RE: [PATCH rtw-next v3] wifi: rtw89: usb: Support switching to USB 3 mode

[Ping-Ke Shih <pkshih@realtek.com>]

Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> On 18/05/2026 10:51, Ping-Ke Shih wrote:
> > Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> >> The Realtek wifi 6/7 devices which support USB 3 are weird: when first
> >> plugged in, they pretend to be USB 2. The driver needs to send some
> >> commands to the device, which make it disappear and come back as a
> >> USB 3 device.
> >>
> >> Implement the required commands in rtw89.
> >>
> >> Add a new function rtw89_usb_write32_quiet() to avoid the warnings
> >> when writing to R_{AX,BE}_PAD_CTRL2. Even though the write succeeds,
> >> usb_control_msg() returns -EPROTO, probably because the USB device
> >> disappears immediately. This results in some confusing warnings in
> >> the kernel log.
> >>
> >> When a USB 3 device is plugged into a USB 2 port, rtw89 will try to
> >> switch it to USB 3 mode only once. The device will disappear and come
> >> back still in USB 2 mode, of course.
> >
> > As we always try to switch USB 3, is it needed to add a hint to users
> > to plug USB 2 port if he has a bad performance on 2GHz band?
> >
> 
> I can add a message like "2.4 GHz performance may be better in a USB 2
> port".

I suppose we should use rtw89_info(). 

I'll wait for v4.