HDMIT Configuration

1. Under the root directory of freelight-u-sdk, run the following command to enter the kernel menu configuration GUI.

   make linux-menuconfig

2. Enter the Device Drivers menu.

3. Enter the Graphics support menu.

4. In the Graphics support menu, select the DRM Support option.

   

5. In the Graphics support menu, select the HDMI2.0 option.

6. Save your change and exit the kernel configuration dialog.

1. Under the root directory of freelight-u-sdk, run the following command to enter the kernel menu configuration GUI.

   make linux-menuconfig

2. Enter the Target packages menu.

3. Enter the Libraries > Graphics > libdrm menu.

4. In the libdrm menu, select the Install test programs option.

   You can see the modetest tool in the kernel for testing.

5. Save your change and exit the kernel configuration dialog.

The following code example configures the HDMI driver at the board level, including enabling the HDMI controller, configuring pinmux, and connecting it to the display controller.

&hdmi {
	status = "okay";                   
	pinctrl-names = "default";         
	pinctrl-0 = <&inno_hdmi_pins>;     

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

		hdmi_in_lcdc: endpoint@0 {     
			reg = <0>;
			remote-endpoint = <&dc_out_dpi1>;  
		};
	};
};

• &hdmi: References the HDMI controller node defined in the SoC’s device tree HDMI Device Tree Source Code.
• status: Enables the HDMI on the board.
• pinctrl-names: Names the pin assigned to HDMI.
• pinctrol-0: Assigns a hardware pin to HDMI.
• hdmi_in: port: Defines a video input port for the HDMI controller.
• hfmi_in_lcdc: endpoint@0: Represents a data connection point in the video pipeline.
  • remote-endpoint: Connects the HDMI controller to the display controller

To debug the display function:

1. Prerequisite: Configure Kenel Menu for Test Program.

2. Run the following command to verify the display function and connection status.

   modetest -M starfive

   For example,

   modetest -M starfive -D 0 -a -s <Connector ID>@<CRTC ID>: <Resolution> -P <Plane ID>@<CRTC ID>: <Resolution>@<Format> -Ftiles