[PATCH v2 4/4] drm: rcar-du: Use drm_bridge_connector_init() helper

[Jacopo Mondi]

Hi Laurent,

On Wed, Dec 16, 2020 at 02:50:21AM +0200, Laurent Pinchart wrote:
> Use the drm_bridge_connector_init() helper to create a drm_connector for
> each output, instead of relying on the bridge drivers doing so. Attach
> the bridges with the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag to instruct
> them not to create a connector.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas at ideasonboard.com>
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 25 ++++++++++++++++++-----
>  1 file changed, 20 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> index ba8c6038cd63..10a66091391a 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c
> @@ -11,6 +11,7 @@
>  #include <linux/slab.h>
>
>  #include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_managed.h>
>  #include <drm/drm_modeset_helper_vtables.h>
> @@ -61,6 +62,7 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
>  			 struct device_node *enc_node)
>  {
>  	struct rcar_du_encoder *renc;
> +	struct drm_connector *connector;
>  	struct drm_bridge *bridge;
>  	int ret;
>
> @@ -122,9 +124,22 @@ int rcar_du_encoder_init(struct rcar_du_device *rcdu,
>  	if (ret)
>  		return ret;
>
> -	/*
> -	 * Attach the bridge to the encoder. The bridge will create the
> -	 * connector.
> -	 */
> -	return drm_bridge_attach(&renc->base, bridge, NULL, 0);
> +	/* Attach the bridge to the encoder. */
> +	ret = drm_bridge_attach(&renc->base, bridge, NULL,
> +				DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> +	if (ret) {
> +		dev_err(rcdu->dev, "failed to attach bridge for output %u\n",
> +			output);
> +		return ret;
> +	}
> +
> +	/* Create the connector for the chain of bridges. */
> +	connector = drm_bridge_connector_init(&rcdu->ddev, &renc->base);
> +	if (IS_ERR(connector)) {
> +		dev_err(rcdu->dev,
> +			"failed to created connector for output %u\n", output);
> +		return PTR_ERR(connector);
> +	}
> +
> +	return drm_connector_attach_encoder(connector, &renc->base);

Looks good
Reviewed-by: Jacopo Mondi <jacopo+renesas at jmondi.org>

I'm trying to figure out how deferred probe of a panel directly
connected to the lvds encoder work. I assume there's no risk of
creating the connector before the panel is probed, or this is not an
issue.

>  }
> --
> Regards,
>
> Laurent Pinchart
>