[PATCH v2] drm/mediatek: make eDP panel as the first connected connector

[Sean Paul]

On Thu, Nov 10, 2022 at 1:49 PM Gil Dekel <gildekel at chromium.org> wrote:
>
> [Why]
> Some userspaces assume that the first connected connector is the "main"
> display, which supposed to display, for example, the login screen.
> For laptops, this should be the internal connector.
>
> [How]
> This patch calls drm_helper_move_panel_connectors_to_head() right before
> crtc creation to ensure internal connectors are at the top of the
> connector list.
>
> Tested by ensuring the internal panels are at the top of the connector
> list via modetest -c.
>
> This patch does to mediatek what the following patch
> https://www.spinics.net/lists/stable/msg590605.html
> did for qualcomm.
>

Reviewed-by: Sean Paul <seanpaul at chromium.org>

> Signed-off-by: Gil Dekel <gildekel at chromium.org>
> Tested-by: Gil Dekel <gildekel at chromium.org>
> ---
> v2: Fix copy-paste errors in commit message so it's relevant for this
>     patch and the mediatek driver.
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 91f58db5915f..76daaf6a0945 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -386,6 +386,12 @@ static int mtk_drm_kms_init(struct drm_device *drm)
>         if (ret)
>                 goto put_mutex_dev;
>
> +       /*
> +        * Ensure internal panels are at the top of the connector list before
> +        * crtc creation.
> +        */
> +       drm_helper_move_panel_connectors_to_head(drm);
> +
>         /*
>          * We currently support two fixed data streams, each optional,
>          * and each statically assigned to a crtc:
> --
> Gil Dekel, Software Engineer, Google / ChromeOS Display and Graphics