Bug 4325 - Add support for PxSCT.LPM set based on actual LPM circumstances
Summary: Add support for PxSCT.LPM set based on actual LPM circumstances
Status: NEW
Alias: None
Product: ANCK 4.19 Dev
Classification: ANCK
Component: drivers (show other bugs) drivers
Version: unspecified
Hardware: All Linux
: P3-Medium S3-normal
Target Milestone: ---
Assignee: LeoLiu-oc
QA Contact: shuming
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Reported: 2023-03-02 20:22 UTC by LeoLiu-oc
Modified: 2023-08-17 18:19 UTC (History)
2 users (show)

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Description LeoLiu-oc zhaoxin_group 2023-03-02 20:22:01 UTC 
Description of problem:
AHCI Spec shows that the PxSCTL.IPM field in each port must be programmed
to disallow device initiated LPM requests when HBA can not support
transitions to the LPM state. The current LPM driver has no restrictions
on LPM transitions when enabling device initiated LPM.

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