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| author | Matthew Garrett | 2015-04-07 20:07:00 +0200 |
|---|---|---|
| committer | Bjorn Helgaas | 2015-04-09 21:20:11 +0200 |
| commit | 387d37577fdd05e9472c20885464c2a53b3c945f (patch) | |
| tree | 5658630a603c2fa28fe5dc54502a0ac4c3bebe43 /drivers/pci | |
| parent | PCI: Clarify policy for vendor IDs in pci.txt (diff) | |
| download | kernel-qcow2-linux-387d37577fdd05e9472c20885464c2a53b3c945f.tar.gz kernel-qcow2-linux-387d37577fdd05e9472c20885464c2a53b3c945f.tar.xz kernel-qcow2-linux-387d37577fdd05e9472c20885464c2a53b3c945f.zip | |
PCI: Don't clear ASPM bits when the FADT declares it's unsupported
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 18 |
1 files changed, 0 insertions, 18 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 820740a22e94..7d4fcdc512aa 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -782,24 +782,6 @@ void pci_disable_link_state(struct pci_dev *pdev, int state) } EXPORT_SYMBOL(pci_disable_link_state); -void pcie_clear_aspm(struct pci_bus *bus) -{ - struct pci_dev *child; - - if (aspm_force) - return; - - /* - * Clear any ASPM setup that the firmware has carried out on this bus - */ - list_for_each_entry(child, &bus->devices, bus_list) { - __pci_disable_link_state(child, PCIE_LINK_STATE_L0S | - PCIE_LINK_STATE_L1 | - PCIE_LINK_STATE_CLKPM, - false, true); - } -} - static int pcie_aspm_set_policy(const char *val, struct kernel_param *kp) { int i; |