On 13/09/2013 13:00, Andrew Lunn wrote:

On Fri, Sep 13, 2013 at 12:06:29PM +0200, Gregory CLEMENT wrote:

quoted

Hello,

This patch set adds the CPU idle support for Armada XP and prepares
the support for Armada 370. This was based on the work of Nadav
Haklai.

Hi Gregory.

Kirkwood has the ability to put the DDR into self refresh mode, which
is used as part of the second level idle mode. Does 370/XP have this?

Indeed there is a self refresh bit on a DDR related register. I thought
this kind of feature is more likely used for suspend to ram.

We plan to also submit the suspend to ram but not immediately.

For XP, with it being SMP, it would be a bit more complex, since you
would not want to use it unless all CPUs were idle.

I wonder how the others SMP ARM SoCs deal with it, I hope this time
there will be a framework available and we won't have to create it! ;)

      Thanks
	Andrew

-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com