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scsi: docs: Add description for missing options of link_power_management_policy

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With the kernel update we have more different policy for SCSI
link power management. Add the corresponding description to
the file.

Signed-off-by: Yiwei Lin <s921975628@gmail.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260115065341.10230-1-s921975628@gmail.com>
This commit is contained in:
Yiwei Lin
2026-01-15 14:53:41 +08:00
committed by Jonathan Corbet
parent 3c5fefc8f1
commit 20f73d6fc2
1 changed files with 17 additions and 6 deletions
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23
Documentation/scsi/link_power_management_policy.rst
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@@ -5,13 +5,13 @@ Link Power Managent Policy
==========================
This parameter allows the user to set the link (interface) power management.
There are 3 possible options:
There are 6 possible options:
===================== =====================================================
====================== =====================================================
Value Effect
===================== =====================================================
min_power Tell the controller to try to make the link use the
least possible power when possible. This may
====================== =====================================================
min_power Enable slumber mode(no partial mode) for the link to
use the least possible power when possible. This may
sacrifice some performance due to increased latency
when coming out of lower power states.
@@ -22,4 +22,15 @@ max_performance Generally, this means no power management. Tell
medium_power Tell the controller to enter a lower power state
when possible, but do not enter the lowest power
state, thus improving latency over min_power setting.
===================== =====================================================
keep_firmware_settings Do not change the current firmware settings for
Power management. This is the default setting.
med_power_with_dipm Same as medium_power, but additionally with
Device-initiated power management(DIPM) enabled,
as Intel Rapid Storage Technology(IRST) does.
min_power_with_partial Same as min_power, but additionally with partial
power state enabled, which may improve performance
over min_power setting.
====================== =====================================================