Commit 20f73d6f authored by Yiwei Lin's avatar Yiwei Lin Committed by Jonathan Corbet
Browse files

scsi: docs: Add description for missing options of link_power_management_policy 



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

Signed-off-by: default avatarYiwei Lin <s921975628@gmail.com>
Tested-by: default avatarRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
Message-ID: <20260115065341.10230-1-s921975628@gmail.com>
parent 3c5fefc8

Documentation/scsi/link_power_management_policy.rst

+17 −6
Original line number Diff line number Diff line
@@ -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.

======================  =====================================================