[linux-pm] ARM hibernation / suspend-to-disk

[Pavel Machek]

Hi!

> > what's the status of suspend-to-disk on ARM? The most recent discussion I
> > found is:
> > http://lists.linuxfoundation.org/pipermail/linux-pm/2012-November/034997.html
> > 
> > with no replies at all. Is anyone still working on that? Anyone got it running?
> > 
> > I tried the patch above (on top of LTS 3.4) and got stuck forever, the last
> > thing on the console was:
> > 
> > root at omap5:/sys/power# echo disk > state
> > [ 2015.641540] PM: Syncing filesystems ... done.
> > [ 2015.666870] PM: Preallocating image memory... done (allocated 16957 pages)
> > [ 2016.062011] PM: Allocated 67828 kbytes in 0.38 seconds (178.49 MB/s)
> > 
> > Any hint how to debug that?
> 
> Because of the nature of omap5 PM, you'd need omap5 specific support in
> order for this to work. Specifically, there are a number of assumptions
> about certain power domains never losing state. You can take a look at
> the work I did to get this working on am335x here:
> 
> https://github.com/russdill/linux/commits/arm-hibernation-am33xx
> 
> For ARM hibernation support to get merged, there needs to be at least
> one platform that supports it. the am335x code I have is not ready as it
> still relies on PM patchsets that have not yet themselves been merged.

Given that we have chicken-and-egg problem here, I believe it makes sense
to merge generic ARM hibernation support now.
								Pavel
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