linux-kernel - Re: [PATCH v4] drm/msm/dp: make eDP panel as the first connected connector

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Date:   Wed, 20 Jul 2022 12:01:30 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...ux.ie>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <bjorn.andersson@...aro.org>
CC:     <quic_aravindh@...cinc.com>, <quic_sbillaka@...cinc.com>,
        <freedreno@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] drm/msm/dp: make eDP panel as the first connected
 connector



On 7/20/2022 11:47 AM, Abhinav Kumar wrote:
> 
> 
> On 7/6/2022 12:32 PM, Kuogee Hsieh wrote:
>> Some userspace presumes that the first connected connector is the main
>> display, where it's supposed to display e.g. the login screen. For
>> laptops, this should be the main panel.
>>
>> This patch call drm_helper_move_panel_connectors_to_head() after
>> drm_bridge_connector_init() to make sure eDP stay at head of
>> connected connector list. This fixes unexpected corruption happen
>> at eDP panel if eDP is not placed at head of connected connector
>> list.
>>
>> Changes in v2:
>> -- move drm_helper_move_panel_connectors_to_head() to
>>         dpu_kms_drm_obj_init()
>>
>> Changes in v4:
>> -- move drm_helper_move_panel_connectors_to_head() to msm_drm_init()
>>
>> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> Fixes: c8afe684c95c ("drm/msm: basic KMS driver for snapdragon")

Lets drop the previous fixes tag and use this one as its more recent and 
appropriate as it added eDP support for sc7280.

Fixes: ef7837ff091c ("drm/msm/dp: Add DP controllers for sc7280")

>> ---
>>   drivers/gpu/drm/msm/msm_drv.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/msm_drv.c 
>> b/drivers/gpu/drm/msm/msm_drv.c
>> index 4a3dda2..4d518c2 100644
>> --- a/drivers/gpu/drm/msm/msm_drv.c
>> +++ b/drivers/gpu/drm/msm/msm_drv.c
>> @@ -419,6 +419,8 @@ static int msm_drm_init(struct device *dev, const 
>> struct drm_driver *drv)
>>           }
>>       }
>> +    drm_helper_move_panel_connectors_to_head(ddev);
>> +
>>       ddev->mode_config.funcs = &mode_config_funcs;
>>       ddev->mode_config.helper_private = &mode_config_helper_funcs;