drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil
authorHarry Wentland <harry.wentland@amd.com>
Fri, 22 Jan 2016 22:07:25 +0000 (17:07 -0500)
committerDave Airlie <airlied@redhat.com>
Fri, 5 Feb 2016 05:23:48 +0000 (15:23 +1000)
commit64566b5e767f9bc3161055ca1b443a51afb52aad
tree2c4c64d03f401f0f826f5abec33161155b8bb1cc
parent4d6a10da79fddcf7460299ab390da74ef2b592f6
drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil

drm_fixp_from_fraction allows us to create a fixed point directly
from a fraction, rather than creating fixed point values and dividing
later. This avoids overflow of our 64 bit value for large numbers.

drm_fixp2int_ceil allows us to return the ceiling of our fixed point
value.

[airlied: squash Jordan's fix]
32-bit-build-fix: Jordan Lazare <Jordan.Lazare@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Cc: stable@vger.kernel.org
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
include/drm/drm_fixed.h