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ata: Fix SATA_MOBILE_LPM_POLICY description in Kconfig 

Improve the description of the possible default SATA link power
management policies and add the missing description for policy 5.
No functional changes.

Fixes: a5ec5a7bfd ("ata: ahci: Support state with min power but Partial low power state")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
pull/1309/head
Damien Le Moal 2025-06-18 16:25:19 +09:00
parent cb45e3ff43
commit ed62a62a18
1 changed files with 24 additions and 8 deletions
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32
drivers/ata/Kconfig
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@ -117,23 +117,39 @@ config SATA_AHCI
config SATA_MOBILE_LPM_POLICY config SATA_MOBILE_LPM_POLICY
int "Default SATA Link Power Management policy" int "Default SATA Link Power Management policy"
range 0 4 range 0 5
default 3 default 3
depends on SATA_AHCI depends on SATA_AHCI
help help
Select the Default SATA Link Power Management (LPM) policy to use Select the Default SATA Link Power Management (LPM) policy to use
for chipsets / "South Bridges" supporting low-power modes. Such for chipsets / "South Bridges" supporting low-power modes. Such
chipsets are ubiquitous across laptops, desktops and servers. chipsets are ubiquitous across laptops, desktops and servers.
Each policy combines power saving states and features:
- Partial: The Phy logic is powered but is in a reduced power
state. The exit latency from this state is no longer than
10us).
- Slumber: The Phy logic is powered but is in an even lower power
state. The exit latency from this state is potentially
longer, but no longer than 10ms.
- DevSleep: The Phy logic may be powered down. The exit latency from
this state is no longer than 20 ms, unless otherwise
specified by DETO in the device Identify Device Data log.
- HIPM: Host Initiated Power Management (host automatically
transitions to partial and slumber).
- DIPM: Device Initiated Power Management (device automatically
transitions to partial and slumber).
The value set has the following meanings: The possible values for the default SATA link power management
policies are:
0 => Keep firmware settings 0 => Keep firmware settings
1 => Maximum performance 1 => No power savings (maximum performance)
2 => Medium power 2 => HIPM (Partial)
3 => Medium power with Device Initiated PM enabled 3 => HIPM (Partial) and DIPM (Partial and Slumber)
4 => Minimum power 4 => HIPM (Partial and DevSleep) and DIPM (Partial and Slumber)
5 => HIPM (Slumber and DevSleep) and DIPM (Partial and Slumber)
Note "Minimum power" is known to cause issues, including disk Excluding the value 0, higher values represent policies with higher
corruption, with some disks and should not be used. power savings.
config SATA_AHCI_PLATFORM config SATA_AHCI_PLATFORM
tristate "Platform AHCI SATA support" tristate "Platform AHCI SATA support"