staging: bcm2835-camera: Set sequence number correctly

Set the sequence number in vb2_v4l2_buffer mainly so the
latest v4l2-ctl reports the frame rate correctly.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c

@@ -388,6 +388,7 @@ static void buffer_cb(struct vchiq_mmal_instance *instance,
 	} else {
 		buf->vb.vb2_buf.timestamp = ktime_get_ns();
 	}
+	buf->vb.sequence = dev->capture.sequence++;
 
 	vb2_set_plane_payload(&buf->vb.vb2_buf, 0, length);
 	if (mmal_flags & MMAL_BUFFER_HEADER_FLAG_KEYFRAME)
@@ -515,6 +516,9 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 	/* enable frame capture */
 	dev->capture.frame_count = 1;
 
+	/* reset sequence number */
+	dev->capture.sequence = 0;
+
 	/* if the preview is not already running, wait for a few frames for AGC
 	 * to settle down.
 	 */

drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.h

@@ -91,6 +91,8 @@ struct bm2835_mmal_dev {
 		s64         vc_start_timestamp;
 		/* Kernel start timestamp for streaming */
 		ktime_t kernel_start_ts;
+		/* Sequence number of last buffer */
+		u32		sequence;
 
 		struct vchiq_mmal_port  *port; /* port being used for capture */
 		/* camera port being used for capture */