Device Tree overlay LVDS data mapping

Technical Support
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1

Hi, I’ve created a device tree overlay to replace my old entire device tree since BSP 5.x support overlays, however the data-mapping for lvds appears to not be working the same. In my old device tree I had fsl,data-width = <18>;. Now in my device tree overlay I have the corresponding data-mapping according to your table here data-mapping = "jeida-18";. Everything else timing wise is the exact same however the display has incorrect colors that looks to me like a data-mapping issue. The only new/different thing is width-mm and height-mm however I don’t believe having those incorrect would cause this issue, perhaps I’m wrong. Thanks.

2

Do you have a
fsl,data-mapping = “spwg”;
fsl,data-width = <18>;

at lvds-channel@0 node as descried here?

3

Is this something I would do in an Device tree overlay?
It was my understanding that data-mapping within panel-lvds was the equivalent, and made setting them within lvds-channel@0 not necessary.

4

I haven’t play with it but per my knowledge yo should have

&ldb2 {
        status = "okay";
        fsl,dual-channel;

        lvds-channel@0 {
                fsl,data-mapping = "spwg";
                fsl,data-width = <18>;

and

panel_lvds: panel-lvds {
        compatible = "panel-lvds";

        data-mapping = "jeida-18";