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From: Maxime Ripard <maxime@cerno.tech>
To: Jonas Karlman <jonas@kwiboo.se>, Sam Ravnborg <sam@ravnborg.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Daniel Vetter <daniel.vetter@intel.com>,
	David Airlie <airlied@linux.ie>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Maxime Ripard <maxime@cerno.tech>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Robert Foss <robert.foss@linaro.org>,
	Andrzej Hajda <a.hajda@samsung.com>
Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: [PATCH v3 6/8] drm/bridge: ps8640: Register and attach our DSI device at probe
Date: Mon, 23 Aug 2021 10:47:21 +0200	[thread overview]
Message-ID: <20210823084723.1493908-7-maxime@cerno.tech> (raw)
In-Reply-To: <20210823084723.1493908-1-maxime@cerno.tech>

In order to avoid any probe ordering issue, the best practice is to move
the secondary MIPI-DSI device registration and attachment to the
MIPI-DSI host at probe time. Let's do this.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/bridge/parade-ps8640.c | 93 ++++++++++++++------------
 1 file changed, 51 insertions(+), 42 deletions(-)

diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
index 794c9516b05d..37f7d166a3c6 100644
--- a/drivers/gpu/drm/bridge/parade-ps8640.c
+++ b/drivers/gpu/drm/bridge/parade-ps8640.c
@@ -213,52 +213,10 @@ static int ps8640_bridge_attach(struct drm_bridge *bridge,
 				enum drm_bridge_attach_flags flags)
 {
 	struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
-	struct device *dev = &ps_bridge->page[0]->dev;
-	struct device_node *in_ep, *dsi_node;
-	struct mipi_dsi_device *dsi;
-	struct mipi_dsi_host *host;
-	int ret;
-	const struct mipi_dsi_device_info info = { .type = "ps8640",
-						   .channel = 0,
-						   .node = NULL,
-						 };
 
 	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
 		return -EINVAL;
 
-	/* port@0 is ps8640 dsi input port */
-	in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
-	if (!in_ep)
-		return -ENODEV;
-
-	dsi_node = of_graph_get_remote_port_parent(in_ep);
-	of_node_put(in_ep);
-	if (!dsi_node)
-		return -ENODEV;
-
-	host = of_find_mipi_dsi_host_by_node(dsi_node);
-	of_node_put(dsi_node);
-	if (!host)
-		return -ENODEV;
-
-	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
-	if (IS_ERR(dsi)) {
-		dev_err(dev, "failed to create dsi device\n");
-		ret = PTR_ERR(dsi);
-		return ret;
-	}
-
-	ps_bridge->dsi = dsi;
-
-	dsi->host = host;
-	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
-			  MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
-	dsi->format = MIPI_DSI_FMT_RGB888;
-	dsi->lanes = DP_NUM_LANES;
-	ret = devm_mipi_dsi_attach(dev, dsi);
-	if (ret)
-		return ret;
-
 	/* Attach the panel-bridge to the dsi bridge */
 	return drm_bridge_attach(bridge->encoder, ps_bridge->panel_bridge,
 				 &ps_bridge->bridge, flags);
@@ -305,6 +263,53 @@ static const struct drm_bridge_funcs ps8640_bridge_funcs = {
 	.pre_enable = ps8640_pre_enable,
 };
 
+static int ps8640_bridge_host_attach(struct device *dev, struct ps8640 *ps_bridge)
+{
+	struct device_node *in_ep, *dsi_node;
+	struct mipi_dsi_device *dsi;
+	struct mipi_dsi_host *host;
+	int ret;
+	const struct mipi_dsi_device_info info = { .type = "ps8640",
+						   .channel = 0,
+						   .node = NULL,
+						 };
+
+	/* port@0 is ps8640 dsi input port */
+	in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
+	if (!in_ep)
+		return -ENODEV;
+
+	dsi_node = of_graph_get_remote_port_parent(in_ep);
+	of_node_put(in_ep);
+	if (!dsi_node)
+		return -ENODEV;
+
+	host = of_find_mipi_dsi_host_by_node(dsi_node);
+	of_node_put(dsi_node);
+	if (!host)
+		return -EPROBE_DEFER;
+
+	dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
+	if (IS_ERR(dsi)) {
+		dev_err(dev, "failed to create dsi device\n");
+		return PTR_ERR(dsi);
+	}
+
+	ps_bridge->dsi = dsi;
+
+	dsi->host = host;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+			  MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->lanes = DP_NUM_LANES;
+
+	ret = devm_mipi_dsi_attach(dev, dsi);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static int ps8640_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
@@ -371,6 +376,10 @@ static int ps8640_probe(struct i2c_client *client)
 
 	drm_bridge_add(&ps_bridge->bridge);
 
+	ret = ps8640_bridge_host_attach(dev, ps_bridge);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
-- 
2.31.1


  parent reply	other threads:[~2021-08-23  8:47 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23  8:47 [PATCH v3 0/8] drm/bridge: Make panel and bridge probe order consistent Maxime Ripard
2021-08-23  8:47 ` [PATCH v3 1/8] drm/bridge: Add documentation sections Maxime Ripard
2021-08-24  8:06   ` Andrzej Hajda
2021-08-23  8:47 ` [PATCH v3 2/8] drm/bridge: Document the probe issue with MIPI-DSI bridges Maxime Ripard
2021-08-23 16:32   ` Andrzej Hajda
2021-08-26  8:56     ` Maxime Ripard
2021-08-23  8:47 ` [PATCH v3 3/8] drm/mipi-dsi: Create devm device registration Maxime Ripard
2021-08-24 13:03   ` Andrzej Hajda
2021-08-23  8:47 ` [PATCH v3 4/8] drm/mipi-dsi: Create devm device attachment Maxime Ripard
2021-08-24 13:04   ` Andrzej Hajda
2021-08-23  8:47 ` [PATCH v3 5/8] drm/bridge: ps8640: Switch to devm MIPI-DSI helpers Maxime Ripard
2021-08-23  8:47 ` Maxime Ripard [this message]
2021-08-24 13:14   ` [PATCH v3 6/8] drm/bridge: ps8640: Register and attach our DSI device at probe Andrzej Hajda
2021-08-23  8:47 ` [PATCH v3 7/8] drm/bridge: sn65dsi83: Switch to devm MIPI-DSI helpers Maxime Ripard
2021-08-23  8:47 ` [PATCH v3 8/8] drm/bridge: sn65dsi83: Register and attach our DSI device at probe Maxime Ripard

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