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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