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Message-ID: <CAD=FV=XFsSoUqkk8zhta1V-oT2AGGvUz=0qFWAcXiJ7m+nnATA@mail.gmail.com>
Date: Thu, 17 Nov 2022 13:14:33 -0800
From: Doug Anderson <dianders@...omium.org>
To: Drew Davenport <ddavenport@...omium.org>
Cc: dri-devel@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
David Airlie <airlied@...il.com>,
Sam Ravnborg <sam@...nborg.org>,
Thierry Reding <thierry.reding@...il.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] drm/panel-edp: Use ktime_get_boottime for delays
Hi,
On Thu, Nov 17, 2022 at 12:39 PM Drew Davenport <ddavenport@...omium.org> wrote:
>
> ktime_get is based on CLOCK_MONOTONIC which stops on suspend. On
> suspend, the time that the panel was powerd off is recorded with
> ktime_get, and on resume this time is compared to the current ktime_get
> time to determine if the driver should wait for the panel to power down
> completely before re-enabling it.
>
> Because we're using ktime_get, this delay doesn't account for the time
> that the device is suspended, during which the power down delay may have
> already elapsed.
>
> Change to use ktime_get_boottime throughout, which uses CLOCK_BOOTTIME
> which does not stop when suspended. This ensures that the resume path
> will not be delayed if the power off delay has already been met while
> the device is suspended.
>
> Signed-off-by: Drew Davenport <ddavenport@...omium.org>
>
> ---
>
> drivers/gpu/drm/panel/panel-edp.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
Reviewed-by: Douglas Anderson <dianders@...omium.org>
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