USE_REAL_VBLANKSTART 853 drivers/gpu/drm/amd/amdgpu/amdgpu_display.c if (!(flags & USE_REAL_VBLANKSTART)) USE_REAL_VBLANKSTART 1950 drivers/gpu/drm/radeon/radeon_display.c if (!(flags & USE_REAL_VBLANKSTART)) USE_REAL_VBLANKSTART 1775 drivers/gpu/drm/radeon/radeon_pm.c USE_REAL_VBLANKSTART,