Radxa CM3 IO LVDS

#1

I am using Rock3 compute module io board, I have display with LVDS interface, on LCD_1 connector, does anyone have any idea how to set the dts?

#2

Hello, have you found a solution? We have the same problem

thank you in advance
Diego

#3

Hello diego,

yes i solved:
in the file rk3566-radxa-cm3-io.dts include
#include “radxa-cm3-io-lvds.dtsi”
and create new file radxa-cm3-io-lvds.dtsi

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*

  • Copyright © 2022 Radxa Limited.

*/
#include <dt-bindings/display/media-bus-format.h>

/ {

  //compatible = "radxa,radxa-cm3-io", "rockchip,rk3566";
  compatible = "rockchip,rk3568";

backlight_lvds: backlight-lvds {
status = “okay”;
compatible = “pwm-backlight”;
pwms = <&pwm13 0 25000 1>;
brightness-levels = <
0 20 20 21 21 22 22 23
23 24 24 25 25 26 26 27
27 28 28 29 29 30 30 31
31 32 32 33 33 34 34 35
35 36 36 37 37 38 38 39
40 41 42 43 44 45 46 47
48 49 50 51 52 53 54 55
56 57 58 59 60 61 62 63
64 65 66 67 68 69 70 71
72 73 74 75 76 77 78 79
80 81 82 83 84 85 86 87
88 89 90 91 92 93 94 95
96 97 98 99 100 101 102 103
104 105 106 107 108 109 110 111
112 113 114 115 116 117 118 119
120 121 122 123 124 125 126 127
128 129 130 131 132 133 134 135
136 137 138 139 140 141 142 143
144 145 146 147 148 149 150 151
152 153 154 155 156 157 158 159
160 161 162 163 164 165 166 167
168 169 170 171 172 173 174 175
176 177 178 179 180 181 182 183
184 185 186 187 188 189 190 191
192 193 194 195 196 197 198 199
200 201 202 203 204 205 206 207
208 209 210 211 212 213 214 215
216 217 218 219 220 221 222 223
224 225 226 227 228 229 230 231
232 233 234 235 236 237 238 239
240 241 242 243 244 245 246 247
248 249 250 251 252 253 254 255
>;
default-brightness-level = <50>;
enable-gpios = <&gpio4 RK_PA3 GPIO_ACTIVE_HIGH>;
};

      vcc3v3_lcd_lvds: vcc3v3-lcd-lvds {
              status = "okay";
              compatible = "regulator-fixed";
             	gpio = <&gpio0 RK_PD5 GPIO_ACTIVE_HIGH>;
              enable-active-high;
              regulator-name = "vcc3v3_lcd_lvds";
              regulator-boot-on;
              regulator-state-mem {
                      regulator-off-in-suspend;
              };
      };
  lvds_panel: lvds-panel {
                  status = "okay";
                  compatible = "simple-panel";
                  backlight = <&backlight_lvds>;
                  power-supply = <&vcc3v3_lcd_lvds>;
                  pinctrl-names = "default";
                  rockchip,data-mapping = "jeida-24"; // lvds数据格式
                  /*prepare-delay-ms = <100>;
                  enable-delay-ms = <10>;*/
                  display-timings {
                          native-mode = <&timing1>;
                          timing1: timing1 {
                                  //clock-frequency = <7800000>;
  				clock-frequency = <9000000>;
                                  hactive = <480>;
                                  vactive = <272>;

                                  //hfront-porch = <200>;
  				hfront-porch = <8>;
                                  //hsync-len = <52>;
  				hsync-len = <4>;
                                  //hback-porch = <200>;
  				hback-porch = <43>;
                                  //vfront-porch = <25>;
  				vfront-porch = <8>;
                                  vsync-len = <4>;
                                  //vback-porch = <25>;
  				vback-porch = <12>;

/*
hsync-active = <0>;
vsync-active = <0>;
de-active = <1>;
pixelclk-active = <0>;
*/
};
};

                  ports {
                          panel_in_lvds: endpoint {
                                          remote-endpoint = <&lvds_out_panel>;
                          };
                  };
          };

};
&pwm13 {
status = “okay”;
};
&video_phy0 {
status = “okay”;
};

&lvds {
status = “okay”;

    ports {
            port@1 {
                    reg = <1>;

                    lvds_out_panel: endpoint {
                            remote-endpoint = <&panel_in_lvds>;
                    };
            };
    };

};
&lvds_in_vp1 {
status = “okay”;
};
&lvds_in_vp2 {
status = “disabled”;
};

&route_lvds {
status = “okay”;
connect = <&vp1_out_lvds>;
};

&pinctrl {
lvds-lcd {
vcc3v3_lcd_lvds_en: vcc3v3-lcd-lvds-en {
rockchip,pins = <0 RK_PD5 RK_FUNC_GPIO &pcfg_pull_none>;
};
cabc_en_en: cabc-en-en {
rockchip,pins = <1 RK_PB2 RK_FUNC_GPIO &pcfg_pull_none>;
};
};
};

the value of the timings on the display is important

#4

Thank you very much, Alvaro!!

#5

Hello,

What kernel did you use to make it work?

#6

Hi,
Is there any port of this DT to kernel 6.x? I’m unable to make lvds work on a CM3I any suggestion?