linux-kernel - Re: Power management for SCSI

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Message-ID: <Pine.LNX.4.44L0.0808131026320.2455-100000@iolanthe.rowland.org>
Date:	Wed, 13 Aug 2008 10:31:03 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pavel Machek <pavel@...e.cz>
cc:	kernel list <linux-kernel@...r.kernel.org>,
	Linux-pm mailing list <linux-pm@...ts.osdl.org>,
	<James.Bottomley@...senPartnership.com>, <teheo@...ell.com>,
	<oneukum@...e.de>
Subject: Re: Power management for SCSI

On Wed, 13 Aug 2008, Pavel Machek wrote:

> From: Alan Stern <stern@...land.harvard.edu>
> 
> Add support for autosuspend/autoresume. Lowlevel driver can use it to
> spin the disk down and power down its SATA link, to turn off the USB
> interface, etc.
> 
> Spinning down the disk is useful - saves ~0.5W here. Powering down
> SATA controller is even better -- should save ~1W.
> 
> Now, I guess the patch will need to be split to small pieces for
> merge... I tried to rearrange it so that the documentation and hooks
> go before stuff that needs the hooks, and before Kconfig enabler. If
> it looks reasonably good, I'll split it into smaller pieces.

James had a number of objections to my original patch; you can read 
them here:

https://lists.linux-foundation.org/pipermail/linux-pm/2008-March/016849.html

I haven't had time yet to work on an improved version.

Alan Stern

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