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f93bba30d7
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>
(cherry picked from commit
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