Re: [PATCH 0/3] ata port runtime power management support

Tejun Heo
2011-11-02T15:17:11Z

Hello,

On Wed, Nov 02, 2011 at 02:21:37PM +0800, Lin Ming wrote:
> These 3 patches add ata port runtime pm support, which is done through scsi layer.
> scsi host runtime pm mechanism is already there(scsi_pm.c).
> These patches add hooks for ata port.
>
> Lin Ming (3):
> scsi: fix potential dead lock for host runtime pm
> scsi: add hooks for host runtime power management
> ata: implement ata port runtime pm hooks

Hmmm.... Some questions.

* How much does this add on top of hardware timed auto spindown and
dynamic link power management?

* Do the added benefits justify yet another runtime powersaving
mechanism?

* Any way we can tie the other stuff with overall runtime PM?

Thanks.

--
tejun