The two main feature additions for the VC4 DRM driver are interlaced vblank timing and a memory/CPU overhead reduction when 3D rendering is taking place. The overhead reduction is from not forcing the new binner overflow allocation per-draw. Aside from the VC4 DRM driver work, with Linux 4.9 is where there finally might be mainline support for the Raspberry Pi Zero.
The VC4 pull into DRM-Next can be found here. The Linux 4.9 merge window should be open in early October.
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