Re: USB questions

[Greg KH <greg@kroah.com>]

On Wed, Feb 19, 2020 at 04:55:28PM -0500, James wrote:
> https://asrock.com/MB/AMD/B450M%20Pro4/index.us.asp#Specification
> - 2 x USB 2.0 Ports (Supports ESD Protection)
> - 1 x USB 3.1 Gen2 Type-A Port (10 Gb/s) (Supports ESD Protection)
> - 1 x USB 3.1 Gen2 Type-C Port (10 Gb/s) (Supports ESD Protection)
> - 4 x USB 3.1 Gen1 Ports (Supports ESD Protection)
> 
> $ lsusb
> Bus 004 Device 002: ID 13fe:6300 Kingston Technology Company Inc. USB DISK
> 3.0
> Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 003 Device 004: ID 051d:0002 American Power Conversion Uninterruptible
> Power Supply
> Bus 003 Device 003: ID 04a9:190f Canon, Inc. CanoScan LiDE 220
> Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 002 Device 002: ID 0bc2:2321 Seagate RSS LLC Expansion Portable
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 001 Device 006: ID 1bcf:0005 Sunplus Innovation Technology Inc. Optical
> Mouse
> Bus 001 Device 005: ID 04d9:1503 Holtek Semiconductor, Inc. Keyboard
> Bus 001 Device 004: ID 1a40:0101 Terminus Technology Inc. Hub
> Bus 001 Device 003: ID 046d:082c Logitech, Inc. HD Webcam C615
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> 
> $ lsusb -t
> /:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
>     |__ Port 1: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
> /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
>     |__ Port 2: Dev 3, If 0, Class=Vendor Specific Class, Driver=, 480M
>     |__ Port 4: Dev 4, If 0, Class=Human Interface Device, Driver=usbfs,
> 1.5M
> /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
>     |__ Port 2: Dev 2, If 0, Class=Mass Storage, Driver=uas, 5000M
> /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 480M
>     |__ Port 5: Dev 3, If 0, Class=Audio, Driver=snd-usb-audio, 480M
>     |__ Port 5: Dev 3, If 1, Class=Audio, Driver=snd-usb-audio, 480M
>     |__ Port 5: Dev 3, If 2, Class=Video, Driver=uvcvideo, 480M
>     |__ Port 5: Dev 3, If 3, Class=Video, Driver=uvcvideo, 480M
>     |__ Port 6: Dev 4, If 0, Class=Hub, Driver=hub/4p, 480M
>         |__ Port 3: Dev 6, If 0, Class=Human Interface Device,
> Driver=usbhid, 1.5M
>         |__ Port 1: Dev 5, If 1, Class=Human Interface Device,
> Driver=usbhid, 1.5M
>         |__ Port 1: Dev 5, If 0, Class=Human Interface Device,
> Driver=usbhid, 1.5M
> 
> 
> 1. Does this mean the installer used the USB2 connections on the motherboard
> even though it looks like USB3.1 Gen ones were available?

No, why do you say that?

> 2. What is the number after the slash (4p) on xhci_hcd/4p?

ports.

> 3. Shouldn't "Linux Foundation 3.0 root hub" be "Linux Foundation 3.1 Gen 1
> root hub"?

No, we don't say that from within the kernel.

thanks,

greg k-h