[RK3399][Android7.1] 调试笔记 --- I2C读取错误unexpected irq in STOP: 0x10

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Platform: RK3399
OS: Android 7.1
Kernel: v4.4.83

现象：

当快速连续多次执行busybox hwclock -r去读取rtc硬件里的时间时，出现如下error:

[ 1003.621100] rtc rtc0: read_time: fail to read: -22

或者

[ 1009.333255] rk3x-i2c ff3d0000.i2c: unexpected irq in STOP: 0x10
[ 1010.329904] rk3x-i2c ff3d0000.i2c: timeout, ipd: 0x00, state: 4
[ 1010.329992] rtc rtc0: read_time: fail to read: -110

---

解决方法：

降低I2C速率到100k,默认I2C驱动用的就是100k，所以不需要配置。

&i2c4 {
	status = "okay";
	/*
	i2c-scl-rising-time-ns = <345>;
	i2c-scl-falling-time-ns = <11>;
	clock-frequency = <400000>;
	*/
    rx8010: rx8010@32 {
		compatible = "epson,rx8010";
		reg = <0x32>;
		status = "okay";
    };
};