PCI_L1SS_CAP
l1ss_cap = dw_pcie_readl_dbi(pci, l1ss + PCI_L1SS_CAP);
dw_pcie_writel_dbi(pci, l1ss + PCI_L1SS_CAP, l1ss_cap);
val = dw_pcie_readl_dbi(pci, l1ss + PCI_L1SS_CAP);
dw_pcie_writel_dbi(pci, l1ss + PCI_L1SS_CAP, val);
pci_read_config_dword(parent, parent->l1ss + PCI_L1SS_CAP,
pci_read_config_dword(child, child->l1ss + PCI_L1SS_CAP,