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authorSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>2018-07-27 13:47:02 -0700
committerTejun Heo <tj@kernel.org>2018-07-30 07:09:10 -0700
commita5ec5a7bfd1f28d1905499641c9f589be36808c1 (patch)
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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>
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