Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

Kevin Hilman
2010-05-27T23:42:22Z

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:

> - Given a non forced (that is 'idle down') transition to a suspend level
> we can implement a 'suspend as idle' on many embedded platforms in a
> manner which is not racy at kernel level. Apparently implemented
> already on ARM

Just to confirm, yes, it is already implemeted on ARM, and in mainline
for the TI OMAP3 (ARM Cortex-A8) and in commercial products (Nokia
N900, Moto Droid, Palm Pre, Archos, etc.) For the OMAP the deepest
C-state is actually a fully powered-down ARM core.

While the Droid uses 'suspend as idle' in addition to opportunistic
suspend, the N900 *never* suspends in the traditional sense, it is
entirely idle based.

Kevin