drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil

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commit 64566b5e76 upstream.

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>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Harry Wentland 2016-01-22 17:07:25 -05:00 • committed by Greg Kroah-Hartman

parent 2e614c5012

commit b870070037

1 changed files with 51 additions and 2 deletions

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include/drm/drm_fixed.h

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