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| author |   Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2018-07-27 13:47:02 -0700 |
|---|---|---|
| committer |   Tejun Heo <tj@kernel.org> | 2018-07-30 07:09:10 -0700 |
| commit | a5ec5a7bfd1f28d1905499641c9f589be36808c1 (patch) | |
| tree | 592320d7a604f9ca492a29a293983231bbe19a1b /drivers/ata/libata-core.c | |
| parent | Revert "ata: ahci_platform: convert kcalloc to devm_kcalloc" (diff) | |
| download | linux-dev-a5ec5a7bfd1f28d1905499641c9f589be36808c1.tar.xz linux-dev-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 'drivers/ata/libata-core.c')
| -rw-r--r-- | drivers/ata/libata-core.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 1e28d054851f..f1b1be17383b 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -3967,6 +3967,7 @@ int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy, scontrol |= (0x6 << 8); break; case ATA_LPM_MED_POWER_WITH_DIPM: + case ATA_LPM_MIN_POWER_WITH_PARTIAL: case ATA_LPM_MIN_POWER: if (ata_link_nr_enabled(link) > 0) /* no restrictions on LPM transitions */ |