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

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Message-ID: <87fx1cgbe0.fsf@deeprootsystems.com>
Date:	Thu, 27 May 2010 16:42:15 -0700
From:	Kevin Hilman <khilman@...prootsystems.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Mickler <florian@...kler.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian@...p1.linux-foundation.org,
	Linux@...p1.linux-foundation.org,
	Thomas Gleixner <tglx@...utronix.de>,
	List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	felipe.balbi@...ia.com
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

Alan Cox <alan@...rguk.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
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