MIPI屏调试

最新推荐文章于 2025-06-13 14:51:07 发布

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#android #rk3368 #mipi

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本文档主要介绍在基于RK3368平台，搭载Android 6.0操作系统的环境下，如何进行MIPI屏的调试工作。内容包括在设备树中开启MIPI功能，配置屏的上电时序以及根据原理图和屏资料设定初始化命令。

Platform: RK3368

OS: Android 6.0

Kernel: 3.10.0

在dts中将mipi功能打开

&dsihost0{
	status = "okay";
};

配置时序
根据原理图和屏资料配置上电时序,比如LCD_EN,LCD_RST等等.有些MIPI屏可能还需要配置很多初始化命令.

#include <dt-bindings/rkmipi/mipi_dsi.h>
/ {
	/* about mipi */
	disp_mipi_init: mipi_dsi_init{
		compatible = "rockchip,mipi_dsi_init";
		rockchip,screen_init	= <1>;
		rockchip,dsi_lane	= <4>;
		rockchip,dsi_hs_clk	= <550>;
		rockchip,mipi_dsi_num	= <1>;
	};
	disp_mipi_power_ctr: mipi_power_ctr {
		compatible = "rockchip,mipi_power_ctr";
		mipi_lcd_rst:mipi_lcd_rst{
				compatible = "rockchip,lcd_rst";
				rockchip,gpios = <&gpio1 GPIO_A6 GPIO_ACTIVE_HIGH>;
				rockchip,delay = <100>;
		};
		mipi_lcd_en:mipi_lcd_en {
				compatible = "rockchip,lcd_en";
				rockchip,gpios = <&gpio0 GPIO_D5 GPIO_ACTIVE_HIGH>;
				rockchip,delay = <100>;
		};
	};

RK3368初始化命令dts格式:

rockchip,cmd = <数据类型 命令 参数>;
0x05为命令不带参数
0x15为命令带一个参数
0x39为命令带多个参数

	disp_mipi_init_cmds: screen-on-cmds {
		compatible = "rockchip,screen-on-cmds";
		rockchip,cmd_debug = <0>;
		rockchip,on-cmds1 {
		compatible = "rockchip,on-cmds";
		rockchip,cmd_type = <LPDT>;
		rockchip,dsi_id = <0>;
		rockchip,cmd = <0x15 0xE0 0x00>;
		rockchip,cmd_delay = <0>;
		};
		......
	};

根据屏资料(规格书,手册等)配置时序,

	disp_timings: display-timings {
                native-mode = <&timing0>;
                compatible = "rockchip,display-timings";
                timing0: timing0 {
			screen-type = <SCREEN_MIPI>;
			lvds-format = <LVDS_8BIT_2>;
			out-face    = <OUT_P888>;
			clock-frequency = <67300000>;
			hactive = <800>;
			vactive = <1280>;
			hback-porch = <18>;
			hfront-porch = <18>;
			vback-porch = <10>;
			vfront-porch = <20>;
			hsync-len = <18>;
			vsync-len = <4>;
			hsync-active = <0>;
			vsync-active = <0>;
			de-active = <0>;
			pixelclk-active = <0>;
			swap-rb = <0>;
			swap-rg = <0>;
			swap-gb = <0>;
		};
	};
};