[media] uvcvideo: Add UVC timestamps support

UVC devices transmit a device timestamp along with video frames. Convert
the timestamp to a host timestamp and use it to fill the V4L2 buffer
timestamp field.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c
index 268be579aa72..518f77d3a4d8 100644
--- a/drivers/media/video/uvc/uvc_queue.c
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -104,10 +104,22 @@ static void uvc_buffer_queue(struct vb2_buffer *vb)
         spin_unlock_irqrestore(&queue->irqlock, flags);
 }
 
+static int uvc_buffer_finish(struct vb2_buffer *vb)
+{
+        struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
+        struct uvc_streaming *stream =
+                        container_of(queue, struct uvc_streaming, queue);
+        struct uvc_buffer *buf = container_of(vb, struct uvc_buffer, buf);
+
+        uvc_video_clock_update(stream, &vb->v4l2_buf, buf);
+        return 0;
+}
+
 static struct vb2_ops uvc_queue_qops = {
         .queue_setup = uvc_queue_setup,
         .buf_prepare = uvc_buffer_prepare,
         .buf_queue = uvc_buffer_queue,
+        .buf_finish = uvc_buffer_finish,
 };
 
 void uvc_queue_init(struct uvc_video_queue *queue, enum v4l2_buf_type type,