linux-kernel - Re: [patch 3/3] Enable Aggressive Link Power management for AHCI controllers.

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Message-Id: <20070612092749.ff46bc32.kristen.c.accardi@intel.com>
Date:	Tue, 12 Jun 2007 09:27:49 -0700
From:	Kristen Carlson Accardi <kristen.c.accardi@...el.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Dagfinn Ilmari Mannsåker 
	<ilmari@...ari.org>, james.bottomley@...eleye.com,
	linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, htejun@...il.com
Subject: Re: [patch 3/3] Enable Aggressive Link Power management for AHCI
 controllers.

On Tue, 12 Jun 2007 11:46:56 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> Matthew Garrett wrote:
> > On Tue, Jun 12, 2007 at 11:17:14AM -0300, Henrique de Moraes Holschuh wrote:
> >> On Tue, 12 Jun 2007, Matthew Garrett wrote:
> >>> Laptop bays are designed to deal with hotplugging PATA - I don't think 
> >>> this is too much of an issue :)
> >> The new SATA ones use the SATA hardware hotplug ;-)   Just like the pci-e
> >> cards use usb2.0 and pci-e hotplug...
> > 
> > Yes, but they'll also send an ACPI interrupt even if the SATA host 
> > controller doesn't - it's part of the spec for bays.
> 
> Regardless, having a laptop does not imply having a docking bay.
> 
> 	Jeff
> 

For bay devices, we can use ACPI just like we do now.  For non-bay devices,
we can implement hotplug via polling when ALPM is enabled.  In my experience
most laptop vendors implement extra drive as either PATA in a dock station, 
USB in a dock station, or a bay device either on the dock station, or 
on the laptop itself.


Kristen
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