[LAU] sound devices usb pre 2. usb 2 with 96k

[olaf at klingt.org]

On 15/03/2019 21:06, Chris Caudle wrote:
> On Fri, March 15, 2019 11:19 am, olaf at klingt.org wrote:
>> I got my hands on the sound devices usb pre 2.
> ...
>> Because it should be also standard compliant for usb2 which would make
>> it possible to work in 96k I wonder what would have to be done to make
>> this possible.
> I think you will have to ask Sound Devices.  This tech note seems to
> indicate that the device supports both class 1 and class 2, but it does
> not indicate you have to do anything to switch:
> https://www.sounddevices.com/tech-notes/high-sampling-rates-with-usbpre-2
>
> If you look at the output of lsusb do you see multiple endpoints?  Perhaps
> it exposes a class 1 and a class 2 endpoint simultaneously.
>

lsusb doesn't return much

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 005: ID 04e8:7301 Samsung Electronics Co., Ltd
Bus 001 Device 004: ID 2232:1083 Silicon Motion
Bus 001 Device 003: ID 8087:0a2b Intel Corp.
Bus 001 Device 006: ID 0926:0202
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

so i tried lsusb -t

lsusb -t
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/12p, 480M
     |__ Port 1: Dev 6, If 3, Class=Human Interface Device, 
Driver=usbhid, 480M
     |__ Port 1: Dev 6, If 1, Class=Audio, Driver=snd-usb-audio, 480M
     |__ Port 1: Dev 6, If 2, Class=Audio, Driver=snd-usb-audio, 480M
     |__ Port 1: Dev 6, If 0, Class=Audio, Driver=snd-usb-audio, 480M
     |__ Port 6: Dev 3, If 0, Class=Wireless, Driver=btusb, 12M
     |__ Port 6: Dev 3, If 1, Class=Wireless, Driver=btusb, 12M
     |__ Port 7: Dev 4, If 0, Class=Video, Driver=uvcvideo, 480M
     |__ Port 7: Dev 4, If 1, Class=Video, Driver=uvcvideo, 480M
     |__ Port 8: Dev 5, If 0, Class=Vendor Specific Class, Driver=, 12M