From mboxrd@z Thu Jan  1 00:00:00 1970
From: marek.vasut@gmail.com (Marek Vasut)
Date: Fri, 11 Mar 2011 23:08:58 +0100
Subject: [PATCH 5/8] ARM: PXA: Z2: Add poweroff function
In-Reply-To: <201103112353.11261.anarsoul@gmail.com>
References: <1299839023-16601-1-git-send-email-anarsoul@gmail.com>
	<201103112239.03751.marek.vasut@gmail.com>
	<201103112353.11261.anarsoul@gmail.com>
Message-ID: <201103112308.59017.marek.vasut@gmail.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Friday 11 March 2011 22:53:11 Vasily Khoruzhick wrote:
> On Friday 11 March 2011 23:39:03 Marek Vasut wrote:
> > On Friday 11 March 2011 11:23:40 Vasily Khoruzhick wrote:
> > > Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
> > 
> > This looks bogus to me as you cannot power down the thing. Besides, where
> > do you resume to from this so-called "powerdown" ? Since the bootloader
> > will consider it as a legitimate deepsleep resume.
> 
> It eats only 0.7mA in deepsleep, but 6.7mA in sleep (PXA2xx has 2 sleep
> modes), so deepsleep is pretty close to poweroff.

So the power to the CPU is actually cut? It isn't, right ?

> Bootloader behaves
> correctly (at least u-boot binary I'm using)

Mine (I use mainline uboot) doesn't.

> - it starts boot process
> after deepsleep. Looks like hardware is somehow configured to disable
> almost everything in deepsleep mode, RAM content is not preserved anyway,
> so we can't resume properly.

PSPR is preserved though, right ? So you end up in a really deep crap I guess ?