add: px_p->px_pm_flags |= PX_LDN_EXPECTED;
context: px_pre_pwron_check(px_t *px_p){	pcie_pwr_t	*pwr_p;	/* If no PM info, return failure */	if (!PCIE_PMINFO(px_p->px_dip) ||	    !(pwr_p = PCIE_NEXUS_PMINFO(px_p->px_dip)))		return (DDI_FAILURE);	return (pwr_p->pwr_link_lvl == PM_LEVEL_L3 ? DDI_SUCCESS : DDI_FAILURE);}