linux-kernel - Re: [PATCH v2 3/3] ARM: dts: Don't overheat the Odroid XU3-Lite on high load

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Message-ID: <20160218062224.GU2610@vireshk-i7>
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