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author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2018-07-27 13:47:02 -0700 |
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committer | Tejun Heo <tj@kernel.org> | 2018-07-30 07:09:10 -0700 |
commit | a5ec5a7bfd1f28d1905499641c9f589be36808c1 (patch) | |
tree | 592320d7a604f9ca492a29a293983231bbe19a1b /drivers/ata/libata-scsi.c | |
parent | 04ba9488199e3ee9971769cee585ec6847013ed2 (diff) | |
download | linux-stable-a5ec5a7bfd1f28d1905499641c9f589be36808c1.tar.gz linux-stable-a5ec5a7bfd1f28d1905499641c9f589be36808c1.tar.bz2 linux-stable-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-scsi.c')
-rw-r--r-- | drivers/ata/libata-scsi.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 980190c9eb48..63c25f1499c3 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -110,6 +110,7 @@ static const char *ata_lpm_policy_names[] = { [ATA_LPM_MAX_POWER] = "max_performance", [ATA_LPM_MED_POWER] = "medium_power", [ATA_LPM_MED_POWER_WITH_DIPM] = "med_power_with_dipm", + [ATA_LPM_MIN_POWER_WITH_PARTIAL] = "min_power_with_partial", [ATA_LPM_MIN_POWER] = "min_power", }; |