netdev - Re: smsc911x suspend/resume

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Date:	Sun, 14 Feb 2010 11:01:43 +0200
From:	mike@...pulab.co.il
To:	Steve.Glendinning@...c.com
Cc:	Daniel Mack <daniel@...aq.de>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	linux-arm-kernel-bounces@...ts.infradead.org,
	netdev@...r.kernel.org, Ian.Saturley@...c.com
Subject: Re: smsc911x suspend/resume

On Thu, Feb 11, 2010 at 06:26:32PM +0000, Steve.Glendinning@...c.com wrote:
> > Hmm, be careful about switching off power supplies that aren't supposed
> > to be switched off while others are still powered. You can easily
> > destroy hardware with that. Depending on how things are wired up
> > internally, voltages can leak from one unit block to the other. Maybe
> > Steve can can give a statement from official SMSC source about whether
> > it is safe to switch off VDD33A in this case.
> 
> I've checked with the chip architects, no power planes should be 
> externally
> switched off in any suspend mode.

The question if they *can* be switched off. With the hardware I have,
most of 3.3V supplies are enabled/disabled with the same control. So, to
have maximal power saving in the system, I just pull this control to
disable 3.3V supplies, VDD33A among them. If smsc9220 can tolerate
switching VDD33A during suspend, I can send a patch that allows proper
wake-up with such conditions.

> Steve
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