Re: [PATCH v3 7/7] drm/mediatek: mtk_dsi: Create connector for bridges

[Chun-Kuang Hu]

Hi, Enric:

Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx> æ 2020å4æ17æ éä äå11:06åéï
>
> Use the drm_bridge_connector helper to create a connector for pipelines
> that use drm_bridge. This allows splitting connector operations across
> multiple bridges when necessary, instead of having the last bridge in
> the chain creating the connector and handling all connector operations
> internally.
>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@xxxxxxxxxxxxx>
> ---
>
> Changes in v3:
> - Move the bridge.type line to the patch that adds drm_bridge support. (Laurent Pinchart)
>
> Changes in v2: None
>
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index 157097c63b23..85f76b01ae4d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -17,6 +17,7 @@
>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
>  #include <drm/drm_mipi_dsi.h>
>  #include <drm/drm_of.h>
>  #include <drm/drm_panel.h>
> @@ -183,6 +184,7 @@ struct mtk_dsi {
>         struct drm_encoder encoder;
>         struct drm_bridge bridge;
>         struct drm_bridge *next_bridge;
> +       struct drm_connector *connector;
>         struct phy *phy;
>
>         void __iomem *regs;
> @@ -977,10 +979,19 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
>          */
>         dsi->encoder.possible_crtcs = 1;
>
> -       ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL, 0);
> +       ret = drm_bridge_attach(&dsi->encoder, &dsi->bridge, NULL,
> +                               DRM_BRIDGE_ATTACH_NO_CONNECTOR);
>         if (ret)
>                 goto err_cleanup_encoder;
>
> +       dsi->connector = drm_bridge_connector_init(drm, &dsi->encoder);
> +       if (IS_ERR(dsi->connector)) {
> +               DRM_ERROR("Unable to create bridge connector\n");
> +               ret = PTR_ERR(dsi->connector);
> +               goto err_cleanup_encoder;
> +       }
> +       drm_connector_attach_encoder(dsi->connector, &dsi->encoder);
> +

I'm not very clear about how brige-connector works, but why connector
does not attach to panel?

Regards,
Chun-Kuang.

>         return 0;
>
>  err_cleanup_encoder:
> --
> 2.25.1
>