On 05/10/2021 10:57, Tomi Valkeinen wrote:
> Add a v4l2_subdev_has_route() helper function which can be used for
> media_entity_operations.has_route op.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-subdev.c | 31 +++++++++++++++++++++++++++
> include/media/v4l2-subdev.h | 16 ++++++++++++++
> 2 files changed, 47 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index b4e1f8772d96..14b8282fe45b 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -998,6 +998,37 @@ int v4l2_subdev_link_validate(struct media_link *link)
> }
> EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);
>
> +bool v4l2_subdev_has_route(struct media_entity *entity, unsigned int pad0,
> + unsigned int pad1)
> +{
> + struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
> + struct v4l2_subdev_krouting *routing;
> + unsigned int i;
> + struct v4l2_subdev_state *state;
> +
> + state = v4l2_subdev_lock_active_state(sd);
> +
> + routing = &state->routing;
> +
> + for (i = 0; i < routing->num_routes; ++i) {
> + struct v4l2_subdev_route *route = &routing->routes[i];
> +
> + if (!(route->flags & V4L2_SUBDEV_ROUTE_FL_ACTIVE))
> + continue;
> +
> + if ((route->sink_pad == pad0 && route->source_pad == pad1) ||
> + (route->source_pad == pad0 && route->sink_pad == pad1)) {
> + v4l2_subdev_unlock_state(state);
> + return true;
> + }
> + }
> +
> + v4l2_subdev_unlock_state(state);
> +
> + return false;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_subdev_has_route);
> +
> struct v4l2_subdev_state *
> __v4l2_subdev_state_alloc(struct v4l2_subdev *sd, const char *lock_name,
> struct lock_class_key *lock_key)
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index f318670a49c8..8b2cf3190276 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -1226,6 +1226,22 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd,
> */
> int v4l2_subdev_link_validate(struct media_link *link);
>
> +/**
> + * v4l2_subdev_has_route - MC has_route implementation for subdevs
> + *
> + * @entity: pointer to &struct media_entity
> + * @pad0: pad number for the first pad
> + * @pad1: pad number for the second pad
> + *
> + * This function looks at the routing in subdev's active state and returns if
> + * there is a route connecting pad0 and pad1.
> + *
> + * This function can be used as implementation for
> + * media_entity_operations.has_route.
> + */
> +bool v4l2_subdev_has_route(struct media_entity *entity, unsigned int pad0,
> + unsigned int pad1);
> +
> /**
> * __v4l2_subdev_state_alloc - allocate v4l2_subdev_state
> *
>
