在arch/arm/configs/fireprime_defconfig添加配置:
CONFIG_LCD_MIPI=y CONFIG_MIPI_DSI=y CONFIG_RK32_MIPI_DSI=y
在arch/arm/boot/dts/目录中新建dst配置文件,如lcd-xxx-mipi.dtsi。
在arch/arm/boot/dts/rk3128-fireprime.dts中添加#include “lcd-xxx-mipi.dtsi”,如果原来include了其他屏的DTS配置,注释掉它们。使用MIPI屏显示,需要关闭tve的使能:
&tve { status = "disabled"; test_mode = <0>; };
在lcd-xxx-mipi.dtsi中添加背光节点信息。
backlight { compatible = "pwm-backlight"; pwms = <&pwm0 0 25000>; rockchip,pwm_id= <1>; /* | dark(255-221) | light scale(220-0) | , scale_div=255*/ brightness-levels = 255 254 253 252 251 250 249 248 247 246 245 244 243 242 241 240 239 238 237 236 235 234 233 232 231 230 229 228 227 266 225 224 223 222 221 */220 219 218 217 216 215 214 213 212 211 210 209 208 207 206 205 204 203 202 201 200 199 198 197 196 195 194 193 192 191 190 189 188 187 186 185 184 183 182 181 180 179 178 177 176 175 174 173 172 171 170 169 168 167 166 165 164 163 162 161 160 159 158 157 156 155 154 153 152 151 150 149 148 147 146 145 144 143 142 141 140 139 138 137 136 135 134 133 132 131 130 129 128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0>; default-brightness-level = <180>; enable-gpios = <&gpio1 GPIO_A7 GPIO_ACTIVE_HIGH>; };
具体请参考kernel中的说明文档:
Documentation/devicetree/bindings/video/backlight/pwm-backlight.txt
在lcd-xxx-mipi.dtsi中添加MIPI配置信息
disp_mipi_init: mipi_dsi_init{ compatible = "rockchip,mipi_dsi_init"; rockchip,screen_init = <1>; rockchip,dsi_lane = <4>; rockchip,dsi_hs_clk = <500>; rockchip,mipi_dsi_num = <1>; };
具体请参考kernel中的说明文档:
Documentation/devicetree/bindings/video/rockchip_mipidsi_lcd.txt
在lcd-xxx-mipi.dtsi中添加引脚配置信息
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_B0 GPIO_ACTIVE_LOW>; rockchip,delay = <10>; }; /* mipi_lcd_en:mipi_lcd_en { compatible = "rockchip,lcd_en"; rockchip,gpios = <&gpio0 GPIO_C1 GPIO_ACTIVE_HIGH>; rockchip,delay = <10>; };*/ };
disp_mipi_power_ctr分别有电源使能引脚mipi_lcd_en、片选引脚mipi_lcd_cs,复位引脚mipi_lcd_rst,可以根据显示屏做修改和删减。
在lcd-xxx-mipi.dtsi中添加初始化命令信息
disp_mipi_init_cmds: screen-on-cmds { rockchip,cmd_debug = <0>; compatible = "rockchip,screen-on-cmds"; rockchip,on-cmds1 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = <LPDT>; rockchip,dsi_id = <0>; rockchip,cmd = <0x05 0x29>; rockchip,cmd_delay = <0>; }; rockchip,on-cmds2 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = <LPDT>; rockchip,dsi_id = <0>; rockchip,cmd = <0x05 0x11>; rockchip,cmd_delay = <200>; }; };
当rockchip,screen_init为1时需要配置显示屏的初始化命令,初始化命令在节点disp_mipi_init_cmds中配置。
在lcd-xxx-mipi.dtsi中添加显示时序信息
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_P666>; color-mode = <COLOR_RGB>; clock-frequency = <67000000>; hactive = <768>; vactive = <1024>; hsync-len = <64>; hback-porch = <56>; hfront-porch = <60>; vsync-len = <14>; vback-porch = <30>; vfront-porch = <36>; hsync-active = <0>; vsync-active = <0>; de-active = <0>; pixelclk-active = <1>; swap-rb = <0>; swap-rg = <0>; swap-gb = <0>; }; };
其他的时序属性参考下图:
单MIPI屏,需要使能dsihost0,如:
&dsihost0 { status = "okay"; };
全部0条评论
快来发表一下你的评论吧 !