diff options
Diffstat (limited to 'drivers/usb/host/ehci-pci.c')
| -rw-r--r-- | drivers/usb/host/ehci-pci.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index a1e8d273103f..655f3c9f88bf 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: |