linux-kernel - Re: [PATCH v2 2/2] drm/bridge: it6505: Drop EDID cache on bridge power off

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Message-ID: <CAD=FV=XTwjOwezAuD0_yFz01YyKBVPPTc=2bys5N+nrYJH91vQ@mail.gmail.com>
Date: Thu, 3 Oct 2024 13:29:57 -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 2/2] drm/bridge: it6505: 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: 11feaef69d0c ("drm/bridge: it6505: Add caching for EDID")
> Signed-off-by: Pin-yen Lin <treapking@...omium.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
>
> ---
>
> Changes in v2:
> - Collect review tags
>
>  drivers/gpu/drm/bridge/ite-it6505.c | 2 ++
>  1 file changed, 2 insertions(+)

Like with patch #1, meant to push to drm-misc-fixes but ended up on
drm-misc-next. Yell if this is a problem, but I think it should be OK.

[2/2] drm/bridge: it6505: Drop EDID cache on bridge power off
      commit: 574c558ddb68591c9a4b7a95e45e935ab22c0fc6

-Doug