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[0/1,SRU,H] Intel e1000e blocks the system to enter

Message ID 20210730080921.999677-1-acelan.kao@canonical.com
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Series Intel e1000e blocks the system to enter | expand

Message

AceLan Kao July 30, 2021, 8:09 a.m. UTC
From: "Chia-Lin Kao (AceLan)" <acelan.kao@canonical.com>

BugLink: https://bugs.launchpad.net/bugs/1919116

[Impact]
The deepest package cstate is PC9 and fails to enter low power mode during
s2i on Tiger Lake platform.

[Fix]
Intel provides a fix for TGL platform
https://patchwork.kernel.org/project/platform-driver-x86/patch/20210305190608.1834164-1-david.e.box@linux.intel.com/

[Test]
Verified on Dell TGL platforms and it works as expected.

[Where problem could occur]
It actually adds a quirk for tgl platform to ignore Latency Tolerance
Reporting (LTR) in pmc_core driver, that makes GBE on TGL won't block the
system to enter deeper PC state. It should be safe for all TGL platforms.

David E. Box (1):
  platform/x86: intel_pmc_core: Ignore GBE LTR on Tiger Lake platforms

 drivers/platform/x86/intel_pmc_core.c | 9 +++++++++
 1 file changed, 9 insertions(+)