drm_atomic_helper_suspend
adev->dm.cached_state = drm_atomic_helper_suspend(adev_to_drm(adev));
EXPORT_SYMBOL(drm_atomic_helper_suspend);
state = drm_atomic_helper_suspend(dev);
state = drm_atomic_helper_suspend(display->drm);
struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev);