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| author | Andy Walls <awalls@radix.net> | 2009-02-28 18:13:50 -0500 |
|---|---|---|
| committer | Andy Walls <awalls@radix.net> | 2009-02-28 18:13:50 -0500 |
| commit | 597bd5dbc2ff24bbdd148fb698bc9a3d9daad61c (patch) | |
| tree | 0ddc76bc87085b265e99bac8e3df5dd0f1a637df /linux/drivers/media/video/cx18/cx18-av-core.c | |
| parent | 6f74c341a7b249eb9d00d02c979b5b646f6838f3 (diff) | |
| download | mediapointer-dvb-s2-597bd5dbc2ff24bbdd148fb698bc9a3d9daad61c.tar.gz mediapointer-dvb-s2-597bd5dbc2ff24bbdd148fb698bc9a3d9daad61c.tar.bz2 | |
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>
Diffstat (limited to 'linux/drivers/media/video/cx18/cx18-av-core.c')
| -rw-r--r-- | linux/drivers/media/video/cx18/cx18-av-core.c | 26 |
1 files changed, 16 insertions, 10 deletions
diff --git a/linux/drivers/media/video/cx18/cx18-av-core.c b/linux/drivers/media/video/cx18/cx18-av-core.c index aeeb3cfa3..21f4be839 100644 --- a/linux/drivers/media/video/cx18/cx18-av-core.c +++ b/linux/drivers/media/video/cx18/cx18-av-core.c @@ -292,23 +292,29 @@ void cx18_av_std_setup(struct cx18 *cx) * * vsync: always 6 half-lines of vsync pulses * vactive: half lines of active video - * vblank656: half lines, after line 3, of blanked video - * vblank: half lines, after line 9, of blanked video + * vblank656: half lines, after line 3/mid-266, of blanked video + * vblank: half lines, after line 9/272, of blanked video * + * As far as I can tell: * vblank656 starts counting from the falling edge of the first - * vsync pulse (start of line 4) + * vsync pulse (start of line 4 or mid-266) * vblank starts counting from the after the 6 vsync pulses and - * 6 equalization pulses (start of line 10) + * 6 or 5 equalization pulses (start of line 10 or 272) * * For 525 line systems the driver will extract VBI information - * from lines 10 through 21. To avoid the EAV RP code from - * toggling at the start of hblank at line 22, where sliced VBI - * data from line 21 is stuffed, also treat line 22 as blanked. + * from lines 10-21 and lines 273-284. */ - vblank656 = 38; /* lines 4 through 22 */ - vblank = 26; /* lines 10 through 22 */ - vactive = 481; /* lines 23 through 262.5 */ + vblank656 = 38; /* lines 4 - 22 & 266 - 284 */ + vblank = 26; /* lines 10 - 22 & 272 - 284 */ + vactive = 481; /* lines 23 - 263 & 285 - 525 */ + /* + * For a 13.5 Mpps clock and 15,734.26 Hz line rate, a line is + * is 858 pixels = 720 active + 138 blanking. The Hsync leading + * edge should happen 1.2 us * 13.5 Mpps ~= 16 pixels after the + * end of active video, leaving 122 pixels of hblank to ignore + * before active video starts. + */ hactive = 720; hblank = 122; luma_lpf = 1; |