Interfacing (DSI, CSI, I2C, etc.) • Re: DSI LCD works on Pi 5 but not on CM4 (same driver, same IC)

Hello @6by9 ,

First I download the tree that you modified, then I compiled the vc4.ko module, and replaced the new module with the old one, but nothing changed.

Then, since you said that the panel driver requests to drive the display in sync event mode, I modified the driver to request sync pulse mode
dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE | MIPI_DSI_MODE_LPM;
but also nothing changed, the screen is still blacked out.

could it be that I am doing something wrong while loading the new vc4.ko? which I don't think this can be the case but I added some printk function in the new vc4_dsi.c but none of these logs were found in dmesg or journalctl

Also the LCD that im using is not ronbo, it is AD070IP532NG06-A, but its very similar ronbo panel, It uses EK79007 display IC, which should support:

Non-Burst Mode with Sync Pulses
Non-Burst Mode with Sync Event
Brust Mode

Thanks in Advance!

Statistics: Posted by ORR — Sun Sep 07, 2025 7:03 am

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