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

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Message-ID: <60252405-81f2-2465-bc20-5f91a9072031@quicinc.com>
Date:   Fri, 8 Jul 2022 09:00:51 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Doug Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>
CC:     Rob Clark <robdclark@...il.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



On 7/8/2022 8:25 AM, Doug Anderson 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.

Right, from what I saw on IRC, panel_bridge is the way forward and 
dmitry did push a change to do that

https://patchwork.freedesktop.org/patch/492585/

But I think we can go ahead with this change because its simple enough.

Regarding the panel_bridge migration, I am going to start reviewing that 
as well.

> 
> 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?