Re: [PATCH 0/3] ata port runtime power management support
From: Tejun Heo
Date: Wed Nov 02 2011 - 11:17:07 EST
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
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