DP_CLOCK_OUTPUT_ENABLE 1418 drivers/gpu/drm/gma500/psb_intel_reg.h #define   DP_CLOCK_OUTPUT_ENABLE	(1 << 13)
DP_CLOCK_OUTPUT_ENABLE 5472 drivers/gpu/drm/i915/i915_reg.h #define   DP_CLOCK_OUTPUT_ENABLE	(1 << 13)