linux-kernel - Re: [PATCH] scsi: docs: Add description for missing options of link_power_management

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Message-ID: <0282b93c-7d14-48ce-9706-d92ffcb64811@gmail.com>
Date: Thu, 15 Jan 2026 14:55:55 +0800
From: Yiwei Lin <s921975628@...il.com>
To: Randy Dunlap <rdunlap@...radead.org>, corbet@....net,
 linux-doc@...r.kernel.org
Cc: hdegoede@...hat.com, srinivas.pandruvada@...ux.intel.com,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: docs: Add description for missing options of
 link_power_management_policy


On 1/15/2026 2:34 PM, Randy Dunlap wrote:
> Hi,
>
> On 1/14/26 7:29 PM, Yiwei Lin wrote:
>> 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@...il.com>
>> ---
>>   .../scsi/link_power_management_policy.rst       | 17 ++++++++++++++---
>>   1 file changed, 14 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/scsi/link_power_management_policy.rst b/Documentation/scsi/link_power_management_policy.rst
>> index 64288dcf1..07fbfd937 100644
>> --- a/Documentation/scsi/link_power_management_policy.rst
>> +++ b/Documentation/scsi/link_power_management_policy.rst
>> @@ -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:
>>   
> These table headings lines (the ===== lines) need to be as long or longer than
> the text. keep_firmware_settings and min_power_with_partial are longer than the
> headings ===== line.
> Please extend the Value column headings ===== line by one character (just
> replace a space by '=') to avoid these warnings:
>
> Documentation/scsi/link_power_management_policy.rst:26: ERROR: Malformed table.
> Text in column margin in table line 17.
>
Thanks for pointing that out. I just sent a V2 patch for the fix.
>>   =====================   =====================================================
>>   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.
>>   =====================   =====================================================