Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754099AbYHSHit (ORCPT ); Tue, 19 Aug 2008 03:38:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752579AbYHSHil (ORCPT ); Tue, 19 Aug 2008 03:38:41 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:33731 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752546AbYHSHik (ORCPT ); Tue, 19 Aug 2008 03:38:40 -0400 Date: Tue, 19 Aug 2008 09:38:39 +0200 From: Pavel Machek To: Alan Stern Cc: kernel list , Linux-pm mailing list , James.Bottomley@HansenPartnership.com, teheo@novell.com, oneukum@suse.de Subject: Re: Power management for SCSI Message-ID: <20080819073839.GA8726@atrey.karlin.mff.cuni.cz> References: <20080813095055.GA475@elf.ucw.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1412 Lines: 33 Hi! > > 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. Would it make sense to split the patches into "autosuspend for SCSI devices" and "autosuspend for SCSI controllers" for easier review/merge? I guess I'll start with the devices, they seem easier... Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/