ov5640图像显示花屏的原因？

我使用STM32mp135faf7芯片，自己layout板子，使用ov5640摄像头模块，把图像显示到显示屏上，无法得到正常的camera图像，显示的是花屏，但用手或者光源靠近camera，能看到显示有变化。
dts配置如下
dcmipp {status = "okay";pinctrl-names = "default", "sleep";pinctrl-0 = < dcmipp_pins_mx>;pinctrl-1 = < dcmipp_sleep_pins_mx>;
port {dcmipp_0: endpoint {remote-endpoint = < ov5640_0>;bus-width = <8>;hsync-active = <0>;vsync-active = <0>;pclk-sample = <1>;pclk-max-frequency = <77000000>;};};};
ov5640: camera@3c {compatible = "ovti,ov5640";reg = <0x3c>;clocks = < clk_ext_camera>;clock-names = "xclk";DOVDD-supply = < vdd>;//reset-gpios = < gpioh 4 (GPIO_ACTIVE_LOW | GPIO_PUSH_PULL)>;//rotation = <180>;status = "okay";
port {ov5640_0: endpoint {remote-endpoint = < dcmipp_0>;bus-width = <8>;bus-type = <5>;data-shift = <2>;hsync-active = <0>;vsync-active = <0>;pclk-sample = <1>;pclk-max-frequency = <77000000>;};};};
请教一下 应该如何解决