[Bug 240339] [ig4] I2C2 (touchpad bus) broken on the Google Pixelbook (Sunrise Point PCH)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240339

--- Comment #18 from commit-hook at freebsd.org ---
A commit references this bug:

Author: wulf
Date: Thu Sep 12 12:33:09 UTC 2019
New revision: 352243
URL: https://svnweb.freebsd.org/changeset/base/352243

Log:
  ig4(4): Fix SDA HOLD time set too low on Skylake controllers

  Execution of "Soft reset" command (IG4_REG_RESETS_SKL) at controller init
  stage sets SDA_HOLD register value to 0x0001 which is often too low for
  normal operation.

  Set SDA_HOLD back to 28 after reset to restore controller functionality.

  PR:           240339
  Reported by:  imp, GregV, et al.
  MFC after:    3 days

Changes:
  head/sys/dev/ichiic/ig4_iic.c

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