rk3399pro 修改配置HDMI显示

rk3399pro原厂的开发板是带屏幕的，默认buildroot SDK是用eDp屏幕显示，需要HDMI进行显示的话，需要修改一些配置，下面来看下。

1 S50launcher的修改

app/QLauncher下的S50launcher添加两处配置：

export WESTON_DRM_PRIMARY=HDMI-A-1  #指定主显为HDMI-A-1 
export WESTON_DRM_MIRROR=1  #使用镜像模式（多屏同显）,不设置此环境变量即为异显

运行下面的命令删掉之前编译生成的，然后重新编译rootfs：

rm buildroot/output/rockchip_rk3399pro_combine/build/QLauncher-1.0 -rf

2 weston.ini的修改

设置输出节点及拉伸，并设置放大倍数：

buildroot/board/rockchip/common/base/etc/xdg/weston/weston.ini

添加：

[output]
name=HDMI-A-1
transform=normal
scale=1
# 需为整数倍数，支持应用内部实现缩放

运行下面的命令删掉之前编译生成的，然后重新编译rootfs：

rm buildroot/output/rockchip_rk3399pro_combine/build/weston-8.0.0/ -rf

3 kernel内核的修改

更换开机画面，解决开机画面黑屏，修改如下：

zl@zl-Lenovo:~/workspace_rk/rk3399pro/rk3399pro-linux/kernel$ git status 
HEAD detached at 50e652d
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

    modified:   arch/arm64/boot/dts/rockchip/rk3399-linux.dtsi
    modified:   arch/arm64/boot/dts/rockchip/rk3399pro-evb-v11-linux.dts
    modified:   logo.bmp
    modified:   logo_kernel.bmp

no changes added to commit (use "git add" and/or "git commit -a")
zl@zl-Lenovo:~/workspace_rk/rk3399pro/rk3399pro-linux/kernel$ git diff .
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-linux.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-linux.dtsi
index db45778..5dafbbf 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-linux.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-linux.dtsi
@@ -166,7 +166,7 @@
                        logo,kernel = "logo_kernel.bmp";
                        logo,mode = "center";
                        charge_logo,mode = "center";
-                       connect = <&vopb_out_hdmi>;
+                       connect = <&vopl_out_hdmi>;
                };

                route_dsi: route-dsi {
@@ -184,7 +184,7 @@
                        logo,kernel = "logo_kernel.bmp";
                        logo,mode = "center";
                        charge_logo,mode = "center";
-                       connect = <&vopl_out_edp>;
+                       connect = <&vopb_out_edp>;
                };
        };
 };
diff --git a/arch/arm64/boot/dts/rockchip/rk3399pro-evb-v11-linux.dts b/arch/arm64/boot/dts/rockchip/rk3399pro-evb-v11-linux.dts
index 2231a14..18bcaa8 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399pro-evb-v11-linux.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399pro-evb-v11-linux.dts
@@ -143,7 +143,7 @@

                ports {
                        panel_in: endpoint {
-                               remote-endpoint = <&edp_out>;
+                               remote-endpoint = <&hdmi_out>;
                        };
                };
        };
@@ -285,7 +285,7 @@
 };

 &edp {
-       status = "okay";
+       status = "disabled";
        force-hpd;

        ports {
@@ -299,7 +299,7 @@
        };
 };

-&edp_in_vopb {
+&edp_in_vopl {
        status = "disabled";
 };

@@ -341,9 +341,18 @@
                <297000000 0x8039 0x0005 0x028d>,
                <594000000 0x8039 0x0000 0x00f6>,
                <000000000 0x0000 0x0000 0x0000>;
+       ports {
+                port@0 {
+                        reg = <0>;
+
+                        hdmi_out: endpoint {
+                                remote-endpoint = <&panel_in>;
+                        };
+                };
+        };
 };

-&hdmi_in_vopl {
+&hdmi_in_vopb {
        status = "disabled";
 };

@@ -993,6 +1002,10 @@
        status = "okay";
 };

+&route_hdmi {
+        status = "okay";
+};
+
 &saradc {
        status = "okay";
        vref-supply = <&vcc_1v8>;
diff --git a/logo.bmp b/logo.bmp
index 750a0bb..f0a0384 100644
Binary files a/logo.bmp and b/logo.bmp differ
diff --git a/logo_kernel.bmp b/logo_kernel.bmp
index 1afef1e..f0a0384 100644
Binary files a/logo_kernel.bmp and b/logo_kernel.bmp differ

4总结

将内核和文件系统的配置修改并重新编译之后，需要重新烧录，然后进行测试，可以看到HDMI可以正常显示了。