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path: root/drivers/usb/host/ehci-pci.c
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Diffstat (limited to 'drivers/usb/host/ehci-pci.c')
-rw-r--r--drivers/usb/host/ehci-pci.c24
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);