i.MX GraphicsのトピックRe: i.MX93 without a GPU, parallel RGB LCD

i.MX93 without a GPU, parallel RGB LCD

davidpatton — Fri, 20 Feb 2026 21:11:11 GMT

The i.MX93's we are getting have the 2D GPU removed so we have no graphics accelerator. Back with the i.MX6SX we just did basic frame buffer stuff, I assume the same here. But I cannot find much help. I'm just trying to get the penguin during boot.

We are using Yocto Scarthgap, so I believe the kernel is 6.6.36. I found a patch titled:

Add i.MX91/93 parallel display support

dated 12/01/2025, which makes it sound like the kernel I am currently using may not even support what I'm trying to do. Also, everything, at least in the source tree, is under gpu/drm, and again I have no gpu.

I built what I thought was a simple panel in the device tree, but the kernel freezes during boot:

&lcdif {

status = "okay";

display = <&display_conf>;

display_conf: display-0 {

bits-per-pixel = <16>; /* or 18, 16, etc. depending on your panel */

bus-width = <18>;

panel {

compatible = "panel-simple";

backlight = <&backlight>; /* phandle to your backlight node */

status = "okay";

display-timings {

native-mode = <&timing0>;

timing0: timing0 {

clock-frequency = <25000000>;

hactive = <800>;

vactive = <480>;

hback-porch = <8>;

hfront-porch = <8>;

vback-porch = <16>;

vfront-porch = <16>;

hsync-len = <4>;

vsync-len = <4>;

hsync-active = <0>;

vsync-active = <0>;

pixelclk-active = <0>;

};

Thanks!

Re: i.MX93 without a GPU, parallel RGB LCD

Manuel_Salas — Mon, 23 Feb 2026 20:20:13 GMT

Hello @davidpatton

I hope you are doing very well.

Please take a look to the imx91-11x11-evk-tianma-wvga-panel.dts.

There is an example of parallel display in i.MX91.

Best regards,

Salas.

Re: i.MX93 without a GPU, parallel RGB LCD

davidpatton — Tue, 24 Feb 2026 21:57:04 GMT

Thanks, I'm good...will be much better once I see the display working.

I tried adding a display like in the example, but still nothing. I'm not at all certain I have my kernel configured correctly. Not having a GPU but seeing all of the code under "gpu" in the drivers directory is concerning me.

I'm adding my dts and kernel config....I also do not understand the "assigned-clock-rates" binding at all and what I should put there and what it's based on. I looked at the documentation, it didn't help...

Thanks!

Re: i.MX93 without a GPU, parallel RGB LCD

davidpatton — Wed, 04 Mar 2026 17:23:03 GMT

Even though I do not have chips with a GPU, I still used code under drivers/gpu, that was just a little confusing. Attached is the device tree that got it to work, for future reference.