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Date: Thu, 18 Feb 2016 11:52:24 +0530 From: Viresh Kumar <viresh.kumar@...aro.org> To: Krzysztof Kozlowski <k.kozlowski@...sung.com> Cc: Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, Lukasz Majewski <l.majewski@...sung.com>, Zhang Rui <rui.zhang@...el.com>, Eduardo Valentin <edubezval@...il.com> Subject: Re: [PATCH v2 3/3] ARM: dts: Don't overheat the Odroid XU3-Lite on high load 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 <k.kozlowski@...sung.com> > > --- > > 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.kumar@...aro.org> -- viresh
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