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[Anthony Wong <anthony.wong@xxxxxxxxxx>]

** Changed in: hwe-next
     Assignee: (unassigned) => Phidias (phidias-chiang)

** Changed in: hwe-next
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1518855

Title:
  Backport better suspend/resume function for pinctrl-cherryview

Status in HWE Next:
  Triaged
Status in linux package in Ubuntu:
  Triaged

Bug description:
  [Impact]
  On some platforms the touchpad relies on pinctrl devices to provide GPIO interrupt, but in 3.19.0 pinctrl-cherryview doesn't support suspend well and will lose the config after suspend/resume, then touchpad can't be used.

  [Fix]
  There's a commit in 4.0-rc1 to add suspend/resume for pinctrl-cherryview:

  commit 9eb457b547cc731bc2fc251bd79891a60c64fc3e
  Refs: [HEAD]
  Author: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
  Date: Thu Dec 4 12:32:50 2014 +0200

      pinctrl: cherryview: Save and restore pin configs over system sle

  which can be clean cherry-picked

  [Test]
  3.19.0-33 -> failed
  4.2-> passed
  4.0, 4.1 -> Can't suspend due to graphic driver failed so can't use to test
  3.19.0-33 + patched module -> passed

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