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

Pavel Machek
2014-10-07T11:17:15Z

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.

Best regards,
Pavel
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