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PCI: disable ASPM on pre-1.1 PCIe devices

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Disable ASPM on pre-1.1 PCIe devices, as many of them don't implement it
correctly.

Tested-by: Jack Howarth <howarth@bromo.msbb.uc.edu>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Shaohua Li
2008-07-23 10:32:31 +08:00
committed by Jesse Barnes
parent 5fde244d39
commit 149e16372a
3 changed files with 16 additions and 1 deletions
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13
drivers/pci/pcie/aspm.c
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@@ -510,6 +510,7 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)
{
struct pci_dev *child_dev;
int child_pos;
u32 reg32;
/*
* Some functions in a slot might not all be PCIE functions, very
@@ -519,6 +520,18 @@ static int pcie_aspm_sanity_check(struct pci_dev *pdev)
child_pos = pci_find_capability(child_dev, PCI_CAP_ID_EXP);
if (!child_pos)
return -EINVAL;
/*
* Disable ASPM for pre-1.1 PCIe device, we follow MS to use
* RBER bit to determine if a function is 1.1 version device
*/
pci_read_config_dword(child_dev, child_pos + PCI_EXP_DEVCAP,
&reg32);
if (!(reg32 & PCI_EXP_DEVCAP_RBER)) {
printk("Pre-1.1 PCIe device detected, "
"disable ASPM for %s\n", pci_name(pdev));
return -EINVAL;
}
}
return 0;
}