IMX8MQ MIPI DSI - Waveshare panel

RomainLt — Mon, 02 Jun 2025 09:25:01 GMT

Hi all,

I'm trying to connect a waveshare panel via mipi dsi to my imx8mq board using a custom ffc. I used the lcdif controller of the imx, but it seems that I have clocks timing issues that I can't figure out.

I'm using the waveshare 10.1-DSI-TOUCH-A and the drivers https://files.waveshare.com/wiki/common/Panel-waveshare-dsi2-driver.zip.
Furthermore, I'm working with linux kernel 5.15.71.

I have currently no errors related to the drivers and the backlight works properly, but there are no pixels on screen. I checked by charging the HDMI overlay, which is working.

Based on my screen, I could verify and calculated the following:
- pixels_per_second: 1280 * 800 * 60 * 24 = 1_474_560_000 ~= 1,47Gpixels/sec
- pixelclock: (800 + 40 + 20 + 20) × (1280 + 20 + 4 + 20) × 60 = 69_907_200 ~= 70_000_000 = 70_000kHz
- bit_clk = pixelclock * bits_per_pixel / number_of_lanes = 70_000_000 * 24 / 2 = 840_000_000 = 840MHz

I tried to apply them to my dsi overlay without success.
I linked the default values on which my overlay is based (cf files maaxboard.dts and imx8mq.dtsi named imx8mq.dts because of the forum restrictions), and the overlay I changed (named display-mipi.dts).

Do you have any advice on how to configure clocks for lcdif controller (or even DCSS controller) ?

Thanks for your time.

Re: IMX8MQ MIPI DSI - Waveshare panel

AldoG — Sat, 07 Jun 2025 00:38:38 GMT

Hello,

Please have a look to the following community thread:
https://community.nxp.com/t5/i-MX-Processors/How-to-config-MIPI-DSI-clock-and-data-rate-on-imx8mq/m-p/1041683

Best regards/Saludos,
Aldo.

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IMX8MQ MIPI DSI - Waveshare panel

Re: IMX8MQ MIPI DSI - Waveshare panel