diff options
| -rw-r--r-- | payloads/libpayload/drivers/usb/usbinit.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/payloads/libpayload/drivers/usb/usbinit.c b/payloads/libpayload/drivers/usb/usbinit.c index 6fb7d4b117..4225c3f153 100644 --- a/payloads/libpayload/drivers/usb/usbinit.c +++ b/payloads/libpayload/drivers/usb/usbinit.c @@ -146,9 +146,13 @@ static void usb_scan_pci_bus(int bus) header_type = pci_read_config8(pci_device, REG_HEADER_TYPE); /* If this is a bridge, scan the other side. */ if ((header_type & ~HEADER_TYPE_MULTIFUNCTION) == - HEADER_TYPE_BRIDGE) - usb_scan_pci_bus(pci_read_config8(pci_device, - REG_SECONDARY_BUS)); + HEADER_TYPE_BRIDGE) { + /* Verify that the bridge is enabled */ + if ((pci_read_config16(pci_device, REG_COMMAND) + & 3) != 0) + usb_scan_pci_bus(pci_read_config8( + pci_device, REG_SECONDARY_BUS)); + } else usb_controller_initialize(bus, dev, func); } |