diff options
| author | Brian J. Tarricone <brian@tarricone.org> | 2010-11-21 21:15:52 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-12-09 13:33:07 -0800 |
| commit | f9a65bd413df09aaee5b013a2e51fd4aece687fa (patch) | |
| tree | 82d05394ac9232e8e1e6928bd5b9e6122e3ff412 | |
| parent | 0eff1c751657595c809d0d4d350ec529d345658c (diff) | |
USB: ehci: disable LPM and PPCD for nVidia MCP89 chips
commit a85b4e7f4481c5a1ca89fa63c9c871151965075e upstream.
Tested on MacBookAir3,1. Without this, we get EPROTO errors when
fetching device config descriptors.
Signed-off-by: Brian Tarricone <brian@tarricone.org>
Reported-by: Benoit Gschwind <gschwind@gnu-log.net>
Tested-by: Edgar Hucek <gimli@dark-green.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/host/ehci-pci.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index a1e8d273103f..8d24d1c5e6a2 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -148,6 +148,18 @@ 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: |