linux-kernel - Re: [PATCH] drm/panel-simple: Power the panel when probing DP AUX backlight

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Date:   Thu, 15 Jul 2021 08:05:31 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Rajeev Nandan <rajeevny@...eaurora.org>,
        Lyude Paul <lyude@...hat.com>,
        Robert Foss <robert.foss@...aro.org>
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Sam Ravnborg <sam@...nborg.org>,
        Thierry Reding <thierry.reding@...il.com>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/panel-simple: Power the panel when probing DP AUX backlight

Hi,

On Wed, Jul 14, 2021 at 9:34 AM Douglas Anderson <dianders@...omium.org> wrote:
>
> When I tried booting up a device that needed the DP AUX backlight, I
> found an error in the logs:
>   panel-simple-dp-aux: probe of aux-ti_sn65dsi86.aux.0 failed with error -110
>
> The aux transfers were failing because the panel wasn't powered. Just
> like when reading the EDID we need to power the panel when trying to
> talk to it. Add the needed pm_runtime calls.
>
> After I do this I can successfully probe the panel and adjust the
> backlight on my board.
>
> Fixes: bfd451403d70 ("drm/panel-simple: Support DP AUX backlight")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
>
>  drivers/gpu/drm/panel/panel-simple.c | 3 +++
>  1 file changed, 3 insertions(+)

Pushed with Lyude's review to drm-misc-next:

5ead9b5b1575 drm/panel-simple: Power the panel when probing DP AUX backlight