diff options
| author | Mikhail Kshevetskiy | 2024-11-15 00:17:07 +0000 |
|---|---|---|
| committer | Robert Marko | 2024-11-21 21:04:14 +0000 |
| commit | 3467ea905b40f0df87700a15b716b1f5a4efc955 (patch) | |
| tree | 5978a7d447a50059c5309b925b303d051496e05d | |
| parent | 2784f78c6c22c0731ef551e4fcd42295f08a07a5 (diff) | |
| download | openwrt-3467ea905b40f0df87700a15b716b1f5a4efc955.tar.gz | |
mediatek: fix pwn fan settings for sinovoip bpi-r3
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>
| -rw-r--r-- | target/linux/mediatek/patches-5.15/196-dts-mt7986a-bpi-r3-pwm-fan-cooling-levels.patch | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches-5.15/196-dts-mt7986a-bpi-r3-pwm-fan-cooling-levels.patch b/target/linux/mediatek/patches-5.15/196-dts-mt7986a-bpi-r3-pwm-fan-cooling-levels.patch new file mode 100644 index 0000000000..267c654f35 --- /dev/null +++ b/target/linux/mediatek/patches-5.15/196-dts-mt7986a-bpi-r3-pwm-fan-cooling-levels.patch @@ -0,0 +1,11 @@ +--- a/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts ++++ b/arch/arm64/boot/dts/mediatek/mt7986a-bananapi-bpi-r3.dts +@@ -46,7 +46,7 @@ + compatible = "pwm-fan"; + #cooling-cells = <2>; + /* cooling level (0, 1, 2) - pwm inverted */ +- cooling-levels = <255 96 0>; ++ cooling-levels = <255 40 0>; + pwms = <&pwm 0 10000>; + status = "okay"; + }; |