V4L/DVB (8648): ivtv: improve CC support

- change the work-queue to a single threaded high prio workqueue
- use DMA instead of PIO for the sliced VBI data.
- remove some incorrect tests
- increase the internal VBI capture queue size for sliced VBI packets
- ignore duplicate VBI lines

With these changes it should finally be possible to get reliable closed
captions.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/media/video/ivtv/ivtv-vbi.c b/drivers/media/video/ivtv/ivtv-vbi.c
index 71798f0da27f..1ce9deb1104f 100644
--- a/drivers/media/video/ivtv/ivtv-vbi.c
+++ b/drivers/media/video/ivtv/ivtv-vbi.c
@@ -293,6 +293,7 @@ static u32 compress_sliced_buf(struct ivtv *itv, u32 line, u8 *buf, u32 size, u8
         u32 line_size = itv->vbi.sliced_decoder_line_size;
         struct v4l2_decode_vbi_line vbi;
         int i;
+        unsigned lines = 0;
 
         /* find the first valid line */
         for (i = 0; i < size; i++, buf++) {
@@ -313,7 +314,8 @@ static u32 compress_sliced_buf(struct ivtv *itv, u32 line, u8 *buf, u32 size, u8
                 }
                 vbi.p = p + 4;
                 itv->video_dec_func(itv, VIDIOC_INT_DECODE_VBI_LINE, &vbi);
-                if (vbi.type) {
+                if (vbi.type && !(lines & (1 << vbi.line))) {
+                        lines |= 1 << vbi.line;
                         itv->vbi.sliced_data[line].id = vbi.type;
                         itv->vbi.sliced_data[line].field = vbi.is_second_field;
                         itv->vbi.sliced_data[line].line = vbi.line;