diff options
| author | Vidya Sagar <vidyas@nvidia.com> | 2022-09-13 18:48:22 +0530 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2022-10-04 20:35:40 -0500 |
| commit | 4ff116d0d5fd8a025604b0802d93a2d5f4e465d1 (patch) | |
| tree | a9578e55a122e03ebec0354dd08f88a5d1abdf3c /drivers/pci/pci.c | |
| parent | 5e85eba6f50dc288c22083a7e213152bcc4b8208 (diff) | |
PCI/ASPM: Save L1 PM Substates Capability for suspend/resume
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>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 95bc329e74c0..68a49fbaabde 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1663,6 +1663,7 @@ int pci_save_state(struct pci_dev *dev) return i; pci_save_ltr_state(dev); + pci_save_aspm_l1ss_state(dev); pci_save_dpc_state(dev); pci_save_aer_state(dev); pci_save_ptm_state(dev); @@ -1769,6 +1770,7 @@ void pci_restore_state(struct pci_dev *dev) * LTR itself (in the PCIe capability). */ pci_restore_ltr_state(dev); + pci_restore_aspm_l1ss_state(dev); pci_restore_pcie_state(dev); pci_restore_pasid_state(dev); @@ -3485,6 +3487,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) if (error) pci_err(dev, "unable to allocate suspend buffer for LTR\n"); + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, + 2 * sizeof(u32)); + if (error) + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); + pci_allocate_vc_save_buffers(dev); } |