1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 3ba01664f821..72ccd56e36dd 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -152,6 +152,20 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
                         break;
                 }
                 break;
+        case PCI_VENDOR_ID_VIA:
+                if (pdev->device == 0x3104 && (pdev->revision & 0xf0) == 0x60) {
+                        u8 tmp;
+
+                        /* The VT6212 defaults to a 1 usec EHCI sleep time which
+                         * hogs the PCI bus *badly*. Setting bit 5 of 0x4B makes
+                         * that sleep time use the conventional 10 usec.
+                         */
+                        pci_read_config_byte(pdev, 0x4b, &tmp);
+                        if (tmp & 0x20)
+                                break;
+                        pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
+                }
+                break;
         }
 
         ehci_reset(ehci);