Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755966AbaGNPlh (ORCPT ); Mon, 14 Jul 2014 11:41:37 -0400 Received: from mail-wi0-f174.google.com ([209.85.212.174]:37718 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755823AbaGNPl2 (ORCPT ); Mon, 14 Jul 2014 11:41:28 -0400 MIME-Version: 1.0 In-Reply-To: <1404926274-18411-1-git-send-email-b.zolnierkie@samsung.com> References: <1404926274-18411-1-git-send-email-b.zolnierkie@samsung.com> Date: Mon, 14 Jul 2014 16:41:25 +0100 Message-ID: Subject: Re: [PATCH v3 0/4] ARM: EXYNOS: cpuidle: fix AFTR mode on boards with secure firmware enabled From: Daniel Drake To: Bartlomiej Zolnierkiewicz Cc: Kukjin Kim , Daniel Lezcano , Tomasz Figa , Sachin Kamat , Viresh Kumar , "Rafael J. Wysocki" , Kyungmin Park , linux-samsung-soc , linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linaro-kernel@lists.linaro.org Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Bartlomiej, On Wed, Jul 9, 2014 at 6:17 PM, Bartlomiej Zolnierkiewicz wrote: > This patch series adds support for AFTR idle mode on boards with > secure firmware enabled and allows EXYNOS cpuidle driver usage on > Exynos4x12 SoCs. > > It has been tested on Trats2 board (using Exynos4412 SoC with secure > firmware enabled) on which AFTR mode reduces power consumption by ~12% > when EXYNOS cpuidle driver is enabled (in both cases the default > exynos_defconfig config is used and CPU1-3 are offlined). Thanks for this, I have tested it on ODROID-U2. I don't have any equipment to measure the power usage, but after offlining CPUs 1,2,3 via sysfs "online" file, a printk I added confirms that the system is going to enter aftr mode, and system stability seems as good as ever. Is there any automatic way that the cpus should be offlined, or is the intention that it must be done "by hand" like this? Thanks, Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/