IMX93 LVDS pending can't work

[AlanWen]

Hi support team, I have a i.MX 93 board implement LVDS display.

The LVDS device seems not work well as the message shown below.

root@imx93evk:~# dmesg | grep lvds
[    0.347598] platform lvds_panel: Fixed dependency cycle(s) with /ldb-display-controller/lvds-channel@0/port@1/endpoint
[   18.912536] platform lvds_backlight: deferred probe pending
[   18.923246] platform lvds_panel: deferred probe pending

While the brightness node can't be found in lvds_backlight node.

root@imx93evk:/sys/devices/platform/lvds_backlight# ls -al
total 0
drwxr-xr-x  3 root root    0 Sep 20  2023 .
drwxr-xr-x 44 root root    0 Jul  9 13:26 ..
lrwxrwxrwx  1 root root    0 Jul  9 13:26 consumer:platform:lvds_panel -> ../../virtual/devlink/platform:lvds_backlight--platform:lvds_panel
-rw-r--r--  1 root root 4096 Jul  9 13:26 driver_override
-r--r--r--  1 root root 4096 Jul  9 13:26 modalias
lrwxrwxrwx  1 root root    0 Jul  9 13:26 of_node -> ../../../firmware/devicetree/base/lvds_backlight
drwxr-xr-x  2 root root    0 Jul  9 13:26 power
lrwxrwxrwx  1 root root    0 Sep 20  2023 subsystem -> ../../../bus/platform
lrwxrwxrwx  1 root root    0 Jul  9 13:26 supplier:platform:regulator_lvdsblpwr -> ../../virtual/devlink/platform:regulator_lvdsblpwr--platform:lvds_backlight
-rw-r--r--  1 root root 4096 Sep 20  2023 uevent
-r--r--r--  1 root root 4096 Jul  9 13:26 waiting_for_supplier

This is my LVDS device tree:

/ {
        reg_lvds_pwr: regulator_lvdspwr {
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_lvds0_pwr>;
		compatible = "regulator-fixed";
		regulator-name = "lvds0_vdden";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
		gpio = <&gpio3 31 GPIO_ACTIVE_HIGH>;
		enable-active-high;
		regulator-always-on;
	};

	reg_lvds_backlight_pwr: regulator_lvdsblpwr {
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_lvds0_backlight_pwr>;
		compatible = "regulator-fixed";
		regulator-name = "lvds0_bl_en";
		regulator-min-microvolt = <3300000>;
		regulator-max-microvolt = <3300000>;
		gpio = <&gpio1 10 GPIO_ACTIVE_HIGH>;
		enable-active-high;
		regulator-always-on;
	};

	lvds_backlight: lvds_backlight {
		compatible = "pwm-backlight";
		pwms = <&tpm2 0 100000 0>;
		power-supply = <&reg_lvds_backlight_pwr>;
		status = "okay";

		brightness-levels = < 0   1   2   3   4   5   6   7   8   9
				     10  11  12  13  14  15  16  17  18  19
				     20  21  22  23  24  25  26  27  28  29
				     30  31  32  33  34  35  36  37  38  39
				     40  41  42  43  44  45  46  47  48  49
				     50  51  52  53  54  55  56  57  58  59
				     60  61  62  63  64  65  66  67  68  69
				     70  71  72  73  74  75  76  77  78  79
				     80  81  82  83  84  85  86  87  88  89
				     90  91  92  93  94  95  96  97  98  99
				     100 101 102 103 104 105 106 107 108 109
				     110 111 112 113 114 115 116 117 118 119
				     120 121 122 123 124 125 126 127 128 129
				     130 131 132 133 134 135 136 137 138 139
				     140 141 142 143 144 145 146 147 148 149
				     150 151 152 153 154 155 156 157 158 159
				     160 161 162 163 164 165 166 167 168 169
				     170 171 172 173 174 175 176 177 178 179
				     180 181 182 183 184 185 186 187 188 189
				     190 191 192 193 194 195 196 197 198 199
				     200 201 202 203 204 205 206 207 208 209
				     210 211 212 213 214 215 216 217 218 219
				     220 221 222 223 224 225 226 227 228 229
				     230 231 232 233 234 235 236 237 238 239
				     240 241 242 243 244 245 246 247 248 249
				     250 251 252 253 254 255>;
		default-brightness-level = <128>;
		max-brightness = <255>;
	};

	lvds_panel {
		compatible = "auo,g101evn010";
		power-supply = <&reg_lvds_pwr>;
		backlight = <&lvds_backlight>;
		
		port {
			panel_lvds_in: endpoint {
				remote-endpoint = <&lvds_out>;
			};
		};
	};
};

&ldb {
    status = "okay";

    lvds-channel@0 {
        fsl,data-mapping = "spwg";
	fsl,data-width = <24>;
	status = "okay";
        
	port@1 {
                reg = <1>;

                lvds_out: endpoint {
                    remote-endpoint = <&panel_lvds_in>;
                };
           };
    };
};

&ldb_phy {
	status = "okay";
};

&lcdif {
	status = "okay";
};

Please help to solve this problem. Thanks in advance.

[Rita_Wang]

Can you share the full log file to us?