RK3288 显示屏
在[RK3288][Android6.0] 上怎样去添加eDP显示屏呢?
如何对[RK3288][Android6.0] 上的eDP显示屏进行配置呢?
回帖(1)
2022-3-10 10:44:03
Platform: RK3288
OS: Android 6.0
Kernel: 3.10.92
不得不说从 RGB -> LVDS -> MIPI -> eDP 一路过来,现在的屏接口速率越来越高,
集成化程度也越来越高. 从并口变成串口, 到eDP连clock也集成在Tx Lane中.
原理图屏相关部分:
1. 连接Lanes为4,软件中已经固定了.
2. 电源有VDD10_LCD, VCC18_LCD两个, 前者开机后就有,后者通过LCD_EN控制.
3. LCD_EN对应的GPIO是GPIO7_A3.
屏的关键参数:
分辨率和位深:
时序参数:
dts配置:
eDP的配置相当简单, 只要配置display-timing即可,另外,前面的LCD_EN引脚也要配置下.
GPIO7_A3:
&lcdc0 {
status = "okay";
rockchip,mirror = ;
rockchip,cabc_mode = <0>;
power_ctr: power_ctr {
rockchip,debug = <0>;
lcd_en:lcd_en {
rockchip,power_type = ;
gpios = <&gpio7 GPIO_A3 GPIO_ACTIVE_HIGH>;
rockchip,delay = <10>;
};
};
};
timing:
这部分可以参考lcd-LP097QX1.dtsi
/ {
disp_timings: display-timings {
native-mode = <&timing0>;
timing0: timing0 {
screen-type = ;
out-face = ;
clock-frequency = <138700000>;
hactive = <1920>;
vactive = <1080>;
hback-porch = <35>;
hfront-porch = <120>;
vback-porch = <10>;
vfront-porch = <20>;
hsync-len = <5>;
vsync-len = <2>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <0>;
pixelclk-active = <1>;
swap-rb = <0>;
swap-rg = <0>;
swap-gb = <0>;
};
};
};
背光部分:
backlight {
compatible = "pwm-backlight";
pwms = <&pwm0 0 25000>;
brightness-levels = <255 254 253 252 251 250 249 248 247 246 245 244 243 242 241 240
239 238 237 236 235 234 233 232 231 230 229 228 227 226 225 224 223 222 221 220
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 = <200>;
enable-gpios = <&gpio7 GPIO_A2 GPIO_ACTIVE_HIGH>;
};
Platform: RK3288
OS: Android 6.0
Kernel: 3.10.92
不得不说从 RGB -> LVDS -> MIPI -> eDP 一路过来,现在的屏接口速率越来越高,
集成化程度也越来越高. 从并口变成串口, 到eDP连clock也集成在Tx Lane中.
原理图屏相关部分:
1. 连接Lanes为4,软件中已经固定了.
2. 电源有VDD10_LCD, VCC18_LCD两个, 前者开机后就有,后者通过LCD_EN控制.
3. LCD_EN对应的GPIO是GPIO7_A3.
屏的关键参数:
分辨率和位深:
时序参数:
dts配置:
eDP的配置相当简单, 只要配置display-timing即可,另外,前面的LCD_EN引脚也要配置下.
GPIO7_A3:
&lcdc0 {
status = "okay";
rockchip,mirror = ;
rockchip,cabc_mode = <0>;
power_ctr: power_ctr {
rockchip,debug = <0>;
lcd_en:lcd_en {
rockchip,power_type = ;
gpios = <&gpio7 GPIO_A3 GPIO_ACTIVE_HIGH>;
rockchip,delay = <10>;
};
};
};
timing:
这部分可以参考lcd-LP097QX1.dtsi
/ {
disp_timings: display-timings {
native-mode = <&timing0>;
timing0: timing0 {
screen-type = ;
out-face = ;
clock-frequency = <138700000>;
hactive = <1920>;
vactive = <1080>;
hback-porch = <35>;
hfront-porch = <120>;
vback-porch = <10>;
vfront-porch = <20>;
hsync-len = <5>;
vsync-len = <2>;
hsync-active = <0>;
vsync-active = <0>;
de-active = <0>;
pixelclk-active = <1>;
swap-rb = <0>;
swap-rg = <0>;
swap-gb = <0>;
};
};
};
背光部分:
backlight {
compatible = "pwm-backlight";
pwms = <&pwm0 0 25000>;
brightness-levels = <255 254 253 252 251 250 249 248 247 246 245 244 243 242 241 240
239 238 237 236 235 234 233 232 231 230 229 228 227 226 225 224 223 222 221 220
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 = <200>;
enable-gpios = <&gpio7 GPIO_A2 GPIO_ACTIVE_HIGH>;
};
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