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3467ea905b
Popular bpi-r3 pwm fans like this one https://www.amazon.com/youyeetoo-Barebone-Fan-BPI-R3-Integrated/dp/B0CCCTY8PS will not work properly with current openwrt-23.05/24.10 firmware. Trying different pwm setting echo $value > /sys/devices/platform/pwm-fan/hwmon/hwmon1/pwm1 I found: pwm1 value fan rotation speed cpu temperature notes ----------------------------------------------------------------- 0 maximal 31.5 Celsius too noisy 40 optimal 35.2 Celsius no noise hearable 95 minimal above 95 does not rotate 55.5 Celsius ----------------------------------------------------------------- At the moment we have following cooling levels: cooling-levels = <255 96 0>; for cpu-active-high, cpu-active-medium and cpu-active-low modes correspondingly. Thus only cpu-active-high and cpu-active-low are usable. I think this is wrong. This patch fixes cpu-active-medium settings for bpi-r3 board. PS: I know, the patch is not ideal as it can break pwm fan for some users. There are some peoples that use handmade cooling solutions, but: * discussed cooler is the only 'official' pwm cooler for bpi-r3 available on the market. * most peoples will use passive cooling available on the market or the discussed cooler. * the pwm-fan dts section was added before the official cooler appears on the market. Thus it should not be a lot of harm from this fix. Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@gmail.com> Link: https://github.com/openwrt/openwrt/pull/16974 Signed-off-by: Robert Marko <robimarko@gmail.com> |
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