linux-kernel - Re: [PATCH] drm/panel: Fix panel mode type setting logic

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Message-ID: <CAD=FV=X7K2KQoRCsr17kj-DWiPs7h_zfcYxK_cdBVnC0wR1NwA@mail.gmail.com>
Date:   Tue, 14 Mar 2023 10:12:02 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Jianhua Lu <lujianhua000@...il.com>
Cc:     Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/panel: Fix panel mode type setting logic

Hi,

On Tue, Mar 14, 2023 at 4:45 AM Jianhua Lu <lujianhua000@...il.com> wrote:
>
> Some panels set mode type to DRM_MODE_TYPE_PREFERRED by the number
> of modes. It isn't reasonable, so set the first mode type to
> DRM_MODE_TYPE_PREFERRED. This should be more reasonable.
>
> Signed-off-by: Jianhua Lu <lujianhua000@...il.com>
> ---
>  drivers/gpu/drm/panel/panel-abt-y030xx067a.c     | 2 +-
>  drivers/gpu/drm/panel/panel-auo-a030jtn01.c      | 2 +-
>  drivers/gpu/drm/panel/panel-edp.c                | 4 ++--
>  drivers/gpu/drm/panel/panel-innolux-ej030na.c    | 2 +-
>  drivers/gpu/drm/panel/panel-newvision-nv3051d.c  | 2 +-
>  drivers/gpu/drm/panel/panel-newvision-nv3052c.c  | 2 +-
>  drivers/gpu/drm/panel/panel-novatek-nt35950.c    | 2 +-
>  drivers/gpu/drm/panel/panel-novatek-nt39016.c    | 2 +-
>  drivers/gpu/drm/panel/panel-orisetech-ota5601a.c | 2 +-
>  drivers/gpu/drm/panel/panel-seiko-43wvf1g.c      | 4 ++--
>  drivers/gpu/drm/panel/panel-simple.c             | 4 ++--
>  11 files changed, 14 insertions(+), 14 deletions(-)

Can you explain more about your motivation here? At least for
panel-edp and panel-simple it seems like it would be better to leave
the logic alone and manually add DRM_MODE_TYPE_PREFERRED to the right
mode for the rare panel that actually has more than one mode listed.
That feels more explicit to me.

-Doug