On Sun, 7 Aug 2016, ican realizeum wrote: > > This doesn't seem like anything you need to worry about. If it only > > happens on shutdown or reboot then it won't affect your use of the > > computer. > Cool! > So, apparently something(?) is turning off something(as in power > off/suspend?), so that the poweroff functionality from kernel is > currently unable to flush drive cache or put drive into standby mode > during the poweroff which it needs to do. I don't know anything about that. > So whatever that is, is > probably the one that's doing this "HC died" thing too. So I don't > think I should worry, as you said anyways. _Something_ is trying to start up your OHCI controllers at shutdown time. I don't know what or why, but it isn't working. Since you don't have any devices connected to those controllers, the failure doesn't hurt anything. > > Furthermore, the lsusb output says you don't have any USB devices > > plugged into either of the OHCI controllers. Have you tried seeing > > what happens if there is something plugged in (say, a keyboard or > > mouse)? > I haven't. > I occasionally plug in a USB stick which seems to work fine, so far. > > > > Also, what do you get in the "registers" files under > > /sys/kernel/debug/usb/ohci/*/ after you change the runtime PM setting > > to "on"? (You'll need to mount a debugfs filesystem for this.) > When 'auto': > # cat /sys/kernel/debug/usb/ohci/*/registers > bus pci, device 0000:00:12.0 > OHCI PCI host controller > ohci_hcd > SUSPENDED (no register access) > bus pci, device 0000:00:13.0 > OHCI PCI host controller > ohci_hcd > SUSPENDED (no register access) > ---------- > When 'on': > # cat /sys/kernel/debug/usb/ohci/*/registers > bus pci, device 0000:00:12.0 > OHCI PCI host controller > ohci_hcd > OHCI 1.0, NO legacy support registers, rh state suspended > control 0x6c3 RWE RWC HCFS=suspend CBSR=3 > cmdstatus 0x00000 SOC=0 > intrstatus 0x00000004 SF > intrenable 0x8000005a MIE RHSC UE RD WDH > hcca frame 0x00ae > fmintvl 0x27782edf FSMPS=0x2778 FI=0x2edf > fmremaining 0x00000c5c FR=0x0c5c > periodicstart 0x2a2f > lsthresh 0x0628 > hub poll timer off > roothub.a 02000205 POTPGT=2 NPS NDP=5(5) > roothub.b 00000000 PPCM=0000 DR=0000 > roothub.status 00008000 DRWE > roothub.portstatus [0] 0x00000100 PPS > roothub.portstatus [1] 0x00000100 PPS > roothub.portstatus [2] 0x00000100 PPS > roothub.portstatus [3] 0x00000100 PPS > roothub.portstatus [4] 0x00000100 PPS > bus pci, device 0000:00:13.0 > OHCI PCI host controller > ohci_hcd > OHCI 1.0, NO legacy support registers, rh state suspended > control 0x6c3 RWE RWC HCFS=suspend CBSR=3 > cmdstatus 0x00000 SOC=0 > intrstatus 0x00000004 SF > intrenable 0x8000005a MIE RHSC UE RD WDH > hcca frame 0x00bb > fmintvl 0xa7782edf FIT FSMPS=0xa778 FI=0x2edf > fmremaining 0x800012ff FRT FR=0x12ff > periodicstart 0x2a2f > lsthresh 0x0628 > hub poll timer off > roothub.a 02000205 POTPGT=2 NPS NDP=5(5) > roothub.b 00000000 PPCM=0000 DR=0000 > roothub.status 00008000 DRWE > roothub.portstatus [0] 0x00000100 PPS > roothub.portstatus [1] 0x00000100 PPS > roothub.portstatus [2] 0x00000100 PPS > roothub.portstatus [3] 0x00000100 PPS > roothub.portstatus [4] 0x00000100 PPS Ah, yes. The ohci-hcd driver puts its controllers into suspend even if runtime PM isn't enabled. That's a holdover from before Linux's runtime PM was written. I suppose it's not needed any more, but keeping it doesn't hurt -- and it explains why those errors continue to show up even after you write "on" to power/control. > Thanks Alan! > > I have worked around the shutdown issue that was preventing my SSD > from gracefully shutdown and this USB issue seems to not affect me > anyways. > (details here btw: https://bugzilla.kernel.org/show_bug.cgi?id=151631 ) > > Thanks and sorry for the spam. But if I can do anything to help with > testing patches or anything regarding usb issue(s) I'd be happy to. If you're curious to see what is causing the controllers to resume, you could add a "dump_stack();" line to drivers/usb/host/ohci-hub.c in the ohci_rh_resume() routine immediately after the line that says: ohci_err (ohci, "controller won't resume\n"); You should set power/control to "on" when testing this. Alan Stern -- 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
