[PATCH v3 12/14] drm/bridge: analogix_dp: Remove panel disabling and enabling in analogix_dp_set_bridge()

From: Damon Ding <damon.ding@rock-chips.com>
To: andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org
Cc: Laurent.pinchart@ideasonboard.com, jonas@kwiboo.se,
	jernej.skrabec@gmail.com, maarten.lankhorst@linux.intel.com,
	mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com,
	simona@ffwll.ch, jingoohan1@gmail.com, inki.dae@samsung.com,
	sw0312.kim@samsung.com, kyungmin.park@samsung.com,
	krzk@kernel.org, alim.akhtar@samsung.com, hjc@rock-chips.com,
	heiko@sntech.de, andy.yan@rock-chips.com,
	dmitry.baryshkov@oss.qualcomm.com, l.stach@pengutronix.de,
	dianders@chromium.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org,
	linux-rockchip@lists.infradead.org,
	Damon Ding <damon.ding@rock-chips.com>
Subject: [PATCH v3 12/14] drm/bridge: analogix_dp: Remove panel disabling and enabling in analogix_dp_set_bridge()
Date: Thu, 24 Jul 2025 16:03:02 +0800	[thread overview]
Message-ID: <20250724080304.3572457-13-damon.ding@rock-chips.com> (raw)
In-Reply-To: <20250724080304.3572457-1-damon.ding@rock-chips.com>

The &drm_panel_funcs.enable() and &drm_panel_funcs.disable() mainly
help turn on/off the backlight to make the image visible, and the
backlight operations are even needless if drm_panel_of_backlight() or
drm_panel_dp_aux_backlight() is applied, in which case the enabling
and disabling process just add necessary delays.

Therefore, it should make sense to remove panel disabling and move
panel enabling after analogix_dp_set_bridge() finished.

Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
index b67087639609..f4807ef337e6 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -840,9 +840,6 @@ static int analogix_dp_commit(struct analogix_dp_device *dp)
 {
 	int ret;
 
-	/* Keep the panel disabled while we configure video */
-	drm_panel_disable(dp->plat_data->panel);
-
 	ret = analogix_dp_train_link(dp);
 	if (ret) {
 		dev_err(dp->dev, "unable to do link train, ret=%d\n", ret);
@@ -862,9 +859,6 @@ static int analogix_dp_commit(struct analogix_dp_device *dp)
 		return ret;
 	}
 
-	/* Safe to enable the panel now */
-	drm_panel_enable(dp->plat_data->panel);
-
 	/* Check whether panel supports fast training */
 	ret = analogix_dp_fast_link_train_detection(dp);
 	if (ret)
@@ -1242,6 +1236,7 @@ static void analogix_dp_bridge_atomic_enable(struct drm_bridge *bridge,
 	while (timeout_loop < MAX_PLL_LOCK_LOOP) {
 		if (analogix_dp_set_bridge(dp) == 0) {
 			dp->dpms_mode = DRM_MODE_DPMS_ON;
+			drm_panel_enable(dp->plat_data->panel);
 			return;
 		}
 		dev_err(dp->dev, "failed to set bridge, retry: %d\n",
-- 
2.34.1


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