Airlie: raspberry pi drivers are NOT useful

Kernel graphics maintainer Dave Airlie is rather unimpressed with the Raspberry Pi driver release; it is not something that will ever be merged. "Why is this bad?
You cannot make any improvements to their GLES implementation, you cannot add any new extensions, you can't fix any bugs, you can't do anything with it. You can't write a Mesa/Gallium driver for it. In other words you just can't."