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android – HDMI LCD vignetted border issue with iMX6 based Udoo Neo board-Exceptionshub

Posted by: admin February 26, 2020 Leave a comment

Questions:

I am struggling to find out the issue with is happened in my HDMI display and I can’t find any solution

I used udoo neo board with android os
And I have one HDMI LCD with touch display https://shop.udoo.org/7inch-hdmi-usb-display-touch.html

LCDis working fine with PC and Raspberry Pi 3 but when I connect this display to my Udoo Neo board it show vignetted screen border as below:

enter image description here

The DTS file has:

 / {
        codec_hdmi: hdmi-codec {
            compatible = "udoo,tda19988-codec";
            status = "okay";
        };

        sound_hdmi {
            compatible = "udoo,audio-tda19988";
            model = "imx6sx-tda19988";
            cpu-dai = <&ssi2>;
            audio-codec = <&codec_hdmi>;
            mux-int-port = <2>;
            mux-ext-port = <5>;
            ssi-controller = <&ssi2>;
            status = "okay";
        };

    };

    &i2c3 {
        status = "okay";

        tda19988: [email protected] {
            compatible = "udoo,tda19988";
            reg = <0x34>;
            status = "okay";
        };
    };

    &lcdif1 {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_lcdif_dat_0
        &pinctrl_lcdif_ctrl_0>;
        lcd-supply = <&vgen5_reg>;
        display = <&display0>;
        status = "okay";

        display0: display {
            bits-per-pixel = <32>;
            bus-width = <24>;

            display-timings {
                native-mode = <&timing0>;
                timing0: timing0 {
                    clock-frequency = <74250000>;
                    hactive = <1280>;
                    vactive = <720>;
                    hback-porch = <220>;
                    hfront-porch = <110>;
                    vback-porch = <20>;
                    vfront-porch = <5>;
                    hsync-len = <40>;
                    vsync-len = <5>;

                    hsync-active = <0>;
                    vsync-active = <1>;
                    de-active = <1>;
                    pixelclk-active = <0>;
                };
            };
        };
    };

    &dcic1 {
        dcic_id = <0>;
        dcic_mux = "dcic-lcdif1";
        status = "okay";
    };

    &ssi2 {
        fsl,mode = "i2s-master";
        status = "okay";
    };

    &audmux {
        pinctrl-names = "default";
        pinctrl-0 = <&pinctrl_audmux_hdmi>;
        status = "okay";
    };

I don’t know why this happening please help me

How to&Answers: