[media] media: blackfin: bfin_capture: set v4l2 buffer sequence

this patch adds support to set the v4l2 buffer sequence.
Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Tested-by: Scott Jiang <scott.jiang.linux@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/blackfin/bfin_capture.c

@@ -103,6 +103,8 @@ struct bcap_device {
 	struct completion comp;
 	/* prepare to stop */
 	bool stop;
+	/* vb2 buffer sequence counter */
+	unsigned sequence;
 };
 
 static const struct bcap_format bcap_formats[] = {
@@ -333,6 +335,8 @@ static int bcap_start_streaming(struct vb2_queue *vq, unsigned int count)
 		goto err;
 	}
 
+	bcap_dev->sequence = 0;
+
 	reinit_completion(&bcap_dev->comp);
 	bcap_dev->stop = false;
 
@@ -411,6 +415,7 @@ static irqreturn_t bcap_isr(int irq, void *dev_id)
 			vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 			ppi->err = false;
 		} else {
+			vb->v4l2_buf.sequence = bcap_dev->sequence++;
 			vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
 		}
 		bcap_dev->cur_frm = list_entry(bcap_dev->dma_queue.next,