diff options
author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2021-12-21 13:23:58 +0300 |
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committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2023-01-22 11:42:43 +0300 |
commit | 69c0fe7ae78b9ed696b5a5d8eaae7ca622c6f7ca (patch) | |
tree | 90ea1a3f0c569bf8b0c6932ce25665bc23551ae2 /drivers/media/v4l2-core/v4l2-subdev.c | |
parent | 5b0d85b379747b09d8b4630fdb5c8a8d74122f0f (diff) | |
download | linux-69c0fe7ae78b9ed696b5a5d8eaae7ca622c6f7ca.tar.xz |
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>
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-subdev.c')
-rw-r--r-- | drivers/media/v4l2-core/v4l2-subdev.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c index ebd6ef9fa6c3..d7e157c7e612 100644 --- a/drivers/media/v4l2-core/v4l2-subdev.c +++ b/drivers/media/v4l2-core/v4l2-subdev.c @@ -1615,6 +1615,108 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state, } EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format); +int v4l2_subdev_routing_validate(struct v4l2_subdev *sd, + const struct v4l2_subdev_krouting *routing, + enum v4l2_subdev_routing_restriction disallow) +{ + u32 *remote_pads = NULL; + unsigned int i, j; + int ret = -EINVAL; + + if (disallow & V4L2_SUBDEV_ROUTING_NO_STREAM_MIX) { + remote_pads = kcalloc(sd->entity.num_pads, sizeof(*remote_pads), + GFP_KERNEL); + if (!remote_pads) + return -ENOMEM; + + for (i = 0; i < sd->entity.num_pads; ++i) + remote_pads[i] = U32_MAX; + } + + for (i = 0; i < routing->num_routes; ++i) { + const struct v4l2_subdev_route *route = &routing->routes[i]; + + /* Validate the sink and source pad numbers. */ + if (route->sink_pad >= sd->entity.num_pads || + !(sd->entity.pads[route->sink_pad].flags & MEDIA_PAD_FL_SINK)) { + dev_dbg(sd->dev, "route %u sink (%u) is not a sink pad\n", + i, route->sink_pad); + goto out; + } + + if (route->source_pad >= sd->entity.num_pads || + !(sd->entity.pads[route->source_pad].flags & MEDIA_PAD_FL_SOURCE)) { + dev_dbg(sd->dev, "route %u source (%u) is not a source pad\n", + i, route->source_pad); + goto out; + } + + /* + * V4L2_SUBDEV_ROUTING_NO_STREAM_MIX: Streams on the same pad + * may not be routed to streams on different pads. + */ + if (disallow & V4L2_SUBDEV_ROUTING_NO_STREAM_MIX) { + if (remote_pads[route->sink_pad] != U32_MAX && + remote_pads[route->sink_pad] != route->source_pad) { + dev_dbg(sd->dev, + "route %u attempts to mix %s streams\n", + i, "sink"); + goto out; + } + + if (remote_pads[route->source_pad] != U32_MAX && + remote_pads[route->source_pad] != route->sink_pad) { + dev_dbg(sd->dev, + "route %u attempts to mix %s streams\n", + i, "source"); + goto out; + } + + remote_pads[route->sink_pad] = route->source_pad; + remote_pads[route->source_pad] = route->sink_pad; + } + + for (j = i + 1; j < routing->num_routes; ++j) { + const struct v4l2_subdev_route *r = &routing->routes[j]; + + /* + * V4L2_SUBDEV_ROUTING_NO_1_TO_N: No two routes can + * originate from the same (sink) stream. + */ + if ((disallow & V4L2_SUBDEV_ROUTING_NO_1_TO_N) && + route->sink_pad == r->sink_pad && + route->sink_stream == r->sink_stream) { + dev_dbg(sd->dev, + "routes %u and %u originate from same sink (%u/%u)\n", + i, j, route->sink_pad, + route->sink_stream); + goto out; + } + + /* + * V4L2_SUBDEV_ROUTING_NO_N_TO_1: No two routes can end + * at the same (source) stream. + */ + if ((disallow & V4L2_SUBDEV_ROUTING_NO_N_TO_1) && + route->source_pad == r->source_pad && + route->source_stream == r->source_stream) { + dev_dbg(sd->dev, + "routes %u and %u end at same source (%u/%u)\n", + i, j, route->source_pad, + route->source_stream); + goto out; + } + } + } + + ret = 0; + +out: + kfree(remote_pads); + return ret; +} +EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate); + #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */ #endif /* CONFIG_MEDIA_CONTROLLER */ |