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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* KUnit tests for amdgpu_dm_quirks.c
*
* Copyright 2026 Advanced Micro Devices, Inc.
*/
#include <kunit/test.h>
#include <linux/pci.h>
#include "dc.h"
#include "amdgpu_mode.h"
#include "amdgpu_dm.h"
/* Tests for retrieve_dmi_info() */
/*
* Verify that retrieve_dmi_info() always initialises aux_hpd_discon_quirk to
* false, even when the caller had previously set it to true.
*/
/**
* dm_test_quirks_aux_hpd_discon_reset - Test Quirks aux hpd discon reset
* @test: The KUnit test context
*/
static void dm_test_quirks_aux_hpd_discon_reset(struct kunit *test)
{
struct amdgpu_display_manager *dm;
dm = kunit_kzalloc(test, sizeof(*dm), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dm);
dm->aux_hpd_discon_quirk = true;
retrieve_dmi_info(dm);
/*
* In a KUnit / UML environment no real DMI table is present, so
* dmi_check_system() returns 0 and retrieve_dmi_info() leaves the
* quirk at its initialised-to-false value.
*/
KUNIT_EXPECT_FALSE(test, dm->aux_hpd_discon_quirk);
}
/*
* Verify that retrieve_dmi_info() always initialises edp0_on_dp1_quirk to
* false, even when the caller had previously set it to true.
*/
/**
* dm_test_quirks_edp0_on_dp1_reset - Test Quirks edp0 on dp1 reset
* @test: The KUnit test context
*/
static void dm_test_quirks_edp0_on_dp1_reset(struct kunit *test)
{
struct amdgpu_display_manager *dm;
dm = kunit_kzalloc(test, sizeof(*dm), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dm);
dm->edp0_on_dp1_quirk = true;
retrieve_dmi_info(dm);
KUNIT_EXPECT_FALSE(test, dm->edp0_on_dp1_quirk);
}
/*
* Verify that when no DMI match is found both quirks remain false after a
* fresh (zero-initialised) dm is passed to retrieve_dmi_info().
*/
/**
* dm_test_quirks_no_dmi_match_both_false - Test Quirks no dmi match both false
* @test: The KUnit test context
*/
static void dm_test_quirks_no_dmi_match_both_false(struct kunit *test)
{
struct amdgpu_display_manager *dm;
dm = kunit_kzalloc(test, sizeof(*dm), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dm);
retrieve_dmi_info(dm);
KUNIT_EXPECT_FALSE(test, dm->aux_hpd_discon_quirk);
KUNIT_EXPECT_FALSE(test, dm->edp0_on_dp1_quirk);
}
/* Tests for dm_should_disable_stutter() */
/**
* dm_test_should_disable_stutter_match - Test the quirk device matches
* @test: The KUnit test context
*/
static void dm_test_should_disable_stutter_match(struct kunit *test)
{
struct pci_dev *pdev;
pdev = kunit_kzalloc(test, sizeof(*pdev), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, pdev);
pdev->vendor = 0x1002;
pdev->device = 0x15dd;
pdev->subsystem_vendor = 0x1002;
pdev->subsystem_device = 0x15dd;
pdev->revision = 0xc8;
KUNIT_EXPECT_TRUE(test, dm_should_disable_stutter(pdev));
}
/**
* dm_test_should_disable_stutter_no_match - Test a non-quirk device does not match
* @test: The KUnit test context
*/
static void dm_test_should_disable_stutter_no_match(struct kunit *test)
{
struct pci_dev *pdev;
pdev = kunit_kzalloc(test, sizeof(*pdev), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, pdev);
pdev->vendor = 0x1002;
pdev->device = 0x1234;
KUNIT_EXPECT_FALSE(test, dm_should_disable_stutter(pdev));
}
/**
* dm_test_should_disable_stutter_revision_differs - Test a partial match (revision) fails
* @test: The KUnit test context
*/
static void dm_test_should_disable_stutter_revision_differs(struct kunit *test)
{
struct pci_dev *pdev;
pdev = kunit_kzalloc(test, sizeof(*pdev), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, pdev);
/* Everything matches the quirk except the revision */
pdev->vendor = 0x1002;
pdev->device = 0x15dd;
pdev->subsystem_vendor = 0x1002;
pdev->subsystem_device = 0x15dd;
pdev->revision = 0x00;
KUNIT_EXPECT_FALSE(test, dm_should_disable_stutter(pdev));
}
static struct kunit_case amdgpu_dm_quirks_tests[] = {
/* retrieve_dmi_info */
KUNIT_CASE(dm_test_quirks_aux_hpd_discon_reset),
KUNIT_CASE(dm_test_quirks_edp0_on_dp1_reset),
KUNIT_CASE(dm_test_quirks_no_dmi_match_both_false),
/* dm_should_disable_stutter */
KUNIT_CASE(dm_test_should_disable_stutter_match),
KUNIT_CASE(dm_test_should_disable_stutter_no_match),
KUNIT_CASE(dm_test_should_disable_stutter_revision_differs),
{}
};
static struct kunit_suite amdgpu_dm_quirks_test_suite = {
.name = "amdgpu_dm_quirks",
.test_cases = amdgpu_dm_quirks_tests,
};
kunit_test_suite(amdgpu_dm_quirks_test_suite);
MODULE_AUTHOR("AMD");
MODULE_DESCRIPTION("KUnit tests for amdgpu_dm_quirks");
MODULE_LICENSE("Dual MIT/GPL");
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