From 26dd231990b7d8b17d652af0734f81e93a9df503 Mon Sep 17 00:00:00 2001 From: Pin-yen Lin Date: Thu, 26 Sep 2024 17:29:09 +0800 Subject: [PATCH] drm/bridge: it6505: Drop EDID cache on bridge power off [ Upstream commit 574c558ddb68591c9a4b7a95e45e935ab22c0fc6 ] The bridge might miss the display change events when it's powered off. This happens when a user changes the external monitor when the system is suspended and the embedded controller doesn't not wake AP up. It's also observed that one DP-to-HDMI bridge doesn't work correctly when there is no EDID read after it is powered on. Drop the cache to force an EDID read after system resume to fix this. Fixes: 11feaef69d0c ("drm/bridge: it6505: Add caching for EDID") Signed-off-by: Pin-yen Lin Reviewed-by: Dmitry Baryshkov Reviewed-by: Douglas Anderson Signed-off-by: Douglas Anderson Link: https://patchwork.freedesktop.org/patch/msgid/20240926092931.3870342-3-treapking@chromium.org Signed-off-by: Sasha Levin --- drivers/gpu/drm/bridge/ite-it6505.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index 1e1c06fdf2064..bb449efac2f4e 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -3101,6 +3101,8 @@ static __maybe_unused int it6505_bridge_suspend(struct device *dev) { struct it6505 *it6505 = dev_get_drvdata(dev); + it6505_remove_edid(it6505); + return it6505_poweroff(it6505); } -- 2.47.2