These patches allow PCIe AER to function in a kernel without
CONFIG_PCIEASPM enabled. 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 v2 of the patchset, which includes these changes from v1:
* Rebased from the mainline kernel (4.19-rc7) to Bjorn Helgaas's
pci/aspm branch [1]
* Factored moving the pcie_ports_disabled check to the top of
negotiate_os_control into its own patch
* Simplified new __osc_check_support function and renamed it to
__osc_have_support
* No longer messes with _OSC general availability test and related
error message (i.e. _OSC failed ... disabling ASPM)
[1] https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
Aaron Sierra (2):
PCI/ACPI: Move _OSC test for native services to top
PCI/ACPI: Improve _OSC control request granularity
drivers/acpi/pci_root.c | 129 ++++++++++++++++++++++++++++++++++--------------
1 file changed, 91 insertions(+), 38 deletions(-)
--
2.7.4
