V4L/DVB (10442): cx18: Fixes for enforcing when Encoder Raw VBI params can be set

The Encoder will only allow the Raw VBI parameters, along with a number of
other API parameters, to take effect when no analog captures are in
progress.  These parameters must be set before the first analog capture starts,
be it MPEG, VBI, YUV, etc., and cannot be changed until the last one stops.  It
is not obvious to me what capture channel API parameters are shared and which
ones must be set per capture channel, so set them all for every analog
capture channel start up.  This fixes the driver so that VBI capture can be
started up after the MPEG capture is going.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-ioctl.c

@@ -42,13 +42,6 @@
 #include <media/v4l2-chip-ident.h>
 #include <linux/i2c-id.h>
 
-static int cx18_vbi_streaming(struct cx18 *cx)
-{
-	struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
-	return (s_vbi->handle != CX18_INVALID_TASK_HANDLE) &&
-		test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
-}
-
 u16 cx18_service2vbi(int type)
 {
 	switch (type) {
@@ -312,7 +305,11 @@ static int cx18_s_fmt_vbi_cap(struct file *file, void *fh,
 	if (ret)
 		return ret;
 
-	if (!cx18_raw_vbi(cx) && cx18_vbi_streaming(cx))
+	/*
+	 * Changing the Encoder's Raw VBI parameters won't have any effect
+	 * if any analog capture is ongoing
+	 */
+	if (!cx18_raw_vbi(cx) && atomic_read(&cx->ana_capturing) > 0)
 		return -EBUSY;
 
 	/*
@@ -345,8 +342,13 @@ static int cx18_s_fmt_sliced_vbi_cap(struct file *file, void *fh,
 
 	cx18_try_fmt_sliced_vbi_cap(file, fh, fmt);
 
-	if (cx18_raw_vbi(cx) && cx18_vbi_streaming(cx))
+	/*
+	 * Changing the Encoder's Raw VBI parameters won't have any effect
+	 * if any analog capture is ongoing
+	 */
+	if (cx18_raw_vbi(cx) && atomic_read(&cx->ana_capturing) > 0)
 		return -EBUSY;
+
 	/*
 	 * Set the service_lines requested in the digitizer/slicer registers.
 	 * Note, cx18_av_vbi() wipes some "impossible" service lines in the

drivers/media/video/cx18/cx18-streams.c

@@ -349,6 +349,14 @@ static void cx18_vbi_setup(struct cx18_stream *s)
 	/* setup VBI registers */
 	cx18_av_cmd(cx, VIDIOC_S_FMT, &cx->vbi.in);
 
+	/*
+	 * Send the CX18_CPU_SET_RAW_VBI_PARAM API command to setup Encoder Raw
+	 * VBI when the first analog capture channel starts, as once it starts
+	 * (e.g. MPEG), we can't effect any change in the Encoder Raw VBI setup
+	 * (i.e. for the VBI capture channels).  We also send it for each
+	 * analog capture channel anyway just to make sure we get the proper
+	 * behavior
+	 */
 	if (raw) {
 		lines = cx->vbi.count * 2;
 	} else {
@@ -410,8 +418,7 @@ static void cx18_vbi_setup(struct cx18_stream *s)
 	CX18_DEBUG_INFO("Setup VBI h: %d lines %x bpl %d fr %d %x %x\n",
 			data[0], data[1], data[2], data[3], data[4], data[5]);
 
-	if (s->type == CX18_ENC_STREAM_TYPE_VBI)
-		cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data);
+	cx18_api(cx, CX18_CPU_SET_RAW_VBI_PARAM, 6, data);
 }
 
 struct cx18_queue *cx18_stream_put_buf_fw(struct cx18_stream *s,
@@ -460,8 +467,8 @@ int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 	u32 data[MAX_MB_ARGUMENTS];
 	struct cx18 *cx = s->cx;
 	struct cx18_buffer *buf;
-	int ts = 0;
 	int captype = 0;
+	struct cx18_api_func_private priv;
 
 	if (s->video_dev == NULL && s->dvb.enabled == 0)
 		return -EINVAL;
@@ -479,7 +486,6 @@ int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 
 	case CX18_ENC_STREAM_TYPE_TS:
 		captype = CAPTURE_CHANNEL_TYPE_TS;
-		ts = 1;
 		break;
 	case CX18_ENC_STREAM_TYPE_YUV:
 		captype = CAPTURE_CHANNEL_TYPE_YUV;
@@ -488,8 +494,16 @@ int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 		captype = CAPTURE_CHANNEL_TYPE_PCM;
 		break;
 	case CX18_ENC_STREAM_TYPE_VBI:
+#ifdef CX18_ENCODER_PARSES_SLICED
 		captype = cx18_raw_vbi(cx) ?
 		     CAPTURE_CHANNEL_TYPE_VBI : CAPTURE_CHANNEL_TYPE_SLICED_VBI;
+#else
+		/*
+		 * Currently we set things up so that Sliced VBI from the
+		 * digitizer is handled as Raw VBI by the encoder
+		 */
+		captype = CAPTURE_CHANNEL_TYPE_VBI;
+#endif
 		cx->vbi.frame = 0;
 		cx->vbi.inserted_frame = 0;
 		memset(cx->vbi.sliced_mpeg_size,
@@ -499,10 +513,6 @@ int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 		return -EINVAL;
 	}
 
-	/* mute/unmute video */
-	cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2,
-		  s->handle, !!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags));
-
 	/* Clear Streamoff flags in case left from last capture */
 	clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 
@@ -510,31 +520,62 @@ int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 	s->handle = data[0];
 	cx18_vapi(cx, CX18_CPU_SET_CHANNEL_TYPE, 2, s->handle, captype);
 
-	if (atomic_read(&cx->ana_capturing) == 0 && !ts) {
-		struct cx18_api_func_private priv;
-
-		/* Stuff from Windows, we don't know what it is */
+	/*
+	 * For everything but CAPTURE_CHANNEL_TYPE_TS, play it safe and
+	 * set up all the parameters, as it is not obvious which parameters the
+	 * firmware shares across capture channel types and which it does not.
+	 *
+	 * Some of the cx18_vapi() calls below apply to only certain capture
+	 * channel types.  We're hoping there's no harm in calling most of them
+	 * anyway, as long as the values are all consistent.  Setting some
+	 * shared parameters will have no effect once an analog capture channel
+	 * has started streaming.
+	 */
+	if (captype != CAPTURE_CHANNEL_TYPE_TS) {
 		cx18_vapi(cx, CX18_CPU_SET_VER_CROP_LINE, 2, s->handle, 0);
 		cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 3, 1);
 		cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 8, 0);
 		cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 3, s->handle, 4, 1);
-		cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, s->handle, 12);
 
+		/*
+		 * Audio related reset according to
+		 * Documentation/video4linux/cx2341x/fw-encoder-api.txt
+		 */
+		if (atomic_read(&cx->ana_capturing) == 0)
+			cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2,
+				  s->handle, 12);
+
+		/*
+		 * Number of lines for Field 1 & Field 2 according to
+		 * Documentation/video4linux/cx2341x/fw-encoder-api.txt
+		 * FIXME - currently we set this to 0 & 0 but things seem OK
+		 */
 		cx18_vapi(cx, CX18_CPU_SET_CAPTURE_LINE_NO, 3,
-			       s->handle, cx->digitizer, cx->digitizer);
+			  s->handle, cx->digitizer, cx->digitizer);
 
-		/* Setup VBI */
 		if (cx->v4l2_cap & V4L2_CAP_VBI_CAPTURE)
 			cx18_vbi_setup(s);
 
-		/* assign program index info.
-		   Mask 7: select I/P/B, Num_req: 400 max */
+		/*
+		 * assign program index info.
+		 * Mask 7: select I/P/B, Num_req: 400 max
+		 * FIXME - currently we have this hardcoded as disabled
+		 */
 		cx18_vapi_result(cx, data, CX18_CPU_SET_INDEXTABLE, 1, 0);
 
-		/* Setup API for Stream */
+		/* Call out to the common CX2341x API setup for user controls */
 		priv.cx = cx;
 		priv.s = s;
 		cx2341x_update(&priv, cx18_api_func, NULL, &cx->params);
+
+		/*
+		 * When starting a capture and we're set for radio,
+		 * ensure the video is muted, despite the user control.
+		 */
+		if (!cx->params.video_mute &&
+		    test_bit(CX18_F_I_RADIO_USER, &cx->i_flags))
+			cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
+				  (cx->params.video_mute_yuv << 8) | 1);
 	}
 
 	if (atomic_read(&cx->tot_capturing) == 0) {
@@ -578,7 +619,7 @@ int cx18_start_v4l2_encode_stream(struct cx18_stream *s)
 	}
 
 	/* you're live! sit back and await interrupts :) */
-	if (!ts)
+	if (captype != CAPTURE_CHANNEL_TYPE_TS)
 		atomic_inc(&cx->ana_capturing);
 	atomic_inc(&cx->tot_capturing);
 	return 0;