Re: [Xen-devel] xHCI not waking up from D3 after S3 Resume on Ivybridge

[Tom Goetz <tom.goetz@xxxxxxxxxxxxxxxxxxx>]

On Mar 15, 2012, at 10:35 AM, Tom Goetz wrote:

> 
> On Mar 14, 2012, at 1:46 PM, Tom Goetz wrote:
> 
>> 
>> On Mar 14, 2012, at 12:57 PM, Sarah Sharp wrote:
>> 
>>> On Wed, Mar 14, 2012 at 09:52:28AM -0400, Tom Goetz wrote:
>>>> 
>>>>> 
>>>>> Why were you posting there in particular?  You're much more likely to
>>>>> get your USB questions answered on this mailing list. :)
>>>> 
>>>> I'm concerned that this may be a bug in the Xen PVOPs MSI code. To that 
>>>> end I've posted updates on xen-devel here:
>>>> 
>>>> http://lists.xen.org/archives/html/xen-devel/2012-03/msg00904.html
>>>> http://lists.xen.org/archives/html/xen-devel/2012-03/msg00727.html
>>>> http://lists.xen.org/archives/html/xen-devel/2012-03/msg00978.html
>>> 
>>> Does the xHCI host work fine without Xen?  I.e. running Linux directly
>>> as the host OS, suspending, resuming, and then plugging in a device?
>> 
>> It works in Ubuntu 12.04 Beta 1 with Linux 3.2.0. So it's either broken 
>> between 3.2.0 and 3.2.5 or it's broken in Xen. I haven't made a direct 
>> comparison yet. I'm putting Ubuntu on my SDP now to test that.
> 
> xHCI wakes up from D3 on the SDP with Ubuntu 12.04 Beta 1 and 3.2.11. This 
> fails with the same 3.2.11 kernel and Xen. So the problem is Xen related.

Another update.

On the Ivybridge laptop, xHCI is not waking up because when I plug a device 
into a xHCI port the ACPI wakeup events are going to the e1000e. Pre S3, it 
eventually gets a interrupt from the device that wakes it up. Post S3 it never 
gets an interrupt from the device.

On the SDP, I get ACPI wake up calls for the xHCI before S3, but not after. 
Both cases work with out Xen. I'm assuming Xen/PVOPs is leaving the device in a 
state the causes the ACPI wake up events to be masked. Can you tell me what 
what state that could be? I can look at decompiling the ASL to find out, but 
that's not my first choice. Toggling the power policy (auto->on->auto) does not 
fix delivery of ACPI wake up events for this device. I am still getting ACPI 
wake ups for the e1000e, so it's not all wake ups that are blocked.

Thanks for any help.

-Tom
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