Re: ConfigFS: bcdUSB forced to 0x0210

["Sid Spry" <sid@xxxxxxx>]

On Tue, Sep 29, 2020, at 1:33 AM, Felipe Balbi wrote:
> 
> Hi,
> 
> "Sid Spry" <sid@xxxxxxx> writes:
> > Hi, I can't enable USB3 with e.g. f_ncm because bcdUSB is always reset to 0x0210:
> >
> > $ sudo sh -c 'echo "0x0300" > /sys/kernel/config/usb_gadget/g11/bcdUSB'
> > $ cat /sys/kernel/config/usb_gadget/g11/bcdUSB 
> > 0x0300
> > $ sudo sh -c 'echo "fe800000.usb" > /sys/kernel/config/usb_gadget/g11/UDC'
> > $ cat /sys/kernel/config/usb_gadget/g11/bcdUSB 
> > 0x0210
> > $ tree /sys/kernel/config/usb_gadget/g11
> > /sys/kernel/config/usb_gadget/g11
> > ├── bcdDevice
> > ├── bcdUSB
> > ├── bDeviceClass
> > ├── bDeviceProtocol
> > ├── bDeviceSubClass
> > ├── bMaxPacketSize0
> > ├── configs
> > │   └── c.1
> > │       ├── bmAttributes
> > │       ├── MaxPower
> > │       ├── ncm.0 -> ../../../../usb_gadget/g11/functions/ncm.0
> > │       └── strings
> > │           └── 0x409
> > │               └── configuration
> > ├── functions
> > │   └── ncm.0
> > │       ├── dev_addr
> > │       ├── host_addr
> > │       ├── ifname
> > │       ├── os_desc
> > │       │   └── interface.ncm
> > │       │       ├── compatible_id
> > │       │       └── sub_compatible_id
> > │       └── qmult
> > ├── idProduct
> > ├── idVendor
> > ├── max_speed
> > ├── os_desc
> > │   ├── b_vendor_code
> > │   ├── qw_sign
> > │   └── use
> > ├── strings
> > │   └── 0x409
> > │       ├── manufacturer
> > │       ├── product
> > │       └── serialnumber
> > └── UDC
> >
> > Board is a RK3399 based RockPro64.
> 
> what's your max_speed?
> 

$ cat /sys/kernel/config/usb_gadget/g11/max_speed 
super-speed

Looks ok. From Windows, the xHCI driver reports that the device supports
super speed but chooses high speed. I can't see this info from a Linux host.