CFG_H_BACK_PORCH  256 drivers/video/fbdev/mmp/hw/mmp_ctrl.h #define	 CFG_H_BACK_PORCH(b)			((b)<<16)
CFG_H_BACK_PORCH   83 drivers/video/fbdev/pxa168fb.h #define     CFG_H_BACK_PORCH(b)			((b) << 16)