diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/pcie/aspm.c | 13 | ||||
| -rw-r--r-- | drivers/pci/probe.c | 3 |
2 files changed, 15 insertions, 1 deletions
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index 759c51a4e39..704605298c5 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; } diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 20363006583..7098dfb0744 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1057,7 +1057,8 @@ int pci_scan_slot(struct pci_bus *bus, int devfn) } } - if (bus->self) + /* only one slot has pcie device */ + if (bus->self && nr) pcie_aspm_init_link_state(bus->self); return nr; |