Sorry, forgot to mention. My DT settings are:
vga {
compatible = "vga-connector";
status = "okay";
port {
vga_con_in: endpoint {
remote-endpoint = <&vga_bridge_out>;
};
};
};
bridge {
compatible = "dumb-vga-dac";
status = "okay";
ports {
#address-cells = <1>;
#size-cells = <0>;
port@0 {
reg = <0>;
vga_bridge_in: endpoint {
remote-endpoint = <&tcon0_out_vga>;
};
};
port@1 {
reg = <1>;
vga_bridge_out: endpoint {
remote-endpoint = <&vga_con_in>;
};
};
};
};
and in ports of tcon0:
tcon0_out: port@1 {
#address-cells = <1>;
#size-cells = <0>;
reg = <1>;
tcon0_out_hdmi: endpoint@1 {
reg = <1>;
remote-endpoint = <&hdmi_p0_ep0>;//<0x12>;
allwinner,tcon-channel = <1>;
};
tcon0_out_vga: endpoint@0 {
reg = <0>;
remote-endpoint = <&vga_bridge_in>;
};
tcon0_out_tve0: endpoint@2 {
reg = <2>;
remote-endpoint = <&tve0_in_tcon0>;
allwinner,tcon-channel = <0>;
};
};
On Friday, 29 April 2022 at 12:53:07 UTC+3 Daft Soft wrote:
> Hi, All!
> I've spent a lot of time trying to bring VGA output on A20 up. But no luck
> at all.
> I've managed to configure U-Boot to output to VGA by just enabling hidden
> line in .config.
> I know this should be somehow "routed" through Allwinner's DE, BE, FE,
> TCON, connectors, bridges, panels...
> Could someone please help or give some hints on how to configure DT? I
> have a lot of mess there around display engine, tcons, front ends and etc
> in my DT and I'm out of ideas at the moment.
>
> My kernel is 5.2.21. Ask for any additional information.
> At the moment I have:
> [drm] Initialized lima 1.0.0 20190217 for 1c40000.gpu on minor 0
> sun4i-drm display-engine: bound 1e00000.display-frontend (ops 0xc085dc28)
> sun4i-drm display-engine: bound 1e20000.display-frontend (ops 0xc085dc28)
> sun4i-drm display-engine: bound 1e60000.display-backend (ops 0xc085d2ec)
> sun4i-drm display-engine: bound 1e40000.display-backend (ops 0xc085d2ec)
> sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops 0xc085c014)
> sun4i-drm display-engine: No panel or bridge found... RGB output disabled
> sun4i-drm display-engine: bound 1c0d000.lcd-controller (ops 0xc085c014)
> sun4i-drm display-engine: bound 1c16000.hdmi (ops 0xc085e140)
> sun4i-drm display-engine: bound 1c0a000.tv-encoder (ops 0xc085cbac)
> [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [drm] No driver support for vblank timestamp query.
> [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 1
> sun4i-drm display-engine: fb0: sun4i-drmdrmfb frame buffer device
>
>
>
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