Re: USB timeout during S3 suspend w/ NEC Corporation uPD720200

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Hi Thilo,
  looking into your previous lspci posts I see you might be affected by this hardware bug
in "Intel® 6 Series Express Chipset B2 stepping" chips having enabled SATA ports 2-5.

http://support.dell.com/support/topics/global.aspx/support/kcs/document?c=us&cs=04&docid=389728&l=en&s=bsd
http://www.intel.com/support/chipsets/6/sb/CS-032521.htm
http://www.intel.com/support/chipsets/6/sb/CS-032521.htm

  Second, just few days ago we sorted out on linux-pci that my Express Card chipset
does not report properly express card removal from the slot. 
(thread Re: 3.2.11: PCI Express card cannot be re-detected withing cca 60sec timeframe)
Interestingly, and that is why I am writing this email, it happens to me *only* with
express card having  uPD720200 as well (but I have 3028 firmware, the latest of the
3.x series because I have older harware). My express card slot chipset properly reports
when I unplug a FireWire express card or one providing 2 serial and 1 parallel port.
I do not know what is different with the NEC-based card. I can only say that USB3.0
throughput is 80MB/s while under Win 7 I get 146 MB/s using same hardware. Back to Linux,
an onboard Texas INstruments chipset providing USB 3.0 as well also give sme 146 MB/s,
so there is not a problem with xhci_hcd but with pci express chipset, DMA?, or its linux
driver making it slow.

  Finally, you can upgrade your NEC firmware with the tools and image from
http://www.station-drivers.com/page/renesas.htm . Pickup some of those
4.x firmwares and don't use the GUI, use the command line to determine your
flash chipset before doing backup and re-flashing.

Best,
Martin

Xu, Andiry wrote:
> Sorry for the top-posting.
> 
> I don't know what causes freeze - and NEC uPD720200 should work fine with suspend.
> Usually if the host suspend fail, the system should abort suspend and back into running state.
> You can try unload xhci-hcd before suspend and load it after resume. It should work. 
> Before xHCI suspend/resume is supported in 2.6.37, distrtibutions enter suspend use this way.
> 
> Thanks,
> Andiry 
> ________________________________________
> From: Thilo-Alexander Ginkel [thilo@xxxxxxxxxx]
> Sent: Tuesday, April 17, 2012 12:54 AM
> To: Xu, Andiry
> Cc: Sarah Sharp; linux-usb@xxxxxxxxxxxxxxx
> Subject: Re: USB timeout during S3 suspend w/ NEC Corporation uPD720200
> 
> On Tue, Mar 20, 2012 at 13:55, Thilo-Alexander Ginkel <thilo@xxxxxxxxxx> wrote:
>> On Tue, Mar 13, 2012 at 02:18, Xu, Andiry <Andiry.Xu@xxxxxxx> wrote:
>>>> It doesn't necessarily mean that the host got removed.  When the PCI
>>>> host controller goes into D3, the registers will read as 0xffffffff.  So
>>>> I suspect the host was just suspended when the polling loop ran.  We
>>>> need a better way for the polling loop to know the host controller died
>>>> instead of checking the registers.
>>>
>>> I agree with you, but for this case, the suspend is actually failed:
>>> Stop xHC in xhci_suspend() timeout and the function returns -110.
>>> The save state register is not set. I think the PCI host controller
>>> does not go into D3 in this case, right?
>>
>> P.S.: Just updated to 3.3 - I'll keep you updated whether the freezes
>> are still an issue...
> 
> Just had another freeze while running
> 
> Linux orion 3.3.1 #30 SMP Mon Apr 2 23:33:43 CEST 2012 x86_64 x86_64
> x86_64 GNU/Linux
> 
> Same symptoms, i.e., suspending fails with return code -110.
> 
> Do you have an idea what actually causes the freeze? Does the kernel
> wait until all devices are suspended (in my case infinitely)?
> 
> Would it be possible to work around the issue be letting the system
> enter S3 anyway and reinitialize the USB controller on resume? Can I
> force this by unloading the xhci module?
> 
> Thanks for your help!
> 
> Regards,
> Thilo
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