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[media] v4l2-dv-timings: replace hsync magic number with a macro

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This change will not change timing calculation. In CVT generator
spreadsheet the nominal value of hsync (as a percentage of line)
is 8 percent.

Cc: Martin Bugge <marbugge@cisco.com>
Signed-off-by: Prashant Laddha <prladdha@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Prashant Laddha 2015-04-22 14:32:37 -03:00 committed by Mauro Carvalho Chehab
parent 947ed99e5d
commit 9c3f205252
1 changed files with 2 additions and 1 deletions
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3
drivers/media/v4l2-core/v4l2-dv-timings.c
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@ -313,6 +313,7 @@ EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
#define CVT_MIN_V_BPORCH 7 /* lines */
#define CVT_MIN_V_PORCH_RND 3 /* lines */
#define CVT_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
#define CVT_HSYNC_PERCENT 8 /* nominal hsync as percentage of line */
/* Normal blanking for CVT uses GTF to calculate horizontal blanking */
#define CVT_CELL_GRAN 8 /* character cell granularity */
@ -442,7 +443,7 @@ bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
h_bp = h_blank / 2;
frame_width = image_width + h_blank;
hsync = frame_width * 8 / 100;
hsync = frame_width * CVT_HSYNC_PERCENT / 100;
hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
h_fp = h_blank - hsync - h_bp;
}