From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Hilman Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8) Date: Thu, 27 May 2010 16:42:15 -0700 Message-ID: <87fx1cgbe0.fsf@deeprootsystems.com> References: <20100527174019.GA3187@srcf.ucam.org> <1274982447.27810.5684.camel@twins> <201005280041.43553.rjw@sisk.pl> <20100528001514.28e593ef@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mail-px0-f174.google.com ([209.85.212.174]:56928 "EHLO mail-px0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758379Ab0E0XmS (ORCPT ); Thu, 27 May 2010 19:42:18 -0400 In-Reply-To: <20100528001514.28e593ef@lxorguk.ukuu.org.uk> (Alan Cox's message of "Fri\, 28 May 2010 00\:15\:14 +0100") Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Alan Cox Cc: "Rafael J. Wysocki" , Mickler , Peter Zijlstra , Dmitry Torokhov , LKML , Florian@smtp1.linux-foundation.org, Linux@smtp1.linux-foundation.org, Thomas Gleixner , List , Linux PM , felipe.balbi@nokia.com Alan Cox 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