From 574c558ddb68591c9a4b7a95e45e935ab22c0fc6 Mon Sep 17 00:00:00 2001
From: Pin-yen Lin <treapking@chromium.org>
Date: Thu, 26 Sep 2024 17:29:09 +0800
Subject: [PATCH] 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: 11feaef69d0c ("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
---
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 f372c05360f2e..7ff17aa14b01e 100644
--- a/drivers/gpu/drm/bridge/ite-it6505.c
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -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);
}
--
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