From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1425288AbcBRGWl (ORCPT ); Thu, 18 Feb 2016 01:22:41 -0500 Received: from mail-pa0-f44.google.com ([209.85.220.44]:36233 "EHLO mail-pa0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1425273AbcBRGWh (ORCPT ); Thu, 18 Feb 2016 01:22:37 -0500 Date: Thu, 18 Feb 2016 11:52:24 +0530 From: Viresh Kumar To: Krzysztof Kozlowski Cc: Kukjin Kim , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Lukasz Majewski , Zhang Rui , Eduardo Valentin Subject: Re: [PATCH v2 3/3] ARM: dts: Don't overheat the Odroid XU3-Lite on high load Message-ID: <20160218062224.GU2610@vireshk-i7> References: <1455772383-20598-1-git-send-email-k.kozlowski@samsung.com> <1455772383-20598-3-git-send-email-k.kozlowski@samsung.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1455772383-20598-3-git-send-email-k.kozlowski@samsung.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18-02-16, 14:13, Krzysztof Kozlowski wrote: > After adding cpufreq-dt support to Exynos542x, the Odroid XU3-Lite can > be easily overheated when launching eight CPU-intensive tasks: > thermal thermal_zone3: critical temperature reached(121 C),shutting down > > This seems to be specific to Odroid XU3-Lite board which officially > supports lower frequencies than regular XU3 or XU4. When working at > maximum CPU speed (1800 MHz big and 1300 MHz LITTLE) in warmer place for > longer time, the fan fails to cool down the board and it reaches > critical temperature. > > Add CPU cooling to Exynos5422/5800 to fix this issue. When reaching last > interrupt-driven trip-point (70 degrees of Celsius) start passive > cooling in polling mode (slowing CPU by 2 steps). When reaching 85 > degrees of Celsius, start slowing even more, down to 600 MHz. > > Signed-off-by: Krzysztof Kozlowski > > --- > > Changes since v1: > 1. Use polling mode for passive cooling (number of configurable trip > points in TMU exceeded). > > 2. Adjust the values (temperature and cooling levels). > --- > arch/arm/boot/dts/exynos5422-cpu-thermal.dtsi | 46 ++++++++++++++++++++++++++- > 1 file changed, 45 insertions(+), 1 deletion(-) Acked-by: Viresh Kumar -- viresh