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

Viresh Kumar
2016-02-18T06:22:24Z

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@samsung.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@linaro.org>

--
viresh