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

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Date:	Tue, 27 May 2008 14:32:02 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Theodore Tso <tytso@....edu>
Cc:	jeff@...zik.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: ahci: power off unused ports

On Mon, 26 May 2008 23:08:54 -0400
Theodore Tso <tytso@....edu> wrote:

> On Thu, May 08, 2008 at 04:10:08PM -0700, Kristen Carlson Accardi wrote:
> > power off unused ports
> > 
> > If the port isn't either a drive bay or an external SATA port, do not 
> > keep the phy powered on if the port is unoccupied. This saves .75 watts
> > on most laptops.  A module parameter can be used to override this 
> > behavior and allow the phy's to be powered up regardless of whether it
> > has externally accessible SATA ports. 
> > 
> > Signed-off-by:  Kristen Carlson Accardi <kristen.c.accardi@...el.com>
> 
> Hi,
> 
> I'm wondering what's the status of this patch?  
> 
> if this has hit a subsystem tree yet?  0.75 watts power savings sounds
> really cool, but it doesn't seem to be in Linus's mainline yet.  Has
> it hit a subsystem tree yet, or is there some issue that still needs
> to be resolved before it can go it?
> 
> Thanks, regards,
> 
> 							- Ted
> 

Hi Ted,
As far as I know the patch has gone nowhere.  I believe that 
Jeff wanted something more flexible than the module parameter that
I provided to override the BIOS options.  I am not working on this,
I figured he had a pretty firm idea what he wanted so he was better
equipped to write the patch.

Kristen
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