MIPI Driver 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 Starfive MIPI DSI Select option.

6. To enable the M31 DPHY, go back to Device Drivers menu, enter the PHY Subsystem menu, and select the Starfive M31 MIPI DPHY TX Driver option.

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

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

   make buildroot_initramfs-menuconfig

2. Enter the Target packages > Libraries > libdrm menu.

3. Select the Install test programs option, or you may select ALL options under this menu.

   

   Result: After you have completed all the above configuration, you can use the modetest tool in kernel for testing.

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

The following code example enables MIPI DSI controller at the board level:

linux/arch/riscv/boot/dts/starfive/jh7110-common.dtsi:
&mipi_dsi {
	status = "okay";
};

The following code example enables MIPI DPHY at the board level:

linux/arch/riscv/boot/dts/starfive/jh7110-common.dts:
&mipi_dphy {
	status = "okay";
};

Enable and tune the I2C2 bus in jh7110-common.dts, and then declare the Seeed DSI panel as its I2C slave child node. The panel’s endpoint references the pre-defined dsi_out_port from jh7110.dtsi, forming one half of the bidirectional display pipeline link (DSI TX output to panel input).

// jh7110-common.dts (board-level DTS)
&i2c2 {
	clock-frequency = <100000>;
	i2c-sda-hold-time-ns = <300>;
	i2c-sda-falling-time-ns = <510>;
	i2c-scl-falling-time-ns = <510>;
	auto_calc_scl_lhcnt;
	pinctrl-names = "default";
	pinctrl-0 = <&i2c2_pins>;
	status = "okay";

	// Board-defined MIPI DSI panel I2C slave node
	seeed_plane_i2c@45 {
		compatible = "seeed_panel";
		reg = <0x45>; // I2C slave address of panel controller IC
       // Panel input endpoint to connect DSI output port
		port {
			panel_dsi_port: endpoint {
				remote-endpoint = <&dsi_out_port>;
			};
		};

The complete bidirectional cross-reference spans two files:

• Board file (jh7110-common.dts): Panel endpoint points to DSI output &dsi_out_port
• SoC header (jh7110.dtsi): The MIPI DSI controller’s output endpoint pre-declares the reverse reference remote-endpoint = <&panel_dsi_port>.