linux-kernel - Re: [PATCH 2/2] drm/bridge: it6505: Drop EDID cache on bridge power off

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Message-ID: <pq3dz7ldjfzs3mu4hkcgrlrugxgkgpzfxg23jccl6bkcky65lq@7mbo3ebjzat6>
Date: Tue, 24 Sep 2024 09:53:20 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Pin-yen Lin <treapking@...omium.org>
Cc: 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>, linux-kernel@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>, 
	dri-devel@...ts.freedesktop.org, Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH 2/2] drm/bridge: it6505: Drop EDID cache on bridge power
 off

On Tue, Sep 24, 2024 at 11:51:47AM GMT, Pin-yen Lin wrote:
> 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@...omium.org>
> 
> ---
> 
>  drivers/gpu/drm/bridge/ite-it6505.c | 2 ++
>  1 file changed, 2 insertions(+)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry