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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
