Re: xHCI reports “ERROR Unknown event condition 20, HC probably busted”

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On Sat, Aug 29, 2015 at 12:17:25AM +0200, Steinar H. Gunderson wrote:
> I've noticed (with the CONFIG_PM=y kernel) that sometimes this comes up when
> inserting the device:
> 
> [  136.370917] usb 3-2: Set SEL for device-initiated U2 failed.
> 
> I don't know if it's relevant.

I've also noticed these started coming now, although I'm not sure if they
are related; I see DMAR is mentioned, so it might be related to the fact
that I gave the device to KVM (via VT-d) a bit earlier in the same boot
(although qemu was long shut down by this point):

[ 8240.586544] DMAR: DRHD: handling fault status reg 3
[ 8240.586560] DMAR: DMAR:[DMA Write] Request device [00:14.0] fault addr ffef0000 
               DMAR:[fault reason 05] PTE Write access is not set
[ 8240.586665] DMAR: DRHD: handling fault status reg 3
[ 8240.586678] DMAR: DMAR:[DMA Write] Request device [00:14.0] fault addr ffee8000 
               DMAR:[fault reason 05] PTE Write access is not set
[ 8240.586792] DMAR: DRHD: handling fault status reg 3
[ 8240.586803] DMAR: DMAR:[DMA Write] Request device [00:14.0] fault addr ffee0000 
               DMAR:[fault reason 05] PTE Write access is not set
[ 8240.586813] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 6 comp_code 13
[ 8240.586824] xhci_hcd 0000:00:14.0: Looking for event-dma 00000000fff5cf40 trb-start 00000000ffa86520 trb-end 00000000ffa86520 seg-start 00000000ffa86000 seg-end 00000000ffa86ff0
[ 8240.586839] xhci_hcd 0000:00:14.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 6 comp_code 13
[ 8240.586847] xhci_hcd 0000:00:14.0: Looking for event-dma 00000000fff5cf50 trb-start 00000000ffa86520 trb-end 00000000ffa86520 seg-start 00000000ffa86000 seg-end 00000000ffa86ff0

/* Steinar */
-- 
Homepage: http://www.sesse.net/
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