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 11:47:43 -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 7/6/2022 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")
> ---
>   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;
>