X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=drivers%2Fusb%2Fhost%2Fehci-pci.c;fp=drivers%2Fusb%2Fhost%2Fehci-pci.c;h=655f3c9f88bfbb6740e0ac5cc377b45c1af8adae;hb=690c12d2c8ca50e55a3f507059c780ecdb8fd83f;hp=a1e8d273103f77b2d237a5f68438b289b51bb92a;hpb=f639011b4020a8230c8d09866f6eaadcb12e8dde;p=mv-sheeva.git

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index a1e8d273103..655f3c9f88b 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -103,6 +103,19 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
 	if (retval)
 		return retval;
 
+	if ((pdev->vendor == PCI_VENDOR_ID_AMD && pdev->device == 0x7808) ||
+	    (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x4396)) {
+		/* EHCI controller on AMD SB700/SB800/Hudson-2/3 platforms may
+		 * read/write memory space which does not belong to it when
+		 * there is NULL pointer with T-bit set to 1 in the frame list
+		 * table. To avoid the issue, the frame list link pointer
+		 * should always contain a valid pointer to a inactive qh.
+		 */
+		ehci->use_dummy_qh = 1;
+		ehci_info(ehci, "applying AMD SB700/SB800/Hudson-2/3 EHCI "
+				"dummy qh workaround\n");
+	}
+
 	/* data structure init */
 	retval = ehci_init(hcd);
 	if (retval)
@@ -148,6 +161,18 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
 			if (pdev->revision < 0xa4)
 				ehci->no_selective_suspend = 1;
 			break;
+
+		/* MCP89 chips on the MacBookAir3,1 give EPROTO when
+		 * fetching device descriptors unless LPM is disabled.
+		 * There are also intermittent problems enumerating
+		 * devices with PPCD enabled.
+		 */
+		case 0x0d9d:
+			ehci_info(ehci, "disable lpm/ppcd for nvidia mcp89");
+			ehci->has_lpm = 0;
+			ehci->has_ppcd = 0;
+			ehci->command &= ~CMD_PPCEE;
+			break;
 		}
 		break;
 	case PCI_VENDOR_ID_VIA: