diff options
Diffstat (limited to 'drivers/media/video/cx18/cx18-streams.c')
| -rw-r--r-- | drivers/media/video/cx18/cx18-streams.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/media/video/cx18/cx18-streams.c b/drivers/media/video/cx18/cx18-streams.c index a8dcc0f171d..778aa0c0f9b 100644 --- a/drivers/media/video/cx18/cx18-streams.c +++ b/drivers/media/video/cx18/cx18-streams.c @@ -360,9 +360,16 @@ static void cx18_vbi_setup(struct cx18_stream *s) if (raw) { lines = cx->vbi.count * 2; } else { - lines = cx->is_60hz ? 24 : 38; - if (cx->is_60hz) - lines += 2; + /* + * For 525/60 systems, according to the VIP 2 & BT.656 std: + * The EAV RP code's Field bit toggles on line 4, a few lines + * after the Vertcal Blank bit has already toggled. + * Tell the encoder to capture 21-4+1=18 lines per field, + * since we want lines 10 through 21. + * + * FIXME - revisit for 625/50 systems + */ + lines = cx->is_60hz ? (21 - 4 + 1) * 2 : 38; } data[0] = s->handle; @@ -402,9 +409,13 @@ static void cx18_vbi_setup(struct cx18_stream *s) * * Since the V bit is only allowed to toggle in the EAV RP code, * just before the first active region line, these two - * are problematic and we have to ignore them: + * are problematic: * 0x90 (Task HorizontalBlank) * 0xd0 (Task EvenField HorizontalBlank) + * + * We have set the digitzer to consider the first active line + * as part of VerticalBlank as well so we don't have to look for + * these problem codes nor lose the last line of sliced data. */ data[4] = 0xB0F0B0F0; /* |