drm/bridge: it6505: Drop EDID cache on bridge power off

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: 11feaef69d ("drm/bridge: it6505: Add caching for EDID")
Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240926092931.3870342-3-treapking@chromium.org

This commit is contained in:

Pin-yen Lin

2024-09-26 17:29:09 +08:00

committed by

Douglas Anderson

parent 00ae002116

commit 574c558ddb

1 changed files with 2 additions and 0 deletions

									
										drivers/gpu/drm/bridge/ite-it6505.c
									
		+2
		
												View File
												
				@@ -3107,6 +3107,8 @@ 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);

				}