r600_fmt_get_nblocksy
surf.nby = r600_fmt_get_nblocksy(surf.format, height);
surf.nby = r600_fmt_get_nblocksy(surf.format, h);
nby = r600_fmt_get_nblocksy(format, height);
tmp = r600_fmt_get_nblocksy(format, height) * r600_fmt_get_nblocksx(format, pitch) *
r600_fmt_get_nblocksy(format, height),
int r600_fmt_get_nblocksy(u32 format, u32 h);