[PATCH 0/3] PCI/ASPM: Fix L1SS issues

[Bjorn Helgaas]

From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>

This is really late, but I think we have two significant issues with L1SS:

  1) pcie_aspm_cap_init() reads from the L1SS capability even when it
  doesn't exist, so it reads PCI_COMMAND and PCI_STATUS instead and treats
  those as an L1SS Capability value.

  2) encode_l12_threshold() encodes LTR_L1.2_THRESHOLD as smaller than
  requested, so ports may enter L1.2 when they should not.

These patches are intended to fix both issues.

Bjorn Helgaas (3):
  PCI/ASPM: Factor out L1 PM Substates configuration
  PCI/ASPM: Ignore L1 PM Substates if device lacks capability
  PCI/ASPM: Correct LTR_L1.2_THRESHOLD computation

 drivers/pci/pcie/aspm.c | 155 +++++++++++++++++++++++-----------------
 1 file changed, 90 insertions(+), 65 deletions(-)

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2.25.1