On Fri, 2016-12-09 at 08:23 +1100, Benjamin Herrenschmidt wrote:

quoted

From memory, David claimed you cannot directly work on the fb with a "proper"

DRM driver. Maybe I misunderstood but then the DRM shines by its complete
absence of useful documentation 

That sentence should have been in the past, it does look like
documentation has been landing in the tree this year ! yay ! I'll go
off read it.

mixed with bazillion layers of APIs and helpers
so it's pretty hard to get ones head around it without wasting very large amounts
of time which I don't have at the moment.

Ben.