Re: [PATCH v10 15/38] media: entity: Add media_entity_has_route() function

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hello Tomi,

Thank you for the patch.

On Tue, Nov 30, 2021 at 04:15:13PM +0200, Tomi Valkeinen wrote:
> From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> This is a wrapper around the media entity has_route operation.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
> Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> ---
>  drivers/media/mc/mc-entity.c | 19 +++++++++++++++++++
>  include/media/media-entity.h | 17 +++++++++++++++++
>  2 files changed, 36 insertions(+)
> 
> diff --git a/drivers/media/mc/mc-entity.c b/drivers/media/mc/mc-entity.c
> index b44ab423b49b..a83f004efd37 100644
> --- a/drivers/media/mc/mc-entity.c
> +++ b/drivers/media/mc/mc-entity.c
> @@ -229,6 +229,25 @@ EXPORT_SYMBOL_GPL(media_entity_pads_init);
>   * Graph traversal
>   */
>  
> +bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
> +			    unsigned int pad1)
> +{
> +	if (pad0 >= entity->num_pads || pad1 >= entity->num_pads)
> +		return false;
> +
> +	if (pad0 == pad1)
> +		return true;
> +
> +	if (!entity->ops || !entity->ops->has_route)
> +		return true;
> +
> +	if (entity->pads[pad1].index < entity->pads[pad0].index)
> +		swap(pad0, pad1);
> +
> +	return entity->ops->has_route(entity, pad0, pad1);
> +}
> +EXPORT_SYMBOL_GPL(media_entity_has_route);

As this function is only used in mc-entity.c, can we avoid exposing it
for now ? It's a new API, and I'd rather be notified if drivers start
using it directly by requiring a patch to expose the function at that
point.

> +
>  static struct media_pad *
>  media_pad_other(struct media_pad *pad, struct media_link *link)
>  {
> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> index ad4020b2df65..b3069eef7fdb 100644
> --- a/include/media/media-entity.h
> +++ b/include/media/media-entity.h
> @@ -904,6 +904,23 @@ int media_entity_get_fwnode_pad(struct media_entity *entity,
>  __must_check int media_graph_walk_init(
>  	struct media_graph *graph, struct media_device *mdev);
>  
> +/**
> + * media_entity_has_route - Check if two entity pads are connected internally
> + *
> + * @entity: The entity
> + * @pad0: The first pad index
> + * @pad1: The second pad index
> + *
> + * This function can be used to check whether two pads of an entity are
> + * connected internally in the entity.
> + *
> + * The caller must hold entity->graph_obj.mdev->mutex.
> + *
> + * Return: true if the pads are connected internally and false otherwise.
> + */
> +bool media_entity_has_route(struct media_entity *entity, unsigned int pad0,
> +			    unsigned int pad1);
> +
>  /**
>   * media_graph_walk_cleanup - Release resources used by graph walk.
>   *

-- 
Regards,

Laurent Pinchart