Hi, Am 15.07.21 um 18:35 schrieb 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@xxxxxxxxxxxx> > 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? just one question: does the VC4 drm driver functionally depend on CONFIG_FB / FRAMEBUFFER_CONSOLE ? Or with other words should we re-enable CONFIG_FB like this [1] but for Raspberry Pi related configs? [1] - https://lore.kernel.org/linux-samsung-soc/20210611100204.6240-1-m.szyprowski@xxxxxxxxxxx/ > > Best regards > Stefan > >
