X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=drivers%2Fusb%2Fhost%2Fehci-pci.c;h=36864f9584445a41cf8bea70155c50b76f888cc2;hb=0a99e8ac430a27825bd055719765fd0d65cd797f;hp=c46a58f9181ded00f97627f076277fd32db9ff79;hpb=916941b2bfd9c4a8b66855f198ae16c3f51ef570;p=linux-2.6-omap-h63xx.git

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);