[git pull] drm for 5.14-rc1

[Maxime Ripard]

Hi,

On Sat, Sep 18, 2021 at 11:18:33AM +0200, Michael Stapelberg wrote:
> 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?

I assume you run your Pi without anything connected on HDMI, and without
hdmi_force_hotplug in your config.txt?

If so, can you test that branch, and let me know if it works for you
https://github.com/mripard/linux/tree/rpi/bug-fixes

Maxime
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