linux-kernel - Re: [PATCH v3] drm/msm/dp: make eDP panel as the first connected connector

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Date:   Wed, 6 Jul 2022 10:38:46 -0700
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        <robdclark@...il.com>, <sean@...rly.run>, <swboyd@...omium.org>,
        <dianders@...omium.org>, <vkoul@...nel.org>, <daniel@...ll.ch>,
        <airlied@...ux.ie>, <agross@...nel.org>,
        <bjorn.andersson@...aro.org>
CC:     <quic_abhinavk@...cinc.com>, <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 v3] drm/msm/dp: make eDP panel as the first connected
 connector


On 7/6/2022 10:25 AM, Dmitry Baryshkov wrote:
> On 06/07/2022 20:24, 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()
>>
>> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
>> ---
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c 
>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> index 2b9d931..50ff666 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
>> @@ -763,6 +763,8 @@ static int _dpu_kms_drm_obj_init(struct dpu_kms 
>> *dpu_kms)
>>       if (ret)
>>           return ret;
>>   +    drm_helper_move_panel_connectors_to_head(dev);
>
> This should be in msm_drv.c unless you have a strong reason to have it 
> here.
Can you please  provide more info why should be in msm_drv.c?
> _dpu_kms_drm_obj_init() create and initialize drm obj one by one and 
> _dpu_kms_setup_displays() had created system wide connectors/interfaces .

After that should be fine to move edp to head of connector list.

>> +
>>       num_encoders = 0;
>>       drm_for_each_encoder(encoder, dev)
>>           num_encoders++;
>
>