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Date: Mon, 14 Apr 2014 17:44:58 +0200 From: stefani@...bold.net To: Benjamin Herrenschmidt <benh@....ibm.com> Cc: linux-usb <linux-usb@...r.kernel.org>, linux-kernel@...r.kernel.org, Greg KH <greg@...ah.com>, Alan Stern <stern@...land.harvard.edu>, sarah.a.sharp@...ux.intel.com, Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com> Subject: Re: Missing USB XHCI and EHCI reset for kexec Zitat von Benjamin Herrenschmidt <benh@....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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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