V4L/DVB (5918): ivtv: fix TV-out VBI handling, only reset on last close.

While decoding (MPEG or YUV) is active or when VBI output is in use, then
do not clear the VBI output of the saa7127. Only after the last user is
gone can we clear it.

This fixes the case where playback was stopped, another channel was chosen
and playback was restarted, while /dev/vbi16 was used to set the WSS
(widescreen) setting. Without this fix the WSS was reset on every stop
instead of just keeping the last value.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

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

@@ -800,7 +800,16 @@ int ivtv_v4l2_close(struct inode *inode, struct file *filp)
 		ivtv_unmute(itv);
 		ivtv_release_stream(s);
 	} else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
+		struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
+
 		ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
+
+		/* If all output streams are closed, and if the user doesn't have
+		   IVTV_DEC_STREAM_TYPE_VOUT open, then disable VBI on TV-out. */
+		if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
+			/* disable VBI on TV-out */
+			ivtv_disable_vbi(itv);
+		}
 	} else {
 		ivtv_stop_capture(id, 0);
 	}

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

@@ -603,10 +603,6 @@ static int ivtv_setup_v4l2_decode_stream(struct ivtv_stream *s)
 
 	IVTV_DEBUG_INFO("Setting some initial decoder settings\n");
 
-	/* disable VBI signals, if the MPEG stream contains VBI data,
-	   then that data will be processed automatically for you. */
-	ivtv_disable_vbi(itv);
-
 	/* set audio mode to left/stereo  for dual/stereo mode. */
 	ivtv_vapi(itv, CX2341X_DEC_SET_AUDIO_MODE, 2, itv->audio_bilingual_mode, itv->audio_stereo_mode);
 
@@ -639,7 +635,7 @@ static int ivtv_setup_v4l2_decode_stream(struct ivtv_stream *s)
 	}
 	if (ivtv_vapi(itv, CX2341X_DEC_SET_DECODER_SOURCE, 4, datatype,
 			itv->params.width, itv->params.height, itv->params.audio_properties)) {
-		IVTV_DEBUG_WARN("COULDN'T INITIALIZE DECODER SOURCE\n");
+		IVTV_DEBUG_WARN("Couldn't initialize decoder source\n");
 	}
 	return 0;
 }
@@ -909,11 +905,6 @@ 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);
 
-	if (!test_bit(IVTV_F_S_PASSTHROUGH, &s->s_flags)) {
-		/* disable VBI on TV-out */
-		ivtv_disable_vbi(itv);
-	}
-
 	/* decrement decoding */
 	atomic_dec(&itv->decoding);