屏幕接口类型
- LVDS: Low-Voltage Differential Signaling
- Dual LVDS
- MIPI: Mobile Industry Processor Interface
- HDMI: High Definition Multimedia Interface
rk3288 dts
kernel/arch/arm/boot/dts/rk3288-*.dts
&lvds_panel {
status = "okay";
compatible ="simple-panel";
backlight = <&backlight>;
bus-format = <MEDIA_BUS_FMT_RGB888_1X24>;
enable-gpios = <&gpio7 2 GPIO_ACTIVE_HIGH>;
enable-delay-ms = <10>;
power-supply = <&vcc_lcd>;
rockchip,data-mapping = "vesa";
rockchip,data-width = <24>;
rockchip,output = "duallvds";
display-timings {
native-mode = <&timing0>;
timing0: timing0 {
clock-frequency = <148500000>;
hactive = <1920>;
vactive = <1080>;
hback-porch = <30>;
hfront-porch = <220>;
vback-porch = <10>;
vfront-porch = <25>;
hsync-len = <30>;
vsync-len = <10>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <0>;
pixelclk-active = <0>;
};
};
};
参数解释
status:okay 状态
compatible:simple-panel 与 lvds panel 驱动进行匹配
backlight: &backlight 引用背光节点， panel 驱动会解析并对背光进行控制
enable-gpios: &gpio7 3 GPIO_ACTIVE_HIGH 屏的 enable 脚的 gpio 配置，参考原理图。
enable-delay-ms: 10 开启背光之前的延时，参考屏规格书
rockchip,data-mapping: vesa or jeida LVDS 信号的两种编码方式
rockchip,data-width:18 or 24 or 30 LVDS 的数据位， RGB 三个分量都是 6bit 的填 18，RGB 三个分量都是 8bit 的填 24，RGB 三个分量都是 10bit 的填 30。
rockchip,output: lvds or duallvds 双通道 LVDS， 目前只有 rk3288 支持
clock-frequency：dclk 频率，单位为 Hz，一般屏的规格书中有，也可以通过公式计算：H*V（包括同步信号）*fps
Hactive：水平有效像素
Vactive：垂直有效像素
U盘参数
# 0 - DSI; 1 - eDP; 2 - LVDS;
panel-type = 2;
# panel info
unprepare-delay-ms = 100;
enable-delay-ms = 100;
disable-delay-ms = 100;
prepare-delay-ms = 100;
reset-delay-ms = 100;
init-delay-ms = 100;
width-mm = 100;
height-mm = 100;
# panel timing
clock-frequency = 148500000;
hactive = 1920;
vactive = 1080;
hback-porch = 30;
hfront-porch = 220;
vback-porch = 10;
vfront-porch = 25;
hsync-len = 30;
vsync-len = 10;
hsync-active = 0;
vsync-active = 0;
de-active = 0;
pixelclk-active = 0;
## rockchip_display.c
u-boot/drivers/video/rockchip_display.c
```c
enum {
PANEL_TYPE_DSI,
PANEL_TYPE_EDP,
PANEL_TYPE_LVDS,
};
lcdparamservice.c
#define LCD_PARAMETE_FILE_PATH "busybox find /mnt/media_rw/ -name wif_rk_parameters"
#define OEM_PARTITIOM_NODE_PATH "/dev/block/platform/ff0f0000.dwmmc/by-name/oem"
/*#define OEM_PARTITIOM_NODE_PATH "data/oem"*/
/*#define RKNAND_GET_VENDOR_SECTOR0 _IOW('v', 16, unsigned int)*/
/*#define RKNAND_STORE_VENDOR_SECTOR0 _IOW('v', 17, unsigned int)*/
#define RKNAND_SYS_STORGAE_DATA_LEN 512 //oem size
/*#define VENDOR_SECTOR_OP_TAG 0x444E4556 // "VEND"*/
#define POLY 0xEDB88320L //CRC stand
#define CONFIG_NUM 26
char *key[CONFIG_NUM] =
{
"panel-type",
"unprepare-delay-ms",
"enable-delay-ms",
"disable-delay-ms",
"prepare-delay-ms",
"reset-delay-ms",
"init-delay-ms",
"width-mm",
"height-mm",
"clock-frequency",
"hactive",
"hfront-porch",
"hsync-len",
"hback-porch",
"vactive",
"vfront-porch",
"vsync-len",
"vback-porch",
"hsync-active",
"vsync-active",
"de-active",
"pixelclk-active",
"dsi,flags",
"dsi,format",
"dsi,lanes",
"panel-init-sequence"
};
MIPI
&dsi0 {
status = "okay";
rockchip,lane-rate = <600>;
panel: panel {
compatible = "simple-panel-dsi";
reg = <0>;
backlight = <&backlight>;
reset-gpios = <&gpio7 3 GPIO_ACTIVE_LOW>;
dsi,flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM)>;
dsi,format = <MIPI_DSI_FMT_RGB888>;
dsi,lanes = <4>;
bus-format = <MEDIA_BUS_FMT_RBG888_1X24>;
reset-delay-ms = <20>;
init-delay-ms = <20>;
enable-delay-ms = <20>;
prepare-delay-ms = <20>;
unprepare-delay-ms = <20>;
status = "okay";
panel-init-sequence = [
39 00 03 F0 5A 5A
39 00 03 F1 A5 A5
39 00 03 F0 B4 4B
39 00 03 C2 83 10
39 00 0D B0 ba 98 ba 98 33 33 33 33 2a 00 84 00
39 00 09 B1 93 94 02 89 2a 01 84 01
39 00 12 B7 01 01 09 11 0D 15 19 0D 21 1D 00 00 20 00 02 ff 3c
39 00 07 BD 4E 0E 4B 4B 20 1A
39 00 06 B8 24 01 30 34 55
39 00 06 C7 05 23 6B 49 00
39 00 09 C6 00 00 FF 00 00 FF 00 00
39 00 04 C3 22 61 04
39 00 17 B3 1C 1C 05 05 07 07 1D 1D 23 03 22 22 03 13 13 11 11 0F 0F 0D 0D 00
39 00 17 B4 1C 1C 04 04 06 06 1D 1D 23 03 22 22 03 12 12 10 10 0E 0E 0C 0C 00
39 00 04 d0 07 ff ff
39 00 05 D2 63 0B 08 88
39 00 27 C8 7E 60 52 45 42 32 37 22 3C 3B 3B 5B 4B 54 47 44 37 25 0C 7C 62 52 46 42 32 37 22 3B 3B 3A 5B 4B 54 47 44 37 25 0C
05 78 01 11
05 32 01 29
];
panel-exit-sequence=[
05 78 01 28
05 78 01 10
];
disp_timings: display-timings {
native-mode = <&timing0>;
timing0: timing0 {
clock-frequency = <87000000>;
hactive = <800>;
vactive = <1280>;
hback-porch = <80>;
hfront-porch = <80>;
vback-porch = <24>;
vfront-porch = <16>;
hsync-len = <20>;
vsync-len = <8>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <0>;
pixelclk-active = <0>;
};
};
};
};
&route_dsi0 {
status = "okay";
};
