Rock PI4c MIPI DSI not working

britus · September 16, 2020, 12:33pm

Hi,
I’m using this panel:
https://osoyoo.com/2019/11/12/instruction-for-raspberry-pi-7-dsi-touch-screen
All images

rockpi4c-android10-20200727_1032_ff35b7a-rkupdate.img
rockpi4c_ubuntu_focal_minimal_arm64_20200820_1207-gpt.img
rockpi4c_debian_stretch_desktop_arm64_20200716_0647-gpt.img

does not work with the Raspberry PI Touchscreen. The OSOYOO panel works fine if connected to Raspberry PI 3B+.
Any solutions?

jack · September 28, 2020, 3:27am

4C is a little bit different because rk3399 has only two video output engine and we used for hdmi and dp by default. The overlay should be updated for that(to disable the dp and enable the mipi). @Stephen will update it.

britus · September 29, 2020, 5:46am

Hello Jack,
Thanks for your answer :mild_smile: Is it possible to publish the overlay source so I can compile the overlay with dtc to create the dtbo file. I saw the use of the dsi bridge kernel driver ‘panel-toshiba-tc358762.c’ (driver name ‘bridge-tc358762-dsi’) in the kernel 4.4x of the ASUS Tinkerboard-s. The touchscreen input kernel driver is the i2c kernel driver edt_ft5x06. Thanks in advance.

jack · September 29, 2020, 9:16am

The overlay source is available here:

github.com

radxa/kernel/blob/release-4.4-rockpi4/arch/arm64/boot/dts/rockchip/overlays-rockpi4/raspberrypi-7-inch-lcd-overlay.dts

/dts-v1/;
/plugin/;

/ {
	model = "ROCK PI 4B";
	compatible = "rockchip,rockpi","rockchip,rk3399";

	fragment@0 {
		target = <&dsi>;

		__overlay__ {
			status = "okay";
		};
	};

	fragment@1 {
		target = <&dsi1>;

		__overlay__ {
			rockchip,dual-channel = <&dsi>;

This file has been truncated. show original

You need to adapt it to the 4c dts adding disabling the DP.

pro_info · February 1, 2021, 10:07pm

Hi,
For several days now, I’ve been trying to get a MIPI DSI touch screen to work with my rockpi 4c, but with no real success so far. I’m really interested in the information because I’ve exhausted all the tracks.

I have this screen https://www.waveshare.com/wiki/4.3inch_DSI_LCD but it’s like 7-inch rpi lcd screens.

I found this commit that I find interesting https://github.com/radxa/kernel/commit/24a1bbfaf70146ad7aca43e9b30cab0671ae303c

I’m cloning the repository to compile the kernel, to get the overlay, but I have little hope. I usually use dietpi rather than armbian (even if in both cases the base is common), the screen always stays black.

Thanks !

jorrit · May 16, 2022, 8:42pm

I am having issues with the displays as well. As soon as I enable the display overlay on the latest Debian with desktop image for RockPi4 C, it simply renders the device un-bootable. As soon as I uncomment the line again it starts working again.

Can someone please help? Until now I’ve only had issues with RockPi, I’m almost regretting not getting a Raspberry Pi. This has cost me a lot of time already while it should’ve been plug and play.

Some help would really be appreciated. Thanks.