ahci: Add runtime PM support for the host controller

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This patch adds runtime PM support for the AHCI host controller driver so
that the host controller is powered down when all SATA ports are runtime
suspended. Powering down the AHCI host controller can reduce power
consumption and possibly allow the CPU to enter lower power idle states
(S0ix) during runtime.

Runtime PM is blocked by default and needs to be unblocked from userspace
as needed (via power/* sysfs nodes).

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

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This commit is contained in:

Mika Westerberg 2016-02-18 10:54:17 +02:00 • committed by Tejun Heo

parent bb03c64069

commit 02e53293ea

1 changed files with 61 additions and 12 deletions

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73

drivers/ata/ahci.c

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