linux-kernel - Re: [PATCH v2 2/2] socfpga: support suspend to ram

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Date:	Tue, 7 Oct 2014 13:17:15 +0200
From:	Pavel Machek <pavel@...x.de>
To:	atull@...nsource.altera.com
Cc:	dinguyen@...nsource.altera.com, linux@....linux.org.uk,
	yvanderv@...nsource.altera.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, delicious.quinoa@...il.com
Subject: Re: [PATCH v2 2/2] socfpga: support suspend to ram

Hi!

> From: Alan Tull <atull@...nsource.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@...nsource.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
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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