linux-kernel - Re: [PATCH] xhci: Add reset on resume quirk for asrock p67 host

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Date:	Thu, 16 Jun 2011 00:15:16 +0200
From:	Maarten Lankhorst <m.b.lankhorst@...il.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
CC:	Alan Stern <stern@...land.harvard.edu>, linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xhci: Add reset on resume quirk for asrock p67 host

Op 15-06-11 23:41, Maarten Lankhorst schreef:
> Op 15-06-11 23:21, Sarah Sharp schreef:
>> On Wed, Jun 15, 2011 at 05:00:17PM -0400, Alan Stern wrote:
>>> On Wed, 15 Jun 2011, Sarah Sharp wrote:
>>>
>>>> On Wed, Jun 15, 2011 at 10:29:01PM +0200, Maarten Lankhorst wrote:
>>>>> The asrock p67 xhci controller completely dies on resume,
>>>>> add a quirk for this, to bring the host back online after a suspend.
>>>>>
>>>>> This should be backported to stable kernels as far back as 2.6.34.
>>>> Why 2.6.34?  Only kernels as old as 2.6.37 had xHCI suspend and resume
>>>> support.  Before 2.6.37, the xHCI driver would prevent the system from
>>>> suspending at all.
>>>>
>>>> Otherwise looks fine.
>>>>
>>>> Sarah Sharp
>>>>
>>>>> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
>>>>> index 06e7023..42fd032 100644
>>>>> --- a/drivers/usb/host/xhci.c
>>>>> +++ b/drivers/usb/host/xhci.c
>>>>> @@ -759,6 +759,8 @@ int xhci_resume(struct xhci_hcd *xhci, bool hibernated)
>>>>>  		msleep(100);
>>>>>  
>>>>>  	spin_lock_irq(&xhci->lock);
>>>>> +	if (xhci->quirks & XHCI_RESET_ON_RESUME)
>>>>> +		hibernated = 0;
>>> Shouldn't this be "hibernated = true;"?  You want the driver to treat 
>>> suspend as though it were hibernation, not the other way around.
>> Yes, good catch.  Maarten, can you respin this patch (and with the
>> note that it should be backported as far as 2.6.37).
>>
>> Sarah Sharp
> Odd! I could have sworn I had a succesful suspend with the quirk printed
> in dmesg. The hang appears to not happen 100% of the time then. Weird,
> wish I had saved the log. Will respin the patch.
>
> Of course the act of observing made it impossible to reproduce. :-/
>
> ~Maarten
I cannot be 100% sure, but normally on suspend I saw 'HC died'. This
time I *think* a urb submit timed out instead, but I cannot reproduce
it now. I just assume it was user error though, still weird.

Fixed patch reliably works without errors, surviving 20 suspends.
The other one only worked once it seems, discard as anomaly please.
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