drm/vc4: module dysfunctional on Raspberry Pi 3B as of 5.18.0

[Peter Mattern]

 > If I understand you properly, it results in a blank screen if the
 > monitor is connected, but the system is still responsive?
Yes. Similar to (the other) Peter's findings, the system is fully 
responsive, it's just that the monitor is displaying a black screen.
Meanwhile I stumbled upon another detail: when the problem is manifest, 
the monitor's LED displaying whether a signal is available keeps shining 
permanently. I does not start flashing as it does when an attached 
computer is switched off.

 > If so, it's a very different problem than the link you provided, since
 > it was occurring when no monitor was connected and resulted in a total
 > system hang.
I didn't follow up things too closely. But I remember very well that I 
stumbled upon that thread "Linux 5.16.3 breaks headless Raspberry Pi 3 
boot, again" while I was facing the exact same problem we're discussing 
right now. Also, some findings in the Arch Linux ARM forums were similar 
then [1].
The problem did disappear in 5.16.7 when some offending commit was reverted.

 > I tested on 5.18 on my 3B and it works well. Could you paste your kernel
 > configuration and config.txt somewhere?
Just done in a Mail which was supposed to respond to Stefan's first one, 
which went wrong. (As Stefan isn't subscribed his mail was lacking the 
usual headers like "In-Reply-to". So I started editing by hitting the 
link on top of [2]. But this didn't work.)

[1] https://archlinuxarm.org/forum/viewtopic.php?f=57&t=15842
[2] https://lists.freedesktop.org/archives/dri-devel/2022-June/357819.html