[PATCH 0/1][SRU][F][G][H][OEM-5.10] Dell Precision 5550 takes up to 10 seconds to respond when coming out of sleep

[AceLan Kao]

From: "Chia-Lin Kao (AceLan)" <acelan.kao at canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1919123

[Impact]
On some platforms, the EC doesn't support the register reading sequence
for sentelic[1], and then make the EC can't respond commands for a while
when probing. It leads to the keyboard is non-responsive for around 10
seconds while waking up from s2idle.

[ 44.304488] i8042: [9804] d4 -> i8042 (command)
[ 44.304634] i8042: [9804] f3 -> i8042 (parameter)
[ 44.304787] i8042: [9804] fa <- i8042 (interrupt, 1, 12)
[ 44.304855] i8042: [9804] d4 -> i8042 (command)
[ 44.304938] i8042: [9804] 66 -> i8042 (parameter)
[ 44.337698] i8042: [9813] d4 -> i8042 (command)
[ 44.905695] i8042: [9942] 88 -> i8042 (parameter)
[ 45.497478] i8042: [10102] d4 -> i8042 (command)
[ 46.098041] i8042: [10253] f3 -> i8042 (parameter)
[ 46.098070] i8042: [10253] fe <- i8042 (interrupt, 1, 12)
[ 46.718154] i8042: [10386] d4 -> i8042 (command)
[ 47.309915] i8042: [10386] f4 -> i8042 (parameter)
[ 47.918961] i8042: [10556] d4 -> i8042 (command)
[ 48.402624] i8042: [10556] f6 -> i8042 (parameter)

[Fix]
A DMI quirk to mark this platform doesn't have aux device could avoid
those commands to be sent. And the system could still using i2c
interface to communicate with the touchpad.
https://lkml.org/lkml/2021/3/15/126

[Test]
Verified on Dell Precision 5550

[Where problem could occur]
The quirk only affects the listed platform, there is no regression could occur.

Chia-Lin Kao (AceLan) (1):
  UBUNTU: SAUCE: Input: i8042 - add dmi quirk

 drivers/input/serio/i8042.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

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2.25.1