target/linux/bcm27xx/patches-5.10/950-0510-Make-rpi-poe-fan-less-noisy-in-cool-environments.patch

   1 From 6e4cd276213a20bc55146588b0ec2fc6b622a9d7 Mon Sep 17 00:00:00 2001
   2 From: ProBackup-nl <515451+ProBackup-nl@users.noreply.github.com>
   3 Date: Thu, 18 Mar 2021 18:21:43 +0100
   4 Subject: [PATCH] Make rpi poe fan less noisy in cool environments
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Run the PoE hat fan with reduced noise when possible. The PoE hat fan will spin even at PWM=1 and spins almost silent. Tested at 17ºC, the fan PWM alternates between 1 and 10, which is a lot less noisy then alternating between PWM levels 0 and 31.
  10 ---
  11  arch/arm/boot/dts/overlays/rpi-poe-overlay.dts | 2 +-
  12  1 file changed, 1 insertion(+), 1 deletion(-)
  13
  14 --- a/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
  15 +++ b/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
  16 @@ -16,7 +16,7 @@
  17                                 cooling-min-state = <0>;
  18                                 cooling-max-state = <4>;
  19                                 #cooling-cells = <2>;
  20 -                               cooling-levels = <0 31 63 150 255>;
  21 +                               cooling-levels = <0 1 10 100 255>;
  22                                 status = "okay";
  23                         };
  24                 };