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

[MyungJoo Ham]

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
registers.

>
>     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.

Correct.

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