XHCI(4)                FreeBSD Kernel Interfaces Manual                XHCI(4)

NAME

     xhci - USB eXtensible Host Controller driver

SYNOPSIS

     options USB_DEBUG
     device xhci

DESCRIPTION

     The xhci driver provides support for the USB eXtensible Host Controller
     Interface, which allows use of USB 1.0, 2.0 and 3.0 devices on the same
     USB port.

     The XHCI controller supports USB connection speeds from 5.0Gbps and above
     when using USB 3.x compliant devices.

HARDWARE

     The xhci driver supports XHCI compatible controllers having PCI class 12
     (serial bus), subclass 3 (USB) and programming interface 48 (XHCI).

SYSCTL VARIABLES

     The following variables are available as both sysctl(8) variables and
     loader(8) tunables:

     hw.usb.xhci.debug
             Set debug output level, where 0 is debugging disabled and larger
             values increase debug message verbosity.  The default value is 0.

     hw.usb.xhci.dcepquirk
             Set to enable quirk for deconfiguration of endpoints.  The
             default value is 0.

     hw.usb.xhci.ctlquirk
             Set to submit full USB control request as one job, up to
             64kBytes.  Else the USB control request will be split into
             multiple smaller requests.  The default value is 1.

     hw.usb.xhci.streams
             Set to enable USB streams support.  The default value is 0.

     hw.usb.xhci.route
             Set bitmap for switching EHCI ports to the XHCI controller.  The
             default value is 0.

     hw.usb.xhci.polling
             Set to use a timer to poll the interrupt handler.  The default
             value is 0.

     hw.usb.xhci.dma32
             Set to only use 32-bit DMA for the XHCI controller.  The default
             value is 0.

     hw.usb.xhci.ctlstep
             Set to enable control endpoint status state stepping.  The
             default value is 0.

SEE ALSO

     ehci(4), ohci(4), uhci(4) and usb(4)

HISTORY

     The xhci device driver first appeared in FreeBSD 8.2.

FreeBSD 15.1-STABLE-HBSD       October 21, 2022                        XHCI(4)