cx18: Correct comments about vertical and horizontal blanking timings

From: Andy Walls <awalls@radix.net>

This change only affects comments.

Priority: normal

Signed-off-by: Andy Walls <awalls@radix.net>

1 files changed, 12 insertions, 7 deletions

diff --git a/linux/drivers/media/video/cx18/cx18-av-core.h b/linux/drivers/media/video/cx18/cx18-av-core.h
index fd0df4151..2687a2c91 100644
--- a/linux/drivers/media/video/cx18/cx18-av-core.h
+++ b/linux/drivers/media/video/cx18/cx18-av-core.h
@@ -89,16 +89,21 @@ struct cx18_av_state {
 
 	/*
 	 * The VBI slicer starts operating and counting lines, begining at
-	 * slicer line count of 1, at D lines after the deassertion of VRESET
-	 * This staring field line, S, is 6 or 10 for 625 or 525 line systems.
-	 * Sliced ancillary data captured on VBI slicer line M is sent at the
-	 * beginning of the next VBI slicer line, VBI slicer line count N = M+1.
-	 * Thus when the VBI slicer reports a VBI slicer line number with
-	 * ancillary data, the IDID0 byte indicates VBI slicer line N.
-	 * The actual field line that the captured data comes from is
+	 * slicer line count of 1, at D lines after the deassertion of VRESET.
+	 * This staring field line, S, is 6 (& 319) or 10 (& 273) for 625 or 525
+	 * line systems respectively.  Sliced ancillary data captured on VBI
+	 * slicer line M is inserted after the VBI slicer is done with line M,
+	 * when VBI slicer line count is N = M+1.  Thus when the VBI slicer
+	 * reports a VBI slicer line number with ancillary data, the IDID0 byte
+	 * indicates VBI slicer line N.  The actual field line that the captured
+	 * data comes from is
+	 *
 	 * L = M+(S+D-1) = N-1+(S+D-1) = N + (S+D-2).
 	 *
+	 * L is the line in the field, not frame, from which the VBI data came.
+	 * N is the line reported by the slicer in the ancillary data.
 	 * D is the slicer_line_delay value programmed into register 0x47f.
+	 * S is 6 for 625 line systems or 10 for 525 line systems
 	 * (S+D-2) is the slicer_line_offset used to convert slicer reported
 	 * line counts to actual field lines.
 	 */