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Old 03-30-2012, 10:13 AM
Colin King
Default PCI: Allow pcie_aspm=force to work even when FADT indicates it is unsupported

From: Colin Ian King <colin.king@canonical.com>

BugLink: https://bugs.launchpad.net/ubuntu/+bug/962038

Right now using pcie_aspm=force will not enable ASPM if the FADT indicates
ASPM is unsupported. However, the semantics of force should probably allow
for this, especially as they did before the ASPM disable rework with commit

This patch just skips the clearing of any ASPM setup that the firmware has
carried out on this bus if pcie_aspm=force is being used.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
drivers/pci/pcie/aspm.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 2275162..c73ed00 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -790,6 +790,9 @@ 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

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