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Previously the L1 PM Substates Control Registers (CTL1 and CTL2) weren't saved and restored during suspend/resume leading to the L1 PM Substates configuration being lost post-resume. Save the L1 PM Substates Control Registers so that the configuration is retained post-resume. [bhelgaas: drop pci_is_pcie() testing; we can rely on pci_configure_ltr() having already done that] Link: https://lore.kernel.org/r/20220913131822.16557-3-vidyas@nvidia.com Signed-off-by: Vidya Sagar <vidyas@nvidia.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>