Message-ID: <431944C8.5070205@pobox.com>
Date: Sat, 03 Sep 2005 02:38:00 -0400
From: Jeff Garzik <jgarzik@pobox.com>
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To: lkosewsk@gmail.com
CC: Ravi Wijayaratne <ravi_wija@yahoo.com>, linux-kernel@vger.kernel.org
Subject: Re: Hotswap support for libata
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Lukasz Kosewski wrote:
> On a happier note, once the infrastructure is accepted, anyone with a
> hotswap-unsupported controller and some time on their hands will
> easily be able to integrate hotswap in; that is the whole goal of an
> infrastructure.  So if your controller isn't supported, but you know
> something about it (or better yet, you yourself have docs), adding
> hotswap support to it should be too hard.

Once the infrastructure is there, I'll probably add support for several 
controllers myself.  Many controllers don't have an explicit hotplug 
interrupt, but rather we must examine the PhyRdy bit in the standard 
SError register for details.  If the bit's state changes in any way 
(including two or more state changes), we (a) check for device presence, 
and (b) if device is present, initialize it (SET FEATURES - XFER MODE, 
etc.).

	Jeff


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