[PATCHv1] ARM: imx: Add support for low power suspend on MX51.

Nguyen Dinh-R00091 R00091 at freescale.com
Wed Mar 2 14:41:45 EST 2011

Hi Arnaud,

>-----Original Message-----
>From: linux-arm-kernel-bounces at lists.infradead.org [mailto:linux-arm-kernel-
>bounces at lists.infradead.org] On Behalf Of Arnaud Patard
>Sent: Wednesday, March 02, 2011 1:35 PM
>To: Nguyen Dinh-R00091
>Cc: linux at arm.linux.org.uk; s.hauer at pengutronix.de; linux-kernel at vger.kernel.org; u.kleine-
>koenig at pengutronix.de; Zhang Lily-R58066; linux-arm-kernel at lists.infradead.org
>Subject: Re: [PATCHv1] ARM: imx: Add support for low power suspend on MX51.
><Dinh.Nguyen at freescale.com> writes:
>> From: Dinh Nguyen <Dinh.Nguyen at freescale.com>
>> Adds initial low power suspend functionality to MX51.
>> Supports "mem" and "standby" modes.
>I've very quickly tried suspend to mem on my system and despite having set
>some irq as wakeup source, it doesn't wake up. Is there some extra step
>to be done in order to test your patch ?
>Moreover, the code I've seen for suspend is very different. It's seems
>to handle some cpufreq stuff and seems to be copying some code into some
>special ram. Is all this stuff unneeded ?

I am able to wakeup using gpio-key on my mx51-babbage system if I comment out the most of the drivers except for the gpio-keys driver. Yes, there are additional cpufreq and code that needs to get run in IRAM for mx51, which I will add on to this patch. This is just the initial patch to put the SoC in to suspend and have other developers add to it.



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