rk3568屏幕抖动问题

问题描述：有时候操作屏幕界面，发现屏幕有抖动的情况。

经跟RK原厂沟通，此问题跟给ddr供电的vdd_logic有关系。vdd_logic默认定义：

vdd_logic: DCDC_REG1 {
                regulator-always-on;
                regulator-boot-on;
                regulator-min-microvolt = <500000>;
                regulator-max-microvolt = <1350000>;
                regulator-init-microvolt = <900000>;
                regulator-ramp-delay = <6001>;
                regulator-initial-mode = <0x2>;
                regulator-name = "vdd_logic";
                regulator-state-mem {
                    regulator-off-in-suspend;
                };
            };

需要把最小电压regulator-min-microvolt抬高一些：