +
> > > +             mdp@1a01000 {
> > > +                     status = "okay";
> > > +             };
> > > +
> > > +             dsi@1a98000 {
> > > +                     status = "okay";
> > > +                     ..
> > > +                     ports {
> > > +                             port@1 {
> > > +                                     dsi0_out: endpoint {
> > > +                                             remote-endpoint = <&d2l_in>;
> > > +                                             data-lanes = <0 1 2 3>;
> > > +                                     };
> > > +                             };
> > > +                     };
> > > +             };
> > > +
> > > +             dsi-phy@1a98300 {
> > > +                     status = "okay";
> > > +                     ..
> > > +             };
> > > +     };
> > > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > > index 8397bf7..d5528fa 100644
> > > --- a/drivers/gpu/drm/bridge/Kconfig
> > > +++ b/drivers/gpu/drm/bridge/Kconfig
> > > @@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
> > >       ---help---
> > >         Toshiba TC358767 eDP bridge chip driver.
> > >
> > > +config DRM_TOSHIBA_TC358775
> > > +        tristate "Toshiba TC358775 LVDS bridge"
> > > +        depends on OF
> > > +        select DRM_KMS_HELPER
> > > +        select REGMAP_I2C
> > > +        select DRM_PANEL
> > > +     select DRM_MIPI_DSI
> > > +        ---help---
> > > +          Toshiba TC358775 LVDS bridge chip driver.
> > > +
> > >  config DRM_TI_TFP410
> > >       tristate "TI TFP410 DVI/HDMI bridge"
> > >       depends on OF
> > > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> > > index 1eb5376..9b2c512 100644
> > > --- a/drivers/gpu/drm/bridge/Makefile
> > > +++ b/drivers/gpu/drm/bridge/Makefile
> > > @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
> > >  obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> > >  obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
> > >  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> > > +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
> > >  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> > >  obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
> > >  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> > > diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> > > new file mode 100644
> > > index 0000000..3db0f49
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/bridge/tc358775.c
> > > @@ -0,0 +1,687 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * tc358775 DSI to LVDS bridge driver
> > > + *
> > > + * Copyright (C) 2020 InforceComputing
> > > + * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
> > > + *
> > > + * This program is free software; you can redistribute it and/or modify
> > > + * it under the terms of the GNU General Public License as published by
> > > + * the Free Software Foundation; either version 2 of the License, or
> > > + * (at your option) any later version.
> > > + *
> > > + * This program is distributed in the hope that it will be useful,
> > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > > + * GNU General Public License for more details.
> >
> > You can drop these statements, SPDX identifier is enough.
> >
> > > + */
> > > +
> > > +/* #define DEBUG */
> > > +/* #define TC358775_DEBUG */
> >
> > Please remove these development leftovers.
> >
> > > +#include <linux/clk.h>
> > > +#include <linux/device.h>
> > > +#include <linux/gpio/consumer.h>
> > > +#include <linux/i2c.h>
> > > +#include <linux/kernel.h>
> > > +#include <linux/module.h>
> > > +#include <linux/regmap.h>
> > > +#include <linux/slab.h>
> > > +#include <linux/regulator/consumer.h>
> > Alphabetic order.
> > > +
> > > +#include <drm/drm_mipi_dsi.h>
> > > +#include <drm/drm_atomic_helper.h>
> > > +#include <drm/drm_crtc_helper.h>
> > > +#include <drm/drm_dp_helper.h>
> > > +#include <drm/drm_of.h>
> > > +#include <drm/drm_panel.h>
> > > +#include <drm/drm_bridge.h>
> > > +#include <drm/drm_probe_helper.h>
> > ditto
> > > +
> > > +/* Registers */
> > > +
> > > +/* DSI D-PHY Layer Registers */
> > > +#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
> > > +#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
> > > +#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
> > > +#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
> > > +#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
> > > +#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
> > > +#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
> > > +#define CLW_CNTRL       0x0040  /* Clock Lane Control */
> > > +#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
> > > +#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
> > > +#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
> > > +#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
> > > +#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
> > > +
> > > +/* DSI PPI Layer Registers */
> > > +#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
> > > +#define PPI_BUSYPPI     0x0108
> > > +#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
> > > +#define PPI_LPTXTIMECNT 0x0114
> > > +#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
> > > +#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
> > > +
> > > +/* Analog timer function enable */
> > > +#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
> > > +#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
> > > +#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
> > > +#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
> > > +#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
> > > +#define PPI_D0S_CLRSIPOCOUNT    0x0164
> > > +
> > > +#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
> > > +#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
> > > +#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
> > > +
> > > +#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
> > > +#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
> > > +#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
> > > +#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
> > > +#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
> > > +#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
> > > +#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
> > > +#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
> > > +#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
> > > +#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
> > > +#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
> > > +#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
> > > +#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
> > > +#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
> > > +#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
> > > +
> > > +#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
> > > +#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
> > > +#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
> > > +#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
> > > +#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
> > > +#define DSI_BUSYDSI     0x0208
> > > +#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
> > > +#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
> > > +#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
> > > +
> > > +#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
> > > +#define DSI_INTMASK     0x0224  /* Interrupt Mask */
> > > +#define DSI_INTCLR      0x0228  /* Interrupt Clear */
> > > +#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
> > > +
> > > +#define DSIERRCNT       0x0300  /* DSI Error Count */
> > > +#define APLCTRL         0x0400  /* Application Layer Control */
> > > +#define RDPKTLN         0x0404  /* Command Read Packet Length */
> > > +
> > > +#define VPCTRL          0x0450  /* Video Path Control */
> > > +#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
> > > +#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
> > > +#define VTIM1           0x045C  /* Vertical Timing Control 1 */
> > > +#define VTIM2           0x0460  /* Vertical Timing Control 2 */
> > > +#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
> > > +
> > > +/* Mux Input Select for LVDS LINK Input */
> > > +#define LVMX0003        0x0480  /* Bit 0 to 3 */
> > > +#define LVMX0407        0x0484  /* Bit 4 to 7 */
> > > +#define LVMX0811        0x0488  /* Bit 8 to 11 */
> > > +#define LVMX1215        0x048C  /* Bit 12 to 15 */
> > > +#define LVMX1619        0x0490  /* Bit 16 to 19 */
> > > +#define LVMX2023        0x0494  /* Bit 20 to 23 */
> > > +#define LVMX2427        0x0498  /* Bit 24 to 27 */
> > > +
> > > +#define LVCFG           0x049C  /* LVDS Configuration  */
> > > +#define LVPHY0          0x04A0  /* LVDS PHY 0 */
> > > +#define LVPHY1          0x04A4  /* LVDS PHY 1 */
> > > +#define SYSSTAT         0x0500  /* System Status  */
> > > +#define SYSRST          0x0504  /* System Reset  */
> > > +/* GPIO Registers */
> > > +#define GPIOC           0x0520  /* GPIO Control  */
> > > +#define GPIOO           0x0524  /* GPIO Output  */
> > > +#define GPIOI           0x0528  /* GPIO Input  */
> > > +
> > > +/* I2C Registers */
> > > +#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
> > > +#define I2CMADDR        0x0544  /* I2C Master Addressing */
> > > +#define WDATAQ          0x0548  /* Write Data Queue */
> > > +#define RDATAQ          0x054C  /* Read Data Queue */
> > > +
> > > +/* Chip ID and Revision ID Register */
> > > +#define IDREG           0x0580
> > > +
> > > +#define TC358775XBG_ID  0x00007500
> > > +
> > > +/* Debug Registers */
> > > +#define DEBUG00         0x05A0  /* Debug */
> > > +#define DEBUG01         0x05A4  /* LVDS Data */
> > > +
> > > +#define DSI_CLEN_BIT         BIT(0)
> > > +#define DIVIDE_BY_3          3 /* PCLK=DCLK/3 */
> > > +#define LVCFG_LVEN_BIT               BIT(0)
> > > +
> > > +#define L0EN BIT(1)
> > > +
> > > +#define TC358775_VPCTRL_VSDELAY__MASK        0x3FF00000
> > > +#define TC358775_VPCTRL_VSDELAY__SHIFT       20
> > > +static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)
> >
> >
> > Use u32 here and below, unit32_t is mainly for userspace interactions.
> >
> >
> > > +{
> > > +     return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
> > > +                     TC358775_VPCTRL_VSDELAY__MASK;
> > > +}
> > > +
> > > +#define TC358775_VPCTRL_OPXLFMT__MASK        0x00000100
> > > +#define TC358775_VPCTRL_OPXLFMT__SHIFT       8
> > > +static inline uint32_t TC358775_VPCTRL_OPXLFMT(uint32_t val)
> > > +{
> > > +     return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
> > > +                     TC358775_VPCTRL_OPXLFMT__MASK;
> > > +}
> > > +
> > > +#define TC358775_VPCTRL_MSF__MASK    0x00000001
> > > +#define TC358775_VPCTRL_MSF__SHIFT   0
> > > +static inline uint32_t TC358775_VPCTRL_MSF(uint32_t val)
> > > +{
> > > +     return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
> > > +                     TC358775_VPCTRL_MSF__MASK;
> > > +}
> > > +
> > > +#define TC358775_LVCFG_PCLKDIV__MASK 0x000000f0
> > > +#define TC358775_LVCFG_PCLKDIV__SHIFT        4
> > > +static inline uint32_t TC358775_LVCFG_PCLKDIV(uint32_t val)
> > > +{
> > > +     return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
> > > +                     TC358775_LVCFG_PCLKDIV__MASK;
> > > +}
> > > +
> > > +#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
> > > +#define TC358775_LVCFG_LVDLINK__SHIFT                        0
> > > +static inline uint32_t TC358775_LVCFG_LVDLINK(uint32_t val)
> > > +{
> > > +     return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
> > > +                     TC358775_LVCFG_LVDLINK__MASK;
> > > +}
> > > +
> > > +static const struct reg_sequence tc_fixed_registers[] = {
> > > +     { 0x013C, 0x00040006 },
> > > +     { 0x0114, 0x00000004 },
> > > +     { 0x0164, 0x00000003 },
> > > +     { 0x0168, 0x00000003 },
> > > +     { 0x016C, 0x00000003 },
> > > +     { 0x0170, 0x00000003 },
> >
> > use macros instead of magic numbers.
> >
> > > +};
> > > +
> > > +static const struct reg_sequence tc_vesa_data_format_registers[] = {
> > > +     { 0x0480, 0x03020100 },
> > > +     { 0x0484, 0x08050704 },
> > > +     { 0x0488, 0x0F0E0A09 },
> > > +     { 0x048C, 0x100D0C0B },
> > > +     { 0x0490, 0x12111716 },
> > > +     { 0x0494, 0x1B151413 },
> > > +     { 0x0498, 0x061A1918 },
> > ditto
> > > +};
> > > +
> > > +static const char * const regulator_names[] = {
> > > +     "vdd",
> > > +     "vddio"
> > > +};
> > > +
> > > +struct tc_data {
> > > +     struct i2c_client       *i2c;
> > > +
> > > +     struct device           *dev;
> > > +     struct regmap           *regmap;
> > > +
> > > +     struct drm_bridge       bridge;
> > > +     struct drm_connector    connector;
> > > +     struct drm_panel        *panel;
> > > +
> > > +     enum drm_connector_status status;
> > unused field
> > > +     struct device_node *host_node;
> > > +     struct mipi_dsi_device *dsi;
> > > +     u8 num_dsi_lanes;
> > > +
> > > +     struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> > > +     struct gpio_desc        *reset_gpio;
> > > +     struct gpio_desc        *stby_gpio;
> > > +     u32                     rev;
> > > +     u8                      dual_link; /* single-link or dual-link */
> > > +     u8                      data_format; /* VESA or JEIDA */
> > > +};
> > > +
> > > +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> > > +{
> > > +     return container_of(b, struct tc_data, bridge);
> > > +}
> > > +
> > > +static inline struct tc_data *connector_to_tc(struct drm_connector *c)
> > > +{
> > > +     return container_of(c, struct tc_data, connector);
> > > +}
> > > +
> > > +static void tc_bridge_pre_enable(struct drm_bridge *bridge)
> > > +{
> > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > +     struct device *dev = &tc->dsi->dev;
> > > +     int ret;
> > > +
> > > +     ret = regulator_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > +     if (ret < 0) {
> > > +             dev_err(dev, "regulator enable failed, %d\n", ret);
> > > +             return;
> > > +     }
> > > +     mdelay(10);

You should consider usleep_range() instead of mdelay() for large delays.

> > > +
> > > +     gpiod_set_value(tc->stby_gpio, 0);
> > > +     mdelay(10);
> > > +
> > > +     gpiod_set_value(tc->reset_gpio, 0);
> > > +     ndelay(50);
> > > +
> > > +     drm_panel_prepare(tc->panel);
> > > +}
> > > +
> > > +static void tc_bridge_disable(struct drm_bridge *bridge)
> > > +{
> > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > +     struct device *dev = &tc->dsi->dev;
> > > +     int ret;
> > > +
> > > +     ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > +     if (ret < 0)
> > > +             dev_err(dev, "regulator disable failed, %d\n", ret);
> > > +     mdelay(10);
> > > +
> > > +     gpiod_set_value(tc->stby_gpio, 1);
> > > +     mdelay(10);
> > > +
> > > +     gpiod_set_value(tc->reset_gpio, 1);
> > > +     ndelay(50);
> > > +
> > > +     drm_panel_disable(tc->panel);
> >
> > I suspect the order should be different - ie reverse to the one pre_enable.
> >
> > Moreover since it reverts pre_enable it should be put into post_disable
> > (except drm_panel_disable).
> >
> > > +}
> > > +
> > > +static void tc_bridge_post_disable(struct drm_bridge *bridge)
> > > +{
> > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > +
> > > +     drm_panel_unprepare(tc->panel);
> > > +}
> > > +
> > > +#ifdef TC358775_DEBUG
> > > +static u32 d2l_read(struct tc_data *tc, u16 reg)
> > > +{
> > > +     int ret;
> > > +     u32 data;
> > > +
> > > +     ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
> > > +     if (ret)
> > > +             return ret;
> > > +
> > > +     pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
> > > +
> > > +     return data;
> > > +}
> > > +#endif
> >
> > I guess this leftover can be removed as well.
> >
> > > +
> > > +static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
> > > +{
> > > +     int ret = 0;
> > > +
> > > +     ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
> > > +
> > > +#ifdef TC358775_DEBUG
> > > +     d2l_read(tc, reg);
> > > +#endif
> > > +     return ret;
> > > +}
> > > +
> > > +static void tc_bridge_enable(struct drm_bridge *bridge)
> > > +{
> > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > +     int ret;
> > > +     u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
> > > +     u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
> > > +     u32 val = 0;
> > > +     struct drm_display_mode *mode;
> > > +
> > > +     mode = &bridge->encoder->crtc->state->adjusted_mode;
> > > +
> > > +     hbpr = 0;
> > > +     hpw  = mode->hsync_end - mode->hsync_start;
> > > +     vbpr = 0;
> > > +     vpw  = mode->vsync_end - mode->vsync_start;
> > > +
> > > +     htime1 = (hbpr << 16) + hpw;
> > > +     vtime1 = (vbpr << 16) + vpw;
> > > +
> > > +     hfpr = mode->hsync_start - mode->hdisplay;
> > > +     hsize = mode->hdisplay;
> > > +     vfpr = mode->vsync_start - mode->vdisplay;
> > > +     vsize = mode->vdisplay;
> > > +
> > > +     htime2 = (hfpr << 16) + hsize;
> > > +     vtime2 = (vfpr << 16) + vsize;
> > > +
> > > +     ret = regmap_read(tc->regmap, IDREG, &tc->rev);
> > > +     if (ret) {
> > > +             dev_err(tc->dev, "can not read device ID: %d\n", ret);
> > > +             return;
> > > +     }
> > > +     pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
> > > +
> > > +     d2l_write(tc, SYSRST, 0x000000FF);
> > > +     mdelay(30);
> > > +
> > > +     ret = regmap_register_patch(tc->regmap,
> > > +                                 tc_fixed_registers,
> > > +                                 ARRAY_SIZE(tc_fixed_registers));
> > > +     if (ret)
> > > +             return;
> > > +
> > > +     val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
> > > +     d2l_write(tc, PPI_LANEENABLE, val);
> > > +     d2l_write(tc, DSI_LANEENABLE, val);
> > > +
> > > +     d2l_write(tc, PPI_STARTPPI, 0x00000001);
> > > +     d2l_write(tc, DSI_STARTDSI, 0x00000001);
> > > +
> > > +     val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
>
> Any suggestion how to set dynamic value for Vsyncdelay?
>
> > > +
> > > +     if (tc->connector.display_info.bpc == 8) {/* RGB888 */
> > > +             val |= TC358775_VPCTRL_OPXLFMT(1);
> > > +             d2l_write(tc, VPCTRL, val);
> > > +     } else {                                /* RGB666 */
> > > +             val |= TC358775_VPCTRL_MSF(1);
> > > +             d2l_write(tc, VPCTRL, val);
> > > +     }
> > > +
> > > +     d2l_write(tc, HTIM1, htime1);
> > > +     d2l_write(tc, VTIM1, vtime1);
> > > +     d2l_write(tc, HTIM2, htime2);
> > > +     d2l_write(tc, VTIM2, vtime2);
> > > +
> > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > +     d2l_write(tc, SYSRST, 0x00000004);
> > > +     d2l_write(tc, LVPHY0, 0x00040006);
> > > +
> > > +     if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */
> > > +             ret = regmap_register_patch
> > > +                     (tc->regmap,
> > > +                      tc_vesa_data_format_registers,
> > > +                      ARRAY_SIZE(tc_vesa_data_format_registers));
> > > +             if (ret)
> > > +                     return;
> > > +     }
> > > +
> > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > +
> > > +     val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
> > > +     if (tc->dual_link)
> > > +             val |= TC358775_LVCFG_LVDLINK(1);
> > > +
> > > +     d2l_write(tc, LVCFG, val);
> > > +
> > > +     drm_panel_enable(tc->panel);
> > > +}
> > > +
> > > +static int tc_connector_get_modes(struct drm_connector *connector)
> > > +{
> > > +     struct tc_data *tc = connector_to_tc(connector);
> > > +     struct edid *edid;
> > > +     unsigned int count;
> > > +
> > > +     if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
> > > +             count = tc->panel->funcs->get_modes(tc->panel, connector);
> > > +             if (count > 0)
> > > +                     return count;
> > > +     }
> > > +
> > > +     edid = drm_get_edid(connector, tc->i2c->adapter);
> > > +     if (!edid)
> > > +             return 0;
> > > +
> > > +     drm_connector_update_edid_property(connector, edid);
> > > +     count = drm_add_edid_modes(connector, edid);
> > > +     kfree(edid);
> > > +
> > > +     return count;
> > > +}
> > > +
> > > +static int tc_connector_mode_valid(struct drm_connector *connector,
> > > +                                struct drm_display_mode *mode)
> > > +{
> > > +     struct tc_data *tc = connector_to_tc(connector);
> > > +
> > > +     /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
> > > +     if ((mode->clock > 135000 && tc->dual_link == 0) ||
> > > +         (mode->clock > 270000 && tc->dual_link == 1))
> > > +             return MODE_CLOCK_HIGH;
> > > +
> > > +     return MODE_OK;
> > > +}

This should be replaced by the bridge .mode_valid() operation, as it's
related to the bridge, not the connector.

> > > +
> > > +static struct drm_encoder *
> > > +tc_connector_best_encoder(struct drm_connector *connector)
> > > +{
> > > +     struct tc_data *tc = connector_to_tc(connector);
> > > +
> > > +     return tc->bridge.encoder;
> > > +}
> > > +
> > > +static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
> > > +     .get_modes = tc_connector_get_modes,
> > > +     .mode_valid = tc_connector_mode_valid,
> > > +     .best_encoder = tc_connector_best_encoder,
> > > +};
> > > +
> > > +static const struct drm_connector_funcs tc_connector_funcs = {
> > > +     .fill_modes = drm_helper_probe_single_connector_modes,
> > > +     .destroy = drm_connector_cleanup,
> > > +     .reset = drm_atomic_helper_connector_reset,
> > > +     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > > +     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > > +};
> > > +
> > > +int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> > > +{
> > > +     u32 num_lanes;
> > > +     u8 dual_link, data_format;
> > > +
> > > +     of_property_read_u8(np, "tc,dual-link", &dual_link);
> > > +     of_property_read_u8(np, "tc,data-format", &data_format);
> > > +     of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
> > > +
> > > +     if (num_lanes < 1 || num_lanes > 4)
> > > +             return -EINVAL;
> > > +
> > > +     tc->num_dsi_lanes = num_lanes;
> > > +     tc->dual_link = dual_link;
> > > +     tc->data_format = data_format;
> > > +
> > > +     tc->host_node = of_graph_get_remote_node(np, 0, 0);
> > > +     if (!tc->host_node)
> > > +             return -ENODEV;
> > > +
> > > +     of_node_put(tc->host_node);
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +int tc358775_attach_dsi(struct tc_data *tc)
> > > +{
> > > +     struct device *dev = &tc->i2c->dev;
> > > +     struct mipi_dsi_host *host;
> > > +     struct mipi_dsi_device *dsi;
> > > +     int ret = 0;
> > > +     const struct mipi_dsi_device_info info = { .type = "tc358775",
> > > +                                                     .channel = 0,
> > > +                                                     .node = NULL,
> > > +                                             };
> > > +
> > > +     host = of_find_mipi_dsi_host_by_node(tc->host_node);
> > > +     if (!host) {
> > > +             dev_err(dev, "failed to find dsi host\n");
> > > +             return -EPROBE_DEFER;
> > > +     }
> > > +
> > > +     dsi = mipi_dsi_device_register_full(host, &info);
> > > +     if (IS_ERR(dsi)) {
> > > +             dev_err(dev, "failed to create dsi device\n");
> > > +             ret = PTR_ERR(dsi);
> > > +             goto err_dsi_device;
> > > +     }
> > > +
> > > +     tc->dsi = dsi;
> > > +
> > > +     dsi->lanes = tc->num_dsi_lanes;
> > > +     dsi->format = MIPI_DSI_FMT_RGB888;
> > > +     dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> > > +
> > > +     ret = mipi_dsi_attach(dsi);
> > > +     if (ret < 0) {
> > > +             dev_err(dev, "failed to attach dsi to host\n");
> > > +             goto err_dsi_attach;
> > > +     }
> > > +
> > > +     return 0;
> > > +
> > > +err_dsi_attach:
> > > +     mipi_dsi_device_unregister(dsi);
> > > +err_dsi_device:
> > > +     return ret;
> > > +}
> > > +
> > > +static int tc_bridge_attach(struct drm_bridge *bridge)
> > > +{
> > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > +     struct drm_device *drm = bridge->dev;
> > > +     int ret;
> > > +
> > > +     /* Create LVDS connector */
> > > +     drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
> > > +     ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
> > > +                              DRM_MODE_CONNECTOR_LVDS);
> > > +     if (ret)
> > > +             return ret;
> > > +
> > > +     if (tc->panel)
> > > +             drm_panel_attach(tc->panel, &tc->connector);
> > > +
> > > +     drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
> > > +
> > > +     ret = tc358775_attach_dsi(tc);
> >
> > Ignored retval.
> >
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static const struct drm_bridge_funcs tc_bridge_funcs = {
> > > +     .attach = tc_bridge_attach,
> > > +     .pre_enable = tc_bridge_pre_enable,
> > > +     .enable = tc_bridge_enable,
> > > +     .disable = tc_bridge_disable,
> > > +     .post_disable = tc_bridge_post_disable,
> > > +};
> > > +
> > > +static const struct regmap_config tc_regmap_config = {
> > > +     .name = "tc358775",
> > > +     .reg_bits = 16,
> > > +     .val_bits = 32,
> > > +     .reg_stride = 4,
> > > +     .max_register = 0x05A8,
> > > +     .cache_type = REGCACHE_RBTREE,
> > > +     .reg_format_endian = REGMAP_ENDIAN_BIG,
> > > +     .val_format_endian = REGMAP_ENDIAN_LITTLE,
> > > +};
> > > +
> > > +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
> > > +{
> > > +     struct device *dev = &client->dev;
> > > +     struct tc_data *tc;
> > > +     int ret;
> > > +     unsigned int i;
> > > +
> > > +     tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> > > +     if (!tc)
> > > +             return -ENOMEM;
> > > +
> > > +     tc->dev = dev;
> > > +     tc->i2c = client;
> > > +     tc->status = connector_status_connected;
> > > +
> > > +     /* port@1 is the output port */
> > > +     ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
> > > +     if (ret && ret != -ENODEV)
> > > +             return ret;

You should support cases where the next device is a bridge. I recommand
wrapping the panel in a drm_panel_bridge with drm_panel_bridge_add(),
and then handling the next component as a bridge in all code paths. This
will allow removing manual enable/disable of panels above, as bridge
chaining is handled automatically. drm_panel_bridge creates a
drm_connector, so you can drop your manual connector implementation
here, simplifying the code.

> > > +
> > > +     ret = tc358775_parse_dt(dev->of_node, tc);
> > > +     if (ret)
> > > +             return ret;
> > > +
> > > +     for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
> > > +             tc->supplies[i].supply = regulator_names[i];
> > > +
> > > +     ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
> > > +                                   tc->supplies);
> > > +     if (ret < 0)
> > > +             dev_err(dev, "failed to init regulator, ret=%d\n", ret);
> > > +
> > > +     tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> > > +     if (IS_ERR(tc->stby_gpio)) {
> > > +             ret = PTR_ERR(tc->stby_gpio);
> > > +             dev_err(dev, "cannot get stby-gpio %d\n", ret);
> > > +             return ret;
> > > +     }
> > > +
> > > +     tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > > +     if (IS_ERR(tc->reset_gpio)) {
> > > +             ret = PTR_ERR(tc->reset_gpio);
> > > +             dev_err(dev, "cannot get reset-gpios %d\n", ret);
> > > +             return ret;
> > > +     }
> > > +
> > > +     tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
> > > +     if (IS_ERR(tc->regmap)) {
> > > +             ret = PTR_ERR(tc->regmap);
> > > +             dev_err(dev, "Failed to initialize regmap: %d\n", ret);
> > > +             return ret;
> > > +     }
> > > +
> > > +     tc->bridge.funcs = &tc_bridge_funcs;
> > > +     tc->bridge.of_node = dev->of_node;
> > > +     drm_bridge_add(&tc->bridge);
> > > +
> > > +     i2c_set_clientdata(client, tc);
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static int tc_remove(struct i2c_client *client)
> > > +{
> > > +     struct tc_data *tc = i2c_get_clientdata(client);
> > > +
> > > +     drm_bridge_remove(&tc->bridge);
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static const struct i2c_device_id tc358775_i2c_ids[] = {
> > > +     { "tc358775", 0 },
> > > +     { }
> > > +};
> > > +MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
> > > +
> > > +static const struct of_device_id tc358775_of_ids[] = {
> > > +     { .compatible = "toshiba,tc358775", },
> > > +     { }
> > > +};
> > > +MODULE_DEVICE_TABLE(of, tc358775_of_ids);
> > > +
> > > +static struct i2c_driver tc358775_driver = {
> > > +     .driver = {
> > > +             .name = "tc358775",
> > > +             .of_match_table = tc358775_of_ids,
> > > +     },
> > > +     .id_table = tc358775_i2c_ids,
> > > +     .probe = tc_probe,
> > > +     .remove = tc_remove,
> > > +};
> > > +module_i2c_driver(tc358775_driver);
> > > +
> > > +MODULE_AUTHOR("Vinay Simha BN <vinaysimha@inforcecomputing.com>");
> > > +MODULE_DESCRIPTION("tc358775 LVDS encoder driver");
> >
> > maybe  better:
> >
> > tc358775 DSI/LVDS bridge driver
> >
> > > +MODULE_LICENSE("GPL v2");

-- 
Regards,

Laurent Pinchart

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH] display/bridge: dsi2lvds tc358775 driver
  2020-03-06 13:32       ` Laurent Pinchart
@ 2020-03-11 10:00         ` Vinay Simha B N
  2020-03-11 10:00           ` Vinay Simha B N
  2020-03-12 14:31           ` Laurent Pinchart
  0 siblings, 2 replies; 8+ messages in thread
From: Vinay Simha B N @ 2020-03-11 10:00 UTC (permalink / raw)
  To: Laurent Pinchart
  Cc: Andrzej Hajda,
	open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	Jernej Skrabec, Neil Armstrong, David Airlie, Jonas Karlman,
	open list, open list:DRM DRIVERS, Rob Herring, m.purski

Laurent Pinchart,

if we want to set to jeida-18 data mapping,
do we need to set DATA3 with "Logic 0" LVI_L0 ?

Please see reply inline.

On Fri, Mar 6, 2020 at 7:02 PM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Vinay,
>
> Thank you for the patch.
>
> On Fri, Mar 06, 2020 at 06:06:36PM +0530, Vinay Simha B N wrote:
> > hi andrzej,
> >
> > I had a doubt In the tc358764 driver,VP_CTRL, VP_CTRL_VSDELAY(15) is
> > hardcoded to 15, but this has to be dynamic based on the resolution of
> > panel used?
> >
> > Please see the reply inline.
> >
> > On Tue, Mar 3, 2020 at 8:39 PM Andrzej Hajda <a.hajda@samsung.com> wrote:
> > > On 27.02.2020 15:03, Vinay Simha BN wrote:
> > > > dsi2lvds tc358775 bridge driver added
> > > > Tested in apq8016, ifc6309 board and panel
> > > > auo,b101xtn01
> > >
> > > Just FYI, there exists already TC358764/5 driver for similar hw, but
> > > controlled via DSI bus.
> >
> > There is not much difference between these two chips, but still the
> > dsi read access for 775 does not works.
> > TC358764/5 - 800Mbps per lane, 3.2Gbps
> > TC358775 - 1Gbps per lane, 4Gbps.
> >
> > tc358775 chip details -
> > https://download.t-firefly.com/product/RK3399/Docs/Chip%20Specifications/TC358774XBG_75XBG_V1%204nm.pdf
> > I am able to configure the tc358775 chip by i2c, but from dsi it fails
> > i tried accessing the tc358775 chip by dsi using apq8016-qcom , but it
> > fails to read the chip id itself.
> >
> > Please suggest if you any inputs for this issue.
> >
> > https://github.com/vinaysimhabn/kernel-msm/commits/5.6.0-rc3-dsi2lvds-dsi
> >
> > [    4.582405] tc358764 1a98000.dsi.0: read: 1408, addr: 0
> > [    4.582426] tc358764 1a98000.dsi.0: ID: 0x0
> > [    4.582451] tc358764 1a98000.dsi.0: error initializing bridge (-22)
> >
> > [    4.796220] dsi_cmds2buf_tx: cmd dma tx failed, type=0x24, data0=0x80, len=4
> > [    4.796244] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > [    4.796266] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > [    4.796288] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > [    4.796310] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > [    4.796319] msm_dsi_host_cmd_rx:Invalid response cmd
> >
> > > > Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
> > > > ---
> > > >  .../bindings/display/bridge/toshiba,tc358775.txt   | 106 ++++
> > >
> > > Bindings should be in separate patch and in yaml format.
> > >
> > > >  drivers/gpu/drm/bridge/Kconfig                     |  10 +
> > > >  drivers/gpu/drm/bridge/Makefile                    |   1 +
> > > >  drivers/gpu/drm/bridge/tc358775.c                  | 687 +++++++++++++++++++++
> > > >  4 files changed, 804 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > >  create mode 100644 drivers/gpu/drm/bridge/tc358775.c
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > new file mode 100644
> > > > index 0000000..c4c364d
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > @@ -0,0 +1,106 @@
> > > > +Toshiba TC358775 DSI to LVDS bridge bindings
> > > > +
> > > > +Required properties:
> > > > + - compatible: "toshiba,tc358775"
> > > > + - reg: i2c address of the bridge, 0x0f
> > > > + - tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
> > > > +  be one of 1, 2, 3 or 4.
> > > > + - tc, dual-link : To configure the LVDS transmitter either
> > > > +  as single-link or dual-link.
> > > > + - tc, data-format: To configure the data formats
> > > > +   0 for VESA standard, 1 for JEIDA standard
> > >
> > > IMO, three properties above should be received from downstream device in
> > > runtime, not hardcoded into DT, however I am not sure if frameworks
> > > support it.
>
> I assume Andrzej meant upstream device for the tc,dsi-lanes property.
> This should be exposed through the data-lanes property as described in
> media/video-interface.txt.

data-lanes mainly used for the interfaces of the hardware.
example : dsi, csi
In general panels/bridges either it will be hardcoded by setting in the
panel driver like this dsi->lanes = 4;
bridge  -> dsi2hdmi display/bridge/adi,adv7511.txt it wil be set by
adi,dsi-lanes
>
> The tc,dual-link property should be replaced by exposing two port nodes,
> one for each link, and connecting them appropriately. See
> display/bridge/thine,thc63lvd1024.txt for an example of DT bindings on
> the LVDS receiver side, and drivers/gpu/drm/rcar-du/rcar_lvds.c for an
> example implementation on the LVDS transmitter side.

Can we add two port nodes though it can give only 1 output? when
higher resolution panel used dual_link is enabled in LVCFG
>
> The tc,data-format property should be replaced by the data-mapping
> property on the downstream LVDS device (see display/panel/lvds.yaml) and
> queried at runtime.
>
> > > > + - vdd-supply: 1.2V LVDS Power Supply
> > > > + - vddio-supply: 1.8V IO Power Supply
> > > > + - stby-gpios: Standby pin, Low active
> > > > + - reset-gpios: Hardware reset,      Low active
> > > > +
> > > > +Required nodes:
> > > > +
> > > > +The TC358775 has two ports. Their connections are modelled using the OF
> > > > +graph bindings specified in Documentation/devicetree/bindings/graph.txt.
> > > > +
> > > > +- Video port 0 for the DSI input. The remote endpoint phandle should be a
> > > > +     reference to a valid mipi_dsi_host device node.
> > > > +- Video port 1 for the LVDS output.
> > > > +
> > > > +Example:
> > > > +
> > > > +     i2c@78b8000 {
> > > > +             /* On High speed expansion */
> > > > +             label = "HS-I2C2";
> > > > +             status = "okay";
> > > > +
> > > > +             tc_bridge: bridge@f {
> > > > +                     status = "okay";
> > > > +
> > > > +                     compatible = "toshiba,tc358775";
> > > > +                     reg = <0x0f>;
> > > > +
> > > > +                     tc,dsi-lanes = <4>;
> > > > +                     tc,dual-link = <0>;
> > > > +                     tc,data-format = <1>;
> > > > +
> > > > +                     vdd-supply = <&pm8916_l2>;
> > > > +                     vddio-supply = <&pm8916_l6>;
> > > > +
> > > > +                     stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
> > > > +                     reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
> > > > +
> > > > +                     ports {
> > > > +                             #address-cells = <1>;
> > > > +                             #size-cells = <0>;
> > > > +
> > > > +                             port@0 {
> > > > +                                     reg = <0>;
> > > > +                                     d2l_in: endpoint {
> > > > +                                             remote-endpoint = <&dsi0_out>;
> > > > +                                     };
> > > > +                             };
> > > > +
> > > > +                             port@1 {
> > > > +                                     reg = <1>;
> > > > +                                     d2l_out: endpoint {
> > > > +                                             remote-endpoint = <&panel_in>;
> > > > +                                     };
> > > > +                             };
> > > > +                     };
> > > > +             };
> > > > +     };
> > > > +
> > > > +     panel: auo,b101xtn01 {
> > > > +                     status = "okay";
> > > > +                     compatible = "auo,b101xtn01";
> > > > +                     power-supply = <&pm8916_l14>;
> > > > +
> > > > +                     port {
> > > > +                             panel_in: endpoint {
> > > > +                                     remote-endpoint = <&d2l_out>;
> > > > +                             };
> > > > +                     };
> > > > +     };
> > > > +
> > > > +     mdss@1a00000 {
> > > > +             status = "okay";
> > > > +
> > > > +             mdp@1a01000 {
> > > > +                     status = "okay";
> > > > +             };
> > > > +
> > > > +             dsi@1a98000 {
> > > > +                     status = "okay";
> > > > +                     ..
> > > > +                     ports {
> > > > +                             port@1 {
> > > > +                                     dsi0_out: endpoint {
> > > > +                                             remote-endpoint = <&d2l_in>;
> > > > +                                             data-lanes = <0 1 2 3>;
> > > > +                                     };
> > > > +                             };
> > > > +                     };
> > > > +             };
> > > > +
> > > > +             dsi-phy@1a98300 {
> > > > +                     status = "okay";
> > > > +                     ..
> > > > +             };
> > > > +     };
> > > > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > > > index 8397bf7..d5528fa 100644
> > > > --- a/drivers/gpu/drm/bridge/Kconfig
> > > > +++ b/drivers/gpu/drm/bridge/Kconfig
> > > > @@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
> > > >       ---help---
> > > >         Toshiba TC358767 eDP bridge chip driver.
> > > >
> > > > +config DRM_TOSHIBA_TC358775
> > > > +        tristate "Toshiba TC358775 LVDS bridge"
> > > > +        depends on OF
> > > > +        select DRM_KMS_HELPER
> > > > +        select REGMAP_I2C
> > > > +        select DRM_PANEL
> > > > +     select DRM_MIPI_DSI
> > > > +        ---help---
> > > > +          Toshiba TC358775 LVDS bridge chip driver.
> > > > +
> > > >  config DRM_TI_TFP410
> > > >       tristate "TI TFP410 DVI/HDMI bridge"
> > > >       depends on OF
> > > > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> > > > index 1eb5376..9b2c512 100644
> > > > --- a/drivers/gpu/drm/bridge/Makefile
> > > > +++ b/drivers/gpu/drm/bridge/Makefile
> > > > @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
> > > >  obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> > > >  obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
> > > >  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> > > > +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
> > > >  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> > > >  obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
> > > >  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> > > > diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> > > > new file mode 100644
> > > > index 0000000..3db0f49
> > > > --- /dev/null
> > > > +++ b/drivers/gpu/drm/bridge/tc358775.c
> > > > @@ -0,0 +1,687 @@
> > > > +// SPDX-License-Identifier: GPL-2.0
> > > > +/*
> > > > + * tc358775 DSI to LVDS bridge driver
> > > > + *
> > > > + * Copyright (C) 2020 InforceComputing
> > > > + * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
> > > > + *
> > > > + * This program is free software; you can redistribute it and/or modify
> > > > + * it under the terms of the GNU General Public License as published by
> > > > + * the Free Software Foundation; either version 2 of the License, or
> > > > + * (at your option) any later version.
> > > > + *
> > > > + * This program is distributed in the hope that it will be useful,
> > > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > > > + * GNU General Public License for more details.
> > >
> > > You can drop these statements, SPDX identifier is enough.
> > >
> > > > + */
> > > > +
> > > > +/* #define DEBUG */
> > > > +/* #define TC358775_DEBUG */
> > >
> > > Please remove these development leftovers.
> > >
> > > > +#include <linux/clk.h>
> > > > +#include <linux/device.h>
> > > > +#include <linux/gpio/consumer.h>
> > > > +#include <linux/i2c.h>
> > > > +#include <linux/kernel.h>
> > > > +#include <linux/module.h>
> > > > +#include <linux/regmap.h>
> > > > +#include <linux/slab.h>
> > > > +#include <linux/regulator/consumer.h>
> > > Alphabetic order.
> > > > +
> > > > +#include <drm/drm_mipi_dsi.h>
> > > > +#include <drm/drm_atomic_helper.h>
> > > > +#include <drm/drm_crtc_helper.h>
> > > > +#include <drm/drm_dp_helper.h>
> > > > +#include <drm/drm_of.h>
> > > > +#include <drm/drm_panel.h>
> > > > +#include <drm/drm_bridge.h>
> > > > +#include <drm/drm_probe_helper.h>
> > > ditto
> > > > +
> > > > +/* Registers */
> > > > +
> > > > +/* DSI D-PHY Layer Registers */
> > > > +#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
> > > > +#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
> > > > +#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
> > > > +#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
> > > > +#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
> > > > +#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
> > > > +#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
> > > > +#define CLW_CNTRL       0x0040  /* Clock Lane Control */
> > > > +#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
> > > > +#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
> > > > +#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
> > > > +#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
> > > > +#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
> > > > +
> > > > +/* DSI PPI Layer Registers */
> > > > +#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
> > > > +#define PPI_BUSYPPI     0x0108
> > > > +#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
> > > > +#define PPI_LPTXTIMECNT 0x0114
> > > > +#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
> > > > +#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
> > > > +
> > > > +/* Analog timer function enable */
> > > > +#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
> > > > +#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
> > > > +#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
> > > > +#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
> > > > +#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
> > > > +#define PPI_D0S_CLRSIPOCOUNT    0x0164
> > > > +
> > > > +#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
> > > > +#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
> > > > +#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
> > > > +
> > > > +#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
> > > > +#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
> > > > +#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
> > > > +#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
> > > > +#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
> > > > +#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
> > > > +#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
> > > > +#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
> > > > +#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
> > > > +#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
> > > > +#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
> > > > +#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
> > > > +#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
> > > > +#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
> > > > +#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
> > > > +
> > > > +#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
> > > > +#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
> > > > +#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
> > > > +#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
> > > > +#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
> > > > +#define DSI_BUSYDSI     0x0208
> > > > +#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
> > > > +#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
> > > > +#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
> > > > +
> > > > +#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
> > > > +#define DSI_INTMASK     0x0224  /* Interrupt Mask */
> > > > +#define DSI_INTCLR      0x0228  /* Interrupt Clear */
> > > > +#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
> > > > +
> > > > +#define DSIERRCNT       0x0300  /* DSI Error Count */
> > > > +#define APLCTRL         0x0400  /* Application Layer Control */
> > > > +#define RDPKTLN         0x0404  /* Command Read Packet Length */
> > > > +
> > > > +#define VPCTRL          0x0450  /* Video Path Control */
> > > > +#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
> > > > +#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
> > > > +#define VTIM1           0x045C  /* Vertical Timing Control 1 */
> > > > +#define VTIM2           0x0460  /* Vertical Timing Control 2 */
> > > > +#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
> > > > +
> > > > +/* Mux Input Select for LVDS LINK Input */
> > > > +#define LVMX0003        0x0480  /* Bit 0 to 3 */
> > > > +#define LVMX0407        0x0484  /* Bit 4 to 7 */
> > > > +#define LVMX0811        0x0488  /* Bit 8 to 11 */
> > > > +#define LVMX1215        0x048C  /* Bit 12 to 15 */
> > > > +#define LVMX1619        0x0490  /* Bit 16 to 19 */
> > > > +#define LVMX2023        0x0494  /* Bit 20 to 23 */
> > > > +#define LVMX2427        0x0498  /* Bit 24 to 27 */
> > > > +
> > > > +#define LVCFG           0x049C  /* LVDS Configuration  */
> > > > +#define LVPHY0          0x04A0  /* LVDS PHY 0 */
> > > > +#define LVPHY1          0x04A4  /* LVDS PHY 1 */
> > > > +#define SYSSTAT         0x0500  /* System Status  */
> > > > +#define SYSRST          0x0504  /* System Reset  */
> > > > +/* GPIO Registers */
> > > > +#define GPIOC           0x0520  /* GPIO Control  */
> > > > +#define GPIOO           0x0524  /* GPIO Output  */
> > > > +#define GPIOI           0x0528  /* GPIO Input  */
> > > > +
> > > > +/* I2C Registers */
> > > > +#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
> > > > +#define I2CMADDR        0x0544  /* I2C Master Addressing */
> > > > +#define WDATAQ          0x0548  /* Write Data Queue */
> > > > +#define RDATAQ          0x054C  /* Read Data Queue */
> > > > +
> > > > +/* Chip ID and Revision ID Register */
> > > > +#define IDREG           0x0580
> > > > +
> > > > +#define TC358775XBG_ID  0x00007500
> > > > +
> > > > +/* Debug Registers */
> > > > +#define DEBUG00         0x05A0  /* Debug */
> > > > +#define DEBUG01         0x05A4  /* LVDS Data */
> > > > +
> > > > +#define DSI_CLEN_BIT         BIT(0)
> > > > +#define DIVIDE_BY_3          3 /* PCLK=DCLK/3 */
> > > > +#define LVCFG_LVEN_BIT               BIT(0)
> > > > +
> > > > +#define L0EN BIT(1)
> > > > +
> > > > +#define TC358775_VPCTRL_VSDELAY__MASK        0x3FF00000
> > > > +#define TC358775_VPCTRL_VSDELAY__SHIFT       20
> > > > +static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)
> > >
> > >
> > > Use u32 here and below, unit32_t is mainly for userspace interactions.
> > >
> > >
> > > > +{
> > > > +     return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
> > > > +                     TC358775_VPCTRL_VSDELAY__MASK;
> > > > +}
> > > > +
> > > > +#define TC358775_VPCTRL_OPXLFMT__MASK        0x00000100
> > > > +#define TC358775_VPCTRL_OPXLFMT__SHIFT       8
> > > > +static inline uint32_t TC358775_VPCTRL_OPXLFMT(uint32_t val)
> > > > +{
> > > > +     return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
> > > > +                     TC358775_VPCTRL_OPXLFMT__MASK;
> > > > +}
> > > > +
> > > > +#define TC358775_VPCTRL_MSF__MASK    0x00000001
> > > > +#define TC358775_VPCTRL_MSF__SHIFT   0
> > > > +static inline uint32_t TC358775_VPCTRL_MSF(uint32_t val)
> > > > +{
> > > > +     return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
> > > > +                     TC358775_VPCTRL_MSF__MASK;
> > > > +}
> > > > +
> > > > +#define TC358775_LVCFG_PCLKDIV__MASK 0x000000f0
> > > > +#define TC358775_LVCFG_PCLKDIV__SHIFT        4
> > > > +static inline uint32_t TC358775_LVCFG_PCLKDIV(uint32_t val)
> > > > +{
> > > > +     return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
> > > > +                     TC358775_LVCFG_PCLKDIV__MASK;
> > > > +}
> > > > +
> > > > +#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
> > > > +#define TC358775_LVCFG_LVDLINK__SHIFT                        0
> > > > +static inline uint32_t TC358775_LVCFG_LVDLINK(uint32_t val)
> > > > +{
> > > > +     return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
> > > > +                     TC358775_LVCFG_LVDLINK__MASK;
> > > > +}
> > > > +
> > > > +static const struct reg_sequence tc_fixed_registers[] = {
> > > > +     { 0x013C, 0x00040006 },
> > > > +     { 0x0114, 0x00000004 },
> > > > +     { 0x0164, 0x00000003 },
> > > > +     { 0x0168, 0x00000003 },
> > > > +     { 0x016C, 0x00000003 },
> > > > +     { 0x0170, 0x00000003 },
> > >
> > > use macros instead of magic numbers.
> > >
> > > > +};
> > > > +
> > > > +static const struct reg_sequence tc_vesa_data_format_registers[] = {
> > > > +     { 0x0480, 0x03020100 },
> > > > +     { 0x0484, 0x08050704 },
> > > > +     { 0x0488, 0x0F0E0A09 },
> > > > +     { 0x048C, 0x100D0C0B },
> > > > +     { 0x0490, 0x12111716 },
> > > > +     { 0x0494, 0x1B151413 },
> > > > +     { 0x0498, 0x061A1918 },
> > > ditto
> > > > +};
> > > > +
> > > > +static const char * const regulator_names[] = {
> > > > +     "vdd",
> > > > +     "vddio"
> > > > +};
> > > > +
> > > > +struct tc_data {
> > > > +     struct i2c_client       *i2c;
> > > > +
> > > > +     struct device           *dev;
> > > > +     struct regmap           *regmap;
> > > > +
> > > > +     struct drm_bridge       bridge;
> > > > +     struct drm_connector    connector;
> > > > +     struct drm_panel        *panel;
> > > > +
> > > > +     enum drm_connector_status status;
> > > unused field
status used in tc->status = connector_status_connected;
> > > > +     struct device_node *host_node;
> > > > +     struct mipi_dsi_device *dsi;
> > > > +     u8 num_dsi_lanes;
> > > > +
> > > > +     struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> > > > +     struct gpio_desc        *reset_gpio;
> > > > +     struct gpio_desc        *stby_gpio;
> > > > +     u32                     rev;
> > > > +     u8                      dual_link; /* single-link or dual-link */
> > > > +     u8                      data_format; /* VESA or JEIDA */
> > > > +};
> > > > +
> > > > +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> > > > +{
> > > > +     return container_of(b, struct tc_data, bridge);
> > > > +}
> > > > +
> > > > +static inline struct tc_data *connector_to_tc(struct drm_connector *c)
> > > > +{
> > > > +     return container_of(c, struct tc_data, connector);
> > > > +}
> > > > +
> > > > +static void tc_bridge_pre_enable(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +     struct device *dev = &tc->dsi->dev;
> > > > +     int ret;
> > > > +
> > > > +     ret = regulator_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > > +     if (ret < 0) {
> > > > +             dev_err(dev, "regulator enable failed, %d\n", ret);
> > > > +             return;
> > > > +     }
> > > > +     mdelay(10);
>
> You should consider usleep_range() instead of mdelay() for large delays.
>
> > > > +
> > > > +     gpiod_set_value(tc->stby_gpio, 0);
> > > > +     mdelay(10);
> > > > +
> > > > +     gpiod_set_value(tc->reset_gpio, 0);
> > > > +     ndelay(50);
> > > > +
> > > > +     drm_panel_prepare(tc->panel);
> > > > +}
> > > > +
> > > > +static void tc_bridge_disable(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +     struct device *dev = &tc->dsi->dev;
> > > > +     int ret;
> > > > +
> > > > +     ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > > +     if (ret < 0)
> > > > +             dev_err(dev, "regulator disable failed, %d\n", ret);
> > > > +     mdelay(10);
> > > > +
> > > > +     gpiod_set_value(tc->stby_gpio, 1);
> > > > +     mdelay(10);
> > > > +
> > > > +     gpiod_set_value(tc->reset_gpio, 1);
> > > > +     ndelay(50);
> > > > +
> > > > +     drm_panel_disable(tc->panel);
> > >
> > > I suspect the order should be different - ie reverse to the one pre_enable.
 - as per the datasheet it is not in reverse order

> > >
> > > Moreover since it reverts pre_enable it should be put into post_disable
> > > (except drm_panel_disable).
> > >
> > > > +}
> > > > +
> > > > +static void tc_bridge_post_disable(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +
> > > > +     drm_panel_unprepare(tc->panel);
> > > > +}
> > > > +
> > > > +#ifdef TC358775_DEBUG
> > > > +static u32 d2l_read(struct tc_data *tc, u16 reg)
> > > > +{
> > > > +     int ret;
> > > > +     u32 data;
> > > > +
> > > > +     ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
> > > > +     if (ret)
> > > > +             return ret;
> > > > +
> > > > +     pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
> > > > +
> > > > +     return data;
> > > > +}
> > > > +#endif
> > >
> > > I guess this leftover can be removed as well.
> > >
> > > > +
> > > > +static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
> > > > +{
> > > > +     int ret = 0;
> > > > +
> > > > +     ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
> > > > +
> > > > +#ifdef TC358775_DEBUG
> > > > +     d2l_read(tc, reg);
> > > > +#endif
> > > > +     return ret;
> > > > +}
> > > > +
> > > > +static void tc_bridge_enable(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +     int ret;
> > > > +     u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
> > > > +     u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
> > > > +     u32 val = 0;
> > > > +     struct drm_display_mode *mode;
> > > > +
> > > > +     mode = &bridge->encoder->crtc->state->adjusted_mode;
> > > > +
> > > > +     hbpr = 0;
> > > > +     hpw  = mode->hsync_end - mode->hsync_start;
> > > > +     vbpr = 0;
> > > > +     vpw  = mode->vsync_end - mode->vsync_start;
> > > > +
> > > > +     htime1 = (hbpr << 16) + hpw;
> > > > +     vtime1 = (vbpr << 16) + vpw;
> > > > +
> > > > +     hfpr = mode->hsync_start - mode->hdisplay;
> > > > +     hsize = mode->hdisplay;
> > > > +     vfpr = mode->vsync_start - mode->vdisplay;
> > > > +     vsize = mode->vdisplay;
> > > > +
> > > > +     htime2 = (hfpr << 16) + hsize;
> > > > +     vtime2 = (vfpr << 16) + vsize;
> > > > +
> > > > +     ret = regmap_read(tc->regmap, IDREG, &tc->rev);
> > > > +     if (ret) {
> > > > +             dev_err(tc->dev, "can not read device ID: %d\n", ret);
> > > > +             return;
> > > > +     }
> > > > +     pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
> > > > +
> > > > +     d2l_write(tc, SYSRST, 0x000000FF);
> > > > +     mdelay(30);
> > > > +
> > > > +     ret = regmap_register_patch(tc->regmap,
> > > > +                                 tc_fixed_registers,
> > > > +                                 ARRAY_SIZE(tc_fixed_registers));
> > > > +     if (ret)
> > > > +             return;
> > > > +
> > > > +     val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
> > > > +     d2l_write(tc, PPI_LANEENABLE, val);
> > > > +     d2l_write(tc, DSI_LANEENABLE, val);
> > > > +
> > > > +     d2l_write(tc, PPI_STARTPPI, 0x00000001);
> > > > +     d2l_write(tc, DSI_STARTDSI, 0x00000001);
> > > > +
> > > > +     val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
> >
> > Any suggestion how to set dynamic value for Vsyncdelay?
> >
> > > > +
> > > > +     if (tc->connector.display_info.bpc == 8) {/* RGB888 */
> > > > +             val |= TC358775_VPCTRL_OPXLFMT(1);
> > > > +             d2l_write(tc, VPCTRL, val);
> > > > +     } else {                                /* RGB666 */
> > > > +             val |= TC358775_VPCTRL_MSF(1);
> > > > +             d2l_write(tc, VPCTRL, val);
> > > > +     }
> > > > +
> > > > +     d2l_write(tc, HTIM1, htime1);
> > > > +     d2l_write(tc, VTIM1, vtime1);
> > > > +     d2l_write(tc, HTIM2, htime2);
> > > > +     d2l_write(tc, VTIM2, vtime2);
> > > > +
> > > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > > +     d2l_write(tc, SYSRST, 0x00000004);
> > > > +     d2l_write(tc, LVPHY0, 0x00040006);
> > > > +
> > > > +     if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */
> > > > +             ret = regmap_register_patch
> > > > +                     (tc->regmap,
> > > > +                      tc_vesa_data_format_registers,
> > > > +                      ARRAY_SIZE(tc_vesa_data_format_registers));
> > > > +             if (ret)
> > > > +                     return;
> > > > +     }
> > > > +
> > > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > > +
> > > > +     val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
> > > > +     if (tc->dual_link)
> > > > +             val |= TC358775_LVCFG_LVDLINK(1);
> > > > +
> > > > +     d2l_write(tc, LVCFG, val);
> > > > +
> > > > +     drm_panel_enable(tc->panel);
> > > > +}
> > > > +
> > > > +static int tc_connector_get_modes(struct drm_connector *connector)
> > > > +{
> > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > +     struct edid *edid;
> > > > +     unsigned int count;
> > > > +
> > > > +     if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
> > > > +             count = tc->panel->funcs->get_modes(tc->panel, connector);
> > > > +             if (count > 0)
> > > > +                     return count;
> > > > +     }
> > > > +
> > > > +     edid = drm_get_edid(connector, tc->i2c->adapter);
> > > > +     if (!edid)
> > > > +             return 0;
> > > > +
> > > > +     drm_connector_update_edid_property(connector, edid);
> > > > +     count = drm_add_edid_modes(connector, edid);
> > > > +     kfree(edid);
> > > > +
> > > > +     return count;
> > > > +}
> > > > +
> > > > +static int tc_connector_mode_valid(struct drm_connector *connector,
> > > > +                                struct drm_display_mode *mode)
> > > > +{
> > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > +
> > > > +     /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
> > > > +     if ((mode->clock > 135000 && tc->dual_link == 0) ||
> > > > +         (mode->clock > 270000 && tc->dual_link == 1))
> > > > +             return MODE_CLOCK_HIGH;
> > > > +
> > > > +     return MODE_OK;
> > > > +}
>
> This should be replaced by the bridge .mode_valid() operation, as it's
> related to the bridge, not the connector.
>
> > > > +
> > > > +static struct drm_encoder *
> > > > +tc_connector_best_encoder(struct drm_connector *connector)
> > > > +{
> > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > +
> > > > +     return tc->bridge.encoder;
> > > > +}
> > > > +
> > > > +static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
> > > > +     .get_modes = tc_connector_get_modes,
> > > > +     .mode_valid = tc_connector_mode_valid,
> > > > +     .best_encoder = tc_connector_best_encoder,
> > > > +};
> > > > +
> > > > +static const struct drm_connector_funcs tc_connector_funcs = {
> > > > +     .fill_modes = drm_helper_probe_single_connector_modes,
> > > > +     .destroy = drm_connector_cleanup,
> > > > +     .reset = drm_atomic_helper_connector_reset,
> > > > +     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > > > +     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > > > +};
> > > > +
> > > > +int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> > > > +{
> > > > +     u32 num_lanes;
> > > > +     u8 dual_link, data_format;
> > > > +
> > > > +     of_property_read_u8(np, "tc,dual-link", &dual_link);
> > > > +     of_property_read_u8(np, "tc,data-format", &data_format);
> > > > +     of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
> > > > +
> > > > +     if (num_lanes < 1 || num_lanes > 4)
> > > > +             return -EINVAL;
> > > > +
> > > > +     tc->num_dsi_lanes = num_lanes;
> > > > +     tc->dual_link = dual_link;
> > > > +     tc->data_format = data_format;
> > > > +
> > > > +     tc->host_node = of_graph_get_remote_node(np, 0, 0);
> > > > +     if (!tc->host_node)
> > > > +             return -ENODEV;
> > > > +
> > > > +     of_node_put(tc->host_node);
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +
> > > > +int tc358775_attach_dsi(struct tc_data *tc)
> > > > +{
> > > > +     struct device *dev = &tc->i2c->dev;
> > > > +     struct mipi_dsi_host *host;
> > > > +     struct mipi_dsi_device *dsi;
> > > > +     int ret = 0;
> > > > +     const struct mipi_dsi_device_info info = { .type = "tc358775",
> > > > +                                                     .channel = 0,
> > > > +                                                     .node = NULL,
> > > > +                                             };
> > > > +
> > > > +     host = of_find_mipi_dsi_host_by_node(tc->host_node);
> > > > +     if (!host) {
> > > > +             dev_err(dev, "failed to find dsi host\n");
> > > > +             return -EPROBE_DEFER;
> > > > +     }
> > > > +
> > > > +     dsi = mipi_dsi_device_register_full(host, &info);
> > > > +     if (IS_ERR(dsi)) {
> > > > +             dev_err(dev, "failed to create dsi device\n");
> > > > +             ret = PTR_ERR(dsi);
> > > > +             goto err_dsi_device;
> > > > +     }
> > > > +
> > > > +     tc->dsi = dsi;
> > > > +
> > > > +     dsi->lanes = tc->num_dsi_lanes;
> > > > +     dsi->format = MIPI_DSI_FMT_RGB888;
> > > > +     dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> > > > +
> > > > +     ret = mipi_dsi_attach(dsi);
> > > > +     if (ret < 0) {
> > > > +             dev_err(dev, "failed to attach dsi to host\n");
> > > > +             goto err_dsi_attach;
> > > > +     }
> > > > +
> > > > +     return 0;
> > > > +
> > > > +err_dsi_attach:
> > > > +     mipi_dsi_device_unregister(dsi);
> > > > +err_dsi_device:
> > > > +     return ret;
> > > > +}
> > > > +
> > > > +static int tc_bridge_attach(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +     struct drm_device *drm = bridge->dev;
> > > > +     int ret;
> > > > +
> > > > +     /* Create LVDS connector */
> > > > +     drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
> > > > +     ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
> > > > +                              DRM_MODE_CONNECTOR_LVDS);
> > > > +     if (ret)
> > > > +             return ret;
> > > > +
> > > > +     if (tc->panel)
> > > > +             drm_panel_attach(tc->panel, &tc->connector);
> > > > +
> > > > +     drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
> > > > +
> > > > +     ret = tc358775_attach_dsi(tc);
> > >
> > > Ignored retval.
> > >
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +
> > > > +static const struct drm_bridge_funcs tc_bridge_funcs = {
> > > > +     .attach = tc_bridge_attach,
> > > > +     .pre_enable = tc_bridge_pre_enable,
> > > > +     .enable = tc_bridge_enable,
> > > > +     .disable = tc_bridge_disable,
> > > > +     .post_disable = tc_bridge_post_disable,
> > > > +};
> > > > +
> > > > +static const struct regmap_config tc_regmap_config = {
> > > > +     .name = "tc358775",
> > > > +     .reg_bits = 16,
> > > > +     .val_bits = 32,
> > > > +     .reg_stride = 4,
> > > > +     .max_register = 0x05A8,
> > > > +     .cache_type = REGCACHE_RBTREE,
> > > > +     .reg_format_endian = REGMAP_ENDIAN_BIG,
> > > > +     .val_format_endian = REGMAP_ENDIAN_LITTLE,
> > > > +};
> > > > +
> > > > +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
> > > > +{
> > > > +     struct device *dev = &client->dev;
> > > > +     struct tc_data *tc;
> > > > +     int ret;
> > > > +     unsigned int i;
> > > > +
> > > > +     tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> > > > +     if (!tc)
> > > > +             return -ENOMEM;
> > > > +
> > > > +     tc->dev = dev;
> > > > +     tc->i2c = client;
> > > > +     tc->status = connector_status_connected;
> > > > +
> > > > +     /* port@1 is the output port */
> > > > +     ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
> > > > +     if (ret && ret != -ENODEV)
> > > > +             return ret;
>
> You should support cases where the next device is a bridge. I recommand
> wrapping the panel in a drm_panel_bridge with drm_panel_bridge_add(),
> and then handling the next component as a bridge in all code paths. This
> will allow removing manual enable/disable of panels above, as bridge
> chaining is handled automatically. drm_panel_bridge creates a
> drm_connector, so you can drop your manual connector implementation
> here, simplifying the code.
>
i am not clear on this drm_panel_bridge_add() usage, please
clarify/any reference would be helpful.
> > > > +
> > > > +     ret = tc358775_parse_dt(dev->of_node, tc);
> > > > +     if (ret)
> > > > +             return ret;
> > > > +
> > > > +     for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
> > > > +             tc->supplies[i].supply = regulator_names[i];
> > > > +
> > > > +     ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
> > > > +                                   tc->supplies);
> > > > +     if (ret < 0)
> > > > +             dev_err(dev, "failed to init regulator, ret=%d\n", ret);
> > > > +
> > > > +     tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> > > > +     if (IS_ERR(tc->stby_gpio)) {
> > > > +             ret = PTR_ERR(tc->stby_gpio);
> > > > +             dev_err(dev, "cannot get stby-gpio %d\n", ret);
> > > > +             return ret;
> > > > +     }
> > > > +
> > > > +     tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > > > +     if (IS_ERR(tc->reset_gpio)) {
> > > > +             ret = PTR_ERR(tc->reset_gpio);
> > > > +             dev_err(dev, "cannot get reset-gpios %d\n", ret);
> > > > +             return ret;
> > > > +     }
> > > > +
> > > > +     tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
> > > > +     if (IS_ERR(tc->regmap)) {
> > > > +             ret = PTR_ERR(tc->regmap);
> > > > +             dev_err(dev, "Failed to initialize regmap: %d\n", ret);
> > > > +             return ret;
> > > > +     }
> > > > +
> > > > +     tc->bridge.funcs = &tc_bridge_funcs;
> > > > +     tc->bridge.of_node = dev->of_node;
> > > > +     drm_bridge_add(&tc->bridge);
> > > > +
> > > > +     i2c_set_clientdata(client, tc);
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +
> > > > +static int tc_remove(struct i2c_client *client)
> > > > +{
> > > > +     struct tc_data *tc = i2c_get_clientdata(client);
> > > > +
> > > > +     drm_bridge_remove(&tc->bridge);
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +
> > > > +static const struct i2c_device_id tc358775_i2c_ids[] = {
> > > > +     { "tc358775", 0 },
> > > > +     { }
> > > > +};
> > > > +MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
> > > > +
> > > > +static const struct of_device_id tc358775_of_ids[] = {
> > > > +     { .compatible = "toshiba,tc358775", },
> > > > +     { }
> > > > +};
> > > > +MODULE_DEVICE_TABLE(of, tc358775_of_ids);
> > > > +
> > > > +static struct i2c_driver tc358775_driver = {
> > > > +     .driver = {
> > > > +             .name = "tc358775",
> > > > +             .of_match_table = tc358775_of_ids,
> > > > +     },
> > > > +     .id_table = tc358775_i2c_ids,
> > > > +     .probe = tc_probe,
> > > > +     .remove = tc_remove,
> > > > +};
> > > > +module_i2c_driver(tc358775_driver);
> > > > +
> > > > +MODULE_AUTHOR("Vinay Simha BN <vinaysimha@inforcecomputing.com>");
> > > > +MODULE_DESCRIPTION("tc358775 LVDS encoder driver");
> > >
> > > maybe  better:
> > >
> > > tc358775 DSI/LVDS bridge driver
> > >
> > > > +MODULE_LICENSE("GPL v2");
>
> --
> Regards,
>
> Laurent Pinchart



-- 
regards,
vinaysimha

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH] display/bridge: dsi2lvds tc358775 driver
  2020-03-11 10:00         ` Vinay Simha B N
@ 2020-03-11 10:00           ` Vinay Simha B N
  2020-03-12 14:31           ` Laurent Pinchart
  1 sibling, 0 replies; 8+ messages in thread
From: Vinay Simha B N @ 2020-03-11 10:00 UTC (permalink / raw)
  To: Laurent Pinchart
  Cc: Andrzej Hajda,
	open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	Jernej Skrabec, Neil Armstrong, David Airlie, Jonas Karlman,
	open list, open list:DRM DRIVERS, Rob Herring, m.purski

Laurent Pinchart,

if we want to set to jeida-18 data mapping,
do we need to set DATA3 with "Logic 0" LVI_L0 ?

Please see reply inline.

On Fri, Mar 6, 2020 at 7:02 PM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Vinay,
>
> Thank you for the patch.
>
> On Fri, Mar 06, 2020 at 06:06:36PM +0530, Vinay Simha B N wrote:
> > hi andrzej,
> >
> > I had a doubt In the tc358764 driver,VP_CTRL, VP_CTRL_VSDELAY(15) is
> > hardcoded to 15, but this has to be dynamic based on the resolution of
> > panel used?
> >
> > Please see the reply inline.
> >
> > On Tue, Mar 3, 2020 at 8:39 PM Andrzej Hajda <a.hajda@samsung.com> wrote:
> > > On 27.02.2020 15:03, Vinay Simha BN wrote:
> > > > dsi2lvds tc358775 bridge driver added
> > > > Tested in apq8016, ifc6309 board and panel
> > > > auo,b101xtn01
> > >
> > > Just FYI, there exists already TC358764/5 driver for similar hw, but
> > > controlled via DSI bus.
> >
> > There is not much difference between these two chips, but still the
> > dsi read access for 775 does not works.
> > TC358764/5 - 800Mbps per lane, 3.2Gbps
> > TC358775 - 1Gbps per lane, 4Gbps.
> >
> > tc358775 chip details -
> > https://download.t-firefly.com/product/RK3399/Docs/Chip%20Specifications/TC358774XBG_75XBG_V1%204nm.pdf
> > I am able to configure the tc358775 chip by i2c, but from dsi it fails
> > i tried accessing the tc358775 chip by dsi using apq8016-qcom , but it
> > fails to read the chip id itself.
> >
> > Please suggest if you any inputs for this issue.
> >
> > https://github.com/vinaysimhabn/kernel-msm/commits/5.6.0-rc3-dsi2lvds-dsi
> >
> > [    4.582405] tc358764 1a98000.dsi.0: read: 1408, addr: 0
> > [    4.582426] tc358764 1a98000.dsi.0: ID: 0x0
> > [    4.582451] tc358764 1a98000.dsi.0: error initializing bridge (-22)
> >
> > [    4.796220] dsi_cmds2buf_tx: cmd dma tx failed, type=0x24, data0=0x80, len=4
> > [    4.796244] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > [    4.796266] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > [    4.796288] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > [    4.796310] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > [    4.796319] msm_dsi_host_cmd_rx:Invalid response cmd
> >
> > > > Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
> > > > ---
> > > >  .../bindings/display/bridge/toshiba,tc358775.txt   | 106 ++++
> > >
> > > Bindings should be in separate patch and in yaml format.
> > >
> > > >  drivers/gpu/drm/bridge/Kconfig                     |  10 +
> > > >  drivers/gpu/drm/bridge/Makefile                    |   1 +
> > > >  drivers/gpu/drm/bridge/tc358775.c                  | 687 +++++++++++++++++++++
> > > >  4 files changed, 804 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > >  create mode 100644 drivers/gpu/drm/bridge/tc358775.c
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > new file mode 100644
> > > > index 0000000..c4c364d
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > @@ -0,0 +1,106 @@
> > > > +Toshiba TC358775 DSI to LVDS bridge bindings
> > > > +
> > > > +Required properties:
> > > > + - compatible: "toshiba,tc358775"
> > > > + - reg: i2c address of the bridge, 0x0f
> > > > + - tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
> > > > +  be one of 1, 2, 3 or 4.
> > > > + - tc, dual-link : To configure the LVDS transmitter either
> > > > +  as single-link or dual-link.
> > > > + - tc, data-format: To configure the data formats
> > > > +   0 for VESA standard, 1 for JEIDA standard
> > >
> > > IMO, three properties above should be received from downstream device in
> > > runtime, not hardcoded into DT, however I am not sure if frameworks
> > > support it.
>
> I assume Andrzej meant upstream device for the tc,dsi-lanes property.
> This should be exposed through the data-lanes property as described in
> media/video-interface.txt.

data-lanes mainly used for the interfaces of the hardware.
example : dsi, csi
In general panels/bridges either it will be hardcoded by setting in the
panel driver like this dsi->lanes = 4;
bridge  -> dsi2hdmi display/bridge/adi,adv7511.txt it wil be set by
adi,dsi-lanes
>
> The tc,dual-link property should be replaced by exposing two port nodes,
> one for each link, and connecting them appropriately. See
> display/bridge/thine,thc63lvd1024.txt for an example of DT bindings on
> the LVDS receiver side, and drivers/gpu/drm/rcar-du/rcar_lvds.c for an
> example implementation on the LVDS transmitter side.

Can we add two port nodes though it can give only 1 output? when
higher resolution panel used dual_link is enabled in LVCFG
>
> The tc,data-format property should be replaced by the data-mapping
> property on the downstream LVDS device (see display/panel/lvds.yaml) and
> queried at runtime.
>
> > > > + - vdd-supply: 1.2V LVDS Power Supply
> > > > + - vddio-supply: 1.8V IO Power Supply
> > > > + - stby-gpios: Standby pin, Low active
> > > > + - reset-gpios: Hardware reset,      Low active
> > > > +
> > > > +Required nodes:
> > > > +
> > > > +The TC358775 has two ports. Their connections are modelled using the OF
> > > > +graph bindings specified in Documentation/devicetree/bindings/graph.txt.
> > > > +
> > > > +- Video port 0 for the DSI input. The remote endpoint phandle should be a
> > > > +     reference to a valid mipi_dsi_host device node.
> > > > +- Video port 1 for the LVDS output.
> > > > +
> > > > +Example:
> > > > +
> > > > +     i2c@78b8000 {
> > > > +             /* On High speed expansion */
> > > > +             label = "HS-I2C2";
> > > > +             status = "okay";
> > > > +
> > > > +             tc_bridge: bridge@f {
> > > > +                     status = "okay";
> > > > +
> > > > +                     compatible = "toshiba,tc358775";
> > > > +                     reg = <0x0f>;
> > > > +
> > > > +                     tc,dsi-lanes = <4>;
> > > > +                     tc,dual-link = <0>;
> > > > +                     tc,data-format = <1>;
> > > > +
> > > > +                     vdd-supply = <&pm8916_l2>;
> > > > +                     vddio-supply = <&pm8916_l6>;
> > > > +
> > > > +                     stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
> > > > +                     reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
> > > > +
> > > > +                     ports {
> > > > +                             #address-cells = <1>;
> > > > +                             #size-cells = <0>;
> > > > +
> > > > +                             port@0 {
> > > > +                                     reg = <0>;
> > > > +                                     d2l_in: endpoint {
> > > > +                                             remote-endpoint = <&dsi0_out>;
> > > > +                                     };
> > > > +                             };
> > > > +
> > > > +                             port@1 {
> > > > +                                     reg = <1>;
> > > > +                                     d2l_out: endpoint {
> > > > +                                             remote-endpoint = <&panel_in>;
> > > > +                                     };
> > > > +                             };
> > > > +                     };
> > > > +             };
> > > > +     };
> > > > +
> > > > +     panel: auo,b101xtn01 {
> > > > +                     status = "okay";
> > > > +                     compatible = "auo,b101xtn01";
> > > > +                     power-supply = <&pm8916_l14>;
> > > > +
> > > > +                     port {
> > > > +                             panel_in: endpoint {
> > > > +                                     remote-endpoint = <&d2l_out>;
> > > > +                             };
> > > > +                     };
> > > > +     };
> > > > +
> > > > +     mdss@1a00000 {
> > > > +             status = "okay";
> > > > +
> > > > +             mdp@1a01000 {
> > > > +                     status = "okay";
> > > > +             };
> > > > +
> > > > +             dsi@1a98000 {
> > > > +                     status = "okay";
> > > > +                     ..
> > > > +                     ports {
> > > > +                             port@1 {
> > > > +                                     dsi0_out: endpoint {
> > > > +                                             remote-endpoint = <&d2l_in>;
> > > > +                                             data-lanes = <0 1 2 3>;
> > > > +                                     };
> > > > +                             };
> > > > +                     };
> > > > +             };
> > > > +
> > > > +             dsi-phy@1a98300 {
> > > > +                     status = "okay";
> > > > +                     ..
> > > > +             };
> > > > +     };
> > > > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > > > index 8397bf7..d5528fa 100644
> > > > --- a/drivers/gpu/drm/bridge/Kconfig
> > > > +++ b/drivers/gpu/drm/bridge/Kconfig
> > > > @@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
> > > >       ---help---
> > > >         Toshiba TC358767 eDP bridge chip driver.
> > > >
> > > > +config DRM_TOSHIBA_TC358775
> > > > +        tristate "Toshiba TC358775 LVDS bridge"
> > > > +        depends on OF
> > > > +        select DRM_KMS_HELPER
> > > > +        select REGMAP_I2C
> > > > +        select DRM_PANEL
> > > > +     select DRM_MIPI_DSI
> > > > +        ---help---
> > > > +          Toshiba TC358775 LVDS bridge chip driver.
> > > > +
> > > >  config DRM_TI_TFP410
> > > >       tristate "TI TFP410 DVI/HDMI bridge"
> > > >       depends on OF
> > > > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> > > > index 1eb5376..9b2c512 100644
> > > > --- a/drivers/gpu/drm/bridge/Makefile
> > > > +++ b/drivers/gpu/drm/bridge/Makefile
> > > > @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
> > > >  obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> > > >  obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
> > > >  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> > > > +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
> > > >  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> > > >  obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
> > > >  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> > > > diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> > > > new file mode 100644
> > > > index 0000000..3db0f49
> > > > --- /dev/null
> > > > +++ b/drivers/gpu/drm/bridge/tc358775.c
> > > > @@ -0,0 +1,687 @@
> > > > +// SPDX-License-Identifier: GPL-2.0
> > > > +/*
> > > > + * tc358775 DSI to LVDS bridge driver
> > > > + *
> > > > + * Copyright (C) 2020 InforceComputing
> > > > + * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
> > > > + *
> > > > + * This program is free software; you can redistribute it and/or modify
> > > > + * it under the terms of the GNU General Public License as published by
> > > > + * the Free Software Foundation; either version 2 of the License, or
> > > > + * (at your option) any later version.
> > > > + *
> > > > + * This program is distributed in the hope that it will be useful,
> > > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > > > + * GNU General Public License for more details.
> > >
> > > You can drop these statements, SPDX identifier is enough.
> > >
> > > > + */
> > > > +
> > > > +/* #define DEBUG */
> > > > +/* #define TC358775_DEBUG */
> > >
> > > Please remove these development leftovers.
> > >
> > > > +#include <linux/clk.h>
> > > > +#include <linux/device.h>
> > > > +#include <linux/gpio/consumer.h>
> > > > +#include <linux/i2c.h>
> > > > +#include <linux/kernel.h>
> > > > +#include <linux/module.h>
> > > > +#include <linux/regmap.h>
> > > > +#include <linux/slab.h>
> > > > +#include <linux/regulator/consumer.h>
> > > Alphabetic order.
> > > > +
> > > > +#include <drm/drm_mipi_dsi.h>
> > > > +#include <drm/drm_atomic_helper.h>
> > > > +#include <drm/drm_crtc_helper.h>
> > > > +#include <drm/drm_dp_helper.h>
> > > > +#include <drm/drm_of.h>
> > > > +#include <drm/drm_panel.h>
> > > > +#include <drm/drm_bridge.h>
> > > > +#include <drm/drm_probe_helper.h>
> > > ditto
> > > > +
> > > > +/* Registers */
> > > > +
> > > > +/* DSI D-PHY Layer Registers */
> > > > +#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
> > > > +#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
> > > > +#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
> > > > +#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
> > > > +#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
> > > > +#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
> > > > +#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
> > > > +#define CLW_CNTRL       0x0040  /* Clock Lane Control */
> > > > +#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
> > > > +#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
> > > > +#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
> > > > +#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
> > > > +#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
> > > > +
> > > > +/* DSI PPI Layer Registers */
> > > > +#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
> > > > +#define PPI_BUSYPPI     0x0108
> > > > +#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
> > > > +#define PPI_LPTXTIMECNT 0x0114
> > > > +#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
> > > > +#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
> > > > +
> > > > +/* Analog timer function enable */
> > > > +#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
> > > > +#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
> > > > +#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
> > > > +#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
> > > > +#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
> > > > +#define PPI_D0S_CLRSIPOCOUNT    0x0164
> > > > +
> > > > +#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
> > > > +#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
> > > > +#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
> > > > +
> > > > +#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
> > > > +#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
> > > > +#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
> > > > +#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
> > > > +#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
> > > > +#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
> > > > +#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
> > > > +#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
> > > > +#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
> > > > +#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
> > > > +#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
> > > > +#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
> > > > +#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
> > > > +#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
> > > > +#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
> > > > +
> > > > +#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
> > > > +#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
> > > > +#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
> > > > +#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
> > > > +#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
> > > > +#define DSI_BUSYDSI     0x0208
> > > > +#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
> > > > +#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
> > > > +#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
> > > > +
> > > > +#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
> > > > +#define DSI_INTMASK     0x0224  /* Interrupt Mask */
> > > > +#define DSI_INTCLR      0x0228  /* Interrupt Clear */
> > > > +#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
> > > > +
> > > > +#define DSIERRCNT       0x0300  /* DSI Error Count */
> > > > +#define APLCTRL         0x0400  /* Application Layer Control */
> > > > +#define RDPKTLN         0x0404  /* Command Read Packet Length */
> > > > +
> > > > +#define VPCTRL          0x0450  /* Video Path Control */
> > > > +#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
> > > > +#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
> > > > +#define VTIM1           0x045C  /* Vertical Timing Control 1 */
> > > > +#define VTIM2           0x0460  /* Vertical Timing Control 2 */
> > > > +#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
> > > > +
> > > > +/* Mux Input Select for LVDS LINK Input */
> > > > +#define LVMX0003        0x0480  /* Bit 0 to 3 */
> > > > +#define LVMX0407        0x0484  /* Bit 4 to 7 */
> > > > +#define LVMX0811        0x0488  /* Bit 8 to 11 */
> > > > +#define LVMX1215        0x048C  /* Bit 12 to 15 */
> > > > +#define LVMX1619        0x0490  /* Bit 16 to 19 */
> > > > +#define LVMX2023        0x0494  /* Bit 20 to 23 */
> > > > +#define LVMX2427        0x0498  /* Bit 24 to 27 */
> > > > +
> > > > +#define LVCFG           0x049C  /* LVDS Configuration  */
> > > > +#define LVPHY0          0x04A0  /* LVDS PHY 0 */
> > > > +#define LVPHY1          0x04A4  /* LVDS PHY 1 */
> > > > +#define SYSSTAT         0x0500  /* System Status  */
> > > > +#define SYSRST          0x0504  /* System Reset  */
> > > > +/* GPIO Registers */
> > > > +#define GPIOC           0x0520  /* GPIO Control  */
> > > > +#define GPIOO           0x0524  /* GPIO Output  */
> > > > +#define GPIOI           0x0528  /* GPIO Input  */
> > > > +
> > > > +/* I2C Registers */
> > > > +#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
> > > > +#define I2CMADDR        0x0544  /* I2C Master Addressing */
> > > > +#define WDATAQ          0x0548  /* Write Data Queue */
> > > > +#define RDATAQ          0x054C  /* Read Data Queue */
> > > > +
> > > > +/* Chip ID and Revision ID Register */
> > > > +#define IDREG           0x0580
> > > > +
> > > > +#define TC358775XBG_ID  0x00007500
> > > > +
> > > > +/* Debug Registers */
> > > > +#define DEBUG00         0x05A0  /* Debug */
> > > > +#define DEBUG01         0x05A4  /* LVDS Data */
> > > > +
> > > > +#define DSI_CLEN_BIT         BIT(0)
> > > > +#define DIVIDE_BY_3          3 /* PCLK=DCLK/3 */
> > > > +#define LVCFG_LVEN_BIT               BIT(0)
> > > > +
> > > > +#define L0EN BIT(1)
> > > > +
> > > > +#define TC358775_VPCTRL_VSDELAY__MASK        0x3FF00000
> > > > +#define TC358775_VPCTRL_VSDELAY__SHIFT       20
> > > > +static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)
> > >
> > >
> > > Use u32 here and below, unit32_t is mainly for userspace interactions.
> > >
> > >
> > > > +{
> > > > +     return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
> > > > +                     TC358775_VPCTRL_VSDELAY__MASK;
> > > > +}
> > > > +
> > > > +#define TC358775_VPCTRL_OPXLFMT__MASK        0x00000100
> > > > +#define TC358775_VPCTRL_OPXLFMT__SHIFT       8
> > > > +static inline uint32_t TC358775_VPCTRL_OPXLFMT(uint32_t val)
> > > > +{
> > > > +     return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
> > > > +                     TC358775_VPCTRL_OPXLFMT__MASK;
> > > > +}
> > > > +
> > > > +#define TC358775_VPCTRL_MSF__MASK    0x00000001
> > > > +#define TC358775_VPCTRL_MSF__SHIFT   0
> > > > +static inline uint32_t TC358775_VPCTRL_MSF(uint32_t val)
> > > > +{
> > > > +     return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
> > > > +                     TC358775_VPCTRL_MSF__MASK;
> > > > +}
> > > > +
> > > > +#define TC358775_LVCFG_PCLKDIV__MASK 0x000000f0
> > > > +#define TC358775_LVCFG_PCLKDIV__SHIFT        4
> > > > +static inline uint32_t TC358775_LVCFG_PCLKDIV(uint32_t val)
> > > > +{
> > > > +     return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
> > > > +                     TC358775_LVCFG_PCLKDIV__MASK;
> > > > +}
> > > > +
> > > > +#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
> > > > +#define TC358775_LVCFG_LVDLINK__SHIFT                        0
> > > > +static inline uint32_t TC358775_LVCFG_LVDLINK(uint32_t val)
> > > > +{
> > > > +     return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
> > > > +                     TC358775_LVCFG_LVDLINK__MASK;
> > > > +}
> > > > +
> > > > +static const struct reg_sequence tc_fixed_registers[] = {
> > > > +     { 0x013C, 0x00040006 },
> > > > +     { 0x0114, 0x00000004 },
> > > > +     { 0x0164, 0x00000003 },
> > > > +     { 0x0168, 0x00000003 },
> > > > +     { 0x016C, 0x00000003 },
> > > > +     { 0x0170, 0x00000003 },
> > >
> > > use macros instead of magic numbers.
> > >
> > > > +};
> > > > +
> > > > +static const struct reg_sequence tc_vesa_data_format_registers[] = {
> > > > +     { 0x0480, 0x03020100 },
> > > > +     { 0x0484, 0x08050704 },
> > > > +     { 0x0488, 0x0F0E0A09 },
> > > > +     { 0x048C, 0x100D0C0B },
> > > > +     { 0x0490, 0x12111716 },
> > > > +     { 0x0494, 0x1B151413 },
> > > > +     { 0x0498, 0x061A1918 },
> > > ditto
> > > > +};
> > > > +
> > > > +static const char * const regulator_names[] = {
> > > > +     "vdd",
> > > > +     "vddio"
> > > > +};
> > > > +
> > > > +struct tc_data {
> > > > +     struct i2c_client       *i2c;
> > > > +
> > > > +     struct device           *dev;
> > > > +     struct regmap           *regmap;
> > > > +
> > > > +     struct drm_bridge       bridge;
> > > > +     struct drm_connector    connector;
> > > > +     struct drm_panel        *panel;
> > > > +
> > > > +     enum drm_connector_status status;
> > > unused field
status used in tc->status = connector_status_connected;
> > > > +     struct device_node *host_node;
> > > > +     struct mipi_dsi_device *dsi;
> > > > +     u8 num_dsi_lanes;
> > > > +
> > > > +     struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> > > > +     struct gpio_desc        *reset_gpio;
> > > > +     struct gpio_desc        *stby_gpio;
> > > > +     u32                     rev;
> > > > +     u8                      dual_link; /* single-link or dual-link */
> > > > +     u8                      data_format; /* VESA or JEIDA */
> > > > +};
> > > > +
> > > > +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> > > > +{
> > > > +     return container_of(b, struct tc_data, bridge);
> > > > +}
> > > > +
> > > > +static inline struct tc_data *connector_to_tc(struct drm_connector *c)
> > > > +{
> > > > +     return container_of(c, struct tc_data, connector);
> > > > +}
> > > > +
> > > > +static void tc_bridge_pre_enable(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +     struct device *dev = &tc->dsi->dev;
> > > > +     int ret;
> > > > +
> > > > +     ret = regulator_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > > +     if (ret < 0) {
> > > > +             dev_err(dev, "regulator enable failed, %d\n", ret);
> > > > +             return;
> > > > +     }
> > > > +     mdelay(10);
>
> You should consider usleep_range() instead of mdelay() for large delays.
>
> > > > +
> > > > +     gpiod_set_value(tc->stby_gpio, 0);
> > > > +     mdelay(10);
> > > > +
> > > > +     gpiod_set_value(tc->reset_gpio, 0);
> > > > +     ndelay(50);
> > > > +
> > > > +     drm_panel_prepare(tc->panel);
> > > > +}
> > > > +
> > > > +static void tc_bridge_disable(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +     struct device *dev = &tc->dsi->dev;
> > > > +     int ret;
> > > > +
> > > > +     ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > > +     if (ret < 0)
> > > > +             dev_err(dev, "regulator disable failed, %d\n", ret);
> > > > +     mdelay(10);
> > > > +
> > > > +     gpiod_set_value(tc->stby_gpio, 1);
> > > > +     mdelay(10);
> > > > +
> > > > +     gpiod_set_value(tc->reset_gpio, 1);
> > > > +     ndelay(50);
> > > > +
> > > > +     drm_panel_disable(tc->panel);
> > >
> > > I suspect the order should be different - ie reverse to the one pre_enable.
 - as per the datasheet it is not in reverse order

> > >
> > > Moreover since it reverts pre_enable it should be put into post_disable
> > > (except drm_panel_disable).
> > >
> > > > +}
> > > > +
> > > > +static void tc_bridge_post_disable(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +
> > > > +     drm_panel_unprepare(tc->panel);
> > > > +}
> > > > +
> > > > +#ifdef TC358775_DEBUG
> > > > +static u32 d2l_read(struct tc_data *tc, u16 reg)
> > > > +{
> > > > +     int ret;
> > > > +     u32 data;
> > > > +
> > > > +     ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
> > > > +     if (ret)
> > > > +             return ret;
> > > > +
> > > > +     pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
> > > > +
> > > > +     return data;
> > > > +}
> > > > +#endif
> > >
> > > I guess this leftover can be removed as well.
> > >
> > > > +
> > > > +static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
> > > > +{
> > > > +     int ret = 0;
> > > > +
> > > > +     ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
> > > > +
> > > > +#ifdef TC358775_DEBUG
> > > > +     d2l_read(tc, reg);
> > > > +#endif
> > > > +     return ret;
> > > > +}
> > > > +
> > > > +static void tc_bridge_enable(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +     int ret;
> > > > +     u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
> > > > +     u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
> > > > +     u32 val = 0;
> > > > +     struct drm_display_mode *mode;
> > > > +
> > > > +     mode = &bridge->encoder->crtc->state->adjusted_mode;
> > > > +
> > > > +     hbpr = 0;
> > > > +     hpw  = mode->hsync_end - mode->hsync_start;
> > > > +     vbpr = 0;
> > > > +     vpw  = mode->vsync_end - mode->vsync_start;
> > > > +
> > > > +     htime1 = (hbpr << 16) + hpw;
> > > > +     vtime1 = (vbpr << 16) + vpw;
> > > > +
> > > > +     hfpr = mode->hsync_start - mode->hdisplay;
> > > > +     hsize = mode->hdisplay;
> > > > +     vfpr = mode->vsync_start - mode->vdisplay;
> > > > +     vsize = mode->vdisplay;
> > > > +
> > > > +     htime2 = (hfpr << 16) + hsize;
> > > > +     vtime2 = (vfpr << 16) + vsize;
> > > > +
> > > > +     ret = regmap_read(tc->regmap, IDREG, &tc->rev);
> > > > +     if (ret) {
> > > > +             dev_err(tc->dev, "can not read device ID: %d\n", ret);
> > > > +             return;
> > > > +     }
> > > > +     pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
> > > > +
> > > > +     d2l_write(tc, SYSRST, 0x000000FF);
> > > > +     mdelay(30);
> > > > +
> > > > +     ret = regmap_register_patch(tc->regmap,
> > > > +                                 tc_fixed_registers,
> > > > +                                 ARRAY_SIZE(tc_fixed_registers));
> > > > +     if (ret)
> > > > +             return;
> > > > +
> > > > +     val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
> > > > +     d2l_write(tc, PPI_LANEENABLE, val);
> > > > +     d2l_write(tc, DSI_LANEENABLE, val);
> > > > +
> > > > +     d2l_write(tc, PPI_STARTPPI, 0x00000001);
> > > > +     d2l_write(tc, DSI_STARTDSI, 0x00000001);
> > > > +
> > > > +     val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
> >
> > Any suggestion how to set dynamic value for Vsyncdelay?
> >
> > > > +
> > > > +     if (tc->connector.display_info.bpc == 8) {/* RGB888 */
> > > > +             val |= TC358775_VPCTRL_OPXLFMT(1);
> > > > +             d2l_write(tc, VPCTRL, val);
> > > > +     } else {                                /* RGB666 */
> > > > +             val |= TC358775_VPCTRL_MSF(1);
> > > > +             d2l_write(tc, VPCTRL, val);
> > > > +     }
> > > > +
> > > > +     d2l_write(tc, HTIM1, htime1);
> > > > +     d2l_write(tc, VTIM1, vtime1);
> > > > +     d2l_write(tc, HTIM2, htime2);
> > > > +     d2l_write(tc, VTIM2, vtime2);
> > > > +
> > > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > > +     d2l_write(tc, SYSRST, 0x00000004);
> > > > +     d2l_write(tc, LVPHY0, 0x00040006);
> > > > +
> > > > +     if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */
> > > > +             ret = regmap_register_patch
> > > > +                     (tc->regmap,
> > > > +                      tc_vesa_data_format_registers,
> > > > +                      ARRAY_SIZE(tc_vesa_data_format_registers));
> > > > +             if (ret)
> > > > +                     return;
> > > > +     }
> > > > +
> > > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > > +
> > > > +     val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
> > > > +     if (tc->dual_link)
> > > > +             val |= TC358775_LVCFG_LVDLINK(1);
> > > > +
> > > > +     d2l_write(tc, LVCFG, val);
> > > > +
> > > > +     drm_panel_enable(tc->panel);
> > > > +}
> > > > +
> > > > +static int tc_connector_get_modes(struct drm_connector *connector)
> > > > +{
> > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > +     struct edid *edid;
> > > > +     unsigned int count;
> > > > +
> > > > +     if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
> > > > +             count = tc->panel->funcs->get_modes(tc->panel, connector);
> > > > +             if (count > 0)
> > > > +                     return count;
> > > > +     }
> > > > +
> > > > +     edid = drm_get_edid(connector, tc->i2c->adapter);
> > > > +     if (!edid)
> > > > +             return 0;
> > > > +
> > > > +     drm_connector_update_edid_property(connector, edid);
> > > > +     count = drm_add_edid_modes(connector, edid);
> > > > +     kfree(edid);
> > > > +
> > > > +     return count;
> > > > +}
> > > > +
> > > > +static int tc_connector_mode_valid(struct drm_connector *connector,
> > > > +                                struct drm_display_mode *mode)
> > > > +{
> > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > +
> > > > +     /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
> > > > +     if ((mode->clock > 135000 && tc->dual_link == 0) ||
> > > > +         (mode->clock > 270000 && tc->dual_link == 1))
> > > > +             return MODE_CLOCK_HIGH;
> > > > +
> > > > +     return MODE_OK;
> > > > +}
>
> This should be replaced by the bridge .mode_valid() operation, as it's
> related to the bridge, not the connector.
>
> > > > +
> > > > +static struct drm_encoder *
> > > > +tc_connector_best_encoder(struct drm_connector *connector)
> > > > +{
> > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > +
> > > > +     return tc->bridge.encoder;
> > > > +}
> > > > +
> > > > +static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
> > > > +     .get_modes = tc_connector_get_modes,
> > > > +     .mode_valid = tc_connector_mode_valid,
> > > > +     .best_encoder = tc_connector_best_encoder,
> > > > +};
> > > > +
> > > > +static const struct drm_connector_funcs tc_connector_funcs = {
> > > > +     .fill_modes = drm_helper_probe_single_connector_modes,
> > > > +     .destroy = drm_connector_cleanup,
> > > > +     .reset = drm_atomic_helper_connector_reset,
> > > > +     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > > > +     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > > > +};
> > > > +
> > > > +int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> > > > +{
> > > > +     u32 num_lanes;
> > > > +     u8 dual_link, data_format;
> > > > +
> > > > +     of_property_read_u8(np, "tc,dual-link", &dual_link);
> > > > +     of_property_read_u8(np, "tc,data-format", &data_format);
> > > > +     of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
> > > > +
> > > > +     if (num_lanes < 1 || num_lanes > 4)
> > > > +             return -EINVAL;
> > > > +
> > > > +     tc->num_dsi_lanes = num_lanes;
> > > > +     tc->dual_link = dual_link;
> > > > +     tc->data_format = data_format;
> > > > +
> > > > +     tc->host_node = of_graph_get_remote_node(np, 0, 0);
> > > > +     if (!tc->host_node)
> > > > +             return -ENODEV;
> > > > +
> > > > +     of_node_put(tc->host_node);
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +
> > > > +int tc358775_attach_dsi(struct tc_data *tc)
> > > > +{
> > > > +     struct device *dev = &tc->i2c->dev;
> > > > +     struct mipi_dsi_host *host;
> > > > +     struct mipi_dsi_device *dsi;
> > > > +     int ret = 0;
> > > > +     const struct mipi_dsi_device_info info = { .type = "tc358775",
> > > > +                                                     .channel = 0,
> > > > +                                                     .node = NULL,
> > > > +                                             };
> > > > +
> > > > +     host = of_find_mipi_dsi_host_by_node(tc->host_node);
> > > > +     if (!host) {
> > > > +             dev_err(dev, "failed to find dsi host\n");
> > > > +             return -EPROBE_DEFER;
> > > > +     }
> > > > +
> > > > +     dsi = mipi_dsi_device_register_full(host, &info);
> > > > +     if (IS_ERR(dsi)) {
> > > > +             dev_err(dev, "failed to create dsi device\n");
> > > > +             ret = PTR_ERR(dsi);
> > > > +             goto err_dsi_device;
> > > > +     }
> > > > +
> > > > +     tc->dsi = dsi;
> > > > +
> > > > +     dsi->lanes = tc->num_dsi_lanes;
> > > > +     dsi->format = MIPI_DSI_FMT_RGB888;
> > > > +     dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> > > > +
> > > > +     ret = mipi_dsi_attach(dsi);
> > > > +     if (ret < 0) {
> > > > +             dev_err(dev, "failed to attach dsi to host\n");
> > > > +             goto err_dsi_attach;
> > > > +     }
> > > > +
> > > > +     return 0;
> > > > +
> > > > +err_dsi_attach:
> > > > +     mipi_dsi_device_unregister(dsi);
> > > > +err_dsi_device:
> > > > +     return ret;
> > > > +}
> > > > +
> > > > +static int tc_bridge_attach(struct drm_bridge *bridge)
> > > > +{
> > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > +     struct drm_device *drm = bridge->dev;
> > > > +     int ret;
> > > > +
> > > > +     /* Create LVDS connector */
> > > > +     drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
> > > > +     ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
> > > > +                              DRM_MODE_CONNECTOR_LVDS);
> > > > +     if (ret)
> > > > +             return ret;
> > > > +
> > > > +     if (tc->panel)
> > > > +             drm_panel_attach(tc->panel, &tc->connector);
> > > > +
> > > > +     drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
> > > > +
> > > > +     ret = tc358775_attach_dsi(tc);
> > >
> > > Ignored retval.
> > >
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +
> > > > +static const struct drm_bridge_funcs tc_bridge_funcs = {
> > > > +     .attach = tc_bridge_attach,
> > > > +     .pre_enable = tc_bridge_pre_enable,
> > > > +     .enable = tc_bridge_enable,
> > > > +     .disable = tc_bridge_disable,
> > > > +     .post_disable = tc_bridge_post_disable,
> > > > +};
> > > > +
> > > > +static const struct regmap_config tc_regmap_config = {
> > > > +     .name = "tc358775",
> > > > +     .reg_bits = 16,
> > > > +     .val_bits = 32,
> > > > +     .reg_stride = 4,
> > > > +     .max_register = 0x05A8,
> > > > +     .cache_type = REGCACHE_RBTREE,
> > > > +     .reg_format_endian = REGMAP_ENDIAN_BIG,
> > > > +     .val_format_endian = REGMAP_ENDIAN_LITTLE,
> > > > +};
> > > > +
> > > > +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
> > > > +{
> > > > +     struct device *dev = &client->dev;
> > > > +     struct tc_data *tc;
> > > > +     int ret;
> > > > +     unsigned int i;
> > > > +
> > > > +     tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> > > > +     if (!tc)
> > > > +             return -ENOMEM;
> > > > +
> > > > +     tc->dev = dev;
> > > > +     tc->i2c = client;
> > > > +     tc->status = connector_status_connected;
> > > > +
> > > > +     /* port@1 is the output port */
> > > > +     ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
> > > > +     if (ret && ret != -ENODEV)
> > > > +             return ret;
>
> You should support cases where the next device is a bridge. I recommand
> wrapping the panel in a drm_panel_bridge with drm_panel_bridge_add(),
> and then handling the next component as a bridge in all code paths. This
> will allow removing manual enable/disable of panels above, as bridge
> chaining is handled automatically. drm_panel_bridge creates a
> drm_connector, so you can drop your manual connector implementation
> here, simplifying the code.
>
i am not clear on this drm_panel_bridge_add() usage, please
clarify/any reference would be helpful.
> > > > +
> > > > +     ret = tc358775_parse_dt(dev->of_node, tc);
> > > > +     if (ret)
> > > > +             return ret;
> > > > +
> > > > +     for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
> > > > +             tc->supplies[i].supply = regulator_names[i];
> > > > +
> > > > +     ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
> > > > +                                   tc->supplies);
> > > > +     if (ret < 0)
> > > > +             dev_err(dev, "failed to init regulator, ret=%d\n", ret);
> > > > +
> > > > +     tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> > > > +     if (IS_ERR(tc->stby_gpio)) {
> > > > +             ret = PTR_ERR(tc->stby_gpio);
> > > > +             dev_err(dev, "cannot get stby-gpio %d\n", ret);
> > > > +             return ret;
> > > > +     }
> > > > +
> > > > +     tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > > > +     if (IS_ERR(tc->reset_gpio)) {
> > > > +             ret = PTR_ERR(tc->reset_gpio);
> > > > +             dev_err(dev, "cannot get reset-gpios %d\n", ret);
> > > > +             return ret;
> > > > +     }
> > > > +
> > > > +     tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
> > > > +     if (IS_ERR(tc->regmap)) {
> > > > +             ret = PTR_ERR(tc->regmap);
> > > > +             dev_err(dev, "Failed to initialize regmap: %d\n", ret);
> > > > +             return ret;
> > > > +     }
> > > > +
> > > > +     tc->bridge.funcs = &tc_bridge_funcs;
> > > > +     tc->bridge.of_node = dev->of_node;
> > > > +     drm_bridge_add(&tc->bridge);
> > > > +
> > > > +     i2c_set_clientdata(client, tc);
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +
> > > > +static int tc_remove(struct i2c_client *client)
> > > > +{
> > > > +     struct tc_data *tc = i2c_get_clientdata(client);
> > > > +
> > > > +     drm_bridge_remove(&tc->bridge);
> > > > +
> > > > +     return 0;
> > > > +}
> > > > +
> > > > +static const struct i2c_device_id tc358775_i2c_ids[] = {
> > > > +     { "tc358775", 0 },
> > > > +     { }
> > > > +};
> > > > +MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
> > > > +
> > > > +static const struct of_device_id tc358775_of_ids[] = {
> > > > +     { .compatible = "toshiba,tc358775", },
> > > > +     { }
> > > > +};
> > > > +MODULE_DEVICE_TABLE(of, tc358775_of_ids);
> > > > +
> > > > +static struct i2c_driver tc358775_driver = {
> > > > +     .driver = {
> > > > +             .name = "tc358775",
> > > > +             .of_match_table = tc358775_of_ids,
> > > > +     },
> > > > +     .id_table = tc358775_i2c_ids,
> > > > +     .probe = tc_probe,
> > > > +     .remove = tc_remove,
> > > > +};
> > > > +module_i2c_driver(tc358775_driver);
> > > > +
> > > > +MODULE_AUTHOR("Vinay Simha BN <vinaysimha@inforcecomputing.com>");
> > > > +MODULE_DESCRIPTION("tc358775 LVDS encoder driver");
> > >
> > > maybe  better:
> > >
> > > tc358775 DSI/LVDS bridge driver
> > >
> > > > +MODULE_LICENSE("GPL v2");
>
> --
> Regards,
>
> Laurent Pinchart



-- 
regards,
vinaysimha


^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH] display/bridge: dsi2lvds tc358775 driver
  2020-03-11 10:00         ` Vinay Simha B N
  2020-03-11 10:00           ` Vinay Simha B N
@ 2020-03-12 14:31           ` Laurent Pinchart
  2020-03-15 15:30             ` Vinay Simha B N
  1 sibling, 1 reply; 8+ messages in thread
From: Laurent Pinchart @ 2020-03-12 14:31 UTC (permalink / raw)
  To: Vinay Simha B N
  Cc: Andrzej Hajda,
	open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	Jernej Skrabec, Neil Armstrong, David Airlie, Jonas Karlman,
	open list, open list:DRM DRIVERS, Rob Herring, m.purski

Hi Vinay,

On Wed, Mar 11, 2020 at 03:30:48PM +0530, Vinay Simha B N wrote:
> Laurent Pinchart,
> 
> if we want to set to jeida-18 data mapping,
> do we need to set DATA3 with "Logic 0" LVI_L0 ?

If the TC358775 supports setting unused outputs to a fixed logic level I
think that's best, yes.

> Please see reply inline.

Same :-)

> >
> > On Fri, Mar 06, 2020 at 06:06:36PM +0530, Vinay Simha B N wrote:
> > > hi andrzej,
> > >
> > > I had a doubt In the tc358764 driver,VP_CTRL, VP_CTRL_VSDELAY(15) is
> > > hardcoded to 15, but this has to be dynamic based on the resolution of
> > > panel used?
> > >
> > > Please see the reply inline.
> > >
> > > On Tue, Mar 3, 2020 at 8:39 PM Andrzej Hajda <a.hajda@samsung.com> wrote:
> > > > On 27.02.2020 15:03, Vinay Simha BN wrote:
> > > > > dsi2lvds tc358775 bridge driver added
> > > > > Tested in apq8016, ifc6309 board and panel
> > > > > auo,b101xtn01
> > > >
> > > > Just FYI, there exists already TC358764/5 driver for similar hw, but
> > > > controlled via DSI bus.
> > >
> > > There is not much difference between these two chips, but still the
> > > dsi read access for 775 does not works.
> > > TC358764/5 - 800Mbps per lane, 3.2Gbps
> > > TC358775 - 1Gbps per lane, 4Gbps.
> > >
> > > tc358775 chip details -
> > > https://download.t-firefly.com/product/RK3399/Docs/Chip%20Specifications/TC358774XBG_75XBG_V1%204nm.pdf
> > > I am able to configure the tc358775 chip by i2c, but from dsi it fails
> > > i tried accessing the tc358775 chip by dsi using apq8016-qcom , but it
> > > fails to read the chip id itself.
> > >
> > > Please suggest if you any inputs for this issue.
> > >
> > > https://github.com/vinaysimhabn/kernel-msm/commits/5.6.0-rc3-dsi2lvds-dsi
> > >
> > > [    4.582405] tc358764 1a98000.dsi.0: read: 1408, addr: 0
> > > [    4.582426] tc358764 1a98000.dsi.0: ID: 0x0
> > > [    4.582451] tc358764 1a98000.dsi.0: error initializing bridge (-22)
> > >
> > > [    4.796220] dsi_cmds2buf_tx: cmd dma tx failed, type=0x24, data0=0x80, len=4
> > > [    4.796244] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > > [    4.796266] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > > [    4.796288] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > > [    4.796310] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > > [    4.796319] msm_dsi_host_cmd_rx:Invalid response cmd
> > >
> > > > > Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
> > > > > ---
> > > > >  .../bindings/display/bridge/toshiba,tc358775.txt   | 106 ++++
> > > >
> > > > Bindings should be in separate patch and in yaml format.
> > > >
> > > > >  drivers/gpu/drm/bridge/Kconfig                     |  10 +
> > > > >  drivers/gpu/drm/bridge/Makefile                    |   1 +
> > > > >  drivers/gpu/drm/bridge/tc358775.c                  | 687 +++++++++++++++++++++
> > > > >  4 files changed, 804 insertions(+)
> > > > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > >  create mode 100644 drivers/gpu/drm/bridge/tc358775.c
> > > > >
> > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > > new file mode 100644
> > > > > index 0000000..c4c364d
> > > > > --- /dev/null
> > > > > +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > > @@ -0,0 +1,106 @@
> > > > > +Toshiba TC358775 DSI to LVDS bridge bindings
> > > > > +
> > > > > +Required properties:
> > > > > + - compatible: "toshiba,tc358775"
> > > > > + - reg: i2c address of the bridge, 0x0f
> > > > > + - tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
> > > > > +  be one of 1, 2, 3 or 4.
> > > > > + - tc, dual-link : To configure the LVDS transmitter either
> > > > > +  as single-link or dual-link.
> > > > > + - tc, data-format: To configure the data formats
> > > > > +   0 for VESA standard, 1 for JEIDA standard
> > > >
> > > > IMO, three properties above should be received from downstream device in
> > > > runtime, not hardcoded into DT, however I am not sure if frameworks
> > > > support it.
> >
> > I assume Andrzej meant upstream device for the tc,dsi-lanes property.
> > This should be exposed through the data-lanes property as described in
> > media/video-interface.txt.
> 
> data-lanes mainly used for the interfaces of the hardware.
> example : dsi, csi

Correct, so please use it to replace tc,dsi-lanes :-)

> In general panels/bridges either it will be hardcoded by setting in the
> panel driver like this dsi->lanes = 4;
> bridge  -> dsi2hdmi display/bridge/adi,adv7511.txt it wil be set by
> adi,dsi-lanes

That's a mistake in the bindings, let's not repeat it.

> > The tc,dual-link property should be replaced by exposing two port nodes,
> > one for each link, and connecting them appropriately. See
> > display/bridge/thine,thc63lvd1024.txt for an example of DT bindings on
> > the LVDS receiver side, and drivers/gpu/drm/rcar-du/rcar_lvds.c for an
> > example implementation on the LVDS transmitter side.
> 
> Can we add two port nodes though it can give only 1 output? when
> higher resolution panel used dual_link is enabled in LVCFG

Sure, you will have three ports in total, one for the DSI intput, and
two for the two LVDS outputs. A port node maps to a physical connection,
and there's nothing wrong with having two port nodes to describe the
dual-link LVDS output.

> > The tc,data-format property should be replaced by the data-mapping
> > property on the downstream LVDS device (see display/panel/lvds.yaml) and
> > queried at runtime.
> >
> > > > > + - vdd-supply: 1.2V LVDS Power Supply
> > > > > + - vddio-supply: 1.8V IO Power Supply
> > > > > + - stby-gpios: Standby pin, Low active
> > > > > + - reset-gpios: Hardware reset,      Low active
> > > > > +
> > > > > +Required nodes:
> > > > > +
> > > > > +The TC358775 has two ports. Their connections are modelled using the OF
> > > > > +graph bindings specified in Documentation/devicetree/bindings/graph.txt.
> > > > > +
> > > > > +- Video port 0 for the DSI input. The remote endpoint phandle should be a
> > > > > +     reference to a valid mipi_dsi_host device node.
> > > > > +- Video port 1 for the LVDS output.
> > > > > +
> > > > > +Example:
> > > > > +
> > > > > +     i2c@78b8000 {
> > > > > +             /* On High speed expansion */
> > > > > +             label = "HS-I2C2";
> > > > > +             status = "okay";
> > > > > +
> > > > > +             tc_bridge: bridge@f {
> > > > > +                     status = "okay";
> > > > > +
> > > > > +                     compatible = "toshiba,tc358775";
> > > > > +                     reg = <0x0f>;
> > > > > +
> > > > > +                     tc,dsi-lanes = <4>;
> > > > > +                     tc,dual-link = <0>;
> > > > > +                     tc,data-format = <1>;
> > > > > +
> > > > > +                     vdd-supply = <&pm8916_l2>;
> > > > > +                     vddio-supply = <&pm8916_l6>;
> > > > > +
> > > > > +                     stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
> > > > > +                     reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
> > > > > +
> > > > > +                     ports {
> > > > > +                             #address-cells = <1>;
> > > > > +                             #size-cells = <0>;
> > > > > +
> > > > > +                             port@0 {
> > > > > +                                     reg = <0>;
> > > > > +                                     d2l_in: endpoint {
> > > > > +                                             remote-endpoint = <&dsi0_out>;
> > > > > +                                     };
> > > > > +                             };
> > > > > +
> > > > > +                             port@1 {
> > > > > +                                     reg = <1>;
> > > > > +                                     d2l_out: endpoint {
> > > > > +                                             remote-endpoint = <&panel_in>;
> > > > > +                                     };
> > > > > +                             };
> > > > > +                     };
> > > > > +             };
> > > > > +     };
> > > > > +
> > > > > +     panel: auo,b101xtn01 {
> > > > > +                     status = "okay";
> > > > > +                     compatible = "auo,b101xtn01";
> > > > > +                     power-supply = <&pm8916_l14>;
> > > > > +
> > > > > +                     port {
> > > > > +                             panel_in: endpoint {
> > > > > +                                     remote-endpoint = <&d2l_out>;
> > > > > +                             };
> > > > > +                     };
> > > > > +     };
> > > > > +
> > > > > +     mdss@1a00000 {
> > > > > +             status = "okay";
> > > > > +
> > > > > +             mdp@1a01000 {
> > > > > +                     status = "okay";
> > > > > +             };
> > > > > +
> > > > > +             dsi@1a98000 {
> > > > > +                     status = "okay";
> > > > > +                     ..
> > > > > +                     ports {
> > > > > +                             port@1 {
> > > > > +                                     dsi0_out: endpoint {
> > > > > +                                             remote-endpoint = <&d2l_in>;
> > > > > +                                             data-lanes = <0 1 2 3>;
> > > > > +                                     };
> > > > > +                             };
> > > > > +                     };
> > > > > +             };
> > > > > +
> > > > > +             dsi-phy@1a98300 {
> > > > > +                     status = "okay";
> > > > > +                     ..
> > > > > +             };
> > > > > +     };
> > > > > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > > > > index 8397bf7..d5528fa 100644
> > > > > --- a/drivers/gpu/drm/bridge/Kconfig
> > > > > +++ b/drivers/gpu/drm/bridge/Kconfig
> > > > > @@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
> > > > >       ---help---
> > > > >         Toshiba TC358767 eDP bridge chip driver.
> > > > >
> > > > > +config DRM_TOSHIBA_TC358775
> > > > > +        tristate "Toshiba TC358775 LVDS bridge"
> > > > > +        depends on OF
> > > > > +        select DRM_KMS_HELPER
> > > > > +        select REGMAP_I2C
> > > > > +        select DRM_PANEL
> > > > > +     select DRM_MIPI_DSI
> > > > > +        ---help---
> > > > > +          Toshiba TC358775 LVDS bridge chip driver.
> > > > > +
> > > > >  config DRM_TI_TFP410
> > > > >       tristate "TI TFP410 DVI/HDMI bridge"
> > > > >       depends on OF
> > > > > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> > > > > index 1eb5376..9b2c512 100644
> > > > > --- a/drivers/gpu/drm/bridge/Makefile
> > > > > +++ b/drivers/gpu/drm/bridge/Makefile
> > > > > @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
> > > > >  obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> > > > >  obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
> > > > >  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> > > > > +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
> > > > >  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> > > > >  obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
> > > > >  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> > > > > diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> > > > > new file mode 100644
> > > > > index 0000000..3db0f49
> > > > > --- /dev/null
> > > > > +++ b/drivers/gpu/drm/bridge/tc358775.c
> > > > > @@ -0,0 +1,687 @@
> > > > > +// SPDX-License-Identifier: GPL-2.0
> > > > > +/*
> > > > > + * tc358775 DSI to LVDS bridge driver
> > > > > + *
> > > > > + * Copyright (C) 2020 InforceComputing
> > > > > + * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
> > > > > + *
> > > > > + * This program is free software; you can redistribute it and/or modify
> > > > > + * it under the terms of the GNU General Public License as published by
> > > > > + * the Free Software Foundation; either version 2 of the License, or
> > > > > + * (at your option) any later version.
> > > > > + *
> > > > > + * This program is distributed in the hope that it will be useful,
> > > > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > > > > + * GNU General Public License for more details.
> > > >
> > > > You can drop these statements, SPDX identifier is enough.
> > > >
> > > > > + */
> > > > > +
> > > > > +/* #define DEBUG */
> > > > > +/* #define TC358775_DEBUG */
> > > >
> > > > Please remove these development leftovers.
> > > >
> > > > > +#include <linux/clk.h>
> > > > > +#include <linux/device.h>
> > > > > +#include <linux/gpio/consumer.h>
> > > > > +#include <linux/i2c.h>
> > > > > +#include <linux/kernel.h>
> > > > > +#include <linux/module.h>
> > > > > +#include <linux/regmap.h>
> > > > > +#include <linux/slab.h>
> > > > > +#include <linux/regulator/consumer.h>
> > > > Alphabetic order.
> > > > > +
> > > > > +#include <drm/drm_mipi_dsi.h>
> > > > > +#include <drm/drm_atomic_helper.h>
> > > > > +#include <drm/drm_crtc_helper.h>
> > > > > +#include <drm/drm_dp_helper.h>
> > > > > +#include <drm/drm_of.h>
> > > > > +#include <drm/drm_panel.h>
> > > > > +#include <drm/drm_bridge.h>
> > > > > +#include <drm/drm_probe_helper.h>
> > > > ditto
> > > > > +
> > > > > +/* Registers */
> > > > > +
> > > > > +/* DSI D-PHY Layer Registers */
> > > > > +#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
> > > > > +#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
> > > > > +#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
> > > > > +#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
> > > > > +#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
> > > > > +#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
> > > > > +#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
> > > > > +#define CLW_CNTRL       0x0040  /* Clock Lane Control */
> > > > > +#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
> > > > > +#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
> > > > > +#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
> > > > > +#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
> > > > > +#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
> > > > > +
> > > > > +/* DSI PPI Layer Registers */
> > > > > +#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
> > > > > +#define PPI_BUSYPPI     0x0108
> > > > > +#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
> > > > > +#define PPI_LPTXTIMECNT 0x0114
> > > > > +#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
> > > > > +#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
> > > > > +
> > > > > +/* Analog timer function enable */
> > > > > +#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
> > > > > +#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
> > > > > +#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
> > > > > +#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
> > > > > +#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
> > > > > +#define PPI_D0S_CLRSIPOCOUNT    0x0164
> > > > > +
> > > > > +#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
> > > > > +#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
> > > > > +#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
> > > > > +
> > > > > +#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
> > > > > +#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
> > > > > +#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
> > > > > +#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
> > > > > +#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
> > > > > +#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
> > > > > +#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
> > > > > +#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
> > > > > +#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
> > > > > +#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
> > > > > +#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
> > > > > +#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
> > > > > +#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
> > > > > +#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
> > > > > +#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
> > > > > +
> > > > > +#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
> > > > > +#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
> > > > > +#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
> > > > > +#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
> > > > > +#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
> > > > > +#define DSI_BUSYDSI     0x0208
> > > > > +#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
> > > > > +#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
> > > > > +#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
> > > > > +
> > > > > +#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
> > > > > +#define DSI_INTMASK     0x0224  /* Interrupt Mask */
> > > > > +#define DSI_INTCLR      0x0228  /* Interrupt Clear */
> > > > > +#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
> > > > > +
> > > > > +#define DSIERRCNT       0x0300  /* DSI Error Count */
> > > > > +#define APLCTRL         0x0400  /* Application Layer Control */
> > > > > +#define RDPKTLN         0x0404  /* Command Read Packet Length */
> > > > > +
> > > > > +#define VPCTRL          0x0450  /* Video Path Control */
> > > > > +#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
> > > > > +#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
> > > > > +#define VTIM1           0x045C  /* Vertical Timing Control 1 */
> > > > > +#define VTIM2           0x0460  /* Vertical Timing Control 2 */
> > > > > +#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
> > > > > +
> > > > > +/* Mux Input Select for LVDS LINK Input */
> > > > > +#define LVMX0003        0x0480  /* Bit 0 to 3 */
> > > > > +#define LVMX0407        0x0484  /* Bit 4 to 7 */
> > > > > +#define LVMX0811        0x0488  /* Bit 8 to 11 */
> > > > > +#define LVMX1215        0x048C  /* Bit 12 to 15 */
> > > > > +#define LVMX1619        0x0490  /* Bit 16 to 19 */
> > > > > +#define LVMX2023        0x0494  /* Bit 20 to 23 */
> > > > > +#define LVMX2427        0x0498  /* Bit 24 to 27 */
> > > > > +
> > > > > +#define LVCFG           0x049C  /* LVDS Configuration  */
> > > > > +#define LVPHY0          0x04A0  /* LVDS PHY 0 */
> > > > > +#define LVPHY1          0x04A4  /* LVDS PHY 1 */
> > > > > +#define SYSSTAT         0x0500  /* System Status  */
> > > > > +#define SYSRST          0x0504  /* System Reset  */
> > > > > +/* GPIO Registers */
> > > > > +#define GPIOC           0x0520  /* GPIO Control  */
> > > > > +#define GPIOO           0x0524  /* GPIO Output  */
> > > > > +#define GPIOI           0x0528  /* GPIO Input  */
> > > > > +
> > > > > +/* I2C Registers */
> > > > > +#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
> > > > > +#define I2CMADDR        0x0544  /* I2C Master Addressing */
> > > > > +#define WDATAQ          0x0548  /* Write Data Queue */
> > > > > +#define RDATAQ          0x054C  /* Read Data Queue */
> > > > > +
> > > > > +/* Chip ID and Revision ID Register */
> > > > > +#define IDREG           0x0580
> > > > > +
> > > > > +#define TC358775XBG_ID  0x00007500
> > > > > +
> > > > > +/* Debug Registers */
> > > > > +#define DEBUG00         0x05A0  /* Debug */
> > > > > +#define DEBUG01         0x05A4  /* LVDS Data */
> > > > > +
> > > > > +#define DSI_CLEN_BIT         BIT(0)
> > > > > +#define DIVIDE_BY_3          3 /* PCLK=DCLK/3 */
> > > > > +#define LVCFG_LVEN_BIT               BIT(0)
> > > > > +
> > > > > +#define L0EN BIT(1)
> > > > > +
> > > > > +#define TC358775_VPCTRL_VSDELAY__MASK        0x3FF00000
> > > > > +#define TC358775_VPCTRL_VSDELAY__SHIFT       20
> > > > > +static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)
> > > >
> > > >
> > > > Use u32 here and below, unit32_t is mainly for userspace interactions.
> > > >
> > > >
> > > > > +{
> > > > > +     return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
> > > > > +                     TC358775_VPCTRL_VSDELAY__MASK;
> > > > > +}
> > > > > +
> > > > > +#define TC358775_VPCTRL_OPXLFMT__MASK        0x00000100
> > > > > +#define TC358775_VPCTRL_OPXLFMT__SHIFT       8
> > > > > +static inline uint32_t TC358775_VPCTRL_OPXLFMT(uint32_t val)
> > > > > +{
> > > > > +     return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
> > > > > +                     TC358775_VPCTRL_OPXLFMT__MASK;
> > > > > +}
> > > > > +
> > > > > +#define TC358775_VPCTRL_MSF__MASK    0x00000001
> > > > > +#define TC358775_VPCTRL_MSF__SHIFT   0
> > > > > +static inline uint32_t TC358775_VPCTRL_MSF(uint32_t val)
> > > > > +{
> > > > > +     return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
> > > > > +                     TC358775_VPCTRL_MSF__MASK;
> > > > > +}
> > > > > +
> > > > > +#define TC358775_LVCFG_PCLKDIV__MASK 0x000000f0
> > > > > +#define TC358775_LVCFG_PCLKDIV__SHIFT        4
> > > > > +static inline uint32_t TC358775_LVCFG_PCLKDIV(uint32_t val)
> > > > > +{
> > > > > +     return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
> > > > > +                     TC358775_LVCFG_PCLKDIV__MASK;
> > > > > +}
> > > > > +
> > > > > +#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
> > > > > +#define TC358775_LVCFG_LVDLINK__SHIFT                        0
> > > > > +static inline uint32_t TC358775_LVCFG_LVDLINK(uint32_t val)
> > > > > +{
> > > > > +     return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
> > > > > +                     TC358775_LVCFG_LVDLINK__MASK;
> > > > > +}
> > > > > +
> > > > > +static const struct reg_sequence tc_fixed_registers[] = {
> > > > > +     { 0x013C, 0x00040006 },
> > > > > +     { 0x0114, 0x00000004 },
> > > > > +     { 0x0164, 0x00000003 },
> > > > > +     { 0x0168, 0x00000003 },
> > > > > +     { 0x016C, 0x00000003 },
> > > > > +     { 0x0170, 0x00000003 },
> > > >
> > > > use macros instead of magic numbers.
> > > >
> > > > > +};
> > > > > +
> > > > > +static const struct reg_sequence tc_vesa_data_format_registers[] = {
> > > > > +     { 0x0480, 0x03020100 },
> > > > > +     { 0x0484, 0x08050704 },
> > > > > +     { 0x0488, 0x0F0E0A09 },
> > > > > +     { 0x048C, 0x100D0C0B },
> > > > > +     { 0x0490, 0x12111716 },
> > > > > +     { 0x0494, 0x1B151413 },
> > > > > +     { 0x0498, 0x061A1918 },
> > > > ditto
> > > > > +};
> > > > > +
> > > > > +static const char * const regulator_names[] = {
> > > > > +     "vdd",
> > > > > +     "vddio"
> > > > > +};
> > > > > +
> > > > > +struct tc_data {
> > > > > +     struct i2c_client       *i2c;
> > > > > +
> > > > > +     struct device           *dev;
> > > > > +     struct regmap           *regmap;
> > > > > +
> > > > > +     struct drm_bridge       bridge;
> > > > > +     struct drm_connector    connector;
> > > > > +     struct drm_panel        *panel;
> > > > > +
> > > > > +     enum drm_connector_status status;
> > > > unused field
> status used in tc->status = connector_status_connected;
> > > > > +     struct device_node *host_node;
> > > > > +     struct mipi_dsi_device *dsi;
> > > > > +     u8 num_dsi_lanes;
> > > > > +
> > > > > +     struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> > > > > +     struct gpio_desc        *reset_gpio;
> > > > > +     struct gpio_desc        *stby_gpio;
> > > > > +     u32                     rev;
> > > > > +     u8                      dual_link; /* single-link or dual-link */
> > > > > +     u8                      data_format; /* VESA or JEIDA */
> > > > > +};
> > > > > +
> > > > > +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> > > > > +{
> > > > > +     return container_of(b, struct tc_data, bridge);
> > > > > +}
> > > > > +
> > > > > +static inline struct tc_data *connector_to_tc(struct drm_connector *c)
> > > > > +{
> > > > > +     return container_of(c, struct tc_data, connector);
> > > > > +}
> > > > > +
> > > > > +static void tc_bridge_pre_enable(struct drm_bridge *bridge)
> > > > > +{
> > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > +     struct device *dev = &tc->dsi->dev;
> > > > > +     int ret;
> > > > > +
> > > > > +     ret = regulator_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > > > +     if (ret < 0) {
> > > > > +             dev_err(dev, "regulator enable failed, %d\n", ret);
> > > > > +             return;
> > > > > +     }
> > > > > +     mdelay(10);
> >
> > You should consider usleep_range() instead of mdelay() for large delays.
> >
> > > > > +
> > > > > +     gpiod_set_value(tc->stby_gpio, 0);
> > > > > +     mdelay(10);
> > > > > +
> > > > > +     gpiod_set_value(tc->reset_gpio, 0);
> > > > > +     ndelay(50);
> > > > > +
> > > > > +     drm_panel_prepare(tc->panel);
> > > > > +}
> > > > > +
> > > > > +static void tc_bridge_disable(struct drm_bridge *bridge)
> > > > > +{
> > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > +     struct device *dev = &tc->dsi->dev;
> > > > > +     int ret;
> > > > > +
> > > > > +     ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > > > +     if (ret < 0)
> > > > > +             dev_err(dev, "regulator disable failed, %d\n", ret);
> > > > > +     mdelay(10);
> > > > > +
> > > > > +     gpiod_set_value(tc->stby_gpio, 1);
> > > > > +     mdelay(10);
> > > > > +
> > > > > +     gpiod_set_value(tc->reset_gpio, 1);
> > > > > +     ndelay(50);
> > > > > +
> > > > > +     drm_panel_disable(tc->panel);
> > > >
> > > > I suspect the order should be different - ie reverse to the one pre_enable.
>  - as per the datasheet it is not in reverse order
> 
> > > >
> > > > Moreover since it reverts pre_enable it should be put into post_disable
> > > > (except drm_panel_disable).
> > > >
> > > > > +}
> > > > > +
> > > > > +static void tc_bridge_post_disable(struct drm_bridge *bridge)
> > > > > +{
> > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > +
> > > > > +     drm_panel_unprepare(tc->panel);
> > > > > +}
> > > > > +
> > > > > +#ifdef TC358775_DEBUG
> > > > > +static u32 d2l_read(struct tc_data *tc, u16 reg)
> > > > > +{
> > > > > +     int ret;
> > > > > +     u32 data;
> > > > > +
> > > > > +     ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
> > > > > +     if (ret)
> > > > > +             return ret;
> > > > > +
> > > > > +     pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
> > > > > +
> > > > > +     return data;
> > > > > +}
> > > > > +#endif
> > > >
> > > > I guess this leftover can be removed as well.
> > > >
> > > > > +
> > > > > +static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
> > > > > +{
> > > > > +     int ret = 0;
> > > > > +
> > > > > +     ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
> > > > > +
> > > > > +#ifdef TC358775_DEBUG
> > > > > +     d2l_read(tc, reg);
> > > > > +#endif
> > > > > +     return ret;
> > > > > +}
> > > > > +
> > > > > +static void tc_bridge_enable(struct drm_bridge *bridge)
> > > > > +{
> > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > +     int ret;
> > > > > +     u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
> > > > > +     u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
> > > > > +     u32 val = 0;
> > > > > +     struct drm_display_mode *mode;
> > > > > +
> > > > > +     mode = &bridge->encoder->crtc->state->adjusted_mode;
> > > > > +
> > > > > +     hbpr = 0;
> > > > > +     hpw  = mode->hsync_end - mode->hsync_start;
> > > > > +     vbpr = 0;
> > > > > +     vpw  = mode->vsync_end - mode->vsync_start;
> > > > > +
> > > > > +     htime1 = (hbpr << 16) + hpw;
> > > > > +     vtime1 = (vbpr << 16) + vpw;
> > > > > +
> > > > > +     hfpr = mode->hsync_start - mode->hdisplay;
> > > > > +     hsize = mode->hdisplay;
> > > > > +     vfpr = mode->vsync_start - mode->vdisplay;
> > > > > +     vsize = mode->vdisplay;
> > > > > +
> > > > > +     htime2 = (hfpr << 16) + hsize;
> > > > > +     vtime2 = (vfpr << 16) + vsize;
> > > > > +
> > > > > +     ret = regmap_read(tc->regmap, IDREG, &tc->rev);
> > > > > +     if (ret) {
> > > > > +             dev_err(tc->dev, "can not read device ID: %d\n", ret);
> > > > > +             return;
> > > > > +     }
> > > > > +     pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
> > > > > +
> > > > > +     d2l_write(tc, SYSRST, 0x000000FF);
> > > > > +     mdelay(30);
> > > > > +
> > > > > +     ret = regmap_register_patch(tc->regmap,
> > > > > +                                 tc_fixed_registers,
> > > > > +                                 ARRAY_SIZE(tc_fixed_registers));
> > > > > +     if (ret)
> > > > > +             return;
> > > > > +
> > > > > +     val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
> > > > > +     d2l_write(tc, PPI_LANEENABLE, val);
> > > > > +     d2l_write(tc, DSI_LANEENABLE, val);
> > > > > +
> > > > > +     d2l_write(tc, PPI_STARTPPI, 0x00000001);
> > > > > +     d2l_write(tc, DSI_STARTDSI, 0x00000001);
> > > > > +
> > > > > +     val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
> > >
> > > Any suggestion how to set dynamic value for Vsyncdelay?
> > >
> > > > > +
> > > > > +     if (tc->connector.display_info.bpc == 8) {/* RGB888 */
> > > > > +             val |= TC358775_VPCTRL_OPXLFMT(1);
> > > > > +             d2l_write(tc, VPCTRL, val);
> > > > > +     } else {                                /* RGB666 */
> > > > > +             val |= TC358775_VPCTRL_MSF(1);
> > > > > +             d2l_write(tc, VPCTRL, val);
> > > > > +     }
> > > > > +
> > > > > +     d2l_write(tc, HTIM1, htime1);
> > > > > +     d2l_write(tc, VTIM1, vtime1);
> > > > > +     d2l_write(tc, HTIM2, htime2);
> > > > > +     d2l_write(tc, VTIM2, vtime2);
> > > > > +
> > > > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > > > +     d2l_write(tc, SYSRST, 0x00000004);
> > > > > +     d2l_write(tc, LVPHY0, 0x00040006);
> > > > > +
> > > > > +     if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */
> > > > > +             ret = regmap_register_patch
> > > > > +                     (tc->regmap,
> > > > > +                      tc_vesa_data_format_registers,
> > > > > +                      ARRAY_SIZE(tc_vesa_data_format_registers));
> > > > > +             if (ret)
> > > > > +                     return;
> > > > > +     }
> > > > > +
> > > > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > > > +
> > > > > +     val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
> > > > > +     if (tc->dual_link)
> > > > > +             val |= TC358775_LVCFG_LVDLINK(1);
> > > > > +
> > > > > +     d2l_write(tc, LVCFG, val);
> > > > > +
> > > > > +     drm_panel_enable(tc->panel);
> > > > > +}
> > > > > +
> > > > > +static int tc_connector_get_modes(struct drm_connector *connector)
> > > > > +{
> > > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > > +     struct edid *edid;
> > > > > +     unsigned int count;
> > > > > +
> > > > > +     if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
> > > > > +             count = tc->panel->funcs->get_modes(tc->panel, connector);
> > > > > +             if (count > 0)
> > > > > +                     return count;
> > > > > +     }
> > > > > +
> > > > > +     edid = drm_get_edid(connector, tc->i2c->adapter);
> > > > > +     if (!edid)
> > > > > +             return 0;
> > > > > +
> > > > > +     drm_connector_update_edid_property(connector, edid);
> > > > > +     count = drm_add_edid_modes(connector, edid);
> > > > > +     kfree(edid);
> > > > > +
> > > > > +     return count;
> > > > > +}
> > > > > +
> > > > > +static int tc_connector_mode_valid(struct drm_connector *connector,
> > > > > +                                struct drm_display_mode *mode)
> > > > > +{
> > > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > > +
> > > > > +     /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
> > > > > +     if ((mode->clock > 135000 && tc->dual_link == 0) ||
> > > > > +         (mode->clock > 270000 && tc->dual_link == 1))
> > > > > +             return MODE_CLOCK_HIGH;
> > > > > +
> > > > > +     return MODE_OK;
> > > > > +}
> >
> > This should be replaced by the bridge .mode_valid() operation, as it's
> > related to the bridge, not the connector.
> >
> > > > > +
> > > > > +static struct drm_encoder *
> > > > > +tc_connector_best_encoder(struct drm_connector *connector)
> > > > > +{
> > > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > > +
> > > > > +     return tc->bridge.encoder;
> > > > > +}
> > > > > +
> > > > > +static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
> > > > > +     .get_modes = tc_connector_get_modes,
> > > > > +     .mode_valid = tc_connector_mode_valid,
> > > > > +     .best_encoder = tc_connector_best_encoder,
> > > > > +};
> > > > > +
> > > > > +static const struct drm_connector_funcs tc_connector_funcs = {
> > > > > +     .fill_modes = drm_helper_probe_single_connector_modes,
> > > > > +     .destroy = drm_connector_cleanup,
> > > > > +     .reset = drm_atomic_helper_connector_reset,
> > > > > +     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > > > > +     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > > > > +};
> > > > > +
> > > > > +int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> > > > > +{
> > > > > +     u32 num_lanes;
> > > > > +     u8 dual_link, data_format;
> > > > > +
> > > > > +     of_property_read_u8(np, "tc,dual-link", &dual_link);
> > > > > +     of_property_read_u8(np, "tc,data-format", &data_format);
> > > > > +     of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
> > > > > +
> > > > > +     if (num_lanes < 1 || num_lanes > 4)
> > > > > +             return -EINVAL;
> > > > > +
> > > > > +     tc->num_dsi_lanes = num_lanes;
> > > > > +     tc->dual_link = dual_link;
> > > > > +     tc->data_format = data_format;
> > > > > +
> > > > > +     tc->host_node = of_graph_get_remote_node(np, 0, 0);
> > > > > +     if (!tc->host_node)
> > > > > +             return -ENODEV;
> > > > > +
> > > > > +     of_node_put(tc->host_node);
> > > > > +
> > > > > +     return 0;
> > > > > +}
> > > > > +
> > > > > +int tc358775_attach_dsi(struct tc_data *tc)
> > > > > +{
> > > > > +     struct device *dev = &tc->i2c->dev;
> > > > > +     struct mipi_dsi_host *host;
> > > > > +     struct mipi_dsi_device *dsi;
> > > > > +     int ret = 0;
> > > > > +     const struct mipi_dsi_device_info info = { .type = "tc358775",
> > > > > +                                                     .channel = 0,
> > > > > +                                                     .node = NULL,
> > > > > +                                             };
> > > > > +
> > > > > +     host = of_find_mipi_dsi_host_by_node(tc->host_node);
> > > > > +     if (!host) {
> > > > > +             dev_err(dev, "failed to find dsi host\n");
> > > > > +             return -EPROBE_DEFER;
> > > > > +     }
> > > > > +
> > > > > +     dsi = mipi_dsi_device_register_full(host, &info);
> > > > > +     if (IS_ERR(dsi)) {
> > > > > +             dev_err(dev, "failed to create dsi device\n");
> > > > > +             ret = PTR_ERR(dsi);
> > > > > +             goto err_dsi_device;
> > > > > +     }
> > > > > +
> > > > > +     tc->dsi = dsi;
> > > > > +
> > > > > +     dsi->lanes = tc->num_dsi_lanes;
> > > > > +     dsi->format = MIPI_DSI_FMT_RGB888;
> > > > > +     dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> > > > > +
> > > > > +     ret = mipi_dsi_attach(dsi);
> > > > > +     if (ret < 0) {
> > > > > +             dev_err(dev, "failed to attach dsi to host\n");
> > > > > +             goto err_dsi_attach;
> > > > > +     }
> > > > > +
> > > > > +     return 0;
> > > > > +
> > > > > +err_dsi_attach:
> > > > > +     mipi_dsi_device_unregister(dsi);
> > > > > +err_dsi_device:
> > > > > +     return ret;
> > > > > +}
> > > > > +
> > > > > +static int tc_bridge_attach(struct drm_bridge *bridge)
> > > > > +{
> > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > +     struct drm_device *drm = bridge->dev;
> > > > > +     int ret;
> > > > > +
> > > > > +     /* Create LVDS connector */
> > > > > +     drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
> > > > > +     ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
> > > > > +                              DRM_MODE_CONNECTOR_LVDS);
> > > > > +     if (ret)
> > > > > +             return ret;
> > > > > +
> > > > > +     if (tc->panel)
> > > > > +             drm_panel_attach(tc->panel, &tc->connector);
> > > > > +
> > > > > +     drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
> > > > > +
> > > > > +     ret = tc358775_attach_dsi(tc);
> > > >
> > > > Ignored retval.
> > > >
> > > > > +
> > > > > +     return 0;
> > > > > +}
> > > > > +
> > > > > +static const struct drm_bridge_funcs tc_bridge_funcs = {
> > > > > +     .attach = tc_bridge_attach,
> > > > > +     .pre_enable = tc_bridge_pre_enable,
> > > > > +     .enable = tc_bridge_enable,
> > > > > +     .disable = tc_bridge_disable,
> > > > > +     .post_disable = tc_bridge_post_disable,
> > > > > +};
> > > > > +
> > > > > +static const struct regmap_config tc_regmap_config = {
> > > > > +     .name = "tc358775",
> > > > > +     .reg_bits = 16,
> > > > > +     .val_bits = 32,
> > > > > +     .reg_stride = 4,
> > > > > +     .max_register = 0x05A8,
> > > > > +     .cache_type = REGCACHE_RBTREE,
> > > > > +     .reg_format_endian = REGMAP_ENDIAN_BIG,
> > > > > +     .val_format_endian = REGMAP_ENDIAN_LITTLE,
> > > > > +};
> > > > > +
> > > > > +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
> > > > > +{
> > > > > +     struct device *dev = &client->dev;
> > > > > +     struct tc_data *tc;
> > > > > +     int ret;
> > > > > +     unsigned int i;
> > > > > +
> > > > > +     tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> > > > > +     if (!tc)
> > > > > +             return -ENOMEM;
> > > > > +
> > > > > +     tc->dev = dev;
> > > > > +     tc->i2c = client;
> > > > > +     tc->status = connector_status_connected;
> > > > > +
> > > > > +     /* port@1 is the output port */
> > > > > +     ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
> > > > > +     if (ret && ret != -ENODEV)
> > > > > +             return ret;
> >
> > You should support cases where the next device is a bridge. I recommand
> > wrapping the panel in a drm_panel_bridge with drm_panel_bridge_add(),
> > and then handling the next component as a bridge in all code paths. This
> > will allow removing manual enable/disable of panels above, as bridge
> > chaining is handled automatically. drm_panel_bridge creates a
> > drm_connector, so you can drop your manual connector implementation
> > here, simplifying the code.
>
> i am not clear on this drm_panel_bridge_add() usage, please
> clarify/any reference would be helpful.

See drivers/gpu/drm/bridge/lvds-codec.c for instance. Note that you
should not used the *_typed() version of drm_panel_bridge_add in new
drivers, you should instead use drm_panel_bridge_add() or
devm_drm_panel_bridge_add().

> > > > > +
> > > > > +     ret = tc358775_parse_dt(dev->of_node, tc);
> > > > > +     if (ret)
> > > > > +             return ret;
> > > > > +
> > > > > +     for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
> > > > > +             tc->supplies[i].supply = regulator_names[i];
> > > > > +
> > > > > +     ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
> > > > > +                                   tc->supplies);
> > > > > +     if (ret < 0)
> > > > > +             dev_err(dev, "failed to init regulator, ret=%d\n", ret);
> > > > > +
> > > > > +     tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> > > > > +     if (IS_ERR(tc->stby_gpio)) {
> > > > > +             ret = PTR_ERR(tc->stby_gpio);
> > > > > +             dev_err(dev, "cannot get stby-gpio %d\n", ret);
> > > > > +             return ret;
> > > > > +     }
> > > > > +
> > > > > +     tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > > > > +     if (IS_ERR(tc->reset_gpio)) {
> > > > > +             ret = PTR_ERR(tc->reset_gpio);
> > > > > +             dev_err(dev, "cannot get reset-gpios %d\n", ret);
> > > > > +             return ret;
> > > > > +     }
> > > > > +
> > > > > +     tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
> > > > > +     if (IS_ERR(tc->regmap)) {
> > > > > +             ret = PTR_ERR(tc->regmap);
> > > > > +             dev_err(dev, "Failed to initialize regmap: %d\n", ret);
> > > > > +             return ret;
> > > > > +     }
> > > > > +
> > > > > +     tc->bridge.funcs = &tc_bridge_funcs;
> > > > > +     tc->bridge.of_node = dev->of_node;
> > > > > +     drm_bridge_add(&tc->bridge);
> > > > > +
> > > > > +     i2c_set_clientdata(client, tc);
> > > > > +
> > > > > +     return 0;
> > > > > +}
> > > > > +
> > > > > +static int tc_remove(struct i2c_client *client)
> > > > > +{
> > > > > +     struct tc_data *tc = i2c_get_clientdata(client);
> > > > > +
> > > > > +     drm_bridge_remove(&tc->bridge);
> > > > > +
> > > > > +     return 0;
> > > > > +}
> > > > > +
> > > > > +static const struct i2c_device_id tc358775_i2c_ids[] = {
> > > > > +     { "tc358775", 0 },
> > > > > +     { }
> > > > > +};
> > > > > +MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
> > > > > +
> > > > > +static const struct of_device_id tc358775_of_ids[] = {
> > > > > +     { .compatible = "toshiba,tc358775", },
> > > > > +     { }
> > > > > +};
> > > > > +MODULE_DEVICE_TABLE(of, tc358775_of_ids);
> > > > > +
> > > > > +static struct i2c_driver tc358775_driver = {
> > > > > +     .driver = {
> > > > > +             .name = "tc358775",
> > > > > +             .of_match_table = tc358775_of_ids,
> > > > > +     },
> > > > > +     .id_table = tc358775_i2c_ids,
> > > > > +     .probe = tc_probe,
> > > > > +     .remove = tc_remove,
> > > > > +};
> > > > > +module_i2c_driver(tc358775_driver);
> > > > > +
> > > > > +MODULE_AUTHOR("Vinay Simha BN <vinaysimha@inforcecomputing.com>");
> > > > > +MODULE_DESCRIPTION("tc358775 LVDS encoder driver");
> > > >
> > > > maybe  better:
> > > >
> > > > tc358775 DSI/LVDS bridge driver
> > > >
> > > > > +MODULE_LICENSE("GPL v2");

-- 
Regards,

Laurent Pinchart

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH] display/bridge: dsi2lvds tc358775 driver
  2020-03-12 14:31           ` Laurent Pinchart
@ 2020-03-15 15:30             ` Vinay Simha B N
  0 siblings, 0 replies; 8+ messages in thread
From: Vinay Simha B N @ 2020-03-15 15:30 UTC (permalink / raw)
  To: Laurent Pinchart
  Cc: Andrzej Hajda,
	open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
	Jernej Skrabec, Neil Armstrong, David Airlie, Jonas Karlman,
	open list, open list:DRM DRIVERS, Rob Herring, m.purski

laurent,

Is it possible to access the data-lanes of dsi, by using d2l_in in the
bridge driver by ports funcs? because num_lanes  is not accessible
outside dsi_host, not available any of the drm parameters.

dsi@1a98000 {
          ports {
                port@1 {
                        endpoint {
                                remote-endpoint = <&d2l_in>;
                                data-lanes = <0 1 2 3>;
                        };
                };
        };
};

tc_bridge: bridge@f {
        status = "okay";
...
ports {

        port@0 {
                reg = <0>;
                d2l_in: endpoint {
                        remote-endpoint = <&dsi0_out>;
                };
        };

        port@1 {
                 reg = <1>;
                lvds0_out: endpoint {
                        remote-endpoint = <&panel_in0>;
             };
        };
   };
};

On Thu, Mar 12, 2020 at 8:01 PM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Vinay,
>
> On Wed, Mar 11, 2020 at 03:30:48PM +0530, Vinay Simha B N wrote:
> > Laurent Pinchart,
> >
> > if we want to set to jeida-18 data mapping,
> > do we need to set DATA3 with "Logic 0" LVI_L0 ?
>
> If the TC358775 supports setting unused outputs to a fixed logic level I
> think that's best, yes.
>
> > Please see reply inline.
>
> Same :-)
>
> > >
> > > On Fri, Mar 06, 2020 at 06:06:36PM +0530, Vinay Simha B N wrote:
> > > > hi andrzej,
> > > >
> > > > I had a doubt In the tc358764 driver,VP_CTRL, VP_CTRL_VSDELAY(15) is
> > > > hardcoded to 15, but this has to be dynamic based on the resolution of
> > > > panel used?
> > > >
> > > > Please see the reply inline.
> > > >
> > > > On Tue, Mar 3, 2020 at 8:39 PM Andrzej Hajda <a.hajda@samsung.com> wrote:
> > > > > On 27.02.2020 15:03, Vinay Simha BN wrote:
> > > > > > dsi2lvds tc358775 bridge driver added
> > > > > > Tested in apq8016, ifc6309 board and panel
> > > > > > auo,b101xtn01
> > > > >
> > > > > Just FYI, there exists already TC358764/5 driver for similar hw, but
> > > > > controlled via DSI bus.
> > > >
> > > > There is not much difference between these two chips, but still the
> > > > dsi read access for 775 does not works.
> > > > TC358764/5 - 800Mbps per lane, 3.2Gbps
> > > > TC358775 - 1Gbps per lane, 4Gbps.
> > > >
> > > > tc358775 chip details -
> > > > https://download.t-firefly.com/product/RK3399/Docs/Chip%20Specifications/TC358774XBG_75XBG_V1%204nm.pdf
> > > > I am able to configure the tc358775 chip by i2c, but from dsi it fails
> > > > i tried accessing the tc358775 chip by dsi using apq8016-qcom , but it
> > > > fails to read the chip id itself.
> > > >
> > > > Please suggest if you any inputs for this issue.
> > > >
> > > > https://github.com/vinaysimhabn/kernel-msm/commits/5.6.0-rc3-dsi2lvds-dsi
> > > >
> > > > [    4.582405] tc358764 1a98000.dsi.0: read: 1408, addr: 0
> > > > [    4.582426] tc358764 1a98000.dsi.0: ID: 0x0
> > > > [    4.582451] tc358764 1a98000.dsi.0: error initializing bridge (-22)
> > > >
> > > > [    4.796220] dsi_cmds2buf_tx: cmd dma tx failed, type=0x24, data0=0x80, len=4
> > > > [    4.796244] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > > > [    4.796266] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > > > [    4.796288] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > > > [    4.796310] [drm:msm_dsi_host_cmd_rx] data = 0x0 and ntohl(data) = 0x0
> > > > [    4.796319] msm_dsi_host_cmd_rx:Invalid response cmd
> > > >
> > > > > > Signed-off-by: Vinay Simha BN <simhavcs@gmail.com>
> > > > > > ---
> > > > > >  .../bindings/display/bridge/toshiba,tc358775.txt   | 106 ++++
> > > > >
> > > > > Bindings should be in separate patch and in yaml format.
> > > > >
> > > > > >  drivers/gpu/drm/bridge/Kconfig                     |  10 +
> > > > > >  drivers/gpu/drm/bridge/Makefile                    |   1 +
> > > > > >  drivers/gpu/drm/bridge/tc358775.c                  | 687 +++++++++++++++++++++
> > > > > >  4 files changed, 804 insertions(+)
> > > > > >  create mode 100644 Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > > >  create mode 100644 drivers/gpu/drm/bridge/tc358775.c
> > > > > >
> > > > > > diff --git a/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > > > new file mode 100644
> > > > > > index 0000000..c4c364d
> > > > > > --- /dev/null
> > > > > > +++ b/Documentation/devicetree/bindings/display/bridge/toshiba,tc358775.txt
> > > > > > @@ -0,0 +1,106 @@
> > > > > > +Toshiba TC358775 DSI to LVDS bridge bindings
> > > > > > +
> > > > > > +Required properties:
> > > > > > + - compatible: "toshiba,tc358775"
> > > > > > + - reg: i2c address of the bridge, 0x0f
> > > > > > + - tc, dsi-lanes: Number of DSI data lanes connected to the DSI host. It should
> > > > > > +  be one of 1, 2, 3 or 4.
> > > > > > + - tc, dual-link : To configure the LVDS transmitter either
> > > > > > +  as single-link or dual-link.
> > > > > > + - tc, data-format: To configure the data formats
> > > > > > +   0 for VESA standard, 1 for JEIDA standard
> > > > >
> > > > > IMO, three properties above should be received from downstream device in
> > > > > runtime, not hardcoded into DT, however I am not sure if frameworks
> > > > > support it.
> > >
> > > I assume Andrzej meant upstream device for the tc,dsi-lanes property.
> > > This should be exposed through the data-lanes property as described in
> > > media/video-interface.txt.
> >
> > data-lanes mainly used for the interfaces of the hardware.
> > example : dsi, csi
>
> Correct, so please use it to replace tc,dsi-lanes :-)
>
> > In general panels/bridges either it will be hardcoded by setting in the
> > panel driver like this dsi->lanes = 4;
> > bridge  -> dsi2hdmi display/bridge/adi,adv7511.txt it wil be set by
> > adi,dsi-lanes
>
> That's a mistake in the bindings, let's not repeat it.
>
> > > The tc,dual-link property should be replaced by exposing two port nodes,
> > > one for each link, and connecting them appropriately. See
> > > display/bridge/thine,thc63lvd1024.txt for an example of DT bindings on
> > > the LVDS receiver side, and drivers/gpu/drm/rcar-du/rcar_lvds.c for an
> > > example implementation on the LVDS transmitter side.
> >
> > Can we add two port nodes though it can give only 1 output? when
> > higher resolution panel used dual_link is enabled in LVCFG
>
> Sure, you will have three ports in total, one for the DSI intput, and
> two for the two LVDS outputs. A port node maps to a physical connection,
> and there's nothing wrong with having two port nodes to describe the
> dual-link LVDS output.
>
> > > The tc,data-format property should be replaced by the data-mapping
> > > property on the downstream LVDS device (see display/panel/lvds.yaml) and
> > > queried at runtime.
> > >
> > > > > > + - vdd-supply: 1.2V LVDS Power Supply
> > > > > > + - vddio-supply: 1.8V IO Power Supply
> > > > > > + - stby-gpios: Standby pin, Low active
> > > > > > + - reset-gpios: Hardware reset,      Low active
> > > > > > +
> > > > > > +Required nodes:
> > > > > > +
> > > > > > +The TC358775 has two ports. Their connections are modelled using the OF
> > > > > > +graph bindings specified in Documentation/devicetree/bindings/graph.txt.
> > > > > > +
> > > > > > +- Video port 0 for the DSI input. The remote endpoint phandle should be a
> > > > > > +     reference to a valid mipi_dsi_host device node.
> > > > > > +- Video port 1 for the LVDS output.
> > > > > > +
> > > > > > +Example:
> > > > > > +
> > > > > > +     i2c@78b8000 {
> > > > > > +             /* On High speed expansion */
> > > > > > +             label = "HS-I2C2";
> > > > > > +             status = "okay";
> > > > > > +
> > > > > > +             tc_bridge: bridge@f {
> > > > > > +                     status = "okay";
> > > > > > +
> > > > > > +                     compatible = "toshiba,tc358775";
> > > > > > +                     reg = <0x0f>;
> > > > > > +
> > > > > > +                     tc,dsi-lanes = <4>;
> > > > > > +                     tc,dual-link = <0>;
> > > > > > +                     tc,data-format = <1>;
> > > > > > +
> > > > > > +                     vdd-supply = <&pm8916_l2>;
> > > > > > +                     vddio-supply = <&pm8916_l6>;
> > > > > > +
> > > > > > +                     stby-gpio = <&msmgpio 99 GPIO_ACTIVE_LOW>;
> > > > > > +                     reset-gpio = <&msmgpio 72 GPIO_ACTIVE_LOW>;
> > > > > > +
> > > > > > +                     ports {
> > > > > > +                             #address-cells = <1>;
> > > > > > +                             #size-cells = <0>;
> > > > > > +
> > > > > > +                             port@0 {
> > > > > > +                                     reg = <0>;
> > > > > > +                                     d2l_in: endpoint {
> > > > > > +                                             remote-endpoint = <&dsi0_out>;
> > > > > > +                                     };
> > > > > > +                             };
> > > > > > +
> > > > > > +                             port@1 {
> > > > > > +                                     reg = <1>;
> > > > > > +                                     d2l_out: endpoint {
> > > > > > +                                             remote-endpoint = <&panel_in>;
> > > > > > +                                     };
> > > > > > +                             };
> > > > > > +                     };
> > > > > > +             };
> > > > > > +     };
> > > > > > +
> > > > > > +     panel: auo,b101xtn01 {
> > > > > > +                     status = "okay";
> > > > > > +                     compatible = "auo,b101xtn01";
> > > > > > +                     power-supply = <&pm8916_l14>;
> > > > > > +
> > > > > > +                     port {
> > > > > > +                             panel_in: endpoint {
> > > > > > +                                     remote-endpoint = <&d2l_out>;
> > > > > > +                             };
> > > > > > +                     };
> > > > > > +     };
> > > > > > +
> > > > > > +     mdss@1a00000 {
> > > > > > +             status = "okay";
> > > > > > +
> > > > > > +             mdp@1a01000 {
> > > > > > +                     status = "okay";
> > > > > > +             };
> > > > > > +
> > > > > > +             dsi@1a98000 {
> > > > > > +                     status = "okay";
> > > > > > +                     ..
> > > > > > +                     ports {
> > > > > > +                             port@1 {
> > > > > > +                                     dsi0_out: endpoint {
> > > > > > +                                             remote-endpoint = <&d2l_in>;
> > > > > > +                                             data-lanes = <0 1 2 3>;
> > > > > > +                                     };
> > > > > > +                             };
> > > > > > +                     };
> > > > > > +             };
> > > > > > +
> > > > > > +             dsi-phy@1a98300 {
> > > > > > +                     status = "okay";
> > > > > > +                     ..
> > > > > > +             };
> > > > > > +     };
> > > > > > diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> > > > > > index 8397bf7..d5528fa 100644
> > > > > > --- a/drivers/gpu/drm/bridge/Kconfig
> > > > > > +++ b/drivers/gpu/drm/bridge/Kconfig
> > > > > > @@ -133,6 +133,16 @@ config DRM_TOSHIBA_TC358767
> > > > > >       ---help---
> > > > > >         Toshiba TC358767 eDP bridge chip driver.
> > > > > >
> > > > > > +config DRM_TOSHIBA_TC358775
> > > > > > +        tristate "Toshiba TC358775 LVDS bridge"
> > > > > > +        depends on OF
> > > > > > +        select DRM_KMS_HELPER
> > > > > > +        select REGMAP_I2C
> > > > > > +        select DRM_PANEL
> > > > > > +     select DRM_MIPI_DSI
> > > > > > +        ---help---
> > > > > > +          Toshiba TC358775 LVDS bridge chip driver.
> > > > > > +
> > > > > >  config DRM_TI_TFP410
> > > > > >       tristate "TI TFP410 DVI/HDMI bridge"
> > > > > >       depends on OF
> > > > > > diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> > > > > > index 1eb5376..9b2c512 100644
> > > > > > --- a/drivers/gpu/drm/bridge/Makefile
> > > > > > +++ b/drivers/gpu/drm/bridge/Makefile
> > > > > > @@ -12,6 +12,7 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
> > > > > >  obj-$(CONFIG_DRM_THINE_THC63LVD1024) += thc63lvd1024.o
> > > > > >  obj-$(CONFIG_DRM_TOSHIBA_TC358764) += tc358764.o
> > > > > >  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
> > > > > > +obj-$(CONFIG_DRM_TOSHIBA_TC358775) += tc358775.o
> > > > > >  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
> > > > > >  obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
> > > > > >  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
> > > > > > diff --git a/drivers/gpu/drm/bridge/tc358775.c b/drivers/gpu/drm/bridge/tc358775.c
> > > > > > new file mode 100644
> > > > > > index 0000000..3db0f49
> > > > > > --- /dev/null
> > > > > > +++ b/drivers/gpu/drm/bridge/tc358775.c
> > > > > > @@ -0,0 +1,687 @@
> > > > > > +// SPDX-License-Identifier: GPL-2.0
> > > > > > +/*
> > > > > > + * tc358775 DSI to LVDS bridge driver
> > > > > > + *
> > > > > > + * Copyright (C) 2020 InforceComputing
> > > > > > + * Author: Vinay Simha BN <vinaysimha@inforcecomputing.com>
> > > > > > + *
> > > > > > + * This program is free software; you can redistribute it and/or modify
> > > > > > + * it under the terms of the GNU General Public License as published by
> > > > > > + * the Free Software Foundation; either version 2 of the License, or
> > > > > > + * (at your option) any later version.
> > > > > > + *
> > > > > > + * This program is distributed in the hope that it will be useful,
> > > > > > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > > > > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > > > > > + * GNU General Public License for more details.
> > > > >
> > > > > You can drop these statements, SPDX identifier is enough.
> > > > >
> > > > > > + */
> > > > > > +
> > > > > > +/* #define DEBUG */
> > > > > > +/* #define TC358775_DEBUG */
> > > > >
> > > > > Please remove these development leftovers.
> > > > >
> > > > > > +#include <linux/clk.h>
> > > > > > +#include <linux/device.h>
> > > > > > +#include <linux/gpio/consumer.h>
> > > > > > +#include <linux/i2c.h>
> > > > > > +#include <linux/kernel.h>
> > > > > > +#include <linux/module.h>
> > > > > > +#include <linux/regmap.h>
> > > > > > +#include <linux/slab.h>
> > > > > > +#include <linux/regulator/consumer.h>
> > > > > Alphabetic order.
> > > > > > +
> > > > > > +#include <drm/drm_mipi_dsi.h>
> > > > > > +#include <drm/drm_atomic_helper.h>
> > > > > > +#include <drm/drm_crtc_helper.h>
> > > > > > +#include <drm/drm_dp_helper.h>
> > > > > > +#include <drm/drm_of.h>
> > > > > > +#include <drm/drm_panel.h>
> > > > > > +#include <drm/drm_bridge.h>
> > > > > > +#include <drm/drm_probe_helper.h>
> > > > > ditto
> > > > > > +
> > > > > > +/* Registers */
> > > > > > +
> > > > > > +/* DSI D-PHY Layer Registers */
> > > > > > +#define D0W_DPHYCONTTX  0x0004  /* Data Lane 0 DPHY Tx Control */
> > > > > > +#define CLW_DPHYCONTRX  0x0020  /* Clock Lane DPHY Rx Control */
> > > > > > +#define D0W_DPHYCONTRX  0x0024  /* Data Lane 0 DPHY Rx Control */
> > > > > > +#define D1W_DPHYCONTRX  0x0028  /* Data Lane 1 DPHY Rx Control */
> > > > > > +#define D2W_DPHYCONTRX  0x002C  /* Data Lane 2 DPHY Rx Control */
> > > > > > +#define D3W_DPHYCONTRX  0x0030  /* Data Lane 3 DPHY Rx Control */
> > > > > > +#define COM_DPHYCONTRX  0x0038  /* DPHY Rx Common Control */
> > > > > > +#define CLW_CNTRL       0x0040  /* Clock Lane Control */
> > > > > > +#define D0W_CNTRL       0x0044  /* Data Lane 0 Control */
> > > > > > +#define D1W_CNTRL       0x0048  /* Data Lane 1 Control */
> > > > > > +#define D2W_CNTRL       0x004C  /* Data Lane 2 Control */
> > > > > > +#define D3W_CNTRL       0x0050  /* Data Lane 3 Control */
> > > > > > +#define DFTMODE_CNTRL   0x0054  /* DFT Mode Control */
> > > > > > +
> > > > > > +/* DSI PPI Layer Registers */
> > > > > > +#define PPI_STARTPPI    0x0104  /* START control bit of PPI-TX function. */
> > > > > > +#define PPI_BUSYPPI     0x0108
> > > > > > +#define PPI_LINEINITCNT 0x0110  /* Line Initialization Wait Counter  */
> > > > > > +#define PPI_LPTXTIMECNT 0x0114
> > > > > > +#define PPI_LANEENABLE  0x0134  /* Enables each lane at the PPI layer. */
> > > > > > +#define PPI_TX_RX_TA    0x013C  /* DSI Bus Turn Around timing parameters */
> > > > > > +
> > > > > > +/* Analog timer function enable */
> > > > > > +#define PPI_CLS_ATMR    0x0140  /* Delay for Clock Lane in LPRX  */
> > > > > > +#define PPI_D0S_ATMR    0x0144  /* Delay for Data Lane 0 in LPRX */
> > > > > > +#define PPI_D1S_ATMR    0x0148  /* Delay for Data Lane 1 in LPRX */
> > > > > > +#define PPI_D2S_ATMR    0x014C  /* Delay for Data Lane 2 in LPRX */
> > > > > > +#define PPI_D3S_ATMR    0x0150  /* Delay for Data Lane 3 in LPRX */
> > > > > > +#define PPI_D0S_CLRSIPOCOUNT    0x0164
> > > > > > +
> > > > > > +#define PPI_D1S_CLRSIPOCOUNT    0x0168  /* For lane 1 */
> > > > > > +#define PPI_D2S_CLRSIPOCOUNT    0x016C  /* For lane 2 */
> > > > > > +#define PPI_D3S_CLRSIPOCOUNT    0x0170  /* For lane 3 */
> > > > > > +
> > > > > > +#define CLS_PRE         0x0180  /* Digital Counter inside of PHY IO */
> > > > > > +#define D0S_PRE         0x0184  /* Digital Counter inside of PHY IO */
> > > > > > +#define D1S_PRE         0x0188  /* Digital Counter inside of PHY IO */
> > > > > > +#define D2S_PRE         0x018C  /* Digital Counter inside of PHY IO */
> > > > > > +#define D3S_PRE         0x0190  /* Digital Counter inside of PHY IO */
> > > > > > +#define CLS_PREP        0x01A0  /* Digital Counter inside of PHY IO */
> > > > > > +#define D0S_PREP        0x01A4  /* Digital Counter inside of PHY IO */
> > > > > > +#define D1S_PREP        0x01A8  /* Digital Counter inside of PHY IO */
> > > > > > +#define D2S_PREP        0x01AC  /* Digital Counter inside of PHY IO */
> > > > > > +#define D3S_PREP        0x01B0  /* Digital Counter inside of PHY IO */
> > > > > > +#define CLS_ZERO        0x01C0  /* Digital Counter inside of PHY IO */
> > > > > > +#define D0S_ZERO        0x01C4  /* Digital Counter inside of PHY IO */
> > > > > > +#define D1S_ZERO        0x01C8  /* Digital Counter inside of PHY IO */
> > > > > > +#define D2S_ZERO        0x01CC  /* Digital Counter inside of PHY IO */
> > > > > > +#define D3S_ZERO        0x01D0  /* Digital Counter inside of PHY IO */
> > > > > > +
> > > > > > +#define PPI_CLRFLG      0x01E0  /* PRE Counters has reached set values */
> > > > > > +#define PPI_CLRSIPO     0x01E4  /* Clear SIPO values, Slave mode use only. */
> > > > > > +#define HSTIMEOUT       0x01F0  /* HS Rx Time Out Counter */
> > > > > > +#define HSTIMEOUTENABLE 0x01F4  /* Enable HS Rx Time Out Counter */
> > > > > > +#define DSI_STARTDSI    0x0204  /* START control bit of DSI-TX function */
> > > > > > +#define DSI_BUSYDSI     0x0208
> > > > > > +#define DSI_LANEENABLE  0x0210  /* Enables each lane at the Protocol layer. */
> > > > > > +#define DSI_LANESTATUS0 0x0214  /* Displays lane is in HS RX mode. */
> > > > > > +#define DSI_LANESTATUS1 0x0218  /* Displays lane is in ULPS or STOP state */
> > > > > > +
> > > > > > +#define DSI_INTSTATUS   0x0220  /* Interrupt Status */
> > > > > > +#define DSI_INTMASK     0x0224  /* Interrupt Mask */
> > > > > > +#define DSI_INTCLR      0x0228  /* Interrupt Clear */
> > > > > > +#define DSI_LPTXTO      0x0230  /* Low Power Tx Time Out Counter */
> > > > > > +
> > > > > > +#define DSIERRCNT       0x0300  /* DSI Error Count */
> > > > > > +#define APLCTRL         0x0400  /* Application Layer Control */
> > > > > > +#define RDPKTLN         0x0404  /* Command Read Packet Length */
> > > > > > +
> > > > > > +#define VPCTRL          0x0450  /* Video Path Control */
> > > > > > +#define HTIM1           0x0454  /* Horizontal Timing Control 1 */
> > > > > > +#define HTIM2           0x0458  /* Horizontal Timing Control 2 */
> > > > > > +#define VTIM1           0x045C  /* Vertical Timing Control 1 */
> > > > > > +#define VTIM2           0x0460  /* Vertical Timing Control 2 */
> > > > > > +#define VFUEN           0x0464  /* Video Frame Timing Update Enable */
> > > > > > +
> > > > > > +/* Mux Input Select for LVDS LINK Input */
> > > > > > +#define LVMX0003        0x0480  /* Bit 0 to 3 */
> > > > > > +#define LVMX0407        0x0484  /* Bit 4 to 7 */
> > > > > > +#define LVMX0811        0x0488  /* Bit 8 to 11 */
> > > > > > +#define LVMX1215        0x048C  /* Bit 12 to 15 */
> > > > > > +#define LVMX1619        0x0490  /* Bit 16 to 19 */
> > > > > > +#define LVMX2023        0x0494  /* Bit 20 to 23 */
> > > > > > +#define LVMX2427        0x0498  /* Bit 24 to 27 */
> > > > > > +
> > > > > > +#define LVCFG           0x049C  /* LVDS Configuration  */
> > > > > > +#define LVPHY0          0x04A0  /* LVDS PHY 0 */
> > > > > > +#define LVPHY1          0x04A4  /* LVDS PHY 1 */
> > > > > > +#define SYSSTAT         0x0500  /* System Status  */
> > > > > > +#define SYSRST          0x0504  /* System Reset  */
> > > > > > +/* GPIO Registers */
> > > > > > +#define GPIOC           0x0520  /* GPIO Control  */
> > > > > > +#define GPIOO           0x0524  /* GPIO Output  */
> > > > > > +#define GPIOI           0x0528  /* GPIO Input  */
> > > > > > +
> > > > > > +/* I2C Registers */
> > > > > > +#define I2CTIMCTRL      0x0540  /* I2C IF Timing and Enable Control */
> > > > > > +#define I2CMADDR        0x0544  /* I2C Master Addressing */
> > > > > > +#define WDATAQ          0x0548  /* Write Data Queue */
> > > > > > +#define RDATAQ          0x054C  /* Read Data Queue */
> > > > > > +
> > > > > > +/* Chip ID and Revision ID Register */
> > > > > > +#define IDREG           0x0580
> > > > > > +
> > > > > > +#define TC358775XBG_ID  0x00007500
> > > > > > +
> > > > > > +/* Debug Registers */
> > > > > > +#define DEBUG00         0x05A0  /* Debug */
> > > > > > +#define DEBUG01         0x05A4  /* LVDS Data */
> > > > > > +
> > > > > > +#define DSI_CLEN_BIT         BIT(0)
> > > > > > +#define DIVIDE_BY_3          3 /* PCLK=DCLK/3 */
> > > > > > +#define LVCFG_LVEN_BIT               BIT(0)
> > > > > > +
> > > > > > +#define L0EN BIT(1)
> > > > > > +
> > > > > > +#define TC358775_VPCTRL_VSDELAY__MASK        0x3FF00000
> > > > > > +#define TC358775_VPCTRL_VSDELAY__SHIFT       20
> > > > > > +static inline uint32_t TC358775_VPCTRL_VSDELAY(uint32_t val)
> > > > >
> > > > >
> > > > > Use u32 here and below, unit32_t is mainly for userspace interactions.
> > > > >
> > > > >
> > > > > > +{
> > > > > > +     return ((val) << TC358775_VPCTRL_VSDELAY__SHIFT) &
> > > > > > +                     TC358775_VPCTRL_VSDELAY__MASK;
> > > > > > +}
> > > > > > +
> > > > > > +#define TC358775_VPCTRL_OPXLFMT__MASK        0x00000100
> > > > > > +#define TC358775_VPCTRL_OPXLFMT__SHIFT       8
> > > > > > +static inline uint32_t TC358775_VPCTRL_OPXLFMT(uint32_t val)
> > > > > > +{
> > > > > > +     return ((val) << TC358775_VPCTRL_OPXLFMT__SHIFT) &
> > > > > > +                     TC358775_VPCTRL_OPXLFMT__MASK;
> > > > > > +}
> > > > > > +
> > > > > > +#define TC358775_VPCTRL_MSF__MASK    0x00000001
> > > > > > +#define TC358775_VPCTRL_MSF__SHIFT   0
> > > > > > +static inline uint32_t TC358775_VPCTRL_MSF(uint32_t val)
> > > > > > +{
> > > > > > +     return ((val) << TC358775_VPCTRL_MSF__SHIFT) &
> > > > > > +                     TC358775_VPCTRL_MSF__MASK;
> > > > > > +}
> > > > > > +
> > > > > > +#define TC358775_LVCFG_PCLKDIV__MASK 0x000000f0
> > > > > > +#define TC358775_LVCFG_PCLKDIV__SHIFT        4
> > > > > > +static inline uint32_t TC358775_LVCFG_PCLKDIV(uint32_t val)
> > > > > > +{
> > > > > > +     return ((val) << TC358775_LVCFG_PCLKDIV__SHIFT) &
> > > > > > +                     TC358775_LVCFG_PCLKDIV__MASK;
> > > > > > +}
> > > > > > +
> > > > > > +#define TC358775_LVCFG_LVDLINK__MASK                         0x00000002
> > > > > > +#define TC358775_LVCFG_LVDLINK__SHIFT                        0
> > > > > > +static inline uint32_t TC358775_LVCFG_LVDLINK(uint32_t val)
> > > > > > +{
> > > > > > +     return ((val) << TC358775_LVCFG_LVDLINK__SHIFT) &
> > > > > > +                     TC358775_LVCFG_LVDLINK__MASK;
> > > > > > +}
> > > > > > +
> > > > > > +static const struct reg_sequence tc_fixed_registers[] = {
> > > > > > +     { 0x013C, 0x00040006 },
> > > > > > +     { 0x0114, 0x00000004 },
> > > > > > +     { 0x0164, 0x00000003 },
> > > > > > +     { 0x0168, 0x00000003 },
> > > > > > +     { 0x016C, 0x00000003 },
> > > > > > +     { 0x0170, 0x00000003 },
> > > > >
> > > > > use macros instead of magic numbers.
> > > > >
> > > > > > +};
> > > > > > +
> > > > > > +static const struct reg_sequence tc_vesa_data_format_registers[] = {
> > > > > > +     { 0x0480, 0x03020100 },
> > > > > > +     { 0x0484, 0x08050704 },
> > > > > > +     { 0x0488, 0x0F0E0A09 },
> > > > > > +     { 0x048C, 0x100D0C0B },
> > > > > > +     { 0x0490, 0x12111716 },
> > > > > > +     { 0x0494, 0x1B151413 },
> > > > > > +     { 0x0498, 0x061A1918 },
> > > > > ditto
> > > > > > +};
> > > > > > +
> > > > > > +static const char * const regulator_names[] = {
> > > > > > +     "vdd",
> > > > > > +     "vddio"
> > > > > > +};
> > > > > > +
> > > > > > +struct tc_data {
> > > > > > +     struct i2c_client       *i2c;
> > > > > > +
> > > > > > +     struct device           *dev;
> > > > > > +     struct regmap           *regmap;
> > > > > > +
> > > > > > +     struct drm_bridge       bridge;
> > > > > > +     struct drm_connector    connector;
> > > > > > +     struct drm_panel        *panel;
> > > > > > +
> > > > > > +     enum drm_connector_status status;
> > > > > unused field
> > status used in tc->status = connector_status_connected;
> > > > > > +     struct device_node *host_node;
> > > > > > +     struct mipi_dsi_device *dsi;
> > > > > > +     u8 num_dsi_lanes;
> > > > > > +
> > > > > > +     struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> > > > > > +     struct gpio_desc        *reset_gpio;
> > > > > > +     struct gpio_desc        *stby_gpio;
> > > > > > +     u32                     rev;
> > > > > > +     u8                      dual_link; /* single-link or dual-link */
> > > > > > +     u8                      data_format; /* VESA or JEIDA */
> > > > > > +};
> > > > > > +
> > > > > > +static inline struct tc_data *bridge_to_tc(struct drm_bridge *b)
> > > > > > +{
> > > > > > +     return container_of(b, struct tc_data, bridge);
> > > > > > +}
> > > > > > +
> > > > > > +static inline struct tc_data *connector_to_tc(struct drm_connector *c)
> > > > > > +{
> > > > > > +     return container_of(c, struct tc_data, connector);
> > > > > > +}
> > > > > > +
> > > > > > +static void tc_bridge_pre_enable(struct drm_bridge *bridge)
> > > > > > +{
> > > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > > +     struct device *dev = &tc->dsi->dev;
> > > > > > +     int ret;
> > > > > > +
> > > > > > +     ret = regulator_bulk_enable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > > > > +     if (ret < 0) {
> > > > > > +             dev_err(dev, "regulator enable failed, %d\n", ret);
> > > > > > +             return;
> > > > > > +     }
> > > > > > +     mdelay(10);
> > >
> > > You should consider usleep_range() instead of mdelay() for large delays.
> > >
> > > > > > +
> > > > > > +     gpiod_set_value(tc->stby_gpio, 0);
> > > > > > +     mdelay(10);
> > > > > > +
> > > > > > +     gpiod_set_value(tc->reset_gpio, 0);
> > > > > > +     ndelay(50);
> > > > > > +
> > > > > > +     drm_panel_prepare(tc->panel);
> > > > > > +}
> > > > > > +
> > > > > > +static void tc_bridge_disable(struct drm_bridge *bridge)
> > > > > > +{
> > > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > > +     struct device *dev = &tc->dsi->dev;
> > > > > > +     int ret;
> > > > > > +
> > > > > > +     ret = regulator_bulk_disable(ARRAY_SIZE(tc->supplies), tc->supplies);
> > > > > > +     if (ret < 0)
> > > > > > +             dev_err(dev, "regulator disable failed, %d\n", ret);
> > > > > > +     mdelay(10);
> > > > > > +
> > > > > > +     gpiod_set_value(tc->stby_gpio, 1);
> > > > > > +     mdelay(10);
> > > > > > +
> > > > > > +     gpiod_set_value(tc->reset_gpio, 1);
> > > > > > +     ndelay(50);
> > > > > > +
> > > > > > +     drm_panel_disable(tc->panel);
> > > > >
> > > > > I suspect the order should be different - ie reverse to the one pre_enable.
> >  - as per the datasheet it is not in reverse order
> >
> > > > >
> > > > > Moreover since it reverts pre_enable it should be put into post_disable
> > > > > (except drm_panel_disable).
> > > > >
> > > > > > +}
> > > > > > +
> > > > > > +static void tc_bridge_post_disable(struct drm_bridge *bridge)
> > > > > > +{
> > > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > > +
> > > > > > +     drm_panel_unprepare(tc->panel);
> > > > > > +}
> > > > > > +
> > > > > > +#ifdef TC358775_DEBUG
> > > > > > +static u32 d2l_read(struct tc_data *tc, u16 reg)
> > > > > > +{
> > > > > > +     int ret;
> > > > > > +     u32 data;
> > > > > > +
> > > > > > +     ret = regmap_bulk_read(tc->regmap, reg, &data, 1);
> > > > > > +     if (ret)
> > > > > > +             return ret;
> > > > > > +
> > > > > > +     pr_debug("d2l: I2C : reg:%04x value:%08x\n", reg, data);
> > > > > > +
> > > > > > +     return data;
> > > > > > +}
> > > > > > +#endif
> > > > >
> > > > > I guess this leftover can be removed as well.
> > > > >
> > > > > > +
> > > > > > +static int d2l_write(struct tc_data *tc, u16 reg, u32 data)
> > > > > > +{
> > > > > > +     int ret = 0;
> > > > > > +
> > > > > > +     ret = regmap_bulk_write(tc->regmap, reg, (u32[]) {data}, 1);
> > > > > > +
> > > > > > +#ifdef TC358775_DEBUG
> > > > > > +     d2l_read(tc, reg);
> > > > > > +#endif
> > > > > > +     return ret;
> > > > > > +}
> > > > > > +
> > > > > > +static void tc_bridge_enable(struct drm_bridge *bridge)
> > > > > > +{
> > > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > > +     int ret;
> > > > > > +     u32 hbpr, hpw, htime1, hfpr, hsize, htime2;
> > > > > > +     u32 vbpr, vpw, vtime1, vfpr, vsize, vtime2;
> > > > > > +     u32 val = 0;
> > > > > > +     struct drm_display_mode *mode;
> > > > > > +
> > > > > > +     mode = &bridge->encoder->crtc->state->adjusted_mode;
> > > > > > +
> > > > > > +     hbpr = 0;
> > > > > > +     hpw  = mode->hsync_end - mode->hsync_start;
> > > > > > +     vbpr = 0;
> > > > > > +     vpw  = mode->vsync_end - mode->vsync_start;
> > > > > > +
> > > > > > +     htime1 = (hbpr << 16) + hpw;
> > > > > > +     vtime1 = (vbpr << 16) + vpw;
> > > > > > +
> > > > > > +     hfpr = mode->hsync_start - mode->hdisplay;
> > > > > > +     hsize = mode->hdisplay;
> > > > > > +     vfpr = mode->vsync_start - mode->vdisplay;
> > > > > > +     vsize = mode->vdisplay;
> > > > > > +
> > > > > > +     htime2 = (hfpr << 16) + hsize;
> > > > > > +     vtime2 = (vfpr << 16) + vsize;
> > > > > > +
> > > > > > +     ret = regmap_read(tc->regmap, IDREG, &tc->rev);
> > > > > > +     if (ret) {
> > > > > > +             dev_err(tc->dev, "can not read device ID: %d\n", ret);
> > > > > > +             return;
> > > > > > +     }
> > > > > > +     pr_debug("tc IDREG %04x Rev. %08x\n", IDREG, tc->rev);
> > > > > > +
> > > > > > +     d2l_write(tc, SYSRST, 0x000000FF);
> > > > > > +     mdelay(30);
> > > > > > +
> > > > > > +     ret = regmap_register_patch(tc->regmap,
> > > > > > +                                 tc_fixed_registers,
> > > > > > +                                 ARRAY_SIZE(tc_fixed_registers));
> > > > > > +     if (ret)
> > > > > > +             return;
> > > > > > +
> > > > > > +     val = ((L0EN << tc->num_dsi_lanes) - L0EN) | DSI_CLEN_BIT;
> > > > > > +     d2l_write(tc, PPI_LANEENABLE, val);
> > > > > > +     d2l_write(tc, DSI_LANEENABLE, val);
> > > > > > +
> > > > > > +     d2l_write(tc, PPI_STARTPPI, 0x00000001);
> > > > > > +     d2l_write(tc, DSI_STARTDSI, 0x00000001);
> > > > > > +
> > > > > > +     val = TC358775_VPCTRL_VSDELAY(21); //TODO : to set the dynamic value
> > > >
> > > > Any suggestion how to set dynamic value for Vsyncdelay?
> > > >
> > > > > > +
> > > > > > +     if (tc->connector.display_info.bpc == 8) {/* RGB888 */
> > > > > > +             val |= TC358775_VPCTRL_OPXLFMT(1);
> > > > > > +             d2l_write(tc, VPCTRL, val);
> > > > > > +     } else {                                /* RGB666 */
> > > > > > +             val |= TC358775_VPCTRL_MSF(1);
> > > > > > +             d2l_write(tc, VPCTRL, val);
> > > > > > +     }
> > > > > > +
> > > > > > +     d2l_write(tc, HTIM1, htime1);
> > > > > > +     d2l_write(tc, VTIM1, vtime1);
> > > > > > +     d2l_write(tc, HTIM2, htime2);
> > > > > > +     d2l_write(tc, VTIM2, vtime2);
> > > > > > +
> > > > > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > > > > +     d2l_write(tc, SYSRST, 0x00000004);
> > > > > > +     d2l_write(tc, LVPHY0, 0x00040006);
> > > > > > +
> > > > > > +     if (tc->data_format) { /* Data Format VESA=0 , JEIDA=1 */
> > > > > > +             ret = regmap_register_patch
> > > > > > +                     (tc->regmap,
> > > > > > +                      tc_vesa_data_format_registers,
> > > > > > +                      ARRAY_SIZE(tc_vesa_data_format_registers));
> > > > > > +             if (ret)
> > > > > > +                     return;
> > > > > > +     }
> > > > > > +
> > > > > > +     d2l_write(tc, VFUEN, 0x00000001);
> > > > > > +
> > > > > > +     val = TC358775_LVCFG_PCLKDIV(DIVIDE_BY_3) | LVCFG_LVEN_BIT;
> > > > > > +     if (tc->dual_link)
> > > > > > +             val |= TC358775_LVCFG_LVDLINK(1);
> > > > > > +
> > > > > > +     d2l_write(tc, LVCFG, val);
> > > > > > +
> > > > > > +     drm_panel_enable(tc->panel);
> > > > > > +}
> > > > > > +
> > > > > > +static int tc_connector_get_modes(struct drm_connector *connector)
> > > > > > +{
> > > > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > > > +     struct edid *edid;
> > > > > > +     unsigned int count;
> > > > > > +
> > > > > > +     if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) {
> > > > > > +             count = tc->panel->funcs->get_modes(tc->panel, connector);
> > > > > > +             if (count > 0)
> > > > > > +                     return count;
> > > > > > +     }
> > > > > > +
> > > > > > +     edid = drm_get_edid(connector, tc->i2c->adapter);
> > > > > > +     if (!edid)
> > > > > > +             return 0;
> > > > > > +
> > > > > > +     drm_connector_update_edid_property(connector, edid);
> > > > > > +     count = drm_add_edid_modes(connector, edid);
> > > > > > +     kfree(edid);
> > > > > > +
> > > > > > +     return count;
> > > > > > +}
> > > > > > +
> > > > > > +static int tc_connector_mode_valid(struct drm_connector *connector,
> > > > > > +                                struct drm_display_mode *mode)
> > > > > > +{
> > > > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > > > +
> > > > > > +     /* Maximum pixel clock speed 135MHz-single-link/270MHz-dual-link */
> > > > > > +     if ((mode->clock > 135000 && tc->dual_link == 0) ||
> > > > > > +         (mode->clock > 270000 && tc->dual_link == 1))
> > > > > > +             return MODE_CLOCK_HIGH;
> > > > > > +
> > > > > > +     return MODE_OK;
> > > > > > +}
> > >
> > > This should be replaced by the bridge .mode_valid() operation, as it's
> > > related to the bridge, not the connector.
> > >
> > > > > > +
> > > > > > +static struct drm_encoder *
> > > > > > +tc_connector_best_encoder(struct drm_connector *connector)
> > > > > > +{
> > > > > > +     struct tc_data *tc = connector_to_tc(connector);
> > > > > > +
> > > > > > +     return tc->bridge.encoder;
> > > > > > +}
> > > > > > +
> > > > > > +static const struct drm_connector_helper_funcs tc_connector_helper_funcs = {
> > > > > > +     .get_modes = tc_connector_get_modes,
> > > > > > +     .mode_valid = tc_connector_mode_valid,
> > > > > > +     .best_encoder = tc_connector_best_encoder,
> > > > > > +};
> > > > > > +
> > > > > > +static const struct drm_connector_funcs tc_connector_funcs = {
> > > > > > +     .fill_modes = drm_helper_probe_single_connector_modes,
> > > > > > +     .destroy = drm_connector_cleanup,
> > > > > > +     .reset = drm_atomic_helper_connector_reset,
> > > > > > +     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> > > > > > +     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> > > > > > +};
> > > > > > +
> > > > > > +int tc358775_parse_dt(struct device_node *np, struct tc_data *tc)
> > > > > > +{
> > > > > > +     u32 num_lanes;
> > > > > > +     u8 dual_link, data_format;
> > > > > > +
> > > > > > +     of_property_read_u8(np, "tc,dual-link", &dual_link);
> > > > > > +     of_property_read_u8(np, "tc,data-format", &data_format);
> > > > > > +     of_property_read_u32(np, "tc,dsi-lanes", &num_lanes);
> > > > > > +
> > > > > > +     if (num_lanes < 1 || num_lanes > 4)
> > > > > > +             return -EINVAL;
> > > > > > +
> > > > > > +     tc->num_dsi_lanes = num_lanes;
> > > > > > +     tc->dual_link = dual_link;
> > > > > > +     tc->data_format = data_format;
> > > > > > +
> > > > > > +     tc->host_node = of_graph_get_remote_node(np, 0, 0);
> > > > > > +     if (!tc->host_node)
> > > > > > +             return -ENODEV;
> > > > > > +
> > > > > > +     of_node_put(tc->host_node);
> > > > > > +
> > > > > > +     return 0;
> > > > > > +}
> > > > > > +
> > > > > > +int tc358775_attach_dsi(struct tc_data *tc)
> > > > > > +{
> > > > > > +     struct device *dev = &tc->i2c->dev;
> > > > > > +     struct mipi_dsi_host *host;
> > > > > > +     struct mipi_dsi_device *dsi;
> > > > > > +     int ret = 0;
> > > > > > +     const struct mipi_dsi_device_info info = { .type = "tc358775",
> > > > > > +                                                     .channel = 0,
> > > > > > +                                                     .node = NULL,
> > > > > > +                                             };
> > > > > > +
> > > > > > +     host = of_find_mipi_dsi_host_by_node(tc->host_node);
> > > > > > +     if (!host) {
> > > > > > +             dev_err(dev, "failed to find dsi host\n");
> > > > > > +             return -EPROBE_DEFER;
> > > > > > +     }
> > > > > > +
> > > > > > +     dsi = mipi_dsi_device_register_full(host, &info);
> > > > > > +     if (IS_ERR(dsi)) {
> > > > > > +             dev_err(dev, "failed to create dsi device\n");
> > > > > > +             ret = PTR_ERR(dsi);
> > > > > > +             goto err_dsi_device;
> > > > > > +     }
> > > > > > +
> > > > > > +     tc->dsi = dsi;
> > > > > > +
> > > > > > +     dsi->lanes = tc->num_dsi_lanes;
> > > > > > +     dsi->format = MIPI_DSI_FMT_RGB888;
> > > > > > +     dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> > > > > > +
> > > > > > +     ret = mipi_dsi_attach(dsi);
> > > > > > +     if (ret < 0) {
> > > > > > +             dev_err(dev, "failed to attach dsi to host\n");
> > > > > > +             goto err_dsi_attach;
> > > > > > +     }
> > > > > > +
> > > > > > +     return 0;
> > > > > > +
> > > > > > +err_dsi_attach:
> > > > > > +     mipi_dsi_device_unregister(dsi);
> > > > > > +err_dsi_device:
> > > > > > +     return ret;
> > > > > > +}
> > > > > > +
> > > > > > +static int tc_bridge_attach(struct drm_bridge *bridge)
> > > > > > +{
> > > > > > +     struct tc_data *tc = bridge_to_tc(bridge);
> > > > > > +     struct drm_device *drm = bridge->dev;
> > > > > > +     int ret;
> > > > > > +
> > > > > > +     /* Create LVDS connector */
> > > > > > +     drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs);
> > > > > > +     ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs,
> > > > > > +                              DRM_MODE_CONNECTOR_LVDS);
> > > > > > +     if (ret)
> > > > > > +             return ret;
> > > > > > +
> > > > > > +     if (tc->panel)
> > > > > > +             drm_panel_attach(tc->panel, &tc->connector);
> > > > > > +
> > > > > > +     drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder);
> > > > > > +
> > > > > > +     ret = tc358775_attach_dsi(tc);
> > > > >
> > > > > Ignored retval.
> > > > >
> > > > > > +
> > > > > > +     return 0;
> > > > > > +}
> > > > > > +
> > > > > > +static const struct drm_bridge_funcs tc_bridge_funcs = {
> > > > > > +     .attach = tc_bridge_attach,
> > > > > > +     .pre_enable = tc_bridge_pre_enable,
> > > > > > +     .enable = tc_bridge_enable,
> > > > > > +     .disable = tc_bridge_disable,
> > > > > > +     .post_disable = tc_bridge_post_disable,
> > > > > > +};
> > > > > > +
> > > > > > +static const struct regmap_config tc_regmap_config = {
> > > > > > +     .name = "tc358775",
> > > > > > +     .reg_bits = 16,
> > > > > > +     .val_bits = 32,
> > > > > > +     .reg_stride = 4,
> > > > > > +     .max_register = 0x05A8,
> > > > > > +     .cache_type = REGCACHE_RBTREE,
> > > > > > +     .reg_format_endian = REGMAP_ENDIAN_BIG,
> > > > > > +     .val_format_endian = REGMAP_ENDIAN_LITTLE,
> > > > > > +};
> > > > > > +
> > > > > > +static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id)
> > > > > > +{
> > > > > > +     struct device *dev = &client->dev;
> > > > > > +     struct tc_data *tc;
> > > > > > +     int ret;
> > > > > > +     unsigned int i;
> > > > > > +
> > > > > > +     tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL);
> > > > > > +     if (!tc)
> > > > > > +             return -ENOMEM;
> > > > > > +
> > > > > > +     tc->dev = dev;
> > > > > > +     tc->i2c = client;
> > > > > > +     tc->status = connector_status_connected;
> > > > > > +
> > > > > > +     /* port@1 is the output port */
> > > > > > +     ret = drm_of_find_panel_or_bridge(dev->of_node, 1, 0, &tc->panel, NULL);
> > > > > > +     if (ret && ret != -ENODEV)
> > > > > > +             return ret;
> > >
> > > You should support cases where the next device is a bridge. I recommand
> > > wrapping the panel in a drm_panel_bridge with drm_panel_bridge_add(),
> > > and then handling the next component as a bridge in all code paths. This
> > > will allow removing manual enable/disable of panels above, as bridge
> > > chaining is handled automatically. drm_panel_bridge creates a
> > > drm_connector, so you can drop your manual connector implementation
> > > here, simplifying the code.
> >
> > i am not clear on this drm_panel_bridge_add() usage, please
> > clarify/any reference would be helpful.
>
> See drivers/gpu/drm/bridge/lvds-codec.c for instance. Note that you
> should not used the *_typed() version of drm_panel_bridge_add in new
> drivers, you should instead use drm_panel_bridge_add() or
> devm_drm_panel_bridge_add().
>
> > > > > > +
> > > > > > +     ret = tc358775_parse_dt(dev->of_node, tc);
> > > > > > +     if (ret)
> > > > > > +             return ret;
> > > > > > +
> > > > > > +     for (i = 0; i < ARRAY_SIZE(tc->supplies); i++)
> > > > > > +             tc->supplies[i].supply = regulator_names[i];
> > > > > > +
> > > > > > +     ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tc->supplies),
> > > > > > +                                   tc->supplies);
> > > > > > +     if (ret < 0)
> > > > > > +             dev_err(dev, "failed to init regulator, ret=%d\n", ret);
> > > > > > +
> > > > > > +     tc->stby_gpio = devm_gpiod_get(dev, "stby", GPIOD_OUT_HIGH);
> > > > > > +     if (IS_ERR(tc->stby_gpio)) {
> > > > > > +             ret = PTR_ERR(tc->stby_gpio);
> > > > > > +             dev_err(dev, "cannot get stby-gpio %d\n", ret);
> > > > > > +             return ret;
> > > > > > +     }
> > > > > > +
> > > > > > +     tc->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> > > > > > +     if (IS_ERR(tc->reset_gpio)) {
> > > > > > +             ret = PTR_ERR(tc->reset_gpio);
> > > > > > +             dev_err(dev, "cannot get reset-gpios %d\n", ret);
> > > > > > +             return ret;
> > > > > > +     }
> > > > > > +
> > > > > > +     tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config);
> > > > > > +     if (IS_ERR(tc->regmap)) {
> > > > > > +             ret = PTR_ERR(tc->regmap);
> > > > > > +             dev_err(dev, "Failed to initialize regmap: %d\n", ret);
> > > > > > +             return ret;
> > > > > > +     }
> > > > > > +
> > > > > > +     tc->bridge.funcs = &tc_bridge_funcs;
> > > > > > +     tc->bridge.of_node = dev->of_node;
> > > > > > +     drm_bridge_add(&tc->bridge);
> > > > > > +
> > > > > > +     i2c_set_clientdata(client, tc);
> > > > > > +
> > > > > > +     return 0;
> > > > > > +}
> > > > > > +
> > > > > > +static int tc_remove(struct i2c_client *client)
> > > > > > +{
> > > > > > +     struct tc_data *tc = i2c_get_clientdata(client);
> > > > > > +
> > > > > > +     drm_bridge_remove(&tc->bridge);
> > > > > > +
> > > > > > +     return 0;
> > > > > > +}
> > > > > > +
> > > > > > +static const struct i2c_device_id tc358775_i2c_ids[] = {
> > > > > > +     { "tc358775", 0 },
> > > > > > +     { }
> > > > > > +};
> > > > > > +MODULE_DEVICE_TABLE(i2c, tc358775_i2c_ids);
> > > > > > +
> > > > > > +static const struct of_device_id tc358775_of_ids[] = {
> > > > > > +     { .compatible = "toshiba,tc358775", },
> > > > > > +     { }
> > > > > > +};
> > > > > > +MODULE_DEVICE_TABLE(of, tc358775_of_ids);
> > > > > > +
> > > > > > +static struct i2c_driver tc358775_driver = {
> > > > > > +     .driver = {
> > > > > > +             .name = "tc358775",
> > > > > > +             .of_match_table = tc358775_of_ids,
> > > > > > +     },
> > > > > > +     .id_table = tc358775_i2c_ids,
> > > > > > +     .probe = tc_probe,
> > > > > > +     .remove = tc_remove,
> > > > > > +};
> > > > > > +module_i2c_driver(tc358775_driver);
> > > > > > +
> > > > > > +MODULE_AUTHOR("Vinay Simha BN <vinaysimha@inforcecomputing.com>");
> > > > > > +MODULE_DESCRIPTION("tc358775 LVDS encoder driver");
> > > > >
> > > > > maybe  better:
> > > > >
> > > > > tc358775 DSI/LVDS bridge driver
> > > > >
> > > > > > +MODULE_LICENSE("GPL v2");
>
> --
> Regards,
>
> Laurent Pinchart



-- 
regards,
vinaysimha

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2020-03-15 15:30 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
     [not found] <CGME20200228080017eucas1p2e311cd1b71d74ef2c92a5518f69db89c@eucas1p2.samsung.com>
2020-02-27 14:03 ` [PATCH] display/bridge: dsi2lvds tc358775 driver Vinay Simha BN
2020-03-03 15:09   ` Andrzej Hajda
2020-03-06 12:36     ` Vinay Simha B N
2020-03-06 13:32       ` Laurent Pinchart
2020-03-11 10:00         ` Vinay Simha B N
2020-03-11 10:00           ` Vinay Simha B N
2020-03-12 14:31           ` Laurent Pinchart
2020-03-15 15:30             ` Vinay Simha B N

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