[PATCH] drm/radeon/kms: r600 CS parser fixes

[Andy Furniss]

Alex Deucher wrote:
> - buffer offsets in the base regs are 256b aligned so
> shift properly when comparing, fixed by Andre Maasikas
> - mipmap size was calculated wrong when nlevel=0
> - texture bo offsets were used after the bo base address was added
> - vertex resource size register is size - 1, not size

I tried this patch on a d-r-t from 100805 (todays d-r-t seems to have 
reverted to a month ago and doesn't work well with tiling)

The patch, while fixing mesa demos lodbias and cubemap, seems to regress 
ut2004 and doom3 demos -

radeon 0000:01:00.0: mipmap bo too small (128 128 4 0 7 393216 -> 458816 
have 655360)