RE: [PATCH rtw-next 00/12] wifi: rtw89: Add support for RTL8922AU

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

Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> On 30/03/2026 05:53, Ping-Ke Shih wrote:
> > Bitterblue Smith <rtl8821cerfe2@gmail.com> wrote:
> >> Often one or more of these messages appears when the chip powers on:
> >>
> >> [  +2.167037] rtw89_8922au 1-2:1.0: failed to wait RF DACK
> >>
> >> [  +2.942749] rtw89_8922au 1-2:1.0: failed to wait RF TSSI
> >>
> >> [  +0.019006] rtw89_8922au 2-4:1.0: failed to wait RF PRE_NTFY
> >>
> >> [  +5.985900] rtw89_8922au 2-4:1.0: failed to wait RF DPK
> >>
> >> It's unclear why.
> >
> > RTL8922D done RF calibrations by firmware one by one, so driver should
> > wait for previous one done, and trigger next one. However, it'd be
> > well to just do waiting at the last to wait for all calibrations.
> >
> > Try to enlarge waiting time in rtw8922a_rfk_channel().
> >
> 
> I was convinced I tried that already, but no.
> 
> After increasing all delays a bit the warnings are much more rare.

Turn of debug mask RTW89_DBG_RFK and set a very large timeout time, and
do connection >20 times and then check "RF %s takes %lld ms to complete"
to see the maximum value in your environment.

Please share the number for each RF calibration after your experiments.

> 
> >>
> >> It seems to work well anyway.
> >>
> >
> > If you can yield the highest rate (MCS13), I'd say it is fine.
> >
> > Ping-Ke
> >
> 
> Testing with RTL8832CU (Brostrend AX8) in AP mode, the RTL8912AU can
> reach 1.5 Gbps (MCS10) RX, 1 Gbps TX.
> 
> I used the RTL8832CU because my router is not working well with 160
> MHz.

Since rtw89 only support beamformee (no beamformer), beamforming can't
work between two rtw89 devices. More, two antenna can't have good
beamforming performance. I think this is a point that it is hard to
yield the highest rate. 

Another point may be the RF performance. If the warning messages of
RF calibration disappeared, I'd say this might not a problem.

Let's mention this in commit message of 12/12.

Ping-Ke