BACK_PORCH 375 drivers/gpu/drm/zte/zx_vou.c val |= BACK_PORCH(vm.hback_porch - 1); BACK_PORCH 380 drivers/gpu/drm/zte/zx_vou.c val |= BACK_PORCH(vm.vback_porch - 1); BACK_PORCH 398 drivers/gpu/drm/zte/zx_vou.c val |= BACK_PORCH(vm.vback_porch);