am5728: Video capture with discrete sync

Part Number: AM5728

I can capture the video successfully, but the video offset to right and down.

I used discrete sync.

How can i fix this problem? How to set the Horizontal and the Vertical offsets in the RDK?

RDK version: ti-processor-sdk-linux-am57xx-evm-03.03.00.04

capture chip:adv7612，HDMI in，dual 8BIT out

resolution： 800x600@60

test code: Based on dual-camera-demo-1.0, remove QT dependence.

my dts clips:

&i2c1 {
    status = "okay";
    clock-frequency = <400000>;

.......

    adv7612:adv7612@4c {
        compatible = "adi,adv7612";
        reg = <0x4c>;

        default-input = <0>;

        port {
            cam: endpoint {
                remote-endpoint = <&vin3a>;
                hsync-active = <1>;
                vsync-active = <1>;
                pclk-sample = <0>;
                bus-width = <8>;
            };
        };
    };
};

&vip2 {
    status = "okay";
};

&vin3a {
    status = "okay";
    endpoint {
        slave-mode;
        remote-endpoint = <&cam>;
    };
};

Best Regards!

Jia