Kernel 5.x, LVDS, rockchipdrm problem

Chip Platform Rockchip
1

Hello! Has anyone tried to run the 5.x kernel with lvds panel support? I can’t get lvds to work ( I have enabled lvds in DT, but when rockchipdrm module is loading I get this messages:

[   29.355853] rockchip-vop ff930000.vop: Adding to iommu group 0
[   29.362659] rockchip-vop ff940000.vop: Adding to iommu group 1
[   29.371731] rockchip-drm display-subsystem: bound ff930000.vop (ops vop_component_ops [rockchipdrm])
[   29.382206] rockchip-drm display-subsystem: bound ff940000.vop (ops vop_component_ops [rockchipdrm])
[   29.392482] rockchip-lvds ff96c000.lvds: [drm:rockchip_lvds_bind [rockchipdrm]] *ERROR* failed to find panel and bridge node
[   29.405058] rockchip-drm display-subsystem: failed to bind ff96c000.lvds (ops rockchip_lvds_component_ops [rockchipdrm]): -517
[   29.417924] rockchip-drm display-subsystem: master bind failed: -517

DTS:

/ {
...
lvds_panel: lvds-panel {
		compatible = "simple-panel";
		enable-gpios = <&gpio7 3 GPIO_ACTIVE_HIGH>;
		bus-format = <0x1009>;
		rockchip,data-mapping = "vesa";
		rockchip,data-width = <24>;
		rockchip,output = "lvds";
		status = "okay";

		display-timings {
			native-mode = <&timing0>;

			timing0: timing0 {
				clock-frequency = <85000000>;
				hactive = <1280>;
				vactive = <480>;
				hback-porch = <24>;
				hfront-porch = <368>;
				vback-porch = <9>;
				vfront-porch = <33>;
				hsync-len = <16>;
				vsync-len = <3>;
				hsync-active = <0>;
				vsync-active = <0>;
				de-active = <0>;
				pixelclk-active = <0>;
			};
		};

		ports {
			port {
				panel_in_lvds: endpoint {
					remote-endpoint = <&lvds_out_panel>;
				};
			};
		};
	};
...
};

&lvds {
	rockchip,output = "lvds";
	rockchip,panel = <&lvds_panel>;
	status = "okay";

	ports {
		lvds_out: port@1 {
			reg = <1>;

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

			lvds_out_panel: endpoint@0 {
				reg = <0>;
				remote-endpoint = <&panel_in_lvds>;
			};
		};
	};
};
2

可能原因：
1.dts配置节点里面compatible = “panel-simple”;这个没有起到作用；
2.由于enable-gpios 配置错误或者被其他节点占用；
3.没有配置背光节点。

3

举例（平台RK3326+Linux 4.4):
backlight: backlight {
compatible = “pwm-backlight”;
pwms = <&pwm1 0 25000 0>;
brightness-levels = <
0 1 2 3 4 5 6 7
（省略Ｎ行）
248 249 250 251 252 253 254 255>;
default-brightness-level = <200>;
enable-gpios = <&gpio3 RK_PC0 GPIO_ACTIVE_HIGH>;
};

panel {
status = “okay”;
compatible = “simple-panel”;
backlight = <&backlight>;
power-supply = <&vcc_3v0>;
init-delay-ms = <20>;

            enable-delay-ms = <20>;
            prepare-delay-ms = <20>;
            unprepare-delay-ms = <20>;
            disable-delay-ms = <20>;
            bus-format = <MEDIA_BUS_FMT_RGB888_1X7X4_SPWG>;
            enable-gpios = <&gpio3 RK_PB5 GPIO_ACTIVE_HIGH>;
            standby-gpios = <&gpio3 RK_PB6 GPIO_ACTIVE_HIGH>;
            reset-gpios = <&gpio3 RK_PB7 GPIO_ACTIVE_LOW>;
            width-mm = <217>;
            height-mm = <136>;
            rockchip,output = "lvds";

            display-timings {
                    native-mode = <&timing0>;

                    timing0: timing0 {
                            clock-frequency = <46000000>;
                            hactive = <1024>;
                            vactive = <600>;
                            hback-porch = <90>;
                            hfront-porch = <160>;
                            vback-porch = <13>;
                            vfront-porch = <12>;
                            hsync-len = <70>;
                            vsync-len = <10>;
                            hsync-active = <0>;
                            vsync-active = <0>;
                            de-active = <0>;
                            pixelclk-active = <0>;

                    };
            };

            port {
                    panel_in_lvds: endpoint {
                            remote-endpoint = <&lvds_out_panel>;
                    };
            };

    };
4

This issue occurs equally with calls such as clEnqueueMapBuffer() or clEnqueueReadBuffer(), even when using images clEnqueueMapImage() or clEnqueueReadImage()…

5

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6

thanks for the info

7

It seems like the issue is with the panel or bridge node not being found when the rockchipdrm module loads. Double-check the lvds_panel node and ensure the compatible property, remote-endpoint links, and other references in the Device Tree are correct. Confirm the panel driver for “simple-panel” is enabled in your kernel configuration. Rebuild and re-test.

8

It seems you are facing an issue with Kernel 5.x and the rockchipdrm driver related to LVDS. Have you tried checking the configuration settings or ensuring the driver is compatible with your specific hardware?

9

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