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media: v4l2-subdev: Add v4l2_subdev_s_stream_helper() function 

The v4l2_subdev_s_stream_helper() helper can be used by subdevs that
implement the stream-aware .enable_streams() and .disable_streams()
operations to implement .s_stream(). This is limited to subdevs that
have a single source pad.

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 2022-01-18 01:16:14 +01:00 committed by Mauro Carvalho Chehab
parent d0749adb30
commit 34a315ce0e
2 changed files with 57 additions and 0 deletions
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40
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -1967,6 +1967,46 @@ done:
}
EXPORT_SYMBOL_GPL(v4l2_subdev_disable_streams);
int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable)
{
struct v4l2_subdev_state *state;
struct v4l2_subdev_route *route;
struct media_pad *pad;
u64 source_mask = 0;
int pad_index = -1;
/*
* Find the source pad. This helper is meant for subdevs that have a
* single source pad, so failures shouldn't happen, but catch them
* loudly nonetheless as they indicate a driver bug.
*/
media_entity_for_each_pad(&sd->entity, pad) {
if (pad->flags & MEDIA_PAD_FL_SOURCE) {
pad_index = pad->index;
break;
}
}
if (WARN_ON(pad_index == -1))
return -EINVAL;
/*
* As there's a single source pad, just collect all the source streams.
*/
state = v4l2_subdev_lock_and_get_active_state(sd);
for_each_active_route(&state->routing, route)
source_mask |= BIT_ULL(route->source_stream);
v4l2_subdev_unlock_state(state);
if (enable)
return v4l2_subdev_enable_streams(sd, pad_index, source_mask);
else
return v4l2_subdev_disable_streams(sd, pad_index, source_mask);
}
EXPORT_SYMBOL_GPL(v4l2_subdev_s_stream_helper);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */

17
include/media/v4l2-subdev.h
View File

@ -1731,6 +1731,23 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask);
/**
* v4l2_subdev_s_stream_helper() - Helper to implement the subdev s_stream
* operation using enable_streams and disable_streams
* @sd: The subdevice
* @enable: Enable or disable streaming
*
* Subdevice drivers that implement the streams-aware
* &v4l2_subdev_pad_ops.enable_streams and &v4l2_subdev_pad_ops.disable_streams
* operations can use this helper to implement the legacy
* &v4l2_subdev_video_ops.s_stream operation.
*
* This helper can only be used by subdevs that have a single source pad.
*
* Return: 0 on success, or a negative error code otherwise.
*/
int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable);
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
#endif /* CONFIG_MEDIA_CONTROLLER */