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

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Message-ID: <466EBF91.8060508@gmail.com>
Date:	Wed, 13 Jun 2007 00:45:21 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Jeff Garzik <jeff@...zik.org>,
	Dagfinn Ilmari Mannsåker 
	<ilmari@...ari.org>,
	Kristen Carlson Accardi <kristen.c.accardi@...el.com>,
	james.bottomley@...eleye.com, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/3] Enable Aggressive Link Power management for AHCI
 controllers.

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.

Does the spec mandate that the ACPI interrupt shouldn't depend on SATA
phy status?  I don't think vendors are likely to implement separate
mechanism when SATA phy status can do the job fine.

-- 
tejun
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