[PATCH 0/1][SRU][OEM-5.10] Intel e1000e blocks the system to enter PC10 on TGL platform
AceLan Kao
acelan.kao at canonical.com
Mon Mar 15 06:53:27 UTC 2021
From: "Chia-Lin Kao (AceLan)" <acelan.kao at 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.
[Misc]
Currently, this commit is not accepted and a v2 is expected. So, submit
this commit to oem kernel only and will revert it and submit final version
of this patch to ubuntu kernels later.
David E. Box (1):
UBUNTU: SAUCE: platform/x86: intel_pmc: Ignore GBE LTR on Tiger Lake
platforms
drivers/platform/x86/intel_pmc_core.c | 55 ++++++++++++++++++++-------
1 file changed, 42 insertions(+), 13 deletions(-)
--
2.25.1
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