Documentation/usb/ehci.rst

2 EHCI driver
7 The EHCI driver is used to talk to high speed USB 2.0 devices using
19 into an EHCI controller, they are given to a USB 1.1 "companion"
22 interact with the EHCI controller through a "Transaction Translator"
27 of EHCI from (in alphabetical order):  Intel, NEC, Philips, and VIA.
28 Other EHCI implementations are becoming available from other vendors;
38 Note that USB 2.0 support involves more than just EHCI.  It requires
68 since EHCI represents these with a different data structure.  So for now,
79 The EHCI root hub code hands off USB 1.1 devices to its companion
82 just because the EHCI driver is also present.
96 Assuming you have an EHCI controller (on a PCI card or motherboard)
99     # modprobe ehci-hcd
103     # rmmod ehci-hcd
106 "ohci-hcd"  or "uhci-hcd".  In case of any trouble with the EHCI driver,
109 by the EHCI driver.
117 	the EHCI controller can issue interrupts.
121 any EHCI controller:
137 Device drivers shouldn't care whether they're running over EHCI or not,
177 The first NEC implementation of EHCI seems to have a hardware bottleneck
192 to receive interrupts from the EHCI controller indicating completion
194 default ehci-hcd driver uses the minimum latency, which means that if
202 need to keep the EHCI queue full.  That means issuing large requests,