FRONT_PORCH_SHIFT  104 drivers/gpu/drm/zte/zx_vou_regs.h #define FRONT_PORCH_MASK		(0x7ff << FRONT_PORCH_SHIFT)
FRONT_PORCH_SHIFT  148 drivers/gpu/drm/zte/zx_vou_regs.h #define FRONT_PORCH(x)	(((x) << FRONT_PORCH_SHIFT) & FRONT_PORCH_MASK)