linux-kernel - Re: [PATCH v2 4/4] drm/panel-edp: Choose correct preferred mode

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Message-ID: <CAD=FV=XEnk1TuWsJB6W5PGisg3_0A3HZMGpxEUrtcDxXK=Z+Eg@mail.gmail.com>
Date:   Fri, 3 Nov 2023 09:02:55 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     Neil Armstrong <neil.armstrong@...aro.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        Sam Ravnborg <sam@...nborg.org>,
        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>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] drm/panel-edp: Choose correct preferred mode

Hi,

On Thu, Nov 2, 2023 at 3:13 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
> If a non generic edp-panel is under aux-bus, the mode read from edid would
> still be selected as preferred and results in multiple preferred modes,
> which is ambiguous.
>
> If a hard-coded mode is present, unset the preferred bit of the modes read
> from edid.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> ---
> v1->v2: split patches from drm_modes.
> ---
>  drivers/gpu/drm/panel/panel-edp.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)

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

Do you think this should have a "Fixes?" As per discussion on V1 [1],
this has probably been a bit broken from the beginning, though I guess
it only became a big deal after the AUX bus made it so that the panel
driver commonly had the EDID...

[1] https://lore.kernel.org/r/CAD=FV=WHzCdiYumsxUm_am+ALqq9SOOrjf=JYHqJuiKFB+Dnsw@mail.gmail.com