[media] media: platform: pxa_camera: add buffer sequencing

Add sequence numbers to completed buffers.
Signed-off-by: NRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/soc_camera/pxa_camera.c

@@ -223,6 +223,7 @@ struct pxa_camera_dev {
 	struct list_head	capture;
 
 	spinlock_t		lock;
+	unsigned int		buf_sequence;
 
 	struct pxa_buffer	*active;
 	struct tasklet_struct	task_eof;
@@ -423,10 +424,13 @@ static void pxa_camera_wakeup(struct pxa_camera_dev *pcdev,
 			      struct pxa_buffer *buf)
 {
 	struct vb2_buffer *vb = &buf->vbuf.vb2_buf;
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 
 	/* _init is used to debug races, see comment in pxa_camera_reqbufs() */
 	list_del_init(&buf->queue);
 	vb->timestamp = ktime_get_ns();
+	vbuf->sequence = pcdev->buf_sequence++;
+	vbuf->field = V4L2_FIELD_NONE;
 	vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
 	dev_dbg(pcdev_to_dev(pcdev), "%s dequeud buffer (buf=0x%p)\n",
 		__func__, buf);
@@ -1022,6 +1026,7 @@ static int pxac_vb2_start_streaming(struct vb2_queue *vq, unsigned int count)
 	dev_dbg(pcdev_to_dev(pcdev), "%s(count=%d) active=%p\n",
 		__func__, count, pcdev->active);
 
+	pcdev->buf_sequence = 0;
 	if (!pcdev->active)
 		pxa_camera_start_capture(pcdev);