Imx6 LVDS Display Problems

[georg1]

Hello,

We are working with a modified version of the imx6q-apalis-eval.dtb. Our System is running fine but we recently needed to switch to a new Touch Display: https://www.telerex-europe.com/content/files/pdfs/productPdfs/POW/PH102600T009-IBC03.pdf

We have some Issues with the Displays Colors... there are strange stripes in our Colors and sometimes there are appearing purple pixels on screen.

I Modified the Device Tree Files like this:

&ldb {

    status = "okay";

    lvds-channel@0 {

        reg = <0>;

        fsl,data-mapping = "spwg";

        fsl,data-width = <24>;

        crtc = "ipu1-di0";

        primary;

        status = "okay";

        display-timings {

            native-mode = <&timing_wsvga>;

            timing_wsvga: 1024x600 {

                clock-frequency = <48000000>;

                hactive = <1024>;

                vactive = <600>;

                hback-porch = <104>;

                hfront-porch = <43>;

                vback-porch = <24>;

                vfront-porch = <20>;

                hsync-len = <5>;

                vsync-len = <5>;

                de-active = <1>;

                hsync-active = <0>;

                vsync-active = <0>;

                pixelclk-active = <0>;

            };

            /* Standard XGA timing */

            timing_xga: 1024x768 {

                clock-frequency = <65000000>;

                hactive = <1024>;

                vactive = <768>;

                hback-porch = <160>;

                hfront-porch = <24>;

                vback-porch = <29>;

                vfront-porch = <3>;

                hsync-len = <136>;

                vsync-len = <6>;

                de-active = <1>;

                hsync-active = <0>;

                vsync-active = <0>;

                pixelclk-active = <0>;

            };

        };

    };

    mxcfb1: fb@0 {

        compatible = "fsl,mxc_sdc_fb";

        disp_dev = "ldb";

        interface_pix_fmt = "RGB666";

        mode_str ="LDB-XGA";

        default_bpp = <16>;

        int_clk = <0>;

        late_init = <0>;

        status = "okay";

    };

vidargs are:

vidargs=video=mxcfb0:dev=ldb,if=RGB24,bpp=32 ldb=sin0 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off fbmem=32M

I managed to catch the issue on my phone... i cant think of a better way to send you a image of the issue... but u can clearly see the stripes, the purple pixels and the red pixels. ... this is just a picture of the floor, a red door in the background and a part of my leg... the image is displayed on our software.

I think these are the relevant parts... I tried to modify the interface_pix_fmt values and set it to something else.. but no success... maybe my display timings are off?... I cant find any relevant display timing data in that data sheet. Can somebody help me maybe?

greetings,

Georg

[igorpadykov]

Hi George

apalis board was developed and supported by toradex, it may be posted on its forum:

Welcome to - Toradex Community 

Among other things may be useful to check bootargs: "if=RGB24" in one place and RGB666 in dts file.

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------