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

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Date:	Thu, 8 May 2008 17:28:59 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	jeff@...zik.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: ahci: power off unused ports

On Fri, 9 May 2008 01:14:58 +0100
Matthew Garrett <mjg59@...f.ucam.org> wrote:

> On Thu, May 08, 2008 at 04:35:55PM -0700, Kristen Carlson Accardi wrote:
> > On Fri, 9 May 2008 00:37:13 +0100
> > Matthew Garrett <mjg59@...f.ucam.org> wrote:
> > > Just out of interest, is this set on laptop bays? (Are any of those even 
> > > native SATA yet?)
> > 
> > I haven't seen any yet that are.  Most of them are PATA.  I expect
> > that will change in the future.
> 
> Yeah. My vague concern would be that on laptops, we can probably power 
> down the port even if it's declared as being hotplug capable - we'll 
> probably get an out of band signal from ACPI anyway. Not an issue at the 
> moment, but possibly something we'll hit in future.
> 

well - when drive bays on laptops are able to be controlled by
AHCI, they may not actually use _EJ0 or send notifications anymore, 
since ACPI will not longer be necessary for hotplugging.  We'll have 
to see what happens.
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