Hi,

"Sid Spry" <sid@aeam.us> writes:
> On Tue, Sep 29, 2020, at 1:33 AM, Felipe Balbi wrote:
>> 
>> Hi,
>> 
>> "Sid Spry" <sid@aeam.us> 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.

It's probably failing Rx.Detect and falling back to high-speed. Which
USB Peripheral Controller is that?

-- 
balbi