Commit 33c0ddbe authored by Tomi Valkeinen's avatar Tomi Valkeinen Committed by Mauro Carvalho Chehab
Browse files

media: subdev: add v4l2_subdev_has_pad_interdep() 



Add a v4l2_subdev_has_pad_interdep() helper function which can be used
for media_entity_operations.has_pad_interdep op.

It considers two pads interdependent if there is an active route between
pad0 and pad1.

Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@kernel.org>
parent 8a546445

drivers/media/v4l2-core/v4l2-subdev.c

+31 −0
Original line number Diff line number Diff line
@@ -1073,6 +1073,37 @@ int v4l2_subdev_link_validate(struct media_link *link) 
}

EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate);



bool v4l2_subdev_has_pad_interdep(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;

	struct v4l2_subdev_state *state;

	unsigned int i;



	state = v4l2_subdev_lock_and_get_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_pad_interdep);



struct v4l2_subdev_state *

__v4l2_subdev_state_alloc(struct v4l2_subdev *sd, const char *lock_name,

			  struct lock_class_key *lock_key)

include/media/v4l2-subdev.h

+18 −0
Original line number Diff line number Diff line
@@ -1246,6 +1246,24 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev *sd, 
 */

int v4l2_subdev_link_validate(struct media_link *link);



/**

 * v4l2_subdev_has_pad_interdep - MC has_pad_interdep 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 is an implementation of the

 * media_entity_operations.has_pad_interdep operation for subdevs that

 * implement the multiplexed streams API (as indicated by the

 * V4L2_SUBDEV_FL_STREAMS subdev flag).

 *

 * It considers two pads interdependent if there is an active route between pad0

 * and pad1.

 */

bool v4l2_subdev_has_pad_interdep(struct media_entity *entity,

				  unsigned int pad0, unsigned int pad1);



/**

 * __v4l2_subdev_state_alloc - allocate v4l2_subdev_state

 *