[RFC PATCH] KMS support for i.MX51/53

Alan Cox alan at lxorguk.ukuu.org.uk
Tue Jun 7 07:17:01 EDT 2011

> Currently I don't use any sophisticated memory allocater like GEM
> or similar. I helped myself with simple dma_alloc where needed. At

GEM is actually pretty sane when you get your head around it a spot. The
main thing it took me a bit of time to get my head around is that it
allocates backing memory and handles but it doesn't allocate address
space on the card side.

For a minimal GEM take a look at drivers/staging/gma500/psb_gem.c. As I
need to use a GTT and allocate address space I also use a standard Linux
resource struct. If you just need to grab RAM and don't care about
address spaces then you are well away except for getting console support I

The GMS500 one has no magic interfaces for things like swapping objects,
as the card is just using it for 2D frame buffer objects so hopefully is
a bit easier to follow than the full works.


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