PANEL_POWER_DOWN_DELAY_MASK  194 drivers/gpu/drm/gma500/psb_intel_reg.h #define PANEL_POWER_DOWN_DELAY_MASK	(0x1fff0000)
PANEL_POWER_DOWN_DELAY_MASK 4768 drivers/gpu/drm/i915/i915_reg.h #define  PANEL_POWER_DOWN_DELAY_MASK	REG_GENMASK(28, 16)