Arria 10 SoC – USB devices always enumerating as Full-Speed (Yocto 4.1, dwc2)

Hi angelsz15​ 

Arria 10 SoC FPGA does not contain an integrated High‑Speed USB PHY. You will need to provide an external USB2.0 HS PHY.

Could you check are these defined in the device tree?:

phy_type = "ulpi";
dr_mode = "host";
phys = <&usb_phy0>;
phy-names = "usb2-phy";

snps,phyif = <0>;         // ULPI
snps,hs_phy_type = "ulpi";
snps,fs_phy_type = "dedicated";

Also, check for the PHY binding status:

dmesg | grep -i phy
dmesg | grep -i ulpi

-Alan

Thanks for the suggestion YokezhiC_Altera​ .

I applied the udev rules fix, but the issue persists. The application is also running as root, so this does not seem to be a permissions problem.

The device is correctly detected (lsusb shows camera, motor, and audio), which indicates that USB connectivity and basic enumeration are working.

The failure happens during device communication:

- Input/Output control transfer failed

- incomplete reads (expected X bytes)

- unexpected USB disconnect

This points to a low-level issue, possibly related to the dwc2 driver or hardware limitations for isochronous transfers (potential USB bus saturation).

Full console output attached:

root@arria10-ea700498022f:~/app# ./kinect_test_app

send_cmd: Input control transfer failed (18)

[ 340.405365] usb 1-1.3: USB disconnect, device number 7

freenect_fetch_reg_info: send_cmd read 18 bytes (expected 118)

send_cmd: Output control transfer failed (-1)

freenect_fetch_reg_const_shift: send_cmd read -1 bytes (expected 8)

freenect_camera_init(): Failed to fetch const shift for device

Device 0x51fda0 open during shutdown, closing...

root@arria10-ea700498022f:~/app# [ 343.517208] usb 1-1.3: new high-speed USB device number 8 using dwc2

root@arria10-ea700498022f:~/app# lsusb -t

/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc2/1p, 480M

|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/3p, 480M

|__ Port 1: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 480M

|__ Port 2: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 12M

|__ Port 3: Dev 8, If 0, Class=Vendor Specific Class, Driver=, 480M

root@arria10-ea700498022f:~/app# lsusb

Bus 001 Device 008: ID 045e:02ae Microsoft Corp. Xbox NUI Camera

Bus 001 Device 003: ID 045e:02b0 Microsoft Corp. Xbox NUI Motor

Bus 001 Device 004: ID 045e:02ad Microsoft Corp. Xbox NUI Audio

Bus 001 Device 002: ID 0409:005a NEC Corp. HighSpeed Hub

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Hi,

It appears that the issue may be due to an incorrect device tree configuration. You might want to review the device tree settings to ensure they are correct.

Here is the reference: 

https://github.com/torvalds/linux/tree/master/arch/arm64/boot/dts/altera

Regards