[linux-pm] [TuxOnIce-devel] [RFC PATCH] Current status, suspend-to-disk support on ARM

MyungJoo Ham myungjoo.ham at gmail.com
Thu Apr 21 00:55:58 EDT 2011

Hello Matt,

On Wed, Apr 20, 2011 at 4:14 PM, Matt Hsu <matt at 0xlab.org> wrote:
>> Also, I'd like to investigate whether ARM will require a set of
>> platform_hibernation_ops - Samsung's patch from last December,
>> http://www.spinics.net/lists/arm-kernel/msg108565.html
>     Hi FrankH,
>      The patch seems has connection with this
>      www.kernel.org/doc/ols/2010/ols2010-pages-9-18.pdf

Actually, those patches had no direct connections with that anyway. :)

>     You can see the section 4.3 fast device reactivation.
>     It does the similar thing  as STR, but drivers status are kept in
> hibernation image instead of main memory.
>     I guess this is why this patch comes out.

Yes, this SoC has registers that require STR/Hibernation to save the
status. They include power, clock, memory-control, gpio, uart related

>     In the current device driver model, there are no appropriate handling
> specific to
>     hibernation_suspend/hibernation_resume ops.
>     So they make their own interface/platform drivers.


If the interface looks like dev_pm_ops, it would be virtually perfect. :)

>> seems to indicate that they believe it's necessary at least on some ARM
>> hardware. OMAP has similar functions to that, it'd be great to unify.
>> FrankH.
> --
> - Matt
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MyungJoo Ham, Ph.D.
Mobile Software Platform Lab,
Digital Media and Communications (DMC) Business
Samsung Electronics
cell: 82-10-6714-2858

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