mt76: MT7921K monitor mode not working

[Lorenzo Bianconi]

> From: Sean Wang <sean.wang at mediatek.com>
> 
> >> On Thursday, 2 December 2021 23:13:31 CET Lorenzo Bianconi wrote:
> >> > IIRC you need to disable runtime-pm and deep-sleep to proper enable
> >> > monitor
> >> > mode:
> >> >
> >> > echo 0 > /sys/kernel/debug/ieee80211/phy<x>/mt76/runtime-pm
> >> > echo 0 > /sys/kernel/debug/ieee80211/phy<x>/mt76/deep-sleep
> >> >
> >> > Can you please give it whirl?
> >>
> >> Jan gave me the card. I've set it to a rather busy channel (2.4GHz
> >> channel 11), created a monitor interface, attached tcpdump and then
> >> waited what happens. I didn't get anything and then I've tried to set
> >> runtime-pm and deep- sleep to 0. This didn't change the behavior for
> >> me at lot. I saw two packets and then it went silent again.
> >>
> >> I wanted to try the same on a different card (ath11k) in the same
> >> system. But it crashed my complete system - so I had to recreate the
> >> test setup. This time, I've set runtime-pm + deep-sleep to 0 before
> >> creating mon0. After doing this, it seemed to work.
> >
> >interesting, adding Sean to the loop here.
> >It seems the fw is mainting a different state in this case.
> 
> fw cannot receive any frame on monitor mode in deeply doze mode
> 
> so it seemed to me we need a patch to explicitly disable pm runtime in driver when monitor interface is enabled until it is being disabled.

ack, I agree, but I guess the point here is what is the difference (from the fw pov) if you disable
runtime-pm/deep-sleep before/after the vif is added. I guess it is supposed to
be the same, right?

Regards,
Lorenzo

> 
> >
> >@Sean: any pointers?
> >
> >Regards,
> >Lorenzo
> >
> >>
> >> Kind regards,
> >>	Sven
> >
> 
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