| Date | Tue, 07 Dec 2010 16:59:45 -0800 | From | Greg KH <> | Subject | [208/289] USB: ehci: disable LPM and PPCD for nVidia MCP89 chips |
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2.6.36-stable review patch. If anyone has any objections, please let us know.
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From: Brian J. Tarricone <brian@tarricone.org>
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>
--- drivers/usb/host/ehci-pci.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
--- 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 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:
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