The Universal Serial Bus (USB) supports data exchange and power supply between electronic devices at speeds from 1.5 Mbps (low speed) up to 10 Gbps (SuperSpeed Plus). The IQ-9075 uses the Synopsys DesignWare Core SuperSpeed USB 3.x controller connected to USB2 PHY (UTMI) and USB3 PHY (PIPE) interfaces.
The board features three USB connectors: two Type-C (USB0, USB1) and one micro-USB (USB2).
Controllers Controller Address Max Speed HS PHY Rails SS PHY Rails USB0 0xa600000 USB 3.x SuperSpeed L7A (0.88V), L6C (1.8V), L9A (3.3V) L1C, L7A USB1 0xa800000 USB 3.x SuperSpeed L7A (0.88V), L6C (1.8V), L9A (3.3V) L1C, L7A USB2 0xa400000 USB 2.0 High Speed VDD_A_USBHS_2_1P8, VDD_A_USBHS_2_3P1 —
Features Hardware Features Feature Description Dual-Role Device (DRD) Host and device modes with dynamic role detection USB 3.1 Gen1 SuperSpeed 5 Gbps on USB0 and USB1 USB 2.0 High Speed 480 Mbps on all controllers xHCI eXtensible Host Controller Interface compliance Transfer types Control, bulk, interrupt, isochronous Link Power Management ASPM-style LPM for power savings
Software Features Peripheral mode: Mass Storage, Diagnostics (FunctionFS), RNDIS, NCMHost mode: xHCI, HID/MS/Hub class drivers, UVC (USB camera), Link Power ManagementArchitecture Layer Key Components User Space diag-router, qusb — service management, composition switchingVFS /dev/ffs-*, /sys/kernel/config — dynamic config, endpoint accessKernel dwc3-qcom, xHCI, Gadget Framework — dual-role, power managementHardware DWC3 Controllers, Femto/QMP PHYs
Configuration Runtime Power Management # Enable autosuspend echo auto > /sys/bus/platform/devices/a600000.usb/power/control echo 2000 > /sys/bus/platform/devices/a600000.usb/power/autosuspend_delay_ms # Check status cat /sys/bus/platform/devices/a600000.usb/power/runtime_status
Runtime PM is not supported for Type-C ports on IQ-9075.
Enable Remote Wake-up (Host Mode) # Enable wake-up for xHCI echo enabled > /sys/bus/platform/devices/xhci-hcd.X.auto/power/wakeup # Enable wake-up for root hubs echo enabled > /sys/bus/usb/devices/usb1/power/wakeup echo enabled > /sys/bus/usb/devices/usb2/power/wakeup
Prevent Suspend During Composition Switch echo on > /sys/bus/platform/devices/a600000.usb/power/control # Perform composition switch echo auto > /sys/bus/platform/devices/a600000.usb/power/control
USB Camera The IQ-9075 supports USB cameras that comply with the USB Video Class (UVC) standard via the uvcvideo kernel driver, exposing devices as /dev/videoX.
Detect the camera
lsusb v4l2-ctl --list-devices ls -l /dev/v4l/by-id/
Check supported formats
yavta /dev/video2 --enum-formats
Capture or stream video
# MJPEG capture yavta -f MJPEG -s 1280x720 -t 1/30 -c10 -F/home/ubuntu/test.jpeg /dev/video2 # YUYV capture yavta -f YUYV -s 1280x720 -t 1/5 -c10 -F/tmp/test.yuv /dev/video2
ffplay -f v4l2 -framerate 30 -input_format mjpeg -video_size 1920x1080 -i /dev/video2 ffplay -f v4l2 -framerate 30 -input_format yuyv422 -video_size 1920x1080 -i /dev/video2
export XDG_RUNTIME_DIR = / run / user /$( id -u ubuntu ) export WAYLAND_DISPLAY = wayland-1 # 720p stream (YUYV = YUY2 in GStreamer) gst-launch-1.0 -e v4l2src device=/dev/video2 ! \ video/x-raw,format=YUY2,width=1280,height=720,framerate=30/1 ! \ videoconvert ! waylandsink fullscreen= true
For multi-stream inference with USB cameras, see the Qualcomm IM SDK and the gst-usb-single-camera-app .
Verification Host Mode lsusb # List connected USB devices cat /sys/kernel/debug/usb/devices # Detailed device info ls /sys/bus/usb/devices/ # USB device tree
Device Mode cat /sys/kernel/debug/usb/a600000.usb/mode # Check USB mode cat /sys/kernel/debug/usb/a600000.usb/link_state # Check link state qusb showpid # List compositions
Debugging Enable USB Tracing mount -t debugfs none /sys/kernel/debug # Enable traces echo 1 > /sys/kernel/debug/tracing/events/dwc3/enable echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable echo 1 > /sys/kernel/debug/tracing/events/gadget/enable cat /sys/kernel/debug/tracing/trace
Collect Register Dumps mkdir -p /tmp/usb_debug cat /sys/kernel/debug/usb/a600000.usb/regdump > /tmp/usb_debug/regdump.txt cat /sys/kernel/debug/usb/a600000.usb/lsp_dump > /tmp/usb_debug/lsp_dump.txt cat /sys/kernel/debug/usb/a600000.usb/mode > /tmp/usb_debug/mode.txt cat /sys/kernel/debug/usb/a600000.usb/link_state > /tmp/usb_debug/link_state.txt dmesg > /tmp/usb_debug/dmesg.txt lsusb -v > /tmp/usb_debug/lsusb.txt
Troubleshooting
USB Device Not Enumerated
cat /sys/kernel/debug/usb/a600000.usb/mode cat /sys/kernel/debug/usb/a600000.usb/link_state dmesg | grep -i usb
Rebind gadget: qusb unbind && qusb bind
Change composition: qusb setpid <PID>
Check cable connection and power rails
lsusb ls /dev/video * dmesg | grep -i uvc lsmod | grep uvcvideo
Ensure uvcvideo driver is loaded
Try a different USB port
Verify camera is UVC-compliant
Low Power Mode Not Working
cat /sys/bus/platform/devices/a600000.usb/power/runtime_status cat /sys/bus/platform/devices/a600000.usb/power/control
Enable autosuspend: echo auto > /sys/bus/platform/devices/a600000.usb/power/control echo 2000 > /sys/bus/platform/devices/a600000.usb/power/autosuspend_delay_ms
Prevent suspend during the switch: echo on > /sys/bus/platform/devices/a600000.usb/power/control qusb setpid < PI D > echo auto > /sys/bus/platform/devices/a600000.usb/power/control
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