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drm/amd/display: Add KUnit tests for dm_ism_dispatch_next_event

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[Why & How]
Add 6 KUnit test cases exercising the new helper:

- hyst_wait_no_delay: HYSTERESIS_WAITING + delay_ns==0
  returns IMMEDIATE (covers null stream / no hysteresis config).
- hyst_wait_with_delay: HYSTERESIS_WAITING + delay_ns>0
  returns DM_ISM_NUM_EVENTS (timer scheduled, no immediate event).
- opt_idle_no_sso_delay: OPTIMIZED_IDLE + sso_delay_ns==0
  returns IMMEDIATE (skip SSO, transition immediately).
- opt_idle_with_sso_delay: OPTIMIZED_IDLE + sso_delay_ns>0
  returns DM_ISM_NUM_EVENTS (SSO timer scheduled).
- timer_aborted: TIMER_ABORTED always returns IMMEDIATE
  regardless of delay values.
- no_action_state: all other states return DM_ISM_NUM_EVENTS.

Assisted-by: Copilot:Claude-Sonnet-4.6
Reviewed-by: Ray Wu <ray.wu@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Ray Wu <ray.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Hung 2026-05-15 13:28:05 -06:00 committed by Alex Deucher
parent f84c48048b
commit 64aa07084a
1 changed files with 87 additions and 0 deletions
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87
drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_ism_test.c
View File

@ -781,6 +781,86 @@ static void dm_test_ism_trigger_event_invalid_transition(struct kunit *test)
(int)DM_ISM_STATE_FULL_POWER_RUNNING);
}
/* ===== Tests for dm_ism_dispatch_next_event ===== */
/**
* dm_test_dispatch_next_event_hyst_wait_no_delay - zero delay_ns: IMMEDIATE in HYSTERESIS_WAITING
* @test: KUnit test context
*/
static void dm_test_dispatch_next_event_hyst_wait_no_delay(struct kunit *test)
{
enum amdgpu_dm_ism_event result;
result = dm_ism_dispatch_next_event(DM_ISM_STATE_HYSTERESIS_WAITING,
0, 0);
KUNIT_EXPECT_EQ(test, (int)result, (int)DM_ISM_EVENT_IMMEDIATE);
}
/**
* dm_test_dispatch_next_event_hyst_wait_with_delay - delay_ns > 0, no IMMEDIATE event returned
* @test: KUnit test context
*/
static void dm_test_dispatch_next_event_hyst_wait_with_delay(struct kunit *test)
{
enum amdgpu_dm_ism_event result;
result = dm_ism_dispatch_next_event(DM_ISM_STATE_HYSTERESIS_WAITING,
1000000, 0);
KUNIT_EXPECT_EQ(test, (int)result, (int)DM_ISM_NUM_EVENTS);
}
/**
* dm_test_dispatch_next_event_opt_idle_no_sso_delay - sso_delay_ns == 0 triggers IMMEDIATE event
* @test: KUnit test context
*/
static void dm_test_dispatch_next_event_opt_idle_no_sso_delay(struct kunit *test)
{
enum amdgpu_dm_ism_event result;
result = dm_ism_dispatch_next_event(DM_ISM_STATE_OPTIMIZED_IDLE,
0, 0);
KUNIT_EXPECT_EQ(test, (int)result, (int)DM_ISM_EVENT_IMMEDIATE);
}
/**
* dm_test_dispatch_next_event_opt_idle_with_sso_delay - sso_delay_ns > 0, SSO timer, no IMMEDIATE
* @test: KUnit test context
*/
static void dm_test_dispatch_next_event_opt_idle_with_sso_delay(struct kunit *test)
{
enum amdgpu_dm_ism_event result;
result = dm_ism_dispatch_next_event(DM_ISM_STATE_OPTIMIZED_IDLE,
0, 1000000);
KUNIT_EXPECT_EQ(test, (int)result, (int)DM_ISM_NUM_EVENTS);
}
/**
* dm_test_dispatch_next_event_timer_aborted - TIMER_ABORTED always returns IMMEDIATE
* @test: KUnit test context
*/
static void dm_test_dispatch_next_event_timer_aborted(struct kunit *test)
{
enum amdgpu_dm_ism_event result;
result = dm_ism_dispatch_next_event(DM_ISM_STATE_TIMER_ABORTED,
0, 0);
KUNIT_EXPECT_EQ(test, (int)result, (int)DM_ISM_EVENT_IMMEDIATE);
}
/**
* dm_test_dispatch_next_event_no_action_state - other states return DM_ISM_NUM_EVENTS
* @test: KUnit test context
*/
static void dm_test_dispatch_next_event_no_action_state(struct kunit *test)
{
enum amdgpu_dm_ism_event result;
result = dm_ism_dispatch_next_event(DM_ISM_STATE_FULL_POWER_RUNNING,
0, 0);
KUNIT_EXPECT_EQ(test, (int)result, (int)DM_ISM_NUM_EVENTS);
}
static struct kunit_case dm_ism_test_cases[] = {
/* dm_ism_next_state — FULL_POWER_RUNNING */
KUNIT_CASE(dm_test_ism_next_state_running_enter_idle),
@ -836,6 +916,13 @@ static struct kunit_case dm_ism_test_cases[] = {
/* dm_ism_trigger_event */
KUNIT_CASE(dm_test_ism_trigger_event_valid_transition),
KUNIT_CASE(dm_test_ism_trigger_event_invalid_transition),
/* dm_ism_dispatch_next_event */
KUNIT_CASE(dm_test_dispatch_next_event_hyst_wait_no_delay),
KUNIT_CASE(dm_test_dispatch_next_event_hyst_wait_with_delay),
KUNIT_CASE(dm_test_dispatch_next_event_opt_idle_no_sso_delay),
KUNIT_CASE(dm_test_dispatch_next_event_opt_idle_with_sso_delay),
KUNIT_CASE(dm_test_dispatch_next_event_timer_aborted),
KUNIT_CASE(dm_test_dispatch_next_event_no_action_state),
{}
};