intel_fbc_cfb_size
fbc_state->cfb_size = intel_fbc_cfb_size(plane_state);
intel_fbc_cfb_size(plane_state) <= fbc->limit *
if (intel_fbc_cfb_size(old_plane_state) !=
intel_fbc_cfb_size(new_plane_state))
if (intel_fbc_alloc_cfb(fbc, intel_fbc_cfb_size(plane_state),