linux-kernel - Re: [RFC PATCH 04/10] drm/panel_helper: Introduce drm_panel

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Message-ID: <CAD=FV=UZOxT58=jx4=iAyjXGnON_qROy4puosT0WfB5yy+2Ndw@mail.gmail.com>
Date:   Tue, 5 Sep 2023 12:12:58 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Maxime Ripard <mripard@...nel.org>
Cc:     dri-devel@...ts.freedesktop.org,
        Linus Walleij <linus.walleij@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 04/10] drm/panel_helper: Introduce drm_panel_helper

Hi,

On Tue, Sep 5, 2023 at 9:45 AM Doug Anderson <dianders@...omium.org> wrote:
>
> As per our discussion, in V2 we will make drm_panel_remove() actually
> unprepare / disable a panel if it was left enabled. This would
> essentially fold in the drm_panel_helper_shutdown() from my RFC patch.
> This would make tdo_tl070wsh30_panel_remove() behave the same as it
> did before. Ugh, though I may have to think about this more when I get
> to implementation since I don't think there's a guarantee of the
> ordering of shutdown calls between the DRM driver and the panel.
> Anyway, something to discuss later.

Ugh, ignore the above paragraph. I managed to confuse myself and was
thinking about shutdown but talking about remove. Sigh. :( Instead,
pretend the above paragraph said:

As per our discussion, in V2 we will make drm_panel_remove() actually
unprepare / disable a panel (and print a warning) if it was left
enabled. This would essentially fold in the
drm_panel_helper_shutdown() from my RFC patch (but add a warning).
This would make tdo_tl070wsh30_panel_remove() behave the same as it
did before with the addition of a warning if someone tries to remove a
currently powered panel.

-Doug