3. Display 使用¶
RK3506 拥有 1 路 Video 输出端口。Video Port 所能输出的最大分辨率：1280x1280@60Hz。
3.1. ROC-RK3506J-CC 显示接口的配置¶
下面对各个显示输出接口的配置和使用作基本的介绍，详细内容可以参考文件：
kernel/arch/arm/boot/dts/rk3506b-firefly-roc-rk3506b-cc.dtskernel/arch/arm/boot/dts/rk3506b-firefly-roc-rk3506b-cc-mipi101-BSD1218-A101KL68.dtsi
3.1.1. MIPI DSI¶
ROC-RK3506J-CC 有一路 MIPI DSI 显示输出接口，支持 2 Lane 的数据输出，最高可输出 1280x1280@60Hz 。
3.1.1.1. 软件配置¶
外接的屏幕是 Firefly V3 版本屏幕，
DSI 接口
在设备树上添加：
//设置屏幕的背光
backlight: backlight {
...
compatible = "pwm-backlight";
enable-gpios = <&pca9555 PCA_IO0_1 GPIO_ACTIVE_HIGH>;
pwms = <&pwm0_4ch_2 0 50000 1>;
status = "okay";
...
}
&pwm0_4ch_2 {
pinctrl-names = "active";
pinctrl-0 = <&rm_io3_pwm0_ch2>;
status = "okay";
};
//设置 dsi 的开机 logo
&dsi_dphy {
status = "okay";
};
&dsi_in {
status = "okay";
};
&dsi_in_vop {
status = "okay";
};
&route_dsi {
status = "okay";
};
//打开 dsi（注意这一部分较重要，涉及到屏幕的上电时序）
&dsi {
status = "okay";
//rockchip,lane-rate = <1000>;
dsi_panel: panel@0 {
status = "okay";
compatible = "simple-panel-dsi";
reg = <0>;
backlight = <&backlight>;
enable-gpios = <&pca9555 PCA_IO0_0 GPIO_ACTIVE_HIGH>;
reset-gpios = <&pca9555 PCA_IO0_2 GPIO_ACTIVE_LOW>;
enable-delay-ms = <50>;
prepare-delay-ms = <200>;
reset-delay-ms = <50>;
init-delay-ms = <55>;
unprepare-delay-ms = <50>;
disable-delay-ms = <20>;
mipi-data-delay-ms = <200>;
size,width = <120>;
size,height = <170>;
dsi,flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET)>;
dsi,format = <MIPI_DSI_FMT_RGB888>;
dsi,lanes = <2>;
panel-init-sequence = [
39 00 04 FF 98 81 03
15 00 02 01 00
15 00 02 02 00
15 00 02 03 55
15 00 02 04 55
15 00 02 05 03
15 00 02 06 06
15 00 02 07 00
15 00 02 08 07
15 00 02 09 00
15 00 02 0a 00
15 00 02 0b 00
15 00 02 0c 00
15 00 02 0d 00
15 00 02 0e 00
15 00 02 0f 00
15 00 02 10 00
15 00 02 11 00
15 00 02 12 00
15 00 02 13 00
15 00 02 14 00
15 00 02 15 00
15 00 02 16 00
15 00 02 17 00
15 00 02 18 00
15 00 02 19 00
15 00 02 1a 00
15 00 02 1b 00
15 00 02 1c 00
15 00 02 1d 00
15 00 02 1e C0
15 00 02 1f 80
15 00 02 20 04
15 00 02 21 03
15 00 02 22 00
15 00 02 23 00
15 00 02 24 00
15 00 02 25 00
15 00 02 26 00
15 00 02 27 00
15 00 02 28 33
15 00 02 29 33
15 00 02 2a 00
15 00 02 2b 00
15 00 02 2c 00
15 00 02 2d 00
15 00 02 2e 00
15 00 02 2f 00
15 00 02 30 00
15 00 02 31 00
15 00 02 32 00
15 00 02 33 00
15 00 02 34 04
15 00 02 35 00
15 00 02 36 00
15 00 02 37 00
15 00 02 38 3C
15 00 02 39 00
15 00 02 3a 00
15 00 02 3b 00
15 00 02 3c 00
15 00 02 3d 00
15 00 02 3e 00
15 00 02 3f 00
15 00 02 40 00
15 00 02 41 00
15 00 02 42 00
15 00 02 43 00
15 00 02 44 00
15 00 02 50 00
15 00 02 51 11
15 00 02 52 44
15 00 02 53 55
15 00 02 54 88
15 00 02 55 AB
15 00 02 56 00
15 00 02 57 11
15 00 02 58 22
15 00 02 59 33
15 00 02 5a 44
15 00 02 5b 55
15 00 02 5c 66
15 00 02 5d 77
15 00 02 5e 00
15 00 02 5f 02
15 00 02 60 02
15 00 02 61 0A
15 00 02 62 09
15 00 02 63 08
15 00 02 64 13
15 00 02 65 12
15 00 02 66 11
15 00 02 67 10
15 00 02 68 0F
15 00 02 69 0E
15 00 02 6a 0D
15 00 02 6b 0C
15 00 02 6c 06
15 00 02 6d 07
15 00 02 6e 02
15 00 02 6f 02
15 00 02 70 02
15 00 02 71 02
15 00 02 72 02
15 00 02 73 02
15 00 02 74 02
15 00 02 75 02
15 00 02 76 02
15 00 02 77 0A
15 00 02 78 06
15 00 02 79 07
15 00 02 7a 10
15 00 02 7b 11
15 00 02 7c 12
15 00 02 7d 13
15 00 02 7e 0C
15 00 02 7f 0D
15 00 02 80 0E
15 00 02 81 0F
15 00 02 82 09
15 00 02 83 08
15 00 02 84 02
15 00 02 85 02
15 00 02 86 02
15 00 02 87 02
15 00 02 88 02
15 00 02 89 02
15 00 02 8A 02
39 00 04 FF 98 81 04
15 00 02 6E 2A
15 00 02 6F 37
15 00 02 3A 24
15 00 02 8D 19
15 00 02 87 BA
15 00 02 B2 D1
15 00 02 88 0B
15 00 02 38 01
15 00 02 39 00
15 00 02 B5 02
15 00 02 31 25
15 00 02 3B 98
39 00 04 FF 98 81 01
15 00 02 22 0A
15 00 02 31 0C
15 00 02 53 40
15 00 02 55 45
15 00 02 50 B7
15 00 02 51 B2
15 00 02 60 07
15 00 02 B7 03
15 00 02 A0 22
15 00 02 A1 3F
15 00 02 A2 4E
15 00 02 A3 17
15 00 02 A4 1A
15 00 02 A5 2D
15 00 02 A6 21
15 00 02 A7 22
15 00 02 A8 C4
15 00 02 A9 1B
15 00 02 AA 25
15 00 02 AB A7
15 00 02 AC 1A
15 00 02 AD 19
15 00 02 AE 4B
15 00 02 AF 1F
15 00 02 B0 2A
15 00 02 B1 59
15 00 02 B2 64
15 00 02 B3 3F
15 00 02 C0 22
15 00 02 C1 48
15 00 02 C2 59
15 00 02 C3 15
15 00 02 C4 15
15 00 02 C5 28
15 00 02 C6 1C
15 00 02 C7 1E
15 00 02 C8 C4
15 00 02 C9 1C
15 00 02 CA 2B
15 00 02 CB A3
15 00 02 CC 1F
15 00 02 CD 1E
15 00 02 CE 52
15 00 02 CF 24
15 00 02 D0 2A
15 00 02 D1 58
15 00 02 D2 68
15 00 02 D3 3F
39 00 04 FF 98 81 00
05 78 01 11 //Delay 120ms
05 14 01 29 //Delay 20ms
];
panel-exit-sequence = [
39 00 04 FF 98 81 00 //page0
05 14 01 28 //Delay 20ms
05 78 01 10 //Delay 120ms
];
dis1_timings0: display-timings {
native-mode = <&dsi_timing0>;
dsi_timing0: timing0 {
clock-frequency = <70000000>;//<80000000>;
hactive = <800>;//<768>;
vactive = <1280>;
hsync-len = <20>; //20, 50,10
hback-porch = <20>; //50, 56,10
hfront-porch = <40>;//50, 30,180
vsync-len = <4>;//4
vback-porch = <20>;//4
vfront-porch = <20>;//8
hsync-active = <0>;
vsync-active = <0>;
de-active = <0>;
pixelclk-active = <0>;
};
};
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
panel_in_dsi: endpoint {
remote-endpoint = <&dsi_out_panel>;
};
};
};
};
ports {
#address-cells = <1>;
#size-cells = <0>;
port@1 {
reg = <1>;
dsi_out_panel: endpoint {
remote-endpoint = <&panel_in_dsi>;
};
};
};
};
//使能屏幕的触摸功能
&i2c0 {
//clock-frequency = <400000>;
pinctrl-names = "default";
status = "okay";
goodix_ts@14 {
status = "okay";
compatible = "goodix,gt9xxx";
reg = <0x14>;
interrupt-parent = <&gpio0>;
interrupts = <RK_PB6 IRQ_TYPE_LEVEL_LOW>;
//goodix,pwr-gpio = <&pca9555 PCA_IO0_7 GPIO_ACTIVE_HIGH>;
reset-gpios = <&pca9555 PCA_IO0_3 GPIO_ACTIVE_HIGH>;
irq-gpios = <&gpio0 RK_PB6 IRQ_TYPE_LEVEL_LOW>;
irq-flags = <2>; /* 1 rising, 2 falling */
touchscreen-size-x = <800>;
touchscreen-size-y = <1280>;
goodix,slide-wakeup = <0>;
goodix,type-a-report = <0>;
goodix,driver-send-cfg = <1>;
goodix,resume-in-workqueue = <0>;
goodix,int-sync = <1>;
//goodix,swap-x2y = <0>;
goodix,esd-protect = <1>;
goodix,auto-update-cfg = <0>;
goodix,auto-update = <0>;
goodix,power-off-sleep = <0>;
goodix,pen-suppress-finger = <0>;
goodix,cfg-group2 = [
62 20 03 00 05 0A 35 00 01
0A 28 0F 50 3C 03 05 00 00
00 00 00 00 06 18 1A 1E 14
90 30 AA 37 39 12 0C 00 00
00 1A 02 2D 00 00 00 00 00
00 00 00 07 00 00 28 4B 94
D5 02 07 00 00 04 9A 2A 00
8C 30 00 81 36 00 76 3E 00
6E 46 00 6E 00 00 00 00 00
00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00
00 00 00 00 00 02 00 00 00
00 00 00 00 19 18 17 16 15
14 11 10 0F 0E 0D 0C 09 08
07 06 05 04 01 00 00 00 00
00 00 00 00 00 00 00 14 13
12 11 10 0F 0E 0D 0C 0A 08
07 06 04 02 00 19 1B 1C 1E
1F 20 21 22 23 24 25 26 27
28 29 2A 00 00 00 00 00 00
00 00 00 00 D8 01];
};
};
在配置 MIPI DSI的时候，如果出现异常现象，如黑屏，画面拉伸，显示有噪点等，需要注意排查：
显示时序是否配置正确，尤其是 DCLK 的配置。
上下电时序是否正确，在文件
kernel/drivers/gpu/drm/panel/panel-simple.c中的panel_simple_prepare和panel_simple_unprepare函数内，调用了设备树中所配置的上下电时序和 gpio 口。如果选择在 uboot 阶段开启开机 logo, 那么还需要排查
u-boot/drivers/video/drm/rockchip_panel.c文件内的panel_simple_prepare和panel_simple_unprepare函数。搭示波器看一下上电时序是否正确，主要是确认 LCD 使能引脚、复位引脚和屏幕上电指令间的时序是否正确。
3.2. 调试手段¶
获取系统中正在使用的 Video Port（与所连接的显示控制器） 信息
root@rk3506-buildroot:/# cat /sys/kernel/debug/dri/0/summary
VOP [ff600000.vop]: ACTIVE
Connector: DSI-1
bus_format[100a]: RGB888_1X24
overlay_mode[0] output_mode[0]color-encoding[1] color-range[1]
Display mode: 800x1280p60
dclk[70000 kHz] real_dclk[69475 kHz] aclk[294912 kHz] type[48] flag[a]
H: 800 840 860 880
V: 1280 1300 1304 1324
win1-0: ACTIVE
format: XR24 little-endian (0x34325258) SDR[0] color-encoding[0] color-range[0]
csc: y2r[0] r2r[0] r2y[0] csc mode[0]
zpos: 0
src: pos[0x0] rect[800x1280]
dst: pos[0x0] rect[800x1280]
buf[0]: addr: 0x1e000000 pitch: 3200 offset: 0
post: sdr2hdr[0] hdr2sdr[0]
pre : sdr2hdr[0]
post CSC: r2y[0] y2r[0] CSC mode[2]
一般如果遇到屏幕无法显示的问题，都需要先执行上面的命令去看一下连接状态和分辨率是否正确。