LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Maxime Ripard <maxime@cerno.tech>
To: dri-devel@lists.freedesktop.org,
	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>
Cc: Maxime Ripard <mripard@kernel.org>, Emma Anholt <emma@anholt.net>,
	linux-kernel@vger.kernel.org,
	Nicolas Saenz Julienne <nsaenz@kernel.org>,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	Phil Elwell <phil@raspberrypi.com>,
	Tim Gover <tim.gover@raspberrypi.com>,
	Dom Cobley <dom@raspberrypi.com>,
	bcm-kernel-feedback-list@broadcom.com,
	linux-rpi-kernel@lists.infradead.org
Subject: [PATCH v7 07/10] drm/vc4: Leverage the load tracker on the BCM2711
Date: Thu, 19 Aug 2021 11:51:16 +0200	[thread overview]
Message-ID: <20210819095119.689945-8-maxime@cerno.tech> (raw)
In-Reply-To: <20210819095119.689945-1-maxime@cerno.tech>

The load tracker was initially designed to report and warn about a load
too high for the HVS. To do so, it computes for each plane the impact
it's going to have on the HVS, and will warn (if it's enabled) if we go
over what the hardware can process.

While the limits being used are a bit irrelevant to the BCM2711, the
algorithm to compute the HVS load will be one component used in order to
compute the core clock rate on the BCM2711.

Let's remove the hooks to prevent the load tracker to do its
computation, but since we don't have the same limits, don't check them
against them, and prevent the debugfs file to enable it from being
created.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_debugfs.c |  7 +++++--
 drivers/gpu/drm/vc4/vc4_drv.h     |  3 ---
 drivers/gpu/drm/vc4/vc4_kms.c     | 16 +++++-----------
 drivers/gpu/drm/vc4/vc4_plane.c   |  5 -----
 4 files changed, 10 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_debugfs.c b/drivers/gpu/drm/vc4/vc4_debugfs.c
index 6da22af4ee91..ba2d8ea562af 100644
--- a/drivers/gpu/drm/vc4/vc4_debugfs.c
+++ b/drivers/gpu/drm/vc4/vc4_debugfs.c
@@ -7,6 +7,7 @@
 #include <linux/circ_buf.h>
 #include <linux/ctype.h>
 #include <linux/debugfs.h>
+#include <linux/platform_device.h>
 
 #include "vc4_drv.h"
 #include "vc4_regs.h"
@@ -26,8 +27,10 @@ vc4_debugfs_init(struct drm_minor *minor)
 	struct vc4_dev *vc4 = to_vc4_dev(minor->dev);
 	struct vc4_debugfs_info_entry *entry;
 
-	debugfs_create_bool("hvs_load_tracker", S_IRUGO | S_IWUSR,
-			    minor->debugfs_root, &vc4->load_tracker_enabled);
+	if (!of_device_is_compatible(vc4->hvs->pdev->dev.of_node,
+				     "brcm,bcm2711-vc5"))
+		debugfs_create_bool("hvs_load_tracker", S_IRUGO | S_IWUSR,
+				    minor->debugfs_root, &vc4->load_tracker_enabled);
 
 	list_for_each_entry(entry, &vc4->debugfs_list, link) {
 		drm_debugfs_create_files(&entry->info, 1,
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
index 220c5e81ba2c..95a1eb7ebf90 100644
--- a/drivers/gpu/drm/vc4/vc4_drv.h
+++ b/drivers/gpu/drm/vc4/vc4_drv.h
@@ -202,9 +202,6 @@ struct vc4_dev {
 
 	int power_refcount;
 
-	/* Set to true when the load tracker is supported. */
-	bool load_tracker_available;
-
 	/* Set to true when the load tracker is active. */
 	bool load_tracker_enabled;
 
diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c
index f0b3e4cf5bce..ca688115381e 100644
--- a/drivers/gpu/drm/vc4/vc4_kms.c
+++ b/drivers/gpu/drm/vc4/vc4_kms.c
@@ -551,9 +551,6 @@ static int vc4_load_tracker_atomic_check(struct drm_atomic_state *state)
 	struct drm_plane *plane;
 	int i;
 
-	if (!vc4->load_tracker_available)
-		return 0;
-
 	priv_state = drm_atomic_get_private_obj_state(state,
 						      &vc4->load_tracker);
 	if (IS_ERR(priv_state))
@@ -628,9 +625,6 @@ static void vc4_load_tracker_obj_fini(struct drm_device *dev, void *unused)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
 
-	if (!vc4->load_tracker_available)
-		return;
-
 	drm_atomic_private_obj_fini(&vc4->load_tracker);
 }
 
@@ -638,9 +632,6 @@ static int vc4_load_tracker_obj_init(struct vc4_dev *vc4)
 {
 	struct vc4_load_tracker_state *load_state;
 
-	if (!vc4->load_tracker_available)
-		return 0;
-
 	load_state = kzalloc(sizeof(*load_state), GFP_KERNEL);
 	if (!load_state)
 		return -ENOMEM;
@@ -868,9 +859,12 @@ int vc4_kms_load(struct drm_device *dev)
 					      "brcm,bcm2711-vc5");
 	int ret;
 
+	/*
+	 * The limits enforced by the load tracker aren't relevant for
+	 * the BCM2711, but the load tracker computations are used for
+	 * the core clock rate calculation.
+	 */
 	if (!is_vc5) {
-		vc4->load_tracker_available = true;
-
 		/* Start with the load tracker enabled. Can be
 		 * disabled through the debugfs load_tracker file.
 		 */
diff --git a/drivers/gpu/drm/vc4/vc4_plane.c b/drivers/gpu/drm/vc4/vc4_plane.c
index 19161b6ab27f..ac761c683663 100644
--- a/drivers/gpu/drm/vc4/vc4_plane.c
+++ b/drivers/gpu/drm/vc4/vc4_plane.c
@@ -529,11 +529,6 @@ static void vc4_plane_calc_load(struct drm_plane_state *state)
 	struct vc4_plane_state *vc4_state;
 	struct drm_crtc_state *crtc_state;
 	unsigned int vscale_factor;
-	struct vc4_dev *vc4;
-
-	vc4 = to_vc4_dev(state->plane->dev);
-	if (!vc4->load_tracker_available)
-		return;
 
 	vc4_state = to_vc4_plane_state(state);
 	crtc_state = drm_atomic_get_existing_crtc_state(state->state,
-- 
2.31.1


  parent reply	other threads:[~2021-08-19  9:51 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-19  9:51 [PATCH v7 00/10] drm/vc4: hdmi: Support the 4k @ 60Hz modes Maxime Ripard
2021-08-19  9:51 ` [PATCH v7 01/10] drm/vc4: hdmi: Remove the DDC probing for status detection Maxime Ripard
2021-08-19  9:51 ` [PATCH v7 02/10] drm/vc4: hdmi: Fix HPD GPIO detection Maxime Ripard
2021-08-19  9:51 ` [PATCH v7 03/10] drm/vc4: Make vc4_crtc_get_encoder public Maxime Ripard
2021-08-19  9:51 ` [PATCH v7 04/10] drm/vc4: crtc: Add encoder to vc4_crtc_config_pv prototype Maxime Ripard
2021-08-19  9:51 ` [PATCH v7 05/10] drm/vc4: crtc: Rework the encoder retrieval code (again) Maxime Ripard
2021-08-19  9:51 ` [PATCH v7 06/10] drm/vc4: crtc: Add some logging Maxime Ripard
2021-08-19  9:51 ` Maxime Ripard [this message]
2021-08-19  9:51 ` [PATCH v7 08/10] drm/vc4: hdmi: Raise the maximum clock rate Maxime Ripard
2021-08-19  9:51 ` [PATCH v7 09/10] drm/vc4: hdmi: Enable the scrambler on reconnection Maxime Ripard
2021-08-19  9:51 ` [PATCH v7 10/10] drm/vc4: Increase the core clock based on HVS load Maxime Ripard

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210819095119.689945-8-maxime@cerno.tech \
    --to=maxime@cerno.tech \
    --cc=airlied@linux.ie \
    --cc=bcm-kernel-feedback-list@broadcom.com \
    --cc=daniel.vetter@intel.com \
    --cc=dave.stevenson@raspberrypi.com \
    --cc=dom@raspberrypi.com \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=emma@anholt.net \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-rpi-kernel@lists.infradead.org \
    --cc=maarten.lankhorst@linux.intel.com \
    --cc=mripard@kernel.org \
    --cc=nsaenz@kernel.org \
    --cc=phil@raspberrypi.com \
    --cc=tim.gover@raspberrypi.com \
    --cc=tzimmermann@suse.de \
    --subject='Re: [PATCH v7 07/10] drm/vc4: Leverage the load tracker on the BCM2711' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).