mt76: MT7921K monitor mode not working

[Lorenzo Bianconi]

> 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.

@Sean: any pointers?

Regards,
Lorenzo

> 
> Kind regards,
> 	Sven


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