topic Re: imx93 LVDS clock settings in i.MX Processors

imx93 LVDS clock settings

mark_vogt — Mon, 11 Sep 2023 15:42:36 GMT

I am trying to output LVDS using i.MX93 but I am having trouble adjusting the LVDS clock frequency.

I am using imx93-11x11-evk-boe-wxga-lvds-panel.dts as an example, but I'm having trouble understanding this section for the clocks.

&lcdif { assigned-clock-rates = <498000000>, <71142857>, <400000000>, <133333333>; };

I am trying to get a 1024x600 display working with a pixel clock of 51.2MHz. I have gotten close (57MHz) with the following settings, but the display is stretched in the horizontal direction.

Here are the clk settings I used to get 57MHz. I assumed the first 2 clocks are 7x because that was what the 8mplus used.

assigned-clock-rates = <400000000>, <57142857>, <400000000>, <133333333>;

Here is my display timing in panel simple

.clock = 51200, .hdisplay = 1024, .hsync_start = 1024 + 178, .hsync_end = 1024 + 178 + 20, .htotal = 1024 + 178 + 20 + 178, //1400 .vdisplay = 600, .vsync_start = 600 + 95, .vsync_end = 600 + 95 + 10, .vtotal = 600 + 95 + 10 + 95, //800

Re: imx93 LVDS clock settings

joanxie — Tue, 12 Sep 2023 06:55:09 GMT

I have already mailed to you, pls modify the source code according to my suggestion

Re: imx93 LVDS clock settings

mb1 — Mon, 20 Nov 2023 10:02:30 GMT

Hi.

We're also facing problems adjusting the clock values according to our needs.

We had a working solution with 6.1.1_1.0.0 release based kernel code. Something seemed to have changed. We usually follow this formula:

#define PIXCLK 25175000 &lcdif { assigned-clock-rates = <(PIXCLK * 7)>, <PIXCLK>, <400000000>, <133333333>; };

Would be great if you could share your advice public instead of mailing it private to some people.

Best regards

Markus Bauer

Re: imx93 LVDS clock settings

AchimKanert1 — Wed, 28 Feb 2024 07:49:39 GMT

Hi,

can you perhaps share the source code changes needed.

Regards,

Achim Kanert

Re: imx93 LVDS clock settings

etostd — Mon, 02 Dec 2024 14:29:56 GMT

Can you please share your suggested modification?

Re: imx93 LVDS clock settings

joanxie — Tue, 03 Dec 2024 01:20:30 GMT

do you mind creating a new thread for you request? click "submit a ticket"

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