Compiling mesa3d for v3d vc5 broadcom gpu

[DAMAKsabeur]

Hello anholt,
I'm trying to use the v3d gallium driver to support egl, gles2 and Wayland-egl implementation for my 7271 based broadcom board
This board contain a vc5 GPU
Could you please tell me how to do it and which dependancies I have to cross compile.
It could be greatful if you could tell me too witch kernel flags I have to activate to get v3d DRM working
Regards

[anholt]

You'll need DRM_V3D in the kernel, and a devicetree node for v3d to match to (BOLT doesn't include that by default, so it's up to you to set that up. See Documentation/devicetree/bindings/gpu/brcm,bcm-v3d.txt).

For Mesa, it's just a normal Mesa build for your distribution with v3d in the meson gallium-drivers option. However, this only covers 3D rendering, and using dma-bufs to export the 3D rendering to whatever display stack you have is up to you.

[DAMAKsabeur]

Thanks a lot Anholt for your quick support.
First step is to compile all of them.
Now Linux kernel 4.19 compile well with drm_v3d support.
But for Mesa 3d libdrm support is required.
In libdrm I don't find v3d options
Only vc4 is supported in the case of bcm.
Is it really needed for mesa3d should I use a specific version of libdrm ?
Thanks

[anholt]

There's no v3d component to libdrm, just having the core be the version mesa needs should be sufficient.