linux-kernel - Re: [PATCH v2] drm/msm/dp: make eDP panel as the first connected connector

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Date:   Wed, 6 Jul 2022 20:12:50 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>
Cc:     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,
        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 v2] drm/msm/dp: make eDP panel as the first connected connector

On Wed, 6 Jul 2022 at 19:12, Kuogee Hsieh <quic_khsieh@...cinc.com> 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>
> Tested-by: Douglas Anderson <dianders@...omium.org>
> Reviewed-by: Douglas Anderson <dianders@...omium.org>
> Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

Technically this patch was neither  Reviewed, nor Tested. Please
refrain from posting wrong tags.

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

-- 
With best wishes
Dmitry