WiFi blocked by vc4.ko on kernel 5.10.12 on RPi4B 8GB

[Maxime Ripard]

Hi,

On Tue, Feb 02, 2021 at 04:20:14PM +0900, Ryutaroh Matsumoto wrote:
> Hi the upstream kernel users on RPi!
> 
> With kernel version 5.10.12, WiFi does not work on my RaspberryPi 4B 8GB model.
> WiFi starts working if module_blacklist=vc4 is given to the kernel command line,
> or the screen is blanked out by the gdm3 display manager after waiting several
> minutes.
> 
> With vc4.ko enabled, after touching a mouse and gdm3 login window is displayed,
> the WiFi again stops working.
> 
> vc4.ko somehow seems to interfere with RPi4B WiFi...
> 
> As vc4.ko was unavailable with 5.9 kernel, I did not observe this symptom on 5.9.
> 
> I wonder if the above symptom is also observed by other RPi users...
> 
> I observe this with vanilla 5.10.12 as well as the Debian kernel as
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=981616

Do you have the patches in this series applied?

https://lore.kernel.org/dri-devel/20201029134018.1948636-1-maxime@cerno.tech/

Maxime
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