return NULL;
 }
 
-static struct dm_atomic_state *
-dm_atomic_get_old_state(struct drm_atomic_state *state)
-{
-       struct drm_device *dev = state->dev;
-       struct amdgpu_device *adev = dev->dev_private;
-       struct amdgpu_display_manager *dm = &adev->dm;
-       struct drm_private_obj *obj;
-       struct drm_private_state *old_obj_state;
-       int i;
-
-       for_each_old_private_obj_in_state(state, obj, old_obj_state, i) {
-               if (obj->funcs == dm->atomic_obj.funcs)
-                       return to_dm_atomic_state(old_obj_state);
-       }
-
-       return NULL;
-}
-
 static struct drm_private_state *
 dm_atomic_duplicate_state(struct drm_private_obj *obj)
 {