ACPI/PCI: PCIe ASPM _OSC support capabilities called when root bridge added

The _OSC capabilities OSC_ACTIVE_STATE_PWR_SUPPORT and
OSC_CLOCK_PWR_CAPABILITY_SUPPORT are set when the root bridge is added
with pci_acpi_osc_support(), so we no longer need to do it in the ASPM
driver.  Also add the function pcie_aspm_enabled, which returns true if
pcie_aspm=off is not on the kernel command-line.

Signed-off-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 96e68e841539..9fe026b1c9d0 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -347,6 +347,9 @@ static int __devinit acpi_pci_root_add(struct acpi_device *device)
         /* Indicate support for various _OSC capabilities. */
         if (pci_ext_cfg_avail(root->bus->self))
                 flags |= OSC_EXT_PCI_CONFIG_SUPPORT;
+        if (pcie_aspm_enabled())
+                flags |= OSC_ACTIVE_STATE_PWR_SUPPORT |
+                        OSC_CLOCK_PWR_CAPABILITY_SUPPORT;
         if (flags != base_flags)
                 pci_acpi_osc_support(device->handle, flags);