PLL_REF_INPUT_DREFCLK  258 drivers/gpu/drm/gma500/psb_intel_reg.h #define PLL_REF_INPUT_DREFCLK		(0 << 13)
PLL_REF_INPUT_DREFCLK 3325 drivers/gpu/drm/i915/i915_reg.h #define   PLL_REF_INPUT_DREFCLK		(0 << 13)