This is a note to let you know that I've just added the patch titled
USB: ehci: disable LPM and PPCD for nVidia MCP89 chips
to the 2.6.36-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-ehci-disable-lpm-and-ppcd-for-nvidia-mcp89-chips.patch
and it can be found in the queue-2.6.36 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From a85b4e7f4481c5a1ca89fa63c9c871151965075e Mon Sep 17 00:00:00 2001
From: Brian J. Tarricone <[email protected]>
Date: Sun, 21 Nov 2010 21:15:52 -0800
Subject: USB: ehci: disable LPM and PPCD for nVidia MCP89 chips
From: Brian J. Tarricone <[email protected]>
commit a85b4e7f4481c5a1ca89fa63c9c871151965075e upstream.
Tested on MacBookAir3,1. Without this, we get EPROTO errors when
fetching device config descriptors.
Signed-off-by: Brian Tarricone <[email protected]>
Reported-by: Benoit Gschwind <[email protected]>
Tested-by: Edgar Hucek <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
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:
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.36/usb-ehci-disable-lpm-and-ppcd-for-nvidia-mcp89-chips.patch
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