linux-kernel - Re: [PATCH] ata: ahci: power off unused ports

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Message-ID: <48443EB3.8020303@garzik.org>
Date:	Mon, 02 Jun 2008 14:40:51 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	rwheeler@...hat.com
CC:	kristen.c.accardi@...el.com, Mark Lord <liml@....ca>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@....cz>, Theodore Tso <tytso@....edu>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: ahci: power off unused ports

Ric Wheeler wrote:
> Kristen Carlson Accardi wrote:
>> Not all drivers will need a user interface to turn off hotplug
>> I would think.  At any rate - I would think it'd be better to let
>> driver writers decide how they want their drivers to behave wrt
>> hotplug and power instead of forcing a generic policy on everyone.
>>
>> This patch would provide users of AHCI controllers a way to save
>> power now, while you work on the grand scheme for polling/turning on off
>> hotplug via sysfs.  It's an interim solution that impacts nobody but
>> ahci users and is can be easily integrated into whatever solution you
>> eventually work out.

> I like the patch -  it seems that it will help a lot of users out near 
> term in a very positive way while we iterate on the broader solution,

A better patch would enable the _possibility_ of power savings on 
non-AHCI chips, and not add a one-off AHCI-specific user interface that 
must be supported for years to come.

	Jeff


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