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

[Abhinav Kumar <quic_abhinavk@quicinc.com>]

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@quicinc.com>
Fixes: c8afe684c95c ("drm/msm: basic KMS driver for snapdragon")
> ---
>   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;
>