[PATCH v3 2/2] drm/tests: hdmi: Add connector's CRTC deactivation test

[Cristian Ciocaltea <cristian.ciocaltea@collabora.com>]

Following up a fixed bug in drm_atomic_helper_connector_hdmi_check(),
discovered while unloading a DRM module, add a test to make sure the
helper will not exhibit any abnormal behaviour for use cases that
involve shutting down the connector's CRTC.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
---
 drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c | 76 ++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
index c3b693bb966f1f8b04066d19f520bfa4bf11c23d..e6e79da200c4e81699c6e159a1bb2725004baf96 100644
--- a/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
+++ b/drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
@@ -1568,6 +1568,81 @@ static void drm_test_check_output_bpc_format_display_8bpc_only(struct kunit *tes
 	KUNIT_EXPECT_EQ(test, conn_state->hdmi.output_format, HDMI_COLORSPACE_RGB);
 }
 
+/*
+ * Test that if we deactivate connector's CRTC, we trigger a mode change
+ * on that CRTC, along with setting {connectors|active}_changed.
+ */
+static void drm_test_check_crtc_deactivate_mode_changed(struct kunit *test)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	struct drm_modeset_acquire_ctx *ctx;
+	struct drm_connector_state *old_conn_state;
+	struct drm_connector_state *new_conn_state;
+	struct drm_crtc_state *old_crtc_state;
+	struct drm_crtc_state *new_crtc_state;
+	struct drm_atomic_state *state;
+	struct drm_display_mode *preferred;
+	struct drm_connector *conn;
+	struct drm_device *drm;
+	struct drm_crtc *crtc;
+	int ret;
+
+	priv = drm_kunit_helper_connector_hdmi_init(test,
+						    BIT(HDMI_COLORSPACE_RGB),
+						    8);
+	KUNIT_ASSERT_NOT_NULL(test, priv);
+
+	conn = &priv->connector;
+	KUNIT_ASSERT_TRUE(test, conn->display_info.is_hdmi);
+
+	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
+	preferred = find_preferred_mode(conn);
+	KUNIT_ASSERT_NOT_NULL(test, preferred);
+
+	drm = &priv->drm;
+	crtc = priv->crtc;
+	ret = light_up_connector(test, drm, crtc, conn, preferred, ctx);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	state = drm_kunit_helper_atomic_state_alloc(test, drm, ctx);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, state);
+
+	new_conn_state = drm_atomic_get_connector_state(state, conn);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_conn_state);
+
+	old_conn_state = drm_atomic_get_old_connector_state(state, conn);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, old_conn_state);
+
+	new_crtc_state = drm_atomic_get_crtc_state(state, crtc);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_crtc_state);
+
+	old_crtc_state = drm_atomic_get_old_crtc_state(state, crtc);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, old_crtc_state);
+
+	ret = drm_atomic_set_mode_for_crtc(new_crtc_state, NULL);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+	KUNIT_ASSERT_NE(test, old_crtc_state->enable, new_crtc_state->enable);
+
+	new_crtc_state->active = false;
+	KUNIT_ASSERT_NE(test, old_crtc_state->active, new_crtc_state->active);
+
+	ret = drm_atomic_set_crtc_for_connector(new_conn_state, NULL);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	KUNIT_ASSERT_PTR_NE(test, old_conn_state->crtc, new_conn_state->crtc);
+
+	ret = drm_atomic_check_only(state);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+
+	new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, new_crtc_state);
+	KUNIT_EXPECT_TRUE(test, new_crtc_state->mode_changed);
+	KUNIT_EXPECT_TRUE(test, new_crtc_state->connectors_changed);
+	KUNIT_EXPECT_TRUE(test, new_crtc_state->active_changed);
+}
+
 static struct kunit_case drm_atomic_helper_connector_hdmi_check_tests[] = {
 	KUNIT_CASE(drm_test_check_broadcast_rgb_auto_cea_mode),
 	KUNIT_CASE(drm_test_check_broadcast_rgb_auto_cea_mode_vic_1),
@@ -1596,6 +1671,7 @@ static struct kunit_case drm_atomic_helper_connector_hdmi_check_tests[] = {
 	KUNIT_CASE(drm_test_check_tmds_char_rate_rgb_8bpc),
 	KUNIT_CASE(drm_test_check_tmds_char_rate_rgb_10bpc),
 	KUNIT_CASE(drm_test_check_tmds_char_rate_rgb_12bpc),
+	KUNIT_CASE(drm_test_check_crtc_deactivate_mode_changed),
 	/*
 	 * TODO: We should have tests to check that a change in the
 	 * format triggers a CRTC mode change just like we do for the

-- 
2.47.1