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[imperia <imperia777@xxxxxxxxx>]

** Also affects: linux (Debian)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1749961

Title:
  xhci_hcd: TRB DMA errors reported with ASMedia ASM1142 USB 3.1
  Controller

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Artful:
  In Progress
Status in linux source package in Bionic:
  In Progress
Status in linux package in Debian:
  New

Bug description:
  It was observed that while trying to use a 4K USB webcam connected to
  USB port provided by ASMedia ASM1142 USB 3.1 Controller, the webcam
  does not work and kernel log shows the following messages:

  [431.928016] xhci_hcd 0000:12:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13
  [431.928021] xhci_hcd 0000:12:00.0: Looking for event-dma 0000003f3330e020 trb-start 0000003f3330e000 trb-end 0000003f3330e000 seg-start 0000003f3330e000 seg-end 0000003f3330eff0
  [431.928024] xhci_hcd 0000:12:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13
  [431.928026] xhci_hcd 0000:12:00.0: Looking for event-dma 0000003f3330e030 trb-start 0000003f3330e000 trb-end 0000003f3330e000 seg-start 0000003f3330e000 seg-end 0000003f3330eff0
  [431.928027] xhci_hcd 0000:12:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13
  [431.928029] xhci_hcd 0000:12:00.0: Looking for event-dma 0000003f3330e050 trb-start 0000003f3330e000 trb-end 0000003f3330e000 seg-start 0000003f3330e000 seg-end 0000003f3330eff0
  [431.928386] xhci_hcd 0000:12:00.0: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13

  A similar issue was already reported on Launchpad:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1667750

  The fix to this issue seems to be the following patch:
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9da5a109

  Tests in our scenario with this patch proved still broken. Our next
  approach is to modify the patch a bit and re-test.

  This LP will be used to document our progress in the investigation.

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