commit fd96c2b26339f21a66504cb3f36579bb312a8f3b
Author: Rene Herman <rene.herman@gmail.com>
Date:   Tue Mar 18 00:02:16 2008 +0100

    USB: VIA VT6212(L) 10us EHCI sleep time select.
    
    The VIA VT6212(L) uses a 1us EHCI sleep time by default which hogs
    the bus bad. Use the 10us EHCI spec value instead as suggested by
    Lev A. Melnikovsky.
    
    CC: Lev A. Melnikovsky <melnikovsky@mail.ru>
    Signed-off-by: Rene Herman <rene.herman@gmail.com>

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 3ba0166..bdc8af9 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 1us EHCI sleep time which
+			 * hogs the bus badly. Setting bit 5 of 0x4B sets the
+			 * sleep time to the EHCI standard 10us.
+			 */
+			pci_read_config_byte(pdev, 0x4b, &tmp);
+			if (tmp & 0x20)
+				break;
+			pci_write_config_byte(pdev, 0x4b, tmp | 0x20);
+		}
+		break;
 	}
 
 	ehci_reset(ehci);