CVT_MIN_V_BPORCH  152 drivers/gpu/drm/drm_modes.c #define	CVT_MIN_V_BPORCH		6
CVT_MIN_V_BPORCH  426 drivers/media/v4l2-core/v4l2-dv-timings.c #define CVT_MIN_V_BPORCH	7	/* lines */