Hi Stefan,
On Wed, Jul 28, 2021 at 05:14:38PM +0200, Stefan Wahren wrote:
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@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?
just one question: does the VC4 drm driver functionally depend on CONFIG_FB / FRAMEBUFFER_CONSOLE ?
No, just the fbdev emulation but it can work perfectly fine without it.
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...
It should work indeed
Maxime