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// SPDX-License-Identifier: MIT
/*
* Copyright 2022 Advanced Micro Devices, Inc.
*/
#include <kunit/test.h>
#include <drm/drm_fixed.h>
static void drm_test_sm2fixp(struct kunit *test)
{
KUNIT_EXPECT_EQ(test, 0x7fffffffffffffffll, ((1ull << 63) - 1));
/* 1 */
KUNIT_EXPECT_EQ(test, drm_int2fixp(1), drm_sm2fixp(1ull << DRM_FIXED_POINT));
/* -1 */
KUNIT_EXPECT_EQ(test, drm_int2fixp(-1),
drm_sm2fixp((1ull << 63) | (1ull << DRM_FIXED_POINT)));
/* 0.5 */
KUNIT_EXPECT_EQ(test, drm_fixp_from_fraction(1, 2),
drm_sm2fixp(1ull << (DRM_FIXED_POINT - 1)));
/* -0.5 */
KUNIT_EXPECT_EQ(test, drm_fixp_from_fraction(-1, 2),
drm_sm2fixp((1ull << 63) | (1ull << (DRM_FIXED_POINT - 1))));
}
static void drm_test_int2fixp(struct kunit *test)
{
/* 1 */
KUNIT_EXPECT_EQ(test, 1ll << 32, drm_int2fixp(1));
/* -1 */
KUNIT_EXPECT_EQ(test, -(1ll << 32), drm_int2fixp(-1));
/* 1 + (-1) = 0 */
KUNIT_EXPECT_EQ(test, 0, drm_int2fixp(1) + drm_int2fixp(-1));
/* 1 / 2 */
KUNIT_EXPECT_EQ(test, 1ll << 31, drm_fixp_from_fraction(1, 2));
/* -0.5 */
KUNIT_EXPECT_EQ(test, -(1ll << 31), drm_fixp_from_fraction(-1, 2));
/* (1 / 2) + (-1) = 0.5 */
KUNIT_EXPECT_EQ(test, 1ll << 31, drm_fixp_from_fraction(-1, 2) + drm_int2fixp(1));
/* (1 / 2) - 1) = 0.5 */
KUNIT_EXPECT_EQ(test, -(1ll << 31), drm_fixp_from_fraction(1, 2) + drm_int2fixp(-1));
/* (1 / 2) - 1) = 0.5 */
KUNIT_EXPECT_EQ(test, -(1ll << 31), drm_fixp_from_fraction(1, 2) - drm_int2fixp(1));
}
static struct kunit_case drm_fixp_tests[] = {
KUNIT_CASE(drm_test_int2fixp),
KUNIT_CASE(drm_test_sm2fixp),
{ }
};
static struct kunit_suite drm_fixp_test_suite = {
.name = "drm_fixp",
.test_cases = drm_fixp_tests,
};
kunit_test_suite(drm_fixp_test_suite);
MODULE_AUTHOR("AMD");
MODULE_LICENSE("Dual MIT/GPL");
MODULE_DESCRIPTION("Unit tests for drm_fixed.h");
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