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Message-ID: <20100214090143.GA23498@gentoodev.compulab.local> 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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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