PCI: Don't clear ASPM bits when the FADT declares it's unsupported

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Communications with a hardware vendor confirm that the expected behaviour
on systems that set the FADT ASPM disable bit but which still grant full
PCIe control is for the OS to leave any BIOS configuration intact and
refuse to touch the ASPM bits.  This mimics the behaviour of Windows.

Signed-off-by: Matthew Garrett <mjg59@coreos.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

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Matthew Garrett 2015-04-07 11:07:00 -07:00 • committed by Bjorn Helgaas

parent 37a9c502c0

commit 387d37577f

3 changed files with 8 additions and 33 deletions

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19

drivers/acpi/pci_root.c

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18

drivers/pci/pcie/aspm.c

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4

include/linux/pci-aspm.h

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