From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756425AbcBRFOa (ORCPT ); Thu, 18 Feb 2016 00:14:30 -0500 Received: from mailout1.w1.samsung.com ([210.118.77.11]:29908 "EHLO mailout1.w1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932702AbcBRFN1 (ORCPT ); Thu, 18 Feb 2016 00:13:27 -0500 X-AuditID: cbfec7f4-f79026d00000418a-04-56c552f49045 From: Krzysztof Kozlowski To: Kukjin Kim , Krzysztof Kozlowski , 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 Cc: Lukasz Majewski , Zhang Rui , Eduardo Valentin , Viresh Kumar Subject: [PATCH v2 3/3] ARM: dts: Don't overheat the Odroid XU3-Lite on high load Date: Thu, 18 Feb 2016 14:13:03 +0900 Message-id: <1455772383-20598-3-git-send-email-k.kozlowski@samsung.com> X-Mailer: git-send-email 2.5.0 In-reply-to: <1455772383-20598-1-git-send-email-k.kozlowski@samsung.com> References: <1455772383-20598-1-git-send-email-k.kozlowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrALMWRmVeSWpSXmKPExsVy+t/xa7pfgo6GGbSt4bSYf+Qcq8X8K9dY LV6/MLTof/ya2eLNw82MFpseA4Uu75rDZvG59wijxYzz+5gsnjzsY7PY+NXDgdtj56y77B6L 97xk8ti0qpPN4861PWwem5fUe/RtWcXo8XmTXAB7FJdNSmpOZllqkb5dAlfG9r4TzAUfJSqm bPjB2sC4SaiLkZNDQsBEYnfjbnYIW0ziwr31bF2MXBxCAksZJW4vfgbl/GeU2LX8AhNIFZuA scTm5UvAEiICnxklLn6dwgLiMAvMZ5SY8GQxI0iVsECwxJKmv6wgNouAqsTHZzvYQGxeAXeJ hXc+MXcxcgDtk5NYcCEdJMwp4CEx+cd/ZhBbCKjk1YqXbBMYeRcwMqxiFE0tTS4oTkrPNdQr TswtLs1L10vOz93ECAnHLzsYFx+zOsQowMGoxMPL8fpImBBrYllxZe4hRgkOZiUR3m/uR8OE eFMSK6tSi/Lji0pzUosPMUpzsCiJ887d9T5ESCA9sSQ1OzW1ILUIJsvEwSnVwCi5y7vJ50Na qwzr5zWfTBinvlQ/nmpUsHHOWVHvm3bmx5oUSxfyzO5emHAzYOeHM+3q0xavPnBn6zuDiX/a eHuld2udmHflA2/2ovsJvdoVi08ZnLp7sHaj9g63lOhKq8KqZ9ejEq+en3Q3ZeLy/tTXbW1L /75lvsBzrSIsI+/Qpx+bPy/c6WmmxFKckWioxVxUnAgAIR2hY0MCAAA= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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(-) diff --git a/arch/arm/boot/dts/exynos5422-cpu-thermal.dtsi b/arch/arm/boot/dts/exynos5422-cpu-thermal.dtsi index 2b289d7c0d13..3e4c4ad96d63 100644 --- a/arch/arm/boot/dts/exynos5422-cpu-thermal.dtsi +++ b/arch/arm/boot/dts/exynos5422-cpu-thermal.dtsi @@ -16,7 +16,7 @@ thermal-zones { cpu0_thermal: cpu0-thermal { thermal-sensors = <&tmu_cpu0 0>; - polling-delay-passive = <0>; + polling-delay-passive = <250>; polling-delay = <0>; trips { cpu_alert0: cpu-alert-0 { @@ -39,6 +39,23 @@ hysteresis = <0>; /* millicelsius */ type = "critical"; }; + /* + * Exyunos542x support only 4 trip-points + * so for these polling mode is required. + * Start polling at temperature level of last + * interrupt-driven trip: cpu_alert2 + */ + cpu_alert3: cpu-alert-3 { + temperature = <70000>; /* millicelsius */ + hysteresis = <10000>; /* millicelsius */ + type = "passive"; + }; + cpu_alert4: cpu-alert-4 { + temperature = <85000>; /* millicelsius */ + hysteresis = <10000>; /* millicelsius */ + type = "passive"; + }; + }; cooling-maps { map0 { @@ -53,6 +70,33 @@ trip = <&cpu_alert2>; cooling-device = <&fan0 2 3>; }; + /* + * When reaching cpu_alert3, reduce CPU + * by 2 steps. On Exynos5422/5800 that would + * be: 1500 MHz and 1100 MHz. + */ + map3 { + trip = <&cpu_alert3>; + cooling-device = <&cpu0 0 2>; + }; + map4 { + trip = <&cpu_alert3>; + cooling-device = <&cpu4 0 2>; + }; + + /* + * When reaching cpu_alert4, reduce CPU + * further, down to 600 MHz (11 steps for big, + * 7 steps for LITTLE). + */ + map5 { + trip = <&cpu_alert4>; + cooling-device = <&cpu0 3 7>; + }; + map6 { + trip = <&cpu_alert4>; + cooling-device = <&cpu4 3 11>; + }; }; }; }; -- 2.5.0