Commit c4a73f31 authored by Laurent Pinchart's avatar Laurent Pinchart Committed by Mauro Carvalho Chehab
Browse files

media: v4l2-subdev: Add v4l2_subdev_state_xlate_streams() helper 



Add a helper function to translate streams between two pads of a subdev,
using the subdev's internal routing table.

Signed-off-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@kernel.org>
parent 69c0fe7a

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

+26 −0
Original line number Diff line number Diff line
@@ -1615,6 +1615,32 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state, 
}

EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format);



u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,

				    u32 pad0, u32 pad1, u64 *streams)

{

	const struct v4l2_subdev_krouting *routing = &state->routing;

	struct v4l2_subdev_route *route;

	u64 streams0 = 0;

	u64 streams1 = 0;



	for_each_active_route(routing, route) {

		if (route->sink_pad == pad0 && route->source_pad == pad1 &&

		    (*streams & BIT_ULL(route->sink_stream))) {

			streams0 |= BIT_ULL(route->sink_stream);

			streams1 |= BIT_ULL(route->source_stream);

		}

		if (route->source_pad == pad0 && route->sink_pad == pad1 &&

		    (*streams & BIT_ULL(route->source_stream))) {

			streams0 |= BIT_ULL(route->source_stream);

			streams1 |= BIT_ULL(route->sink_stream);

		}

	}



	*streams = streams0;

	return streams1;

}

EXPORT_SYMBOL_GPL(v4l2_subdev_state_xlate_streams);



int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,

				 const struct v4l2_subdev_krouting *routing,

				 enum v4l2_subdev_routing_restriction disallow)

include/media/v4l2-subdev.h

+23 −0
Original line number Diff line number Diff line
@@ -1584,6 +1584,29 @@ struct v4l2_mbus_framefmt * 
v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,

					     u32 pad, u32 stream);



/**

 * v4l2_subdev_state_xlate_streams() - Translate streams from one pad to another

 *

 * @state: Subdevice state

 * @pad0: The first pad

 * @pad1: The second pad

 * @streams: Streams bitmask on the first pad

 *

 * Streams on sink pads of a subdev are routed to source pads as expressed in

 * the subdev state routing table. Stream numbers don't necessarily match on

 * the sink and source side of a route. This function translates stream numbers

 * on @pad0, expressed as a bitmask in @streams, to the corresponding streams

 * on @pad1 using the routing table from the @state. It returns the stream mask

 * on @pad1, and updates @streams with the streams that have been found in the

 * routing table.

 *

 * @pad0 and @pad1 must be a sink and a source, in any order.

 *

 * Return: The bitmask of streams of @pad1 that are routed to @streams on @pad0.

 */

u64 v4l2_subdev_state_xlate_streams(const struct v4l2_subdev_state *state,

				    u32 pad0, u32 pad1, u64 *streams);



/**

 * enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions

 *