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97 lines
2.8 KiB
Diff
97 lines
2.8 KiB
Diff
From 863dace20e48954a7e013a2e88e27c692ce165b0 Mon Sep 17 00:00:00 2001
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From: Nick B <nick@pelagiris.org>
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Date: Mon, 9 Mar 2020 09:05:39 -0400
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Subject: [PATCH] Reduce noise from rpi poe hat fan
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This adds 2 extra states, at 40c and 45c, with PWM of 31 and 63 (out
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of 255) for the rpi poe hat fan. This significantly improves user
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experience by providing a smoother ramp up of the fan, from a pwm 0
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to 31 to 63 then finally to 150, and additionally makes it very easy
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for users to further tweak the values as needed for their specific
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application.
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The possible concerns I have are that a hysteresis of 2000 (2c) could
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be too narrow, and that running the fan more at a reduced temperature
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(40000 - 40c) could cause problems.
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Signed-off-by: Nick B <nick@pelagiris.org>
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---
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.../arm/boot/dts/overlays/rpi-poe-overlay.dts | 35 ++++++++++++++++---
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1 file changed, 30 insertions(+), 5 deletions(-)
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--- a/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
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+++ b/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
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@@ -14,9 +14,9 @@
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compatible = "raspberrypi,rpi-poe-fan";
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firmware = <&firmware>;
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cooling-min-state = <0>;
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- cooling-max-state = <2>;
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+ cooling-max-state = <4>;
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#cooling-cells = <2>;
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- cooling-levels = <0 150 255>;
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+ cooling-levels = <0 31 63 150 255>;
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status = "okay";
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};
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};
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@@ -27,12 +27,21 @@
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__overlay__ {
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trips {
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trip0: trip0 {
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- temperature = <50000>;
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- hysteresis = <5000>;
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+ temperature = <40000>;
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+ hysteresis = <2000>;
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type = "active";
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};
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trip1: trip1 {
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-
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+ temperature = <45000>;
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+ hysteresis = <2000>;
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+ type = "active";
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+ };
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+ trip2: trip2 {
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+ temperature = <50000>;
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+ hysteresis = <2000>;
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+ type = "active";
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+ };
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+ trip3: trip3 {
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temperature = <55000>;
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hysteresis = <5000>;
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type = "active";
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@@ -47,6 +56,14 @@
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trip = <&trip1>;
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cooling-device = <&fan0 1 2>;
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};
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+ map2 {
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+ trip = <&trip2>;
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+ cooling-device = <&fan0 2 3>;
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+ };
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+ map3 {
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+ trip = <&trip3>;
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+ cooling-device = <&fan0 3 4>;
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+ };
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};
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};
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};
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@@ -58,6 +75,10 @@
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poe_fan_temp0_hyst = <&trip0>,"hysteresis:0";
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poe_fan_temp1 = <&trip1>,"temperature:0";
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poe_fan_temp1_hyst = <&trip1>,"hysteresis:0";
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+ poe_fan_temp2 = <&trip2>,"temperature:0";
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+ poe_fan_temp2_hyst = <&trip2>,"hysteresis:0";
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+ poe_fan_temp3 = <&trip3>,"temperature:0";
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+ poe_fan_temp3_hyst = <&trip3>,"hysteresis:0";
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};
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};
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@@ -66,5 +87,9 @@
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poe_fan_temp0_hyst = <&trip0>,"hysteresis:0";
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poe_fan_temp1 = <&trip1>,"temperature:0";
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poe_fan_temp1_hyst = <&trip1>,"hysteresis:0";
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+ poe_fan_temp2 = <&trip2>,"temperature:0";
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+ poe_fan_temp2_hyst = <&trip2>,"hysteresis:0";
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+ poe_fan_temp3 = <&trip3>,"temperature:0";
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+ poe_fan_temp3_hyst = <&trip3>,"hysteresis:0";
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};
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};
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