[PATCH] very rough cut at EXA support for trident blade

[Jesse Barnes]

Thanks to a quick review by ajax and anholt, the blt corruption has been 
fixed as well as a planemask bug.  The driver seems to work ok with a 
full KDE desktop running now, though EXA doesn't really like the fact 
that the card can't handle mixed x & y direction blts, so some of them 
fall back to software, which is quite visible on this machine.  XAA had 
a flag to describe this sort of blt behavior and worked around it 
(presumably by only passing down regions that could be copied 
efficiently), maybe EXA needs that too?

Anyway, now on to the rest of the TODO list, upload/download support, 
Xv, and composite hook accel.

Thanks,
Jesse
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