From 4257f7e008ea394fcecc050f1569c3503b8bcc15 Mon Sep 17 00:00:00 2001 From: Vidya Sagar Date: Sun, 25 Oct 2020 00:34:42 +0530 Subject: PCI/ASPM: Save/restore L1SS Capability for suspend/resume Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't saved and restored during suspend/resume leading to L1 Substates configuration being lost post-resume. Save the L1 Substates control registers so that the configuration is retained post-resume. Link: https://lore.kernel.org/r/20201024190442.871-1-vidyas@nvidia.com Signed-off-by: Vidya Sagar Signed-off-by: Bjorn Helgaas --- drivers/pci/pci.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'drivers/pci/pci.c') diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e578d34095e9..eb52c28c3a1a 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1564,6 +1564,7 @@ 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); return pci_save_vc_state(dev); @@ -1669,6 +1670,7 @@ 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); @@ -3332,6 +3334,11 @@ 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); } -- cgit v1.2.3