Public bug reported:

ea642c3216cb ("drm/ttm: add io_mem_pfn callback") is incomplete: the
hisilicon hibmc driver does not contain the callback and so X does not
start.

Discussion and potential fix at https://lists.freedesktop.org/archives
/dri-devel/2017-November/159002.html

This affects Artful, upstream has not landed on a solution yet as far as
I can tell, so lets backport the first proposed small fix.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Daniel Axtens (daxtens)
         Status: New

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https://bugs.launchpad.net/bugs/1738334

Title:
  hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add
  io_mem_pfn callback")

Status in linux package in Ubuntu:
  New

Bug description:
  ea642c3216cb ("drm/ttm: add io_mem_pfn callback") is incomplete: the
  hisilicon hibmc driver does not contain the callback and so X does not
  start.

  Discussion and potential fix at https://lists.freedesktop.org/archives
  /dri-devel/2017-November/159002.html

  This affects Artful, upstream has not landed on a solution yet as far
  as I can tell, so lets backport the first proposed small fix.

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