Jetson AGX Orin (R36.4.3) TI DP83867 PHY (RGMII) Not Working

Robotics & Edge Computing Jetson Systems Jetson AGX Orin
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Hello Nvidia,

We are working on Jetson AGX orin industrial version module mounted on custom carrier board. We were trying to bringup RGMII interface with PHY chip DP83867 but unable to make it work below are the background of our setup:

  • Jetpack version- 36.4.3
  • Pinmux - gpio.txt (2.9 KB)
    pinmux.txt (65.7 KB)
  • Device Tree node of RGMII -
ethernet@2310000 {
			status = "okay";

			phy-mode = "rgmii-id";
			phy-handle = <&ext_phy>;
			nvidia,mac-addr-idx = <0>;
			nvidia,phy-reset-gpio = <&gpio TEGRA234_MAIN_GPIO(G, 5) 0>;


			mdio {
				compatible = "nvidia,eqos-mdio";
				#address-cells = <1>;
				#size-cells = <0>;

				ext_phy: phy@0 {
					reg = <1>;
					compatible = "ti,dp83867";
					nvidia,phy-rst-pdelay-msec = <224>; /* msec */
					nvidia,phy-rst-duration-usec = <10000>; /* usec */
					tx-fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
					rx-fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_4_B_NIB>;
					ti,max-output-impedance;
					ti,clk-output-sel = <DP83867_CLK_O_SEL_CHN_A_RCLK>;
					ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_25_NS>;
					ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_75_NS>;
					interrupt-parent = <&gpio>;
					interrupts = <TEGRA234_MAIN_GPIO(G, 4) IRQ_TYPE_LEVEL_LOW>;
		            ti,rx-internal-delay = <0x8>;
		            ti,tx-internal-delay = <0xa>;
		            ti,fifo-depth = <0x1>;
				};
			};
		};
  • DP83867 enable in kernel config-
CONFIG_DP83867_PHY=y

Below are the error messages of RGMII-

[   11.723712] nvethernet 2310000.ethernet: Adding to iommu group 54
[   11.852473] nvethernet 2310000.ethernet: failed to read skip mac reset flag, default 0
[   11.852483] nvethernet 2310000.ethernet: failed to read MDIO address
[   11.852488] nvethernet 2310000.ethernet: setting to default DMA bit mask
[   12.141366] nvethernet 2310000.ethernet: Ethernet MAC address:48:b0:2d:94:ac:d
[   12.205933] nvethernet 2310000.ethernet: Macsec not enabled
[   12.214332] nvethernet 2310000.ethernet: eth1 (HW ver: 53) created with 8 DMA channels
[   12.563479] mdio_bus 2310000.ethernet: MDIO device at address 0 is missing.
[   12.563531] nvethernet 2310000.ethernet: failed to connect PHY

[ 20.163987] mdio_bus 2310000.ethernet: MDIO device at address 0 is missing.
[ 20.172251] nvethernet 2310000.ethernet: failed to connect PHY
[ 20.179193] net eth0: ether_open: Cannot attach to PHY (error: -19)

Along with above messages we are seeing a fixed behavior when we probed the Reset, MDC and MDIO lines which is-

  • When Module power ON we can see activity on MDC and MDIO lines also reset is high at this time.
  • Reset will high during whole boot process but as soon as board boots up the reset goes low and it will be always low never goes to high.
  • During this process there is no activity on MDC and MDIO lines.

Note: we do full flash of module every time during RGMII changes to reduce any flashing related issues.