kernel/linux.git/drivers/gpu/drm/tests/drm_fixp_test.c, branch linux-7.0.yLinux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=linux-7.0.y2025-11-26T22:03:33+00:00drm/tests: Add a few tests around drm_fixed.h2025-11-26T22:03:33+00:00Harry Wentlandharry.wentland@amd.com2025-11-15T00:01:46+00:00urn:sha1:b7f513803bdff4d509093b9bfad881ff57ede321
While working on the CTM implementation of VKMS I had to ascertain
myself of a few assumptions. One of those is whether drm_fixed.h
treats its numbers using signed-magnitude or twos-complement. It is
twos-complement.
In order to make someone else's day easier I am adding the
drm_test_int2fixp test that validates the above assumption.
I am also adding a test for the new sm2fixp function that converts
from a signed-magnitude fixed point to the twos-complement fixed
point.
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patch.msgid.link/20251115000237.3561250-22-alex.hung@amd.com