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path: root/drivers/usb/host
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-rw-r--r--drivers/usb/host/ehci-pci.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 3ba01664f82..72ccd56e36d 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);