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Commit a85b4e7f authored by Brian J. Tarricone's avatar Brian J. Tarricone Committed by Greg Kroah-Hartman
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USB: ehci: disable LPM and PPCD for nVidia MCP89 chips 



Tested on MacBookAir3,1.  Without this, we get EPROTO errors when
fetching device config descriptors.

Signed-off-by: default avatarBrian Tarricone <brian@tarricone.org>
Reported-by: default avatarBenoit Gschwind <gschwind@gnu-log.net>
Tested-by: default avatarEdgar Hucek <gimli@dark-green.com>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 6fdbad80

drivers/usb/host/ehci-pci.c

+12 −0
Original line number Diff line number Diff line
@@ -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: