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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