Re: [PATCH] ata: ahci: power off unused ports

From: Kristen Carlson Accardi
Date: Tue May 27 2008 - 17:41:19 EST


On Mon, 26 May 2008 23:08:54 -0400
Theodore Tso <tytso@xxxxxxx> 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@xxxxxxxxx>
>
> 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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