42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
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From 7c522400f21ff7aa2e2bf8b4c681aaa8eb464659 Mon Sep 17 00:00:00 2001
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From: Ondrej Jirman <megi@xff.cz>
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Date: Thu, 30 Mar 2023 13:45:08 +0200
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Subject: [PATCH 296/464] arm64: dts: rk3399-pinephone-pro: Switch LED
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backlight PWM from 1kHz to 20kHz
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This gets rid of measurable backlight flicker, because LED driver's feedback
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voltage reference lowpass filter is now driven above the cutoff frequency
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of 5 kHz.
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Also adapt the brightness levels curve, to make sure the lowest setting
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satisfies requirement to have duty cycle at least 250ns. Backlight LED
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driver doesn't react to smaller pulses on the EN/PWM pin.
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Signed-off-by: Ondrej Jirman <megi@xff.cz>
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---
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arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
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index 873f88565cb0..c252ff2e604e 100644
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--- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
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+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
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@@ -208,6 +208,14 @@ ppkb_battery: keyboard-battery {
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backlight: backlight {
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compatible = "pwm-backlight";
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pwms = <&pwm0 0 50000 0>;
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+ brightness-levels =
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+ <0 250 360 470 580 690 810 949 1110 1294 1502
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+ 1737 1998 2289 2610 2964 3351 3774 4233 4731
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+ 5268 5847 6467 7133 7845 8604 9412 10271 11182
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+ 12146 13164 14239 15374 16568 17822 19140 20521
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+ 21969 23483 25068 26722 28447 30247 32121 34071
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+ 36099 38210 40400 42669 45026 47468 50000>;
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+ default-brightness-level = <17>;
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};
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leds {
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--
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2.34.1
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