Mangopi MQ-R：T113-s3（四）Tina系统 适配LCD屏幕

• $ source build/envsetup.sh
• $ lunch
• 选择开发板：$ 7
• 编译：$ make
• 打包boot0和uboot为一个文件：$ mboot
• 打包成一个.img镜像：$ pack

打包好的地址为：/Tina-Linux/out/t113-mq_r/tina_t113-mq_r_uart0.img
使用phoenixcard4.2.8.zip烧录启动卡到SD卡里面去

适配LCD

注意需要重新适配两个设备树

修改Linux Kernel的设备树：Tina-Linux/device/config/chips/t113/configs/mq_r/board.dts
修改Uboot的设备树：Tina-Linux/device/config/chips/t113/configs/mq_r/uboot-board.dts

原版的：我的五寸屏幕会闪屏，需要修改适配！

 当我们配置并行 RGB 接口时，在配置里面并不需要区分是 24 位，18 位和 16 位，最大位宽是哪种是参考 pin mux 表格，如果 LCD 屏本身支持的位宽比 SoC 支持的位宽少，当然只能选择少的一方。

 因为不需要初始化，RGB 接口极少出现问题，重点关注 lcd 的 timing 的合理性，也就是lcd_ht，lcd_hspw，lcd_hbp，lcd_vt，lcd_vspw和lcd_vbp这个属性的合理性。

&lcd0 {
/* part 1 */
lcd_used = <1>;
lcd_driver_name = "default_lcd";/* part 2 */
lcd_if = <0>;
lcd_hv_if = <0>;/* part 3 */
lcd_width = <150>;
lcd_height = <94>;
lcd_x = <800>;
lcd_y = <480>;
lcd_dclk_freq = <33>;
lcd_hbp = <46>;
lcd_ht = <1055>;
lcd_hspw = <0>;
lcd_vbp = <23>;
lcd_vt = <525>;
lcd_vspw = <0>;/* part 4 */
lcd_backlight = <50>;
lcd_pwm_used = <1>;
lcd_pwm_ch = <8>;
lcd_pwm_freq = <10000>;
lcd_pwm_pol = <1>;
lcd_bl_en = <&pio PD 27 1 0 3 1>;
lcd_bright_curve_en = <0>;/* part 5 */
lcd_frm = <0>;
lcd_io_phase = <0x0000>;
lcd_gamma_en = <0>;
lcd_cmap_en = <0>;
lcd_hv_clk_phase = <0>;
lcd_hv_sync_polarity= <0>;/* part 6 */
lcd_power = "vcc-lcd";
lcd_pin_power = "vcc-pd";
pinctrl-0 = <&rgb24_pins_a>;
pinctrl-1 = <&rgb24_pins_b>;
};

上面是典型并行 RGB 接口 board.dts 配置示例，其中用空行把配置分成几个部分

1. 第一部分，决定该配置是否使用，以及使用哪个屏驱动，lcd_driver_name 决定了用哪个屏驱动来初始化，这里是 default_lcd，是针对不需要初始化设置的 RGB 屏
2. 第二部分决定下面的配置是一个并行 RGB 的配置。
3. 第三部分决定了 SoC 中的 LCD 模块发送时序，请查看屏时序参数说明。
4. 第四部分决定了背光（pwm 和 lcd_bl_en）。请看背光相关参数。
5. 第五部分是显示效果部分的配置，如果非 24 位的 RGB，那么一般情况下需要设置lcd_frm。
6. 第六部分就是电源和管脚配置。是用 RGB666 还是 RGB888，需要根据实际 pinmux 表来决定，如果该芯片只有 18 根 rgb 数据则只能 rgb18。请看电源和管脚参数。

屏幕参数：

照着屏幕规格书写的设备树：

&lcd0 {lcd_used            = <1>;            // 启用lcdlcd_driver_name     = "default_lcd";  // 使用 default_lcd 驱动lcd_backlight       = <50>;lcd_if              = <0>;            // 0:rgb 4:dsi// Part 1lcd_x               = <800>;          // 宽度lcd_y               = <480>;		  // 高度lcd_width           = <108>;          // 屏幕物理宽度，单位 mmlcd_height          = <65>;           // 屏幕物理高度，单位 mm// Part 2lcd_pwm_used        = <1>;            // 启用背光 PWMlcd_pwm_ch          = <7>;            // 使用 PWM 通道 7lcd_pwm_freq        = <50000>;         // PWM 频率，单位 Hzlcd_pwm_pol         = <0>;            // 背光 PWM 的极性lcd_pwm_max_limit   = <255>;          // 背光 PWM 的最大值（<=255）// Part 3 lcd_dclk_freq       = <29>;           // 屏幕时钟，单位 MHzlcd_ht              = <928>;          // hsync total cycle(pixel)lcd_hbp             = <88>;           // hsync back porch(pixel) + hsync plus width(pixel);lcd_hspw            = <48>;           // hsync plus width(pixel)lcd_vt              = <525>;          // vsync total cycle(line)lcd_vbp             = <32>;           // vsync back porch(line) + vysnc plus width(line)lcd_vspw            = <1>;            // vsync plus width(pixel)// Part 4lcd_lvds_if         = <0>;lcd_lvds_colordepth = <1>;lcd_lvds_mode       = <0>;lcd_frm             = <0>;            // 0:关闭; 1:启用rgb666抖动; 2:启用rgb656抖动lcd_io_phase        = <0x0000>;lcd_gamma_en        = <0>;lcd_bright_curve_en = <0>;lcd_cmap_en         = <0>;deu_mode            = <0>;lcdgamma4iep        = <22>;smart_color         = <90>;// Part 5pinctrl-0 = <&rgb18_pins_a>;pinctrl-1 = <&rgb18_pins_b>;
};

/Tina-Linux/lichee/linux-5.4/arch/arm/boot/dts/sun8iw20p1.dtsi

rgb18_pins_a: rgb18@0 {pins = "PD0", "PD1", "PD2", "PD3", "PD4", "PD5", \"PD6", "PD7", "PD8", "PD9", "PD10", "PD11", \"PD12", "PD13", "PD14", "PD15", "PD16", "PD17", \"PD18", "PD19", "PD20", "PD21";function = "lcd0";drive-strength = <30>;bias-disable;};rgb18_pins_b: rgb18@1 {pins = "PD0", "PD1", "PD2", "PD3", "PD4", "PD5", \"PD6", "PD7", "PD8", "PD9", "PD10", "PD11", \"PD12", "PD13", "PD14", "PD15", "PD16", "PD17", \"PD18", "PD19", "PD20", "PD21";function = "io_disabled";bias-disable;};

调试LCD

满屏雪花

cat /dev/urandom > /dev/fb0

清屏

cat /dev/zero > /dev/fb0

测试色条显示

echo 8 > /sys/class/disp/disp/attr/colorbar

适配电容触摸屏

我的屏幕的电容屏芯片是汇顶：GT911

配置内核模块

make kernel_menuconfig

Device Drivers  ---> Input device support  --->[*]   Touchscreens  ---><*>   Goodix I2C touchscreen<*>   gt9xxnew touchscreen driver

配置Kernel的设备树

根据原理图修改一下中断引脚和复位引脚如下：

&twi2 {clock-frequency = <400000>;pinctrl-0 = <&twi2_pins_a>;pinctrl-1 = <&twi2_pins_b>;pinctrl-names = "default", "sleep";dmas = <&dma 45>, <&dma 45>;dma-names = "tx", "rx";status = "okay";/* pcf8574-usage:* only use gpio0~7, 0 means PP0.* pin set:* gpios = <&pcf8574 0 GPIO_ACTIVE_LOW>;* interrupt set:* interrupt-parent = <&pcf8574>;* interrupts = <0 IRQ_TYPE_EDGE_FALLING>;*/pcf8574: gpio@38 {compatible = "nxp,pcf8574";reg = <0x38>;gpio_base = <2020>;gpio-controller;#gpio-cells = <2>;interrupt-controller;#interrupt-cells = <2>;interrupt-parent = <&pio>;interrupts = <PB 2 IRQ_TYPE_EDGE_FALLING>;status = "disabled";};ctp@14 {compatible = "allwinner,goodix";device_type = "ctp";reg = <0x14>;status = "okay";ctp_name = "gt9xxnew_ts";ctp_twi_id = <0x2>;ctp_twi_addr = <0x14>;ctp_screen_max_x = <0x320>;ctp_screen_max_y = <0x1e0>;ctp_revert_x_flag = <0x0>;ctp_revert_y_flag = <0x0>;ctp_exchange_x_y_flag = <0x0>;ctp_int_port = <&pio PB 3 GPIO_ACTIVE_HIGH>; // 中断ctp_wakeup = <&pio PB 2 GPIO_ACTIVE_HIGH>; // 复位};
};

配置文件系统

make menuconfig

Libraries  ---><*> tslib......... tslib is an abstraction layer for touchscreen panel events

上电信息

[    3.190476] get ctp_power is fail, -22
[    3.194658] get ctp_power_ldo_vol is fail, -22
[    3.199665] sunxi_ctp_startup: ctp_power_io is invalid.
[    3.205523] get ctp_gesture_wakeup fail, no gesture wakeup
[    3.211672] gt9xxnew_ts 2-0014: 2-0014 supply ctp not found, using dummy regulator
[    3.409439] input: gt9xxnew_ts as /devices/virtual/input/input1

设备节点

$ ls /dev/input/
event0  event1  event2  mice