linux-kernel - Re: [PATCH] drm/msm/dsi: Set panel orientation when directly connected

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Date:   Wed, 17 Aug 2022 13:48:25 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>, patches@...ts.linux.dev,
        Sean Paul <sean@...rly.run>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: Re: [PATCH] drm/msm/dsi: Set panel orientation when directly connected

Hi,

On Wed, Jul 20, 2022 at 3:42 PM Doug Anderson <dianders@...omium.org> wrote:
>
> Hi,
>
> On Wed, Jul 20, 2022 at 1:46 PM Rob Clark <robdclark@...il.com> wrote:
> >
> > On Fri, Jul 8, 2022 at 8:25 AM Doug Anderson <dianders@...omium.org> wrote:
> > >
> > > Hi,
> > >
> > > On Wed, Jul 6, 2022 at 12:14 PM Stephen Boyd <swboyd@...omium.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@...omium.org>
> > > > Cc: Douglas Anderson <dianders@...omium.org>
> > > > Signed-off-by: Stephen Boyd <swboyd@...omium.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@...omium.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@...il.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/

Just checking up. What's the latest thinking here? Do we want to land
Stephen's change as a stopgap?
drm_connector_set_orientation_from_panel() is available in v6.0-rc1.

-Doug