RK平臺mipi屏初始化序列配置

2023年12月9日發(fā)(作者：珍惜愛)

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RK平臺mipi屏初始化序列配置

RK平臺mipi屏初始化序列都是在dts中進(jìn)行配置，有兩種方式，下面分別介紹兩種方式的配置方法。

方式一

RK平臺較老的SDK采用下面方式配置mipi參數(shù)，如：RK3128 5.1 SDK中就是采用的下面方式。

示例：

/ {

/* 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 = <&gpio2 GPIO_D1 GPIO_ACTIVE_HIGH>;

rockchip,delay = <20>;

};

mipi_lcd_en:mipi_lcd_en {

compatible = "rockchip,lcd_en";

rockchip,gpios = <&gpio2 GPIO_D0 GPIO_ACTIVE_LOW>;

rockchip,delay = <100>;

};

*/

};

disp_mipi_init_cmds: screen-on-cmds {

compatible = "rockchip,screen-on-cmds";

rockchip,cmd_debug = <1>;

rockchip,on-cmds1 {

compatible = "rockchip,on-cmds";

rockchip,cmd_type = ;

rockchip,dsi_id = <0>;

rockchip,cmd = <0x15 0xE0 0x00>;

rockchip,cmd_delay = <0>;

};

rockchip,on-cmds2 {

compatible = "rockchip,on-cmds";

rockchip,cmd_type = ;

rockchip,dsi_id = <0>;

rockchip,cmd = <0x39 0x55 0x10 0x10 0x10 0x10 0x10 0x10 0x10 0x10>;

rockchip,cmd_delay = <0>;

};

//SLP OUT

rockchip,on-cmds3 {

compatible = "rockchip,on-cmds";

rockchip,cmd_type = ;

rockchip,dsi_id = <0>;

rockchip,cmd = <0x05 0x11>;

rockchip,cmd_delay = <120>;

};

//DISP ON

rockchip,on-cmds4 {

rockchip,on-cmds4 {

compatible = "rockchip,on-cmds";

rockchip,cmd_type = ;

rockchip,dsi_id = <0>;

rockchip,cmd = <0x05 0x29>;

rockchip,cmd_delay = <5>;

};

};

disp_timings: display-timings {

native-mode = <&timing0>;

compatible = "rockchip,display-timings";

timing0: timing0 {

screen-type = ;

lvds-format = ;

out-face = ;

clock-frequency = <67330000>;

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>;

};

};

};

這里只分析disp_mipi_init_cmds的配置規(guī)則，disp_mipi_init、disp_mipi_power_ctl、disp_timings不分析，其中disp_timings可以參考另一

篇文章：《如何確定lcd timing參數(shù)》。

下面代碼段為一條mipi初始化數(shù)據(jù)，主要關(guān)心的參數(shù)有“rockchip,cmd”和“rockchip,cmd_delay”。

rockchip,on-cmds1 {

compatible = "rockchip,on-cmds";

rockchip,cmd_type = ;

rockchip,dsi_id = <0>;

rockchip,cmd = <0x15 0xE0 0x00>;

rockchip,cmd_delay = <0>;

};

rockchip,cmd

命令格式如下：

0x15 0xE0 0x00

| | |

| | 數(shù)據(jù)

| 寄存器地址

命令類型（0x05: 單字節(jié)數(shù)據(jù) 0x15: 雙字節(jié)數(shù)據(jù) 0x39: 多字節(jié)數(shù)據(jù)）

單字節(jié)數(shù)據(jù)舉例：

rockchip,on-cmds3 {

compatible = "rockchip,on-cmds";

rockchip,cmd_type = ;

rockchip,dsi_id = <0>;

rockchip,cmd = <0x05 0x11>;

rockchip,cmd_delay = <120>;

};

雙字節(jié)數(shù)據(jù)舉例：

rockchip,on-cmds1 {

compatible = "rockchip,on-cmds";

rockchip,cmd_type = ;

rockchip,dsi_id = <0>;

rockchip,cmd = <0x15 0xE0 0x00>;

rockchip,cmd_delay = <0>;

};

多字節(jié)數(shù)據(jù)舉例：

rockchip,on-cmds2 {

compatible = "rockchip,on-cmds";

rockchip,cmd_type = ;

rockchip,dsi_id = <0>;

rockchip,cmd = <0x39 0x55 0x10 0x10 0x10 0x10 0x10 0x10 0x10 0x10>;

rockchip,cmd_delay = <0>;

};

rockchip,cmd_delay

此字段定義發(fā)送完命令后延時時長，單位毫秒（ms），大部分命令無須延時。

方式二

RK平臺新的SDK已經(jīng)統(tǒng)一采用下面方式配置mipi參數(shù)，如：RK3288 8.1 SDK中就是采用的下面方式。

示例：

&dsi0 {

status = "okay";

rockchip,lane-rate = <600>;

panel: panel {

compatible = "simple-panel-dsi";

reg = <0>;

backlight = <&backlight>;

enable-gpios = <&gpio7 3 GPIO_ACTIVE_HIGH>;

//ret-gpios = <&gpio7 4 GPIO_ACTIVE_HIGH>;

power-supply = <&vcc_lcd>;

dsi,flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST)>;

dsi,format = ;

dsi,lanes = <4>;

ret-delay-ms = <20>;

init-delay-ms = <20>;

enable-delay-ms = <120>;

prepare-delay-ms = <120>;

status = "okay";

panel-init-quence = [

15 00 02 80 77

15 00 02 81 77

15 00 02 82 77

15 00 02 83 77

15 00 02 84 77

15 00 02 85 77

15 00 02 86 77

05 64 01 11

05 14 01 29

];

panel-exit-quence = [

05 64 01 28

05 96 01 10

];

disp_timings: display-timings {

native-mode = <&timing2>;

timing2: timing0 {

clock-frequency = <52000000>;

hactive = <1024>;

vactive = <600>;

hback-porch = <160>;

hfront-porch = <160>;

vback-porch = <23>;

vfront-porch = <12>;

hsync-len = <10>;

vsync-len = <10>;

hsync-active = <0>;

vsync-active = <0>;

de-active = <0>;

pixelclk-active = <0>;

};

};

};

};

這里依然只分析panel-init-quence和panel-exit-quence的配置規(guī)則，其它配置可以參考另一篇文章：《如何確定lcd timing參數(shù)》。

新的mipi初始化序列配置規(guī)則與老方法其實(shí)是一致的，只是改寫了表達(dá)方式，如下：

panel-init-quence = [

15 00 02 80 77

15 00 02 81 77

15 00 02 82 77

15 00 02 83 77

15 00 02 84 77

15 00 02 85 77

15 00 02 86 77

39 00 0D C3 01 66 13 23 00 66 85 33 20 38 38 00

05 64 01 11

05 14 01 29

];

中括號里的內(nèi)容，每一行表示一串命令字，規(guī)則如下：

15 00 02 80 77

| | | | |

| | | | 數(shù)據(jù)

| | | | 寄存器地址

| | 數(shù)據(jù)長度

| 延時

命令類型（0x05: 單字節(jié)數(shù)據(jù) 0x15: 雙字節(jié)數(shù)據(jù) 0x39: 多字節(jié)數(shù)據(jù)）

單字節(jié)數(shù)據(jù)舉例：

05 64 01 11

雙字節(jié)數(shù)據(jù)舉例：

15 00 02 86 77

多字節(jié)數(shù)據(jù)舉例：

39 00 0D C3 01 66 13 23 00 66 85 33 20 38 38 00

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