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media: subdev: add v4l2_subdev_routing_validate() helper

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Add a v4l2_subdev_routing_validate() helper for verifying routing for
common cases like only allowing non-overlapping 1-to-1 streams.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Laurent Pinchart
2021-12-21 11:23:58 +01:00
committed by Mauro Carvalho Chehab
parent 5b0d85b379
commit 69c0fe7ae7
2 changed files with 141 additions and 0 deletions
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39
include/media/v4l2-subdev.h
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@@ -1584,6 +1584,45 @@ struct v4l2_mbus_framefmt *
v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
u32 pad, u32 stream);
/**
* enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions
*
* @V4L2_SUBDEV_ROUTING_NO_1_TO_N:
* an input stream may not be routed to multiple output streams (stream
* duplication)
* @V4L2_SUBDEV_ROUTING_NO_N_TO_1:
* multiple input streams may not be routed to the same output stream
* (stream merging)
* @V4L2_SUBDEV_ROUTING_NO_STREAM_MIX:
* streams on the same pad may not be routed to streams on different pads
* @V4L2_SUBDEV_ROUTING_ONLY_1_TO_1:
* only non-overlapping 1-to-1 stream routing is allowed (a combination of
* @V4L2_SUBDEV_ROUTING_NO_1_TO_N and @V4L2_SUBDEV_ROUTING_NO_N_TO_1)
*/
enum v4l2_subdev_routing_restriction {
V4L2_SUBDEV_ROUTING_NO_1_TO_N = BIT(0),
V4L2_SUBDEV_ROUTING_NO_N_TO_1 = BIT(1),
V4L2_SUBDEV_ROUTING_NO_STREAM_MIX = BIT(2),
V4L2_SUBDEV_ROUTING_ONLY_1_TO_1 =
V4L2_SUBDEV_ROUTING_NO_1_TO_N |
V4L2_SUBDEV_ROUTING_NO_N_TO_1,
};
/**
* v4l2_subdev_routing_validate() - Verify that routes comply with driver
* constraints
* @sd: The subdevice
* @routing: Routing to verify
* @disallow: Restrictions on routes
*
* This verifies that the given routing complies with the @disallow constraints.
*
* Returns 0 on success, error value otherwise.
*/
int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
const struct v4l2_subdev_krouting *routing,
enum v4l2_subdev_routing_restriction disallow);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */