How to RPi 7inch LCD Use for 5B?

hogepiyo334 · January 18, 2023, 3:06pm

Hello, everyone.

I 'm trying using OSOYOO 7 inch MIPI DSI LCD for Rock5B.(Probably RPi 7 inch LCD compatible)
but, not working well…

OS: Ubuntu 20.04 Server + Ubuntu desktop
Type: Rock5B 16GB

Here’s what I’ve tried:

check FPC cable
-> not working
build & use RPi 7 inch LCD Driver for RockPi4

radxa/kernel/blob/linux-5.10-gen-rkr3.4/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c

/*
 * Copyright © 2016-2017 Broadcom
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Portions of this file (derived from panel-simple.c) are:
 *
 * Copyright (C) 2013, NVIDIA Corporation.  All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sub license,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions

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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>;

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/boot/config.txt

dtoverlay=raspberrypi-7-inch-lcd-overlay

/sys/class/drm

rock@rock-5b:~$ ls /sys/class/drm
card0  card0-DP-1  card0-HDMI-A-1  card0-HDMI-A-2  card0-Writeback-1  card1  renderD128  renderD129  version

-> not working

use Radxa 10FHD LCD device tree

/boot/config.txt

dtoverlay=rock-5b-radxa-display-10fhd

-> not working

Is there anything else I should try?

tsadigov · March 28, 2023, 11:21pm

I would like to ask about your progress
As far as I understand you need to match use same value for dts.compatible and driver.compatible so that kernel knows which driver it should use for the given dts node.

In your case driver has .compatible = “raspberrypi,7inch-touchscreen-panel” but dts has compatible =“rockpi,tc358762”

sergey_vfx · July 1, 2023, 8:20pm

Me too is interested whether someone is more lucky than me getting the overlay working
Even though I am on 5A, I think the device tree would be pretty much identical.

Couple of things in addition to @tsadigov note is that the compatible from the metadata should be set to something like compatible = "radxa,rock-5b", "rockchip,rk3588";. And closer to the end there are also rockpi_* fields which do not seem to be applicable for the 5B.

I was also wondering, did you make the pin adapter yourself, or is there some off-the-shelf thing to make life easier?