GET_DISTANCE_TO_VBLANKSTART  575 drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h #define GET_DISTANCE_TO_VBLANKSTART	(1 << 31)
GET_DISTANCE_TO_VBLANKSTART  692 drivers/gpu/drm/radeon/radeon_mode.h #define GET_DISTANCE_TO_VBLANKSTART	(1 << 31)