drm_atomic_helper_crtc_duplicate_state
EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc);
.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc);