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ata: ahci: Support state with min power but Partial low power state

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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>
This commit is contained in:
Srinivas Pandruvada 2018-07-27 13:47:02 -07:00 • committed by Tejun Heo
parent 04ba948819
commit a5ec5a7bfd
4 changed files with 8 additions and 2 deletions
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3
include/linux/libata.h
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@ -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 {