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| author | Shaohua Li <shaohua.li@intel.com> | 2008-07-23 10:32:31 +0800 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2008-07-28 14:56:57 -0700 |
| commit | 149e16372a2066c5474d8a8db9b252afd57eb427 (patch) | |
| tree | 075a46f0672739fdab18d2f1e5f06080160de8b0 /drivers/pci/pcie | |
| parent | 5fde244d39b88625ac578d83e6625138714de031 (diff) | |
| download | linux-149e16372a2066c5474d8a8db9b252afd57eb427.tar.gz linux-149e16372a2066c5474d8a8db9b252afd57eb427.tar.bz2 linux-149e16372a2066c5474d8a8db9b252afd57eb427.zip | |
PCI: disable ASPM on pre-1.1 PCIe devices
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>
Diffstat (limited to 'drivers/pci/pcie')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 759c51a4e399..704605298c5e 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -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, + ®32); + 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; } |