[Bug 240339] [ig4] I2C2 (touchpad bus) broken on the Google Pixelbook (Sunrise Point PCH)
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Sun Sep 15 19:17:20 UTC 2019
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240339
--- Comment #19 from commit-hook at freebsd.org ---
A commit references this bug:
Author: wulf
Date: Sun Sep 15 19:16:42 UTC 2019
New revision: 352362
URL: https://svnweb.freebsd.org/changeset/base/352362
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.
Changes:
_U stable/12/
stable/12/sys/dev/ichiic/ig4_iic.c
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