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[Leann Ogasawara <leann.ogasawara@xxxxxxxxxxxxx>]

** Changed in: intel
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1270736

Title:
  [Trusty Patch] intel_pstate: Add setting voltage value for baytrail P
  states

Status in intel:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Released

Bug description:
  There's a bug that kernel fails to boot with intel_pstate enabled on
  BayTrail-M which said: Problem only occurs on 4 core Pentium CPU. It
  appears to be a race condition in the kernel that only happens when
  intel_pstate sets the processor to run at it's highest speed early in
  the boot process, so not a intel_pstate problem per se, just exposed
  by intel_pstate.

  This bug is fixed by this patch which is queued for 3.14-rc1 and market for 3.13 stable.
  https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=007bea098b869945a462420a1f9d442ff169f722  

  intel_pstate: Add setting voltage value for baytrail P states.
  Baytrail requires setting P state and voltage pairs when adjusting the
  requested P state.  Add function for retrieving the valid voltage
  values and modify *_set_pstate() functions to caluclate the
  appropriate voltage for the requested P state.

  Signed-off-by: Dirk Brandewie <dirk.j.brandewie@xxxxxxxxx>
  Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

  Please consider to include this patch in Trusty.

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