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([2a01:e34:ed2f:f020:e537:d458:d3c4:18e1]) by smtp.googlemail.com with ESMTPSA id v15sm5701683wrw.24.2021.06.11.00.45.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Jun 2021 00:45:52 -0700 (PDT) Subject: Re: [PATCH] arm64: dts: meson: vim3: reduce cpu thermal fan trigger temperature To: Nick Xie , Neil Armstrong Cc: robh+dt@kernel.org, khilman@baylibre.com, jbrunet@baylibre.com, martin.blumenstingl@googlemail.com, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, Nick , artem@khadas.com References: <20210609012849.797576-1-xieqinick@gmail.com> <11da3ae4-91d4-1e51-c652-e4ad518f13bd@baylibre.com> From: Daniel Lezcano Message-ID: <09c65310-9441-9b97-d9ae-4695f0dd16af@linaro.org> Date: Fri, 11 Jun 2021 09:45:51 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/06/2021 09:30, Nick Xie wrote: > Hello Neil, > > > Neil Armstrong 于2021年6月11日周五 下午3:15写道： >> >> Hi, >> >> On 11/06/2021 08:54, Nick Xie wrote: >>> Hello Neil, >>> >>> The MCU FAN won't work until the temperature reach to 80 degree centigrade, >>> Do you think the temperature is too high? >> >> I think 80 is tool high, but I fear 50 is way too low, but if you think 50 is OK after you ran some tests, just add it to the commit log and it's ok for me. > > I think it is OK, we use it for a long time. 50°C sounds like normal temperature with regular load. That means the fan will be switched on most of the time when the board is used. And this change may be put in regard with the other trip points in the common DT. For instance, enable the fan when reaching 80°C but set the passive trip point to 75°C instead of 85°C. All that depends on the hardware characteristics and TDP which are in the TRM normally. -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog