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Message-ID: <ecbbe366-b7c7-885d-f574-0ac900d7599a@linaro.org>
Date:   Thu, 7 Jul 2022 23:51:01 +0300
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Subject: Re: [PATCH v4] drm/msm/dp: make eDP panel as the first connected
 connector
Content-Language: en-GB
To:     Kuogee Hsieh <quic_khsieh@quicinc.com>, robdclark@gmail.com,
        sean@poorly.run, swboyd@chromium.org, dianders@chromium.org,
        vkoul@kernel.org, daniel@ffwll.ch, airlied@linux.ie,
        agross@kernel.org, bjorn.andersson@linaro.org
Cc:     quic_abhinavk@quicinc.com, quic_aravindh@quicinc.com,
        quic_sbillaka@quicinc.com, freedreno@lists.freedesktop.org,
        dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <1657135928-31195-1-git-send-email-quic_khsieh@quicinc.com>
From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
In-Reply-To: <1657135928-31195-1-git-send-email-quic_khsieh@quicinc.com>
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Precedence: bulk

On 06/07/2022 22:32, 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>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

> ---
>   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;
>   


-- 
With best wishes
Dmitry