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

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>

diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c
index 4e09792038ed01484700c368c0d6eabe18048a94..37f0d6f89878dcc1fef79dafaf884528d20b9d77 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-dv-timings.c
+++ b/drivers/media/v4l2-core/v4l2-dv-timings.c
@@ -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;
        }