linux-kernel - Re: [PATCH v2 1/2] drm/bridge: anx7625: Drop EDID cache on bridge power off

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Message-ID: <CAD=FV=V5Yf1shF2eKCYOxu=x48cScTh8WXkcm4Xvr1qJnSn1Kg@mail.gmail.com>
Date: Thu, 26 Sep 2024 10:15:32 -0700
From: Doug Anderson <dianders@...omium.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, 
	dri-devel@...ts.freedesktop.org, Sam Ravnborg <sam@...nborg.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v2 1/2] drm/bridge: anx7625: Drop EDID cache on bridge
 power off

Hi,

On Thu, Sep 26, 2024 at 2:29 AM Pin-yen Lin <treapking@...omium.org> 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: 8bdfc5dae4e3 ("drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP")
> Signed-off-by: Pin-yen Lin <treapking@...omium.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

I don't think it needs a re-spin, but for future reference you're
always supposed to move your own Signed-off-by to the bottom whenever
you "touch" a patch. Thus yours should be below Dmitry's tag.

In any case,

Reviewed-by: Douglas Anderson <dianders@...omium.org>

If these haven't been applied and there's no other feedback at the end
of next week I'll plan to apply both this and the next patch to
drm-misc-fixes.


-Doug