linux-kernel - Re: [PATCH v2] scsi: docs: Add description for missing options of link_power_management

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Message-ID: <6872edf2-b005-4b8e-be01-b8fa5d17222b@infradead.org>
Date: Wed, 14 Jan 2026 23:00:03 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Yiwei Lin <s921975628@...il.com>, corbet@....net,
 linux-doc@...r.kernel.org
Cc: hdegoede@...hat.com, srinivas.pandruvada@...ux.intel.com,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scsi: docs: Add description for missing options of
 link_power_management_policy



On 1/14/26 10:53 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>


Tested-by: Randy Dunlap <rdunlap@...radead.org>

Thanks.

> ---
>  .../scsi/link_power_management_policy.rst     | 23 ++++++++++++++-----
>  1 file changed, 17 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/scsi/link_power_management_policy.rst b/Documentation/scsi/link_power_management_policy.rst
> index 64288dcf1..e350892cc 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:
>  
> -=====================   =====================================================
> +======================  =====================================================
>  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.
> +======================  =====================================================

-- 
~Randy