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RK3399 GMAC 高速时候不稳定解决笔记

 3 years ago
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RK3399 GMAC 高速时候不稳定解决笔记

RK3399 GMAC 高速时候不稳定解决笔记

硬件是一个没有原理图的电视盒,有网口,大致移植后出现网口不稳定,表现为大流量自动断网.

image-3.png

提高vdd_log能临时解决.

echo 1050000 > /sys/kernel/debug/regulator/vdd_log/voltage
image-4.png

用户空间解决办法可以这样,但是并不优雅,打算改一下.

	vdd_log: vdd-log {
		compatible = "pwm-regulator";
		pwms = <&pwm2 0 25000 1>;
		regulator-name = "vdd_log";
		/*
		 * the firefly hardware using 3.0 v as APIO2_VDD
		 * voltage, but the pwm divider resistance is designed
		 * based on hardware which the APIO2_VDD is 1.8v.
		 * The correct min-microvolt measure in hardware is 430mV
		 * and the max-microvolt is 1.4V.
		 */
		regulator-min-microvolt = <800000>;
		regulator-max-microvolt = <1400000>;
		/* 加入0.3V偏置,这样电压就能达标. */
		regulator-microvolt-offset = <300000>;
		regulator-always-on;
		regulator-boot-on;
		/* 加入电源树防止警告 */
		pwm-supply = <&vcc5v0_sys>;
	};

我使用的是RK维护内核,毕竟只有这个功能才比较齐全,比较老,不能设置初始电压,设置偏置一样的.

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