SDVOC_GANG_MODE   422 drivers/gpu/drm/gma500/psb_intel_reg.h #define SDVOC_GANG_MODE			(1 << 16)
SDVOC_GANG_MODE  4526 drivers/gpu/drm/i915/i915_reg.h #define   SDVOC_GANG_MODE			(1 << 16) /* Port C only */