diff options
Diffstat (limited to 'drivers/pci/probe.c')
| -rw-r--r-- | drivers/pci/probe.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index e3cf8a2..e02cdaa 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -740,6 +740,17 @@ struct pci_bus *pci_add_new_bus(struct pci_bus *parent, struct pci_dev *dev, } EXPORT_SYMBOL(pci_add_new_bus); +static void pci_enable_crs(struct pci_dev *pdev) +{ + u16 root_cap = 0; + + /* Enable CRS Software Visibility if supported */ + pcie_capability_read_word(pdev, PCI_EXP_RTCAP, &root_cap); + if (root_cap & PCI_EXP_RTCAP_CRSVIS) + pcie_capability_set_word(pdev, PCI_EXP_RTCTL, + PCI_EXP_RTCTL_CRSSVE); +} + /* * If it's a bridge, configure it and scan the bus behind it. * For CardBus bridges, we don't scan behind as the devices will @@ -787,6 +798,8 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass) pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT); + pci_enable_crs(dev); + if ((secondary || subordinate) && !pcibios_assign_all_busses() && !is_cardbus && !broken) { unsigned int cmax; @@ -1292,8 +1305,13 @@ bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l, *l == 0x0000ffff || *l == 0xffff0000) return false; - /* Configuration request Retry Status */ - while (*l == 0xffff0001) { + /* + * Configuration Request Retry Status. Some root ports return the + * actual device ID instead of the synthetic ID (0xFFFF) required + * by the PCIe spec. Ignore the device ID and only check for + * (vendor id == 1). + */ + while ((*l & 0xffff) == 0x0001) { if (!crs_timeout) return false; |