linux-kernel - Re: [PATCH 0/7] Runtime PM support for AHCI host controller driver

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Date:	Fri, 19 Feb 2016 10:54:11 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	linux-block@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH 0/7] Runtime PM support for AHCI host controller driver

On Thu, Feb 18, 2016 at 10:54:10AM +0200, Mika Westerberg wrote:
> Linux already supports runtime PM of disks (drivers/scsi/sd.c) so that
> after certain amount of idle time the disk is suspended automatically. This
> series extends the support to AHCI host controllers. Whenever SATA ports
> are determined to be idle (all children are runtime suspended) the host
> controller is also suspended.
> 
> On recent Intel CPUs like Broxton this allows the CPU to go low power idle
> states like S0ix runtime (given that all necessary blocks are also in their
> correesponding low power states).
> 
> Patches [1-2/7] fix a lockup where disk is runtime suspended and the system
> is put to sleep. They are independent of the rest of the series.
> 
> Patch [3/7] makes it possible for SATA ports to be runtime suspended when
> there is not disk connected. For example on Lenovo Yoga 900 there are two
> SATA ports which only one of them has disk connected. This patch allows the
> host controller to runtime suspend whenever the disk is idle.

Applied to libata/for-4.6.

Thanks.

-- 
tejun