WhyCan Forum(哇酷开发者社区)

panel: panel {
		compatible = "lg,lb070wv8”, “simple-panel";
		#address-cells = <1>;
		#size-cells = <0>;
		enable-gpios = <&pio 4 6 GPIO_ACTIVE_HIGH>;

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

			panel_input: endpoint@0 {
				reg = <0>;
				remote-endpoint = <&tcon0_out_lcd>;
			};
		};
	};
其次是检查内核是否开启了相关的驱动，这里使用的是 lichepi nano，依赖的驱动是 SUN4I 系列的驱动

CONFIG_DRM_SUN4I=y
CONFIG_DRM_SUN4I_HDMI=y
CONFIG_DRM_SUN4I_BACKEND=y

[    1.079849] [drm:drm_core_init] Initialized
[    1.084524] [drm:sun4i_drv_probe] Adding component /soc/display-backend@1e60000
[    1.092143] [drm:sun4i_drv_probe] Adding component /soc/lcd-controller@1c0c000
[    1.099606] [drm:sun4i_drv_probe] Adding component /panel
[    1.105025] [drm:sun4i_drv_traverse_endpoints] No output to bind on port 1
[    1.124695] [drm:compare_of] Comparing of node /soc/lcd-controller@1c0c000 with /soc/display-backend@1e60000
...

static const struct sun4i_tcon_quirks suniv_quirks = {
    .has_channel_0		= true,
	.has_channel_1		= true,
};

[    1.079943] [drm:drm_core_init] Initialized
[    1.084616] [drm:sun4i_drv_probe] Adding component /soc/display-backend@1e60000
[    1.092235] [drm:sun4i_drv_probe] Adding component /soc/lcd-controller@1c0c000
[    1.099662] [drm:sun4i_drv_traverse_endpoints] Endpoint is our panel... skipping
[    1.121843] [drm:compare_of] Comparing of node /soc/display-backend@1e60000 with /soc/display-backend@1e60000
[    1.131931] [drm:compare_of] Comparing of node /soc/display-backend@1e60000 with /soc/lcd-controller@1c0c000
后来在看到了这份 commit中说的内容，将 .has_channel_1 屏蔽掉，drm 正常工作了

static const struct sun4i_tcon_quirks suniv_f1c100s_quirks = {
	/*
	 * The F1C100s SoC has a second channel in TCON, but the clock input of
	 * it is not documented.
	 */
	.has_channel_0		= true,
	/* .has_channel_1	= true, */
};