# Linux USB features

The Linux USB stack supports USB3 and USB2, and the USB device tree
configuration is in `/arch/arm64/boot/dts/qcom/glymur.dtsi`.

The multiport controller driver is ported from upstream. For USB-C, the
USB retimer control migrates to the SoCCPv2 charger PD firmware for
improved security and consistency with embedded controller (EC)-based
designs.

The USB stack supports peripheral and host functions. The following
table lists the supported Linux USB features and their comments.

| Feature | Supported | Comments |
| --- | --- | --- |
| Peripheral ADB | Yes | ADB functionality is integrated over FFS. |
| Peripheral mass storage | Yes | — |
| Peripheral diag | Yes | Diag functionality is integrated over FFS. |
| Host USB 3.0 driver (xHCI) | Yes | — |
| USB attached SCSI protocol | Yes | UASP is enabled by default in the GKI kernel. |
| Host HS USB | Yes | — |
| Host HID/MS/Hub driver | Yes | — |
| Host video driver | Yes | Verified on limited webcam models. |
| Host link power management | Yes | — |

The USB subsystem supports several loading, debug, host, and charging
use cases:

- **Software loading** — Emergency download (PBL) [PCAP] and UEFI
(fastboot).
- **Debugging tools** — RAM dump collection (XBL), ADB, and diag.
- **Host mode** — Detection of hubs, human interface devices (HIDs),
and mass storage devices.
- **USB charging**

## Related

- [USB kernel configurations](https://docs.qualcomm.com/doc/80-A0399-8/topic/usb-kernel-configurations.html)
- [USB controller software drivers](https://docs.qualcomm.com/doc/80-A0399-8/topic/usb-controller-software-drivers.html)
- [Enable a USB controller in Device mode](https://docs.qualcomm.com/doc/80-A0399-8/topic/enable-usb-controller-device-mode.html)

Last Published: Sep 17, 2026

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