linux-kernel - [PATCH v2 1/2] drm/bridge: adv7511: Move adv711_dsi_config_timing_gen() into adv7511_mode

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Message-ID: <20250528070452.901183-2-tommaso.merciai.xr@bp.renesas.com>
Date: Wed, 28 May 2025 09:04:37 +0200
From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
To: tomm.merciai@...il.com
Cc: linux-renesas-soc@...r.kernel.org,
	biju.das.jz@...renesas.com,
	Tommaso Merciai <tommaso.merciai.xr@...renesas.com>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
	Adam Ford <aford173@...il.com>,
	Douglas Anderson <dianders@...omium.org>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 1/2] drm/bridge: adv7511: Move adv711_dsi_config_timing_gen() into adv7511_mode_set()

adv7511_mode_set() currently updates only the sync registers of the ADV
bridge. At the end, drm_mode_copy() updates the current mode, but the
horizontal and vertical porch registers of the ADV bridge still retain
values from the old mode.

Move adv7511_dsi_config_timing_gen() into adv7511_mode_set() to ensure
the horizontal and vertical porch registers are correctly updated.

Fixes: ae01d3183d2763ed ("drm/bridge: adv7511: switch to the HDMI connector helpers")
Reported-by: Biju Das <biju.das.jz@...renesas.com>
Closes: https://lore.kernel.org/all/aDB8bD6cF7qiSpKd@tom-desktop/
Signed-off-by: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
---
v1->v2:
 - Fixed Fixes tag.
 - Moved adv711_dsi_config_timing_gen() into adv7511_mode_set()
 - Updated commit body + commit msg + content

 drivers/gpu/drm/bridge/adv7511/adv7511.h     | 2 ++
 drivers/gpu/drm/bridge/adv7511/adv7511_drv.c | 4 ++++
 drivers/gpu/drm/bridge/adv7511/adv7533.c     | 5 +----
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511.h b/drivers/gpu/drm/bridge/adv7511/adv7511.h
index 90c9a3da2406..6150d57ff9af 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511.h
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511.h
@@ -422,6 +422,8 @@ int adv7533_patch_cec_registers(struct adv7511 *adv);
 int adv7533_attach_dsi(struct adv7511 *adv);
 int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv);
 
+void adv7511_dsi_config_timing_gen(struct adv7511 *adv);
+
 #ifdef CONFIG_DRM_I2C_ADV7511_AUDIO
 int adv7511_hdmi_audio_startup(struct drm_connector *connector,
 			       struct drm_bridge *bridge);
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
index 8b7548448615..b58e9e2c6489 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7511_drv.c
@@ -738,6 +738,10 @@ static void adv7511_mode_set(struct adv7511 *adv7511,
 
 	drm_mode_copy(&adv7511->curr_mode, adj_mode);
 
+	/* Update horizontal/vertical porch params */
+	if (adv7511->info->has_dsi && adv7511->use_timing_gen)
+		adv7511_dsi_config_timing_gen(adv7511);
+
 	/*
 	 * TODO Test first order 4:2:2 to 4:4:4 up conversion method, which is
 	 * supposed to give better results.
diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c
index b12d422343fc..df8180e6d733 100644
--- a/drivers/gpu/drm/bridge/adv7511/adv7533.c
+++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c
@@ -24,7 +24,7 @@ static const struct reg_sequence adv7533_cec_fixed_registers[] = {
 	{ 0x05, 0xc8 },
 };
 
-static void adv7511_dsi_config_timing_gen(struct adv7511 *adv)
+void adv7511_dsi_config_timing_gen(struct adv7511 *adv)
 {
 	struct mipi_dsi_device *dsi = adv->dsi;
 	struct drm_display_mode *mode = &adv->curr_mode;
@@ -67,9 +67,6 @@ void adv7533_dsi_power_on(struct adv7511 *adv)
 {
 	struct mipi_dsi_device *dsi = adv->dsi;
 
-	if (adv->use_timing_gen)
-		adv7511_dsi_config_timing_gen(adv);
-
 	/* set number of dsi lanes */
 	regmap_write(adv->regmap_cec, 0x1c, dsi->lanes << 4);
 
-- 
2.43.0