Sign bit wasn't handled properly and a small typo.
Thanks to Christian for helping me sort this out.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Required for certain driver calculations. Code
was written by Christian König and ported to the
drm by me.
v2: fix 64 bit divides
v3: fix 64 bit for real (math64.h)
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>