UPLL_REFCLK_SRC_SEL_MASK 252 drivers/gpu/drm/radeon/r600.c WREG32_P(CG_UPLL_FUNC_CNTL, UPLL_REFCLK_SRC_SEL_MASK, UPLL_REFCLK_SRC_SEL_MASK 253 drivers/gpu/drm/radeon/r600.c ~UPLL_REFCLK_SRC_SEL_MASK);