Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 14 Apr 2014 17:44:58 +0200 | From | stefani@seibold ... | Subject | Re: Missing USB XHCI and EHCI reset for kexec |
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Zitat von Benjamin Herrenschmidt <benh@au1.ibm.com>:
> On Sun, 2014-04-13 at 21:22 +0200, Stefani Seibold wrote: >> When executing a kexec kernel on a PowerPC board the new started kernel >> will not find already enumerated USB devices due a missing reset on the >> USB bus. >> >> As a work around a >> >> echo 1 >/sys/bus/pci/drivers/[ex]hci-pci/BUS-ADDRESS-OF-THE-HCD/reset >> >> will solve this. But this is far from beauty. >> >> My latest kernel without this issue was for EHCI kernel 2.6.39 and for >> XHCI kernel 3.4, but i have no idea when exactly this behavior was >> introduced. >> >> For X86 all is fine. > > I don't know about EHCI specifically but this is a known issue with > XHCI, I observe similar issues on other powerpc platforms (servers) > and this isn't architecture specific (looks more like actualy xhc > implementation specific). > > Thadeu Cascardo (on CC) has been the one investigating that on our side, > he might have more to add including patches. >
I have now a kernel 3.14 dmesg log of the problem. After a kexec the kexeced 3.14 kernel shows:
[ 1.170029] xhci_hcd 0001:03:00.0: xHCI Host Controller [ 1.175306] xhci_hcd 0001:03:00.0: new USB bus registered, assigned bus number 1 [ 1.212561] xhci_hcd 0001:03:00.0: Host not halted after 16000 microseconds. [ 1.219621] xhci_hcd 0001:03:00.0: can't setup: -110 [ 1.224597] xhci_hcd 0001:03:00.0: USB bus 1 deregistered [ 1.230021] xhci_hcd 0001:03:00.0: init 0001:03:00.0 fail, -110 [ 1.235955] xhci_hcd: probe of 0001:03:00.0 failed with error -110
Any idea?
- Stefani
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