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

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Date:   Thu, 7 Jul 2022 14:25:07 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Stephen Boyd <swboyd@...omium.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark <robdclark@...il.com>
CC:     Douglas Anderson <dianders@...omium.org>,
        Sean Paul <sean@...rly.run>, <linux-kernel@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <patches@...ts.linux.dev>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        <freedreno@...ts.freedesktop.org>
Subject: Re: [Freedreno] [PATCH] drm/msm/dsi: Set panel orientation when
 directly connected



On 7/7/2022 2:21 PM, Stephen Boyd wrote:
> Quoting Abhinav Kumar (2022-07-07 14:11:08)
>>
>>
>> On 7/6/2022 12:14 PM, Stephen Boyd 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(+)
>>>
>>> diff --git a/drivers/gpu/drm/msm/dsi/dsi_manager.c b/drivers/gpu/drm/msm/dsi/dsi_manager.c
>>> index cb84d185d73a..9333f7095acd 100644
>>> --- a/drivers/gpu/drm/msm/dsi/dsi_manager.c
>>> +++ b/drivers/gpu/drm/msm/dsi/dsi_manager.c
>>> @@ -268,6 +268,8 @@ static int msm_dsi_manager_panel_init(struct drm_connector *conn, u8 id)
>>>                return PTR_ERR(panel);
>>>        }
>>>
>>> +     drm_connector_set_orientation_from_panel(conn, panel);
>>> +
>>
>> This should be moved below the !panel check since you are passing panel
>> as one of the params.
> 
> drm_connector_set_orientation_from_panel() checks for a NULL panel
> pointer and sets to UNKNOWN. If I moved this below the !panel check then
> I'd have to split that condition for !IS_BONDED_DSI() which was more
> diff.
> 

Ah okay. Even if the panel is null, it sets it to 
DRM_MODE_PANEL_ORIENTATION_UNKNOWN.

>>
>> I looked up the doc and it says that for unknown(default cases) this is
>> a no-op so I think this change is fine otherwise.
>>
>> "It is allowed to call this function with a panel_orientation of
>> DRM_MODE_PANEL_ORIENTATION_UNKNOWN, in which case it is a no-op."
> 
> Ok, so you're fine with this patch?

Yes, I only held back the R-b for the previous comment, now since thats 
clarified.

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
> 
>>
>>
>>>        if (!panel || !IS_BONDED_DSI())
>>>                goto out;
>>>
>>>
>>> base-commit: 15b9ca1641f0c3cd74885280331e9172c62a125e