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USB: ehci: disable LPM and PPCD for nVidia MCP89 chips

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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>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Brian J. Tarricone 2010-11-21 21:15:52 -08:00 committed by Greg Kroah-Hartman
parent 6fdbad8021
commit a85b4e7f44
1 changed files with 12 additions and 0 deletions
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12
drivers/usb/host/ehci-pci.c
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@ -161,6 +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: