linux-kernel - Re: [PATCH] drm/bridge: anx7625: Ensure bridge is suspended in disable()

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Date: Thu, 18 Jan 2024 09:30:00 -0800
From: Doug Anderson <dianders@...omium.org>
To: Hsin-Yi Wang <hsinyi@...omium.org>
Cc: dri-devel@...ts.freedesktop.org, 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>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Xin Ji <xji@...logixsemi.com>, Pin-yen Lin <treapking@...omium.org>, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: anx7625: Ensure bridge is suspended in disable()

Hi,

On Wed, Jan 17, 2024 at 5:59 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
> Similar to commit 26db46bc9c67 ("drm/bridge: parade-ps8640: Ensure bridge
> is suspended in .post_disable()"). Add a mutex to ensure that aux transfer
> won't race with atomic_disable by holding the PM reference and prevent
> the bridge from suspend.
>
> Also we need to use pm_runtime_put_sync_suspend() to suspend the bridge
> instead of idle with pm_runtime_put_sync().
>
> Fixes: 3203e497eb76 ("drm/bridge: anx7625: Synchronously run runtime suspend.")
> Fixes: adca62ec370c ("drm/bridge: anx7625: Support reading edid through aux channel")
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> Tested-by: Xuxin Xiong <xuxinxiong@...qin.corp-partner.google.com>
> ---
>  drivers/gpu/drm/bridge/analogix/anx7625.c | 7 ++++++-
>  drivers/gpu/drm/bridge/analogix/anx7625.h | 2 ++
>  2 files changed, 8 insertions(+), 1 deletion(-)

This looks good to me.

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

I guess this started showing up more because of commit 49ddab089611
("drm/panel-edp: use put_sync in unprepare"), right? Since that's a
recent commit then that means there's probably a little more urgency
in getting this landed. That being said, it feels like it would be
most legit to allow this to hang out on the list for a few days before
landing. I'll aim for early next week unless someone else has any
comments.

I guess we should see if we need to do something similar for
ti-sn65dsi86 too since I could imagine it having similar problems.