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

Hello,

My name is Ángel Manuel and I am currently working with an Intel SoC FPGA Arria 10. I am trying to connect an Intel RealSense SR300 camera to my system, but I am experiencing USB speed negotiation issues.

Environment:

Platform: Intel SoC FPGA Arria 10

OS: Linux (custom image built with Yocto 4.1 Langdale)

USB driver: dwc2

librealsense built with -DFORCE_RSUSB_BACKEND=ON

When I connect the RealSense SR300 camera, the USB link does not negotiate correctly and the device is always enumerated as Full-Speed (12M) instead of High-Speed or SuperSpeed. At first, I suspected a problem with the USB 3.0 connector of the SR300. However, when I tested with a standard USB 2.0 webcam, I observed exactly the same behavior: the device is still enumerated only as Full-Speed (12M). This suggests the issue is likely related to the USB controller configuration on the Arria 10 rather than the camera itself.

System Output

lsusb -t:

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

|__ Port 1: Dev 2, If 0, Class=Vendor Specific Class, Driver=, 12M

|__ Port 1: Dev 2, If 1, Class=Audio, Driver=, 12M

|__ Port 1: Dev 2, If 2, Class=Audio, Driver=, 12M

dmesg:

[ 204.765768] usb 1-1: new full-speed USB device number 2 using dwc2


Yocto local.conf:

MACHINE = "arria10"

DISTRO_FEATURES:append = " systemd vfat"

DISTRO_FEATURES:remove = " sysvinit"

VIRTUAL-RUNTIME_init_manager = "systemd"

IMAGE_INSTALL:append = " kernel-module-uvcvideo"

KERNEL_MODULE_AUTOLOAD += "uvcvideo"

IMAGE_INSTALL:append = " \

packagegroup-core-boot \

pciutils \

usbutils \

v4l-utils \

i2c-tools \

librealsense2 \

"

EXTRA_OECMAKE:append:pn-librealsense2 = " -DFORCE_RSUSB_BACKEND=ON"