# Enable verbose USB logging in Linux

Enable verbose USB debug logging through debugfs for device mode,
host mode, or both.

Enable dynamic debug for the driver files that correspond to the mode
you’re debugging.

## Enable verbose USB logging

1. For device mode, enable dynamic debug for the controller and PHY
drivers, and for the function driver of the interface you’re
debugging.

echo 'file dwc3-qcom.c +p' > /d/dynamic_debug/control
        echo 'file phy-msm-snps-eusb2.c +p' > /d/dynamic_debug/control
        echo 'file phy-msm-ssusb-qmp.c +p' > /d/dynamic_debug/control
        echo 'file f_fs.c +p' > /d/dynamic_debug/control
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2. For host mode, enable dynamic debug for the host controller driver
(HCD).

echo 'file hub.c +p' > /d/dynamic_debug/control
        echo 'module xhci_hcd +p' > /d/dynamic_debug/control
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## Related

- [Read the DWC3 debugfs entries](https://docs.qualcomm.com/doc/80-A0399-8/topic/read-dwc3-debugfs-entries.html)
- [Enable full USB logs in UEFI](https://docs.qualcomm.com/doc/80-A0399-8/topic/enable-full-usb-logs-uefi.html)
- [Debug UEFI USB with serial logs and JTAG](https://docs.qualcomm.com/doc/80-A0399-8/topic/debug-uefi-usb-serial-jtag.html)

Last Published: Sep 17, 2026

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