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Date: Thu, 25 Sep 2014 10:25:06 +0200 From: Steffen Trumtrar <s.trumtrar@...gutronix.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 2/2] socfpga: support suspend to ram Hi! On Wed, Sep 24, 2014 at 03:27:29PM -0500, atull@...nsource.altera.com wrote: > 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 > (...) Never looked into that, so maybe a stupid question: What happens if the bootloader (u-boot or other) didn't configure the sdr? Will it "just" not wake up again? Regards, Steffen -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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