[Nouveau] Add pause/unpause methods for PFIFO & PGRAPH. Use them to get stable clock changes

[Martin Peres]

  Le 07/10/2010 03:33, Martin Peres a écrit :
>  Hi,
>
> Here is an updated version, all in one patch. When we agree on the 
> code, I'll split it into 3 patches.
>
Sorry, I forgot to attach it. Here it is.