linux-kernel - [RFC][PATCH 4/4] ahci: support hot plug when port/controller is runtime suspended

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Date:	Thu, 15 Dec 2011 21:12:49 +0800
From:	Lin Ming <ming.m.lin@...el.com>
To:	Jeff Garzik <jgarzik@...ox.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: [RFC][PATCH 4/4] ahci: support hot plug when port/controller is runtime suspended

This is an empty patch now :)

I use eSATA to test disk hot plug.
With previous 3 patches applied, disk hot plug does not wok
when ahci port/controller is runtime suspended.

There are 2 cases we need to handle for hot plug:

1. port suspended, controller active
   Is IRQ need to be enabled for port to detect hot plug? 

2. port suspended, controller suspended
   Will controller get a PME when hot plug happens?

I'm still investigating hot plug support.

Anyone has comment?

Thanks,
Lin Ming
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