35 lines
1.4 KiB
Diff
35 lines
1.4 KiB
Diff
From 6ed35e6ff556626734c400fff5a636b38b91fe19 Mon Sep 17 00:00:00 2001
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From: Alexey Charkov <alchark@gmail.com>
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Date: Mon, 20 Jan 2025 23:22:46 +0400
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Subject: arm64: dts: rockchip: Add finer-grained PWM states for the fan on
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Rock 5C
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Radxa Heatsink 6540B, which is the official cooling accessory for the
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Rock 5C board, includes a small 5V fan, which in my testing spins up
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reliably at a PWM setting of 24 (out of 255). It is also quite loud
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at the current minimum setting of 64, and noticeably less so at 24.
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Introduce two intermediate PWM states at the lower end of the fan's
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operating range to enable better balance between noise and cooling.
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Note further that, in my testing, having the fan run at 44 is enough
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to keep the system from thermal throttling with sustained 100% load
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on its 8 CPU cores (in 22C ambient temperature and no case)
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Signed-off-by: Alexey Charkov <alchark@gmail.com>
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Acked-by: Dragan Simic <dsimic@manjaro.org>
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Link: https://lore.kernel.org/r/20250120-rock-5c-fan-v1-1-5fb8446c981b@gmail.com
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Signed-off-by: Heiko Stuebner <heiko@sntech.de>
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--- a/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
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+++ b/arch/arm64/boot/dts/rockchip/rk3588s-rock-5c.dts
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@@ -71,7 +71,7 @@
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fan {
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compatible = "pwm-fan";
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#cooling-cells = <2>;
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- cooling-levels = <0 64 128 192 255>;
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+ cooling-levels = <0 24 44 64 128 192 255>;
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fan-supply = <&vcc_5v0>;
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pwms = <&pwm3 0 10000 0>;
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};
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