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>

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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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5

drivers/ata/libahci.c

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1

drivers/ata/libata-core.c

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1

drivers/ata/libata-scsi.c

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3

include/linux/libata.h

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