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ata: Fix SATA_MOBILE_LPM_POLICY description in Kconfig

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[ Upstream commit ed62a62a18bc144f73eadf866ae46842e8f6606e ]

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>
[ Adjust context ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
This commit is contained in:
Damien Le Moal
2025-08-21 14:26:54 -04:00
committed by Ulrich Hecht
parent e6beb7b0b3
commit fafc7fedb6
1 changed files with 26 additions and 9 deletions
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35
drivers/ata/Kconfig
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@@ -94,22 +94,39 @@ config SATA_AHCI
config SATA_MOBILE_LPM_POLICY
int "Default SATA Link Power Management policy for mobile chipsets"
range 0 4
range 0 5
default 0
depends on SATA_AHCI
help
Select the Default SATA Link Power Management (LPM) policy to use
for mobile / laptop variants of chipsets / "South Bridges".
The value set has the following meanings:
0 => Keep firmware settings
1 => Maximum performance
2 => Medium power
3 => Medium power with Device Initiated PM enabled
4 => Minimum power
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).
Note "Minimum power" is known to cause issues, including disk
corruption, with some disks and should not be used.
The possible values for the default SATA link power management
policies are:
0 => Keep firmware settings
1 => No power savings (maximum performance)
2 => HIPM (Partial)
3 => HIPM (Partial) and DIPM (Partial and Slumber)
4 => HIPM (Partial and DevSleep) and DIPM (Partial and Slumber)
5 => HIPM (Slumber and DevSleep) and DIPM (Partial and Slumber)
Excluding the value 0, higher values represent policies with higher
power savings.
config SATA_AHCI_PLATFORM
tristate "Platform AHCI SATA support"