These patches allow PCIe AER to function in a kernel without
CONFIG_PCIEASPM enabled or with ASPM disabled at run time via
pcie_aspm=off. There is no explicit Kbuild dependency between the two
and there are, in my opinion, legitimate reasons for no implicit
dependency to exist either.
Previously with ASPM:
acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
acpi PNP0A03:00: _OSC: OS now controls [PME AER PCIeCapability LTR]
Previously without ASPM:
acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig Segments MSI]
acpi PNP0A03:00: _OSC: not requesting OS control; OS requires [ExtendedConfig ASPM ClockPM MSI]
Now with ASPM:
acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
acpi PNP0A03:00: _OSC: OS requested [PME AER PCIeCapability LTR]
acpi PNP0A03:00: _OSC: platform granted [PME AER PCIeCapability LTR]
Now without ASPM:
acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig Segments MSI]
acpi PNP0A03:00: _OSC: OS requested [AER PCIeCapability]
acpi PNP0A03:00: _OSC: platform granted [AER PCIeCapability]
This is v4 of the patchset, which includes these changes from v3:
* Factored non-functional output change into own patch (0001)
* Factored non-functional introduction of inline functions into
own patch (0003)
Aaron Sierra (3):
PCI/ACPI: Homogenize _OSC negotiation output
PCI/ACPI: Allow _OSC request without ASPM support
PCI/ACPI: Refactor _OSC request bit setting
drivers/acpi/pci_root.c | 109 +++++++++++++++++++++++++++++-----------
1 file changed, 80 insertions(+), 29 deletions(-)
--
2.17.1
