V4L/DVB: ivtv: Timing tweaks and code re-order to try and improve stability

Added small delay on device open & close to allow hardware to settle. Move yuv
register restore to before the decoder firmware call to stop playback.

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

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

@@ -823,6 +823,12 @@ static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 
 	IVTV_DEBUG_FILE("close() of %s\n", s->name);
 
+	if (id->type == IVTV_DEC_STREAM_TYPE_YUV &&
+		test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
+		/* Restore registers we've changed & clean up any mess */
+		ivtv_yuv_close(itv);
+	}
+
 	/* Stop decoding */
 	if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
 		IVTV_DEBUG_INFO("close stopping decode\n");
@@ -832,10 +838,7 @@ static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
 	}
 	clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
 	clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
-	if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
-		/* Restore registers we've changed & clean up any mess we've made */
-		ivtv_yuv_close(itv);
-	}
+
 	if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
 		itv->output_mode = OUT_NONE;
 

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

@@ -670,6 +670,10 @@ static int ivtv_setup_v4l2_decode_stream(struct ivtv_stream *s)
 			width, height, p->audio_properties)) {
 		IVTV_DEBUG_WARN("Couldn't initialize decoder source\n");
 	}
+
+	/* Decoder sometimes dies here, so wait a moment */
+	ivtv_msleep_timeout(10, 0);
+
 	return 0;
 }
 
@@ -709,6 +713,9 @@ int ivtv_start_v4l2_decode_stream(struct ivtv_stream *s, int gop_offset)
 	/* start playback */
 	ivtv_vapi(itv, CX2341X_DEC_START_PLAYBACK, 2, gop_offset, 0);
 
+	/* Let things settle before we actually start */
+	ivtv_msleep_timeout(10, 0);
+
 	/* Clear the following Interrupt mask bits for decoding */
 	ivtv_clear_irq_mask(itv, IVTV_IRQ_MASK_DECODE);
 	IVTV_DEBUG_IRQ("IRQ Mask is now: 0x%08x\n", itv->irqmask);