[Cubietruck Armbian Bionic Desktop black screen]

I still haven't had time to push proper patches to the kernel or Armbian build repo, but here is a working user devicetree overlay that works for me.

 

https://gist.github.com/artizirk/636e3fe9320bb0f6af9c419a79157346

 

/dts-v1/;
/plugin/;

/* Based on https://github.com/wens/linux/commits/sun4i-drm-tve-vga-wip */
/* Tested with Cubetruck */
/* save it somewhere and run sudo armbian-add-overlay vga.dts */

/ {
	compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5";

	fragment@0 {
		target-path = "/soc";
		__overlay__ {
			tve0: tv-encoder@1c0a000 {
				compatible = "allwinner,sun4i-a10-tv-encoder";
				reg = <0x01c0a000 0x1000>;
				clocks = <&ccu 54>;  /* #define CLK_AHB_TVE0	54 */

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

					port@0 {
						reg = <0>;

						tve0_in_tcon0: endpoint {
							remote-endpoint = <&tcon0_out_tve0>;
						};
					};

					tve0_out: port@1 {
						reg = <1>;
						#address-cells = <1>;
						#size-cells = <0>;
						/* endpoint number denotes the TVOUT on the SoC used */
						tve0_out_g: endpoint@0 {
							reg = <0>; /* TVOUT 0 */
							allwinner,tve-source = <4>; /* Y/G */
							remote-endpoint = <&vga_connector_in_g>;
						};

						tve0_out_b: endpoint@1 {
							reg = <1>; /* TVOUT 1 */
							allwinner,tve-source = <5>; /* U/Pb/B */
							remote-endpoint = <&vga_connector_in_b>;
						};

						tve0_out_r: endpoint@2 {
							reg = <2>; /* TVOUT 2 */
							allwinner,tve-source = <6>; /* V/Pr/R */
							remote-endpoint = <&vga_connector_in_r>;
						};
					};
				};
			};

		};
	};

	fragment@1 {
		target-path = "/soc/lcd-controller@1c0c000/ports/port@1";
		__overlay__ {
			tcon0_out_tve0: endpoint@2 {
				reg = <2>;
				remote-endpoint = <&tve0_in_tcon0>;
				allwinner,tcon-channel = <1>;
			};
		};
	};


	fragment@2 {
		target-path = "/";
		__overlay__ {
			vga-connector {
				compatible = "vga-connector";
				label = "vga";
				ddc-i2c-bus = <&i2c2>;

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

					vga_connector_in_r: endpoint@0 {
						reg = <0>;
						remote-endpoint = <&tve0_out_r>;
					};

					vga_connector_in_g: endpoint@1 {
						reg = <1>;
						remote-endpoint = <&tve0_out_g>;
					};

					vga_connector_in_b: endpoint@2 {
						reg = <2>;
						remote-endpoint = <&tve0_out_r>;
					};

					/* usage of tve0 implies h/v sync from tcon0 */
				};
			};
		};
	};
};

 

[Cubietruck Armbian Bionic Desktop black screen]

Those commits don't apply cleanly but i got it working on my Cubietruck!

 

[Cubietruck Armbian Bionic Desktop black screen]

Cubietrucks A20 chip needs some Device Tree patches from here to make VGA work on 4.15+ mainline kernel

 

https://github.com/wens/linux/commits/sun4i-drm-tve-vga-wip