From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viresh Kumar Subject: Re: [PATCH v2 3/3] ARM: dts: Don't overheat the Odroid XU3-Lite on high load Date: Thu, 18 Feb 2016 11:52:24 +0530 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 Return-path: Content-Disposition: inline In-Reply-To: <1455772383-20598-3-git-send-email-k.kozlowski-Sze3O3UU22JBDgjK7y7TUQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Krzysztof Kozlowski Cc: Kukjin Kim , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-samsung-soc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Lukasz Majewski , Zhang Rui , Eduardo Valentin List-Id: devicetree@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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html