[Regression] No framebuffer console on Rpi since 5.14-rc1

[Stefan Wahren]

Hi guys,

starting with Linux 5.14-rc1 the framebuffer console on Raspberry Pi 3/4
(no U-Boot, multi_v7_defconfig) isn't available anymore. The display
shows the rainbow screen from the bootloader and than the HDMI screen
goes black instead of kernel messages.

I bisected the issue:

62fb9874f5da54fdb243003b386128037319b219 good
e73f0f0ee7541171d89f2e2491130c7771ba58d3 bad
e058a84bfddc42ba356a2316f2cf1141974625c9 bad
a6eaf3850cb171c328a8b0db6d3c79286a1eba9d good
007b312c6f294770de01fbc0643610145012d244 good
18703923a66aecf6f7ded0e16d22eb412ddae72f good
334200bf52f0637a5ab8331c557dfcecbb9c30fa bad
c707b73f0cfb1acc94a20389aecde65e6385349b bad
caa18dd6dd9305d52943a6b59f410cbc960ad0a0 good
691cf8cd7a531dbfcc29d09a23c509a86fd9b24f bad
2fdcb55dfc86835e4845e3f422180b5596d23cb4 bad
6c3f953381e526a1623d4575660afae8b19ffa20 bad
5ea4dba68305d9648b9dba30036cc36d4e877bca bad
4a888ba03fd97d1cb0253581973533965bf348c4 good
c5ef15ae09637fb51ae43e1d1d98329d67dd4fd6 good
f611b1e7624ccdbd495c19e9805629e22265aa16 bad
ff323d6d72e1e4971c8ba9e2f3cf8afc48f22383 good

f611b1e7624ccdbd495c19e9805629e22265aa16 is the first bad commit
commit f611b1e7624ccdbd495c19e9805629e22265aa16
Author: Kees Cook <keescook at chromium.org>
Date:   Wed Jun 2 14:52:50 2021 -0700

    drm: Avoid circular dependencies for CONFIG_FB
   
    When cleaning up other drm config dependencies, it is too easy to create
    larger problems. Instead, mark CONFIG_FB as a "depends":
   
    drivers/gpu/drm/Kconfig:74:error: recursive dependency detected!

I compared the changes to the config (based on multi_v7_defconfig) with
and without this patch and it shows a lot of changes. Is this intended?

Best regards
Stefan