[问答]

RK3568 Android11.0显示屏DTS配置有哪几部分？有什么注意事项？

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RK3568支持三屏显示，显示屏DTS配置划分为三部分：LCD参数配置、LCD引脚配置、VP通道配置

LCD参数配置根据单屏显示参数移植即可
LCD引脚配置，包括RST、PWR、PWM

注意事项：

若不同通道的屏，使用相同的引脚，只需要在其中一个屏中控制

若同时配置的话，则会uboot启动失败

LCD参数配置

LVDS显示配置

&lvds_panel {
      status = "okay";
      compatible = "simple-panel";
      backlight = <&backlight4>;
      enable-delay-ms = <20>;
      prepare-delay-ms = <20>;
      unprepare-delay-ms = <20>;
      disable-delay-ms = <20>;
      bus-format = ;
      width-mm = <217>;
      height-mm = <136>;

      display-timings {
            native-mode = <&timing2>;

            timing2: timing2 {
                     clock-frequency = <45000000>;
                     hactive = <1024>;
                     vactive = <600>;
                     hback-porch = <160>;
                     hfront-porch = <160>;
                     vback-porch = <23>;
                     vfront-porch = <12>;
                     hsync-len = <20>;
                     vsync-len = <3>;
                     hsync-active = <0>;
                     vsync-active = <0>;
                     de-active = <0>;
                     pixelclk-active = <0>;
            };
      };

      ports {
            #address-cells = <1>;
            #size-cells = <0>;

            port@0 {
                     reg = <0>;
                     dual-lvds-even-pixels;
                     panel_in_lvds: endpoint {
            };
      };

      ports {
            #address-cells = <1>;
            #size-cells = <0>;

            port@0 {
                     reg = <0>;
                     dual-lvds-even-pixels;
                     panel_in_lvds: endpoint {
                              remote-endpoint = <&lvds_out_panel>;
                     };
            };
      };
};

&lvds {
      status = "okay";

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

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

&video_phy0 {
      status = "okay";
};

DSI0显示配置

&dsi0 {
      status = "okay";
      rockchip,lane-rate = <480>;
      dsi0_panel: panel@0 {
            status = "okay";
            compatible = "simple-panel-dsi";
            reg = <0>;
            reset-delay-ms = <60>;
            enable-delay-ms = <60>;
            prepare-delay-ms = <60>;
            unprepare-delay-ms = <60>;
            disable-delay-ms = <60>;
            dsi,flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
                     MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET)>;
            dsi,format = ;
            dsi,lanes  = <4>;

            panel-init-sequence = [
                     05 78 01 11
                     05 78 01 29
            ];

            panel-exit-sequence = [
                     05 00 01 28
                     05 78 01 10
            ];

            disp_timings0: display-timings {
                     native-mode = <&dsi0_timing0>;
                     dsi0_timing0: timing0 {
                              clock-frequency = <51000000>;
                              hactive = <1024>;
                              vactive = <600>;
                              hback-porch = <160>;
                              hfront-porch = <136>;
                              vback-porch = <16>;
                              vfront-porch = <16>;
                              hsync-len = <4>;
                              vsync-len = <2>;
                              hsync-active = <0>;
                              vsync-active = <0>;
                              de-active = <0>;
                              pixelclk-active = <1>;
                     };
            };

            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>;
                     };
            };
      };

};

&mipi_dphy0 {
      status = "disabled";
};

DSI1显示配置

&dsi1 {
      status = "okay";
      //rockchip,lane-rate = <480>;
      dsi1_panel: panel@0 {
            status = "okay";
            compatible = "simple-panel-dsi";
            reg = <0>;
            backlight = <&backlight5>;
            reset-delay-ms = <60>;
            enable-delay-ms = <60>;
            prepare-delay-ms = <60>;
            unprepare-delay-ms = <60>;
            disable-delay-ms = <60>;
            dsi,flags = <(MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
                     MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_EOT_PACKET)>;
            dsi,format = ;
            dsi,lanes  = <4>;
            panel-init-sequence = [
                     05 78 01 11
                     05 78 01 29
            ];

            panel-exit-sequence = [
                     05 00 01 28
                     05 78 01 10
            ];

            disp_timings1: display-timings {
                     native-mode = <&dsi1_timing0>;
                     dsi1_timing0: timing0 {
                              clock-frequency = <35000000>;
                              hactive = <1024>;
                              vactive = <600>;
                              hback-porch = <160>;
                              hfront-porch = <136>;
                              vback-porch = <16>;
                              vfront-porch = <16>;
                              hsync-len = <4>;
                              vsync-len = <2>;
                              hsync-active = <0>;
                              vsync-active = <0>;
                              de-active = <0>;
                              pixelclk-active = <1>;
                     };
            };

            ports {
                     #address-cells = <1>;
                     #size-cells = <0>;

                     port@0 {
                              reg = <0>;
                              panel_in_dsi1: endpoint {
                                    remote-endpoint = <&dsi1_out_panel>;
                              };
                     };
            };
      };

      ports {
            #address-cells = <1>;
            #size-cells = <0>;

            port@1 {
                     reg = <1>;
                     dsi1_out_panel: endpoint {
                              remote-endpoint = <&panel_in_dsi1>;
                     };
            };
      };
};

&mipi_dphy1 {
      status = "okay";
};

EDP显示配置

&edp_panel {
      status = "okay";
      compatible = "simple-panel";
      //backlight = <&backlight5>;
      prepare-delay-ms = <20>;
      enable-delay-ms = <20>;
      disable-delay-ms = <20>;
      unprepare-delay-ms = <20>;

      display-timings {
            native-mode = <&timing1>;

            timing0: timing0 {//EDP 13.3
                     clock-frequency = <150000000>;
                     hactive = <1920>;
                     vactive = <1080>;
                     hfront-porch = <12>;
                     hsync-len = <16>;
                     hback-porch = <48>;
                     vfront-porch = <8>;
                     vsync-len = <4>;
                     vback-porch = <8>;
                     hsync-active = <0>;
                     vsync-active = <0>;
                     de-active = <0>;
                     pixelclk-active = <0>;
            };

            timing1: timing1 {// EDP 15.6 LP156WF6
                     clock-frequency = <138000000>;
                     hactive = <1920>;
                     vactive = <1080>;
                     hfront-porch = <48>;
                     hsync-len = <32>;
                     hback-porch = <80>;
                     vfront-porch = <3>;
                     vsync-len = <5>;
                     vback-porch = <23>;
                     hsync-active = <0>;
                     vsync-active = <0>;
                     de-active = <0>;
                     pixelclk-active = <0>;
            };
      };

      ports {
                     panel_in_edp: endpoint {
                              remote-endpoint = <&edp_out_panel>;
                     };
      };
};

&edp {
      hpd-gpios = <&gpio0 RK_PC2 GPIO_ACTIVE_HIGH>;
      status = "okay";
      force-hpd;
      ports {
            port@1 {
                     reg = <1>;

                     edp_out_panel: endpoint {
                              remote-endpoint = <&panel_in_edp>;
                     };
            };
      };
};

&edp_phy {
      status = "okay";
};

VP通道配置

RK3568支持VP0~2，每个VP通道只能配置单一显示屏，并且每个通道支持的显示屏格式不一致

可参考下表，任意搭配

[tr]VP通道支持显示格式[/tr]

VP0	DSI0、DSI1、EDP、HDMI
VP1	DSI0、DSI1、EDP、HDMI、LVDS
VP2	LVDS、RGB

常用参数
VP0 : dsi0_in_vp0、dsi1_in_vp0、edp_in_vp0、hdmi_in_vp0
VP1 : dsi0_in_vp1、dsi1_in_vp1、edp_in_vp1、hdmi_in_vp1、lvds_in_vp1
VP2 : lvds_in_vp2、rgb_in_vp2
dsi0 + vp0
&dsi0_in_vp0 {
      status = "okay";
};

&dsi0_in_vp1 {
      status = "disabled";
};

&route_dsi0 {
      status = "okay";
      connect = <&vp0_out_dsi0>;
};
dsi1 + vp0
&dsi1_in_vp0 {
      status = "okay";
};

&dsi1_in_vp1 {
      status = "disabled";
};

&route_dsi1 {
      status = "okay";
      connect = <&vp0_out_dsi1>;
};
edp + vp1
&edp_in_vp0 {
      status = "disabled";
};

&edp_in_vp1 {
      status = "okay";
};

&route_edp {
      status = "okay";
      connect = <&vp1_out_edp>;
};
lvds + vp2
&lvds_in_vp1 {
      status = "disabled";
};

&lvds_in_vp2 {
      status = "okay";
};

&route_lvds {
      status = "okay";
      connect = <&vp2_out_lvds>;
};

LCD引脚配置

RST/PWR GPIO配置

注意事项：

不论PWM、RST、PWR中任一引脚，都不能重复配置在已经使能的通道下，否则会导致uboot启动失败

// MIPI DSI0
&dsi0_panel {
   power-supply = <&vcc3v3_lcd_n>;
   reset-gpios = <&gpio4 RK_PD2 GPIO_ACTIVE_LOW>;
   pinctrl-names = "default";
   pinctrl-0 = <&lcd_rst_gpio>;
   backlight = <&backlight4>;
};

// MIPI DSI1
&dsi1_panel {
      power-supply = <&vcc3v3_lcd_n>;
      reset-gpios = <&gpio4 RK_PD2 GPIO_ACTIVE_LOW>;
      pinctrl-names = "default";
      pinctrl-0 = <&lcd_rst_gpio>;
      backlight = <&backlight5>;
};

// LVDS
&lvds_panel {
   power-supply = <&vcc3v3_lcd_n>;
   reset-gpios = <&gpio4 RK_PD2 GPIO_ACTIVE_LOW>;
   pinctrl-names = "default";
   pinctrl-0 = <&lcd_rst_gpio>;
   backlight = <&backlight4>;
};

// EDP
&edp_panel {
   power-supply = <&vcc3v3_lcd_n>;
   backlight = <&backlight5>;
};

// POWER GPIO
&vcc3v3_lcd_n {
      gpio = <&gpio0 RK_PC7 GPIO_ACTIVE_HIGH>;
      enable-active-high;
};

&pinctrl {
      lcd1 {
            lcd_rst_gpio: lcd1-rst-gpio {
                     rockchip,pins = <4 RK_PD2 RK_FUNC_GPIO &pcfg_pull_none>;
            };
      };
};

PWM配置

DTS中同时使能PWM4、PWM5，根据原理图在对应的LCD中直接引用即可

/ {
      backlight4: backlight4 {
            compatible = "pwm-backlight";
            pwms = <&pwm4 0 25000 0>;
                              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 = <200>;
      };

      backlight5: backlight5 {
            compatible = "pwm-backlight";
            pwms = <&pwm5 0 25000 0>;
            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 = <200>;
      };
};

&pwm4 {
      status = "okay";
};

&pwm5 {
      status = "okay";
};