[PATCH v2 2/2] socfpga: support suspend to ram

atull
2014-10-07T14:17:34Z

On Tue, 7 Oct 2014, Pavel Machek wrote:

> Hi!
>
> > From: Alan Tull <atull@opensource.altera.com>
> >
> > Add code that requests that the sdr controller go into
> > self-refresh mode. This code is run from ocram.
> >
> > This patch assumes that u-boot has already configured sdr:
> > sdr.ctrlcfg.lowpwreq.selfrfshmask = 3
> > sdr.ctrlcfg.lowpwrtiming.clkdisablecycles = 8
> > sdr.ctrlcfg.dramtiming4.selfrfshexit = 512
> >
> > How to suspend to ram:
> > $ echo enabled > \
> > /sys/devices/soc/ffc02000.serial0/tty/ttyS0/power/wakeup
> >
> > $ echo -n mem > /sys/power/state
> >
> > Signed-off-by: Alan Tull <atull@opensource.altera.com>
>
> > +static int __init socfpga_pm_init(void)
> > +{
> > + if (socfpga_setup_ocram_self_refresh())
> > + return -EFAULT;
>
> It would be nice to propagate the error result here.

Hi Pavel,

Yes, good catch.

Thanks,
Alan

>
> Best regards,
> Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
>