_genpd_set_performance_state
static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
ret = _genpd_set_performance_state(genpd, state, 0);