V4L/DVB: ivtv: Add delay to ensure the decoder always restarts with a blank screen

Add a short delay when stopping the decoder, allowing it to settle and
preventing some unexpected interaction with other firmware commands.

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Tested-by: Martin Dauskardt <martin.dauskardt@gmx.de>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/ivtv/ivtv-streams.c

@@ -912,6 +912,9 @@ int ivtv_stop_v4l2_decode_stream(struct ivtv_stream *s, int flags, u64 pts)
 	clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
 	ivtv_flush_queues(s);
 
+	/* decoder needs time to settle */
+	ivtv_msleep_timeout(40, 0);
+
 	/* decrement decoding */
 	atomic_dec(&itv->decoding);