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From:   Doug Anderson <dianders@chromium.org>
Date:   Wed, 20 Jul 2022 15:42:19 -0700
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Subject: Re: [PATCH] drm/msm/dsi: Set panel orientation when directly connected
To:     Rob Clark <robdclark@gmail.com>
Cc:     Stephen Boyd <swboyd@chromium.org>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>, patches@lists.linux.dev,
        Sean Paul <sean@poorly.run>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        freedreno <freedreno@lists.freedesktop.org>,
        Hsin-Yi Wang <hsinyi@chromium.org>
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Precedence: bulk

Hi,

On Wed, Jul 20, 2022 at 1:46 PM Rob Clark <robdclark@gmail.com> wrote:
>
> On Fri, Jul 8, 2022 at 8:25 AM Doug Anderson <dianders@chromium.org> wrote:
> >
> > Hi,
> >
> > On Wed, Jul 6, 2022 at 12:14 PM Stephen Boyd <swboyd@chromium.org> wrote:
> > >
> > > Set the panel orientation in drm when the panel is directly connected,
> > > i.e. we're not using an external bridge. The external bridge case is
> > > already handled by the panel bridge code, so we only update the path we
> > > take when the panel is directly connected/internal. This silences a
> > > warning splat coming from __drm_mode_object_add() on Wormdingler boards.
> > >
> > > Cc: Hsin-Yi Wang <hsinyi@chromium.org>
> > > Cc: Douglas Anderson <dianders@chromium.org>
> > > Signed-off-by: Stephen Boyd <swboyd@chromium.org>
> > > ---
> > >
> > > This relies on commit 5e41b01a7808 ("drm/panel: Add an API to allow drm
> > > to set orientation from panel") which is in drm-misc
> > >
> > >  drivers/gpu/drm/msm/dsi/dsi_manager.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> >
> > I don't personally have objections to this, but (to my understanding)
> > "the future" is that everyone should use panel_bridge. If we made the
> > move to panel_bridge today then we wouldn't need to do this. In
> > general I think panel_bridge would end up letting us delete a bunch of
> > code...
> >
> > See commit 4e5763f03e10 ("drm/bridge: ti-sn65dsi86: Wrap panel with
> > panel-bridge") for when this was done by ti-sn65dsi86.
> >
> > Then again, I spent a small amount of time looking into this and it's
> > definitely non-trivial. Still likely worthwhile, but not worth
> > blocking a tiny fix like this. It also should be fairly obvious that
> > we should delete this when we switch to panel_bridge.
> >
> > Thus:
> >
> > Reviewed-by: Douglas Anderson <dianders@chromium.org>
> >
> > I'll assume that we'll just snooze this commit until drm-misc-next
> > merges into a tree that msm-next is based on, which will probably be
> > the next -rc1. If desired and Acked I could land this in
> > drm-misc-next, but it's probably not worth it?
>
> if you want to land this patch via drm-misc, which might be the
> easier/faster route, then:
>
> Acked-by: Rob Clark <robdclark@gmail.com>

As per discussion on IRC, I'm not going to apply this to drm-misc-next.

Given where we are in the cycle landing in drm-misc-next means it
won't be in mainline for a couple versions and I suspect that'll cause
merge conflicts with Dmitry's series [1]. ...and, of course, if
Dmitry's series lands then we don't even need ${SUBJECT} patch...

So I think the plan is:

1. Snooze waiting for the next -rc1 since
drm_connector_set_orientation_from_panel() won't be in mainline until
then.

2. If Dmitry's series looks like a long way off, we could land
${SUBJECT} patch in msm-next as a stopgap fix.


[1] https://lore.kernel.org/r/20220711094320.368062-5-dmitry.baryshkov@linaro.org/

-Doug