On 17 Dec 2020 Ryutaroh Matsumoto <ryuta...@ict.e.titech.ac.jp> wrote: > I modprobe'ed v3d.ko on vanilla Linux kernel 5.10.1, > but /dev/dri/render* does not appear like > > https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1880125/comments/14
That comment mentions the following kernel config options: > CONFIG_CLK_RASPBERRYPI=y > CONFIG_ARM_RASPBERRYPI_CPUFREQ=y Those are now available in Debian kernels, although the latter is '=m'. > CONFIG_DRM_V3D=m I have made a branch where that is (also) enabled ... > Simply compiling and loading v3d do not seem to enable DRM/GPU acceleration > on RPi4... We may need some work for enabling GPU acceleration on RPi series. The major missing piece AFAICT was enablement in DeviceTree. Recently a patch set was submitted that seems to contain the missing pieces and I added that to https://salsa.debian.org/diederik/linux/-/commits/rpi-enable-v3d https://lore.kernel.org/all/20220601110249.569540-1-pbrobin...@gmail.com/ is the upstream thread where I got the patches from. If you can build a kernel based on my branch and verify it then works, that would be great. Especially if you could send a "Tested-By <you>" email to that upstream thread which should help in getting the patch set accepted and eventually land in Linus' tree. Cheers, Diederik
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