diff options
Diffstat (limited to 'drivers/ata/Kconfig')
| -rw-r--r-- | drivers/ata/Kconfig | 36 |
1 files changed, 26 insertions, 10 deletions
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig index e00536b49552..120a2b7067fc 100644 --- a/drivers/ata/Kconfig +++ b/drivers/ata/Kconfig @@ -117,23 +117,39 @@ config SATA_AHCI config SATA_MOBILE_LPM_POLICY int "Default SATA Link Power Management policy" - range 0 4 + range 0 5 default 3 depends on SATA_AHCI help Select the Default SATA Link Power Management (LPM) policy to use for chipsets / "South Bridges" supporting low-power modes. Such chipsets are ubiquitous across laptops, desktops and servers. - - The value set has the following meanings: + 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 possible values for the default SATA link power management + policies are: 0 => Keep firmware settings - 1 => Maximum performance - 2 => Medium power - 3 => Medium power with Device Initiated PM enabled - 4 => Minimum power - - Note "Minimum power" is known to cause issues, including disk - corruption, with some disks and should not be used. + 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" |