[PATCH 0/1][D][OEM-OSP1-B]Sometimes touchpad automatically trigger double click

AceLan Kao acelan.kao at canonical.com
Thu Jun 20 02:38:47 UTC 2019

BugLink: https://bugs.launchpad.net/bugs/1833484

Dell machines which uses goodix touchpad IC emit double click event
while touching the touchpad if designware i2c adapter is in runtime

Goodix re-assert the interrupt if host doesn't read the data within
100ms and designware takes a longer time to wake up from runtime
suspend. In the case, it got a second interrupt during resuming, so
it thinks it's a double click.

There is no simple way to fix this, it's a firmware issue and goodix
agrees to fix this in their firmware on next release, but this issue is
still affects the machines that don't come with an updated firmware. So,
add a quirk to mark those machines and avoid the designware from entering
runtime suspend.

[Regression Potential]
Low, it only affects the listed machines, and prevent designware from
entering runtime suspend impacts the power consumption little or none
during short or long idle.

This patch contains on going product name, so set it as SAUCE patch,
will submit it to upstream and to Bionic kernel later.

AceLan Kao (1):
  UBUNTU: SAUCE: i2c: designware: Add disable runtime pm quirk

 drivers/i2c/busses/i2c-designware-master.c | 30 ++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)


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