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[media] v4l2-dv-timings: fix rounding in hblank and hsync calculation
Changed the rounding calculation for hblank and hsync to match it to equations in cvt and gtf standards. In cvt calculation, hsync needs to be rounded down. In gtf calculations, hblank needs to be rounded to nearest multiple of twice the cell granularity and hsync needs to be rounded to the nearest multiple of cell granularity. 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>
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@ -436,8 +436,8 @@ bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
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h_bp = h_blank / 2;
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frame_width = image_width + h_blank;
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hsync = (frame_width * 8 + 50) / 100;
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hsync = hsync - hsync % CVT_CELL_GRAN;
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hsync = frame_width * 8 / 100;
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hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
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h_fp = h_blank - hsync - h_bp;
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}
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@ -552,14 +552,15 @@ bool v4l2_detect_gtf(unsigned frame_height,
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(hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) / 2) /
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(hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000);
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h_blank = h_blank - h_blank % (2 * GTF_CELL_GRAN);
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h_blank = ((h_blank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN)) *
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(2 * GTF_CELL_GRAN);
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frame_width = image_width + h_blank;
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pix_clk = (image_width + h_blank) * hfreq;
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pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
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hsync = (frame_width * 8 + 50) / 100;
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hsync = hsync - hsync % GTF_CELL_GRAN;
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hsync = ((hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN) * GTF_CELL_GRAN;
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h_fp = h_blank / 2 - hsync;
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