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| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2018-07-27 22:47:02 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2018-07-30 16:09:10 +0200 |
| commit | a5ec5a7bfd1f28d1905499641c9f589be36808c1 (patch) | |
| tree | 592320d7a604f9ca492a29a293983231bbe19a1b /include | |
| parent | Revert "ata: ahci_platform: convert kcalloc to devm_kcalloc" (diff) | |
| download | linux-a5ec5a7bfd1f28d1905499641c9f589be36808c1.tar.xz linux-a5ec5a7bfd1f28d1905499641c9f589be36808c1.zip | |
ata: ahci: Support state with min power but Partial low power state
Currently when min_power policy is selected, the partial low power state
is not entered and link will try aggressively enter to only slumber state.
Add a new policy which still enable DEVSLP but also try to enter partial
low power state. This policy is presented as "min_power_with_partial".
For information the difference between partial and slumber
Partial – PHY logic is powered up, and in a reduced power state. The link
PM exit latency to active state maximum is 10 ns.
Slumber – PHY logic is powered up, and in a reduced power state. The link
PM exit latency to active state maximum is 10 ms.
Devslp – PHY logic is powered down. The link PM exit latency from this
state to active state maximum is 20 ms, unless otherwise specified by
DETO.
Suggested-and-reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/libata.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h index aa8583655a18..80c2bd202367 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -522,7 +522,8 @@ enum ata_lpm_policy { ATA_LPM_MAX_POWER, ATA_LPM_MED_POWER, ATA_LPM_MED_POWER_WITH_DIPM, /* Med power + DIPM as win IRST does */ - ATA_LPM_MIN_POWER, + ATA_LPM_MIN_POWER_WITH_PARTIAL, /* Min Power + partial and slumber */ + ATA_LPM_MIN_POWER, /* Min power + no partial (slumber only) */ }; enum ata_lpm_hints { |