Re: mt7921e: failure to reset causes network drop

[moosager <moosager90@gmail.com>]

Hi Devin,

> On debugging further, I had the same ownership handshake fail on a mini PC 
> here. What that ruled out, so you can skip them: in-tree against out-of-tree 
> builds, a PCI bus reset, remove and rescan, and a cold boot. The Bluetooth 
> half of the same chip kept working throughout, so the silicon was alive and 
> only the WiFi side was stuck.

I can confirm these are the things I've had to rule out with my testing as well.
I can also attest to the fact that the Bluetooth half of the chip works 
regardless of the Wi-Fi's state (I should've mentioned that earlier): I've used 
my laptop for a while with mt7921e unloaded, all the while Bluetooth was working 
the whole time.

> There is a patch for it that the maintainer has taken

Good, though I don't see which tree it has been merged in, I'm sure I'll see it 
soon in a future release.

> It sits downstream of your bad read though, so it will not stop the
> register going wrong in the first place.

True, I will stress that the root cause has not been found yet and this chip is 
still unusable for me (and others).

Sorry for the late reply, I'll test the output of lspci as well when I get the 
chance to debug this further.