media: subdev: add v4l2_subdev_routing_validate() helper
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
Mauro Carvalho Chehab
parent
5b0d85b379
commit
69c0fe7ae7
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@ -1615,6 +1615,108 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
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}
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EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format);
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int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
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const struct v4l2_subdev_krouting *routing,
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enum v4l2_subdev_routing_restriction disallow)
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{
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u32 *remote_pads = NULL;
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unsigned int i, j;
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int ret = -EINVAL;
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if (disallow & V4L2_SUBDEV_ROUTING_NO_STREAM_MIX) {
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remote_pads = kcalloc(sd->entity.num_pads, sizeof(*remote_pads),
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GFP_KERNEL);
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if (!remote_pads)
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return -ENOMEM;
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for (i = 0; i < sd->entity.num_pads; ++i)
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remote_pads[i] = U32_MAX;
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}
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for (i = 0; i < routing->num_routes; ++i) {
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const struct v4l2_subdev_route *route = &routing->routes[i];
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/* Validate the sink and source pad numbers. */
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if (route->sink_pad >= sd->entity.num_pads ||
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!(sd->entity.pads[route->sink_pad].flags & MEDIA_PAD_FL_SINK)) {
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dev_dbg(sd->dev, "route %u sink (%u) is not a sink pad\n",
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i, route->sink_pad);
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goto out;
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}
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if (route->source_pad >= sd->entity.num_pads ||
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!(sd->entity.pads[route->source_pad].flags & MEDIA_PAD_FL_SOURCE)) {
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dev_dbg(sd->dev, "route %u source (%u) is not a source pad\n",
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i, route->source_pad);
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goto out;
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}
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/*
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* V4L2_SUBDEV_ROUTING_NO_STREAM_MIX: Streams on the same pad
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* may not be routed to streams on different pads.
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*/
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if (disallow & V4L2_SUBDEV_ROUTING_NO_STREAM_MIX) {
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if (remote_pads[route->sink_pad] != U32_MAX &&
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remote_pads[route->sink_pad] != route->source_pad) {
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dev_dbg(sd->dev,
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"route %u attempts to mix %s streams\n",
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i, "sink");
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goto out;
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}
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if (remote_pads[route->source_pad] != U32_MAX &&
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remote_pads[route->source_pad] != route->sink_pad) {
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dev_dbg(sd->dev,
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"route %u attempts to mix %s streams\n",
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i, "source");
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goto out;
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}
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remote_pads[route->sink_pad] = route->source_pad;
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remote_pads[route->source_pad] = route->sink_pad;
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}
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for (j = i + 1; j < routing->num_routes; ++j) {
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const struct v4l2_subdev_route *r = &routing->routes[j];
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/*
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* V4L2_SUBDEV_ROUTING_NO_1_TO_N: No two routes can
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* originate from the same (sink) stream.
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*/
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if ((disallow & V4L2_SUBDEV_ROUTING_NO_1_TO_N) &&
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route->sink_pad == r->sink_pad &&
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route->sink_stream == r->sink_stream) {
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dev_dbg(sd->dev,
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"routes %u and %u originate from same sink (%u/%u)\n",
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i, j, route->sink_pad,
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route->sink_stream);
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goto out;
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}
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/*
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* V4L2_SUBDEV_ROUTING_NO_N_TO_1: No two routes can end
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* at the same (source) stream.
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*/
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if ((disallow & V4L2_SUBDEV_ROUTING_NO_N_TO_1) &&
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route->source_pad == r->source_pad &&
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route->source_stream == r->source_stream) {
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dev_dbg(sd->dev,
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"routes %u and %u end at same source (%u/%u)\n",
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i, j, route->source_pad,
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route->source_stream);
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goto out;
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}
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}
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}
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ret = 0;
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out:
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kfree(remote_pads);
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return ret;
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}
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EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate);
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#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
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#endif /* CONFIG_MEDIA_CONTROLLER */
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@ -1584,6 +1584,45 @@ struct v4l2_mbus_framefmt *
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v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
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u32 pad, u32 stream);
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/**
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* enum v4l2_subdev_routing_restriction - Subdevice internal routing restrictions
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*
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* @V4L2_SUBDEV_ROUTING_NO_1_TO_N:
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* an input stream may not be routed to multiple output streams (stream
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* duplication)
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* @V4L2_SUBDEV_ROUTING_NO_N_TO_1:
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* multiple input streams may not be routed to the same output stream
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* (stream merging)
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* @V4L2_SUBDEV_ROUTING_NO_STREAM_MIX:
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* streams on the same pad may not be routed to streams on different pads
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* @V4L2_SUBDEV_ROUTING_ONLY_1_TO_1:
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* only non-overlapping 1-to-1 stream routing is allowed (a combination of
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* @V4L2_SUBDEV_ROUTING_NO_1_TO_N and @V4L2_SUBDEV_ROUTING_NO_N_TO_1)
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*/
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enum v4l2_subdev_routing_restriction {
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V4L2_SUBDEV_ROUTING_NO_1_TO_N = BIT(0),
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V4L2_SUBDEV_ROUTING_NO_N_TO_1 = BIT(1),
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V4L2_SUBDEV_ROUTING_NO_STREAM_MIX = BIT(2),
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V4L2_SUBDEV_ROUTING_ONLY_1_TO_1 =
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V4L2_SUBDEV_ROUTING_NO_1_TO_N |
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V4L2_SUBDEV_ROUTING_NO_N_TO_1,
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};
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/**
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* v4l2_subdev_routing_validate() - Verify that routes comply with driver
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* constraints
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* @sd: The subdevice
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* @routing: Routing to verify
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* @disallow: Restrictions on routes
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*
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* This verifies that the given routing complies with the @disallow constraints.
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*
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* Returns 0 on success, error value otherwise.
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*/
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int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
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const struct v4l2_subdev_krouting *routing,
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enum v4l2_subdev_routing_restriction disallow);
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#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
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#endif /* CONFIG_MEDIA_CONTROLLER */
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