[PATCH 5/8] ARM: PXA: Z2: Add poweroff function

[Marek Vasut]

On Friday 11 March 2011 23:12:40 Vasily Khoruzhick wrote:
> On Saturday 12 March 2011 00:08:58 Marek Vasut wrote:
> > 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 at 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 ?
> 
> It isn't. But looks like power to memory is cut. But stock bootloader puts
> it in deepsleep to save battery.

Power to memory is cut? How come? You mean rather the refresh is disabled, right 
? But anyway, isn't the ram put into self-refresh ?
> 
> > Mine (I use mainline uboot) doesn't.
> 
> Can you re-check it?

Check what ? Yes I can ...
> 
> > PSPR is preserved though, right ? So you end up in a really deep crap I
> > guess ?
> 
> Does u-boot check if PSPR is null?

No, it doesn't. But it checks if the device was woken-up or power-on reseted.
> 
> Regards
> Vasily