linux-kernel - [PATCH 1/2] drm/bridge: anx7625: Drop EDID cache on bridge power off

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Message-ID: <20240924035231.1163670-2-treapking@chromium.org>
Date: Tue, 24 Sep 2024 11:51:46 +0800
From: Pin-yen Lin <treapking@...omium.org>
To: Xin Ji <xji@...logixsemi.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>
Cc: linux-kernel@...r.kernel.org,
	Sam Ravnborg <sam@...nborg.org>,
	dri-devel@...ts.freedesktop.org,
	Pin-yen Lin <treapking@...omium.org>,
	Douglas Anderson <dianders@...omium.org>
Subject: [PATCH 1/2] drm/bridge: anx7625: 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: 8bdfc5dae4e3 ("drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP")
Signed-off-by: Pin-yen Lin <treapking@...omium.org>
---

 drivers/gpu/drm/bridge/analogix/anx7625.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 88e4aa5830f3..b4c1f00f1c3d 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -2561,6 +2561,7 @@ static int __maybe_unused anx7625_runtime_pm_suspend(struct device *dev)
 	mutex_lock(&ctx->lock);
 
 	anx7625_stop_dp_work(ctx);
+	anx7625_remove_edid(ctx);
 	anx7625_power_standby(ctx);
 
 	mutex_unlock(&ctx->lock);
-- 
2.46.0.792.g87dc391469-goog