[git pull] drm for 5.14-rc1

[Simon Ser]

CC Emma and Maxime

On Saturday, September 18th, 2021 at 11:18, Michael Stapelberg <michael at stapelberg.ch> wrote:

> Hi,
>
> torvalds at linux-foundation.org (Linus Torvalds) writes:
> > Did I fix it up correctly? Who knows. The code makes more sense to me
> > now and seems valid. But I really *really* want to stress how locking
> > is important.
>
> As far as I can tell, this merge conflict resolution made my Raspberry
> Pi 3 hang on boot. You can find the full serial console output at:
>
> https://t.zekjur.net/linux-5.14-raspberry-pi-3-hang-vc4.txt
>
> The last few messages are from vc4, then the boot hangs.
>
> Using git-bisect, I tracked this down to
> https://github.com/torvalds/linux/commit/e058a84bfddc42ba356a2316f2cf1141974625c9,
> which is the merge you’re talking about here, AFAICT.
>
> I also tried the git://anongit.freedesktop.org/drm/drm, and that tree
> boots as expected, suggesting that the problem really is with the
> additional changes.
>
> The code seems to work on my Raspberry Pi 4, just not on the Raspberry
> Pi 3. Any ideas why that might be, and how to fix it?
>
> Thanks!
>
> --
> Best regards,
> Michael