On 05/10/2021 10:57, Tomi Valkeinen wrote:
> Add a helper for verifying routing for the common case of
> non-overlapping 1-to-1 streams.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-subdev.c | 24 ++++++++++++++++++++++++
> include/media/v4l2-subdev.h | 14 ++++++++++++++
> 2 files changed, 38 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 22a9bea0fa85..2a64ff003e4b 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -1569,3 +1569,27 @@ int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
> return 0;
> }
> EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt);
> +
> +int v4l2_routing_simple_verify(const struct v4l2_subdev_krouting *routing)
> +{
> + unsigned int i, j;
> +
> + for (i = 0; i < routing->num_routes; ++i) {
> + const struct v4l2_subdev_route *route = &routing->routes[i];
> +
> + for (j = i + 1; j < routing->num_routes; ++j) {
> + const struct v4l2_subdev_route *r = &routing->routes[j];
> +
> + if (route->sink_pad == r->sink_pad &&
> + route->sink_stream == r->sink_stream)
> + return -EINVAL;
> +
> + if (route->source_pad == r->source_pad &&
> + route->source_stream == r->source_stream)
> + return -EINVAL;
> + }
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_routing_simple_verify);
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index 1a4df0aafe8a..5e50f2ded653 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -1565,4 +1565,18 @@ v4l2_state_get_opposite_stream_format(struct v4l2_subdev_state *state, u32 pad,
> int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
> struct v4l2_subdev_format *format);
>
> +/**
> + * v4l2_routing_simple_verify() - Verify that all streams are non-overlapping
> + * 1-to-1 streams
> + * @routing: routing to verify
> + *
> + * This verifies that the given routing contains only non-overlapping 1-to-1
> + * streams. In other words, no two streams have the same source or sink
> + * stream ID on a single pad. This is the most common case of routing
> + * supported by devices.
> + *
> + * Returns 0 on success, error value otherwise.
> + */
> +int v4l2_routing_simple_verify(const struct v4l2_subdev_krouting *routing);
> +
> #endif
>
