MIN_VSYNC_PLUS_BP  444 drivers/gpu/drm/drm_modes.c 		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
MIN_VSYNC_PLUS_BP  452 drivers/gpu/drm/drm_modes.c 	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;