linux-kernel - Re: [patch 1/2] Enable link power management for ata drivers

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Message-ID: <472027BC.7010400@garzik.org>
Date:	Thu, 25 Oct 2007 01:21:00 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
CC:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...nel.dk, akpm@...ux-foundation.org,
	Tejun Heo <htejun@...il.com>
Subject: Re: [patch 1/2] Enable link power management for ata drivers

applied as the attached two patches to jgarzik/libata-dev.git#alpm

open issues:

1) need to check ata_dev_set_feature() return value in 
ata_dev_set_dipm() and do something useful with it

2) as the name implies, this probably better belongs in ata_link.

3) however, the feature is tightly coupled to the host controller.  in 
theory PMP -might- do this, but I think its unlikely.  as such I was OK 
with the present arrangement.

4) there has been some discussion of software-initiated device/link 
power management, but I think this should go in, in parallel with those 
discussions.  ALPM
	* is quite self-contained
	* gives a noticable power savings

I'm definitely interested in seeing somebody pursue software-initiated 
link PM as well...

	Jeff




View attachment "patch.1" of type "text/plain" (3467 bytes)

View attachment "patch.2" of type "text/plain" (16518 bytes)