diff options
Diffstat (limited to 'drivers/usb/host/ehci-pci.c')
| -rw-r--r-- | drivers/usb/host/ehci-pci.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index c46a58f9181..36864f95844 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -66,6 +66,8 @@ static int ehci_pci_setup(struct usb_hcd *hcd) { struct ehci_hcd *ehci = hcd_to_ehci(hcd); struct pci_dev *pdev = to_pci_dev(hcd->self.controller); + struct pci_dev *p_smbus; + u8 rev; u32 temp; int retval; @@ -166,6 +168,28 @@ static int ehci_pci_setup(struct usb_hcd *hcd) pci_write_config_byte(pdev, 0x4b, tmp | 0x20); } break; + case PCI_VENDOR_ID_ATI: + /* SB600 and old version of SB700 have a bug in EHCI controller, + * which causes usb devices lose response in some cases. + */ + if ((pdev->device == 0x4386) || (pdev->device == 0x4396)) { + p_smbus = pci_get_device(PCI_VENDOR_ID_ATI, + PCI_DEVICE_ID_ATI_SBX00_SMBUS, + NULL); + if (!p_smbus) + break; + rev = p_smbus->revision; + if ((pdev->device == 0x4386) || (rev == 0x3a) + || (rev == 0x3b)) { + u8 tmp; + ehci_info(ehci, "applying AMD SB600/SB700 USB " + "freeze workaround\n"); + pci_read_config_byte(pdev, 0x53, &tmp); + pci_write_config_byte(pdev, 0x53, tmp | (1<<3)); + } + pci_dev_put(p_smbus); + } + break; } ehci_reset(ehci); |