drm/tests: hdmi: Add connector disablement test

Atomic check should succeed when disabling a connector. Add a test
case drm_test_check_disabling_connector() to make sure of this.

Suggested-by: Dmitry Baryshkov <[email protected]>
Signed-off-by: Liu Ying <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

Author: Liu Ying

drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c

@@ -1568,6 +1568,57 @@ 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 atomic check succeeds when disabling a connector. */
+static void drm_test_check_disable_connector(struct kunit *test)
+{
+	struct drm_atomic_helper_connector_hdmi_priv *priv;
+	struct drm_modeset_acquire_ctx *ctx;
+	struct drm_connector_state *conn_state;
+	struct drm_crtc_state *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);
+
+	ctx = drm_kunit_helper_acquire_ctx_alloc(test);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
+
+	conn = &priv->connector;
+	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);
+
+	crtc_state = drm_atomic_get_crtc_state(state, crtc);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, crtc_state);
+
+	crtc_state->active = false;
+	ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	conn_state = drm_atomic_get_connector_state(state, conn);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, conn_state);
+
+	ret = drm_atomic_set_crtc_for_connector(conn_state, NULL);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+
+	ret = drm_atomic_check_only(state);
+	KUNIT_ASSERT_EQ(test, ret, 0);
+}
+
 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),
@@ -1582,6 +1633,7 @@ static struct kunit_case drm_atomic_helper_connector_hdmi_check_tests[] = {
 	 */
 	KUNIT_CASE(drm_test_check_broadcast_rgb_crtc_mode_changed),
 	KUNIT_CASE(drm_test_check_broadcast_rgb_crtc_mode_not_changed),
+	KUNIT_CASE(drm_test_check_disable_connector),
 	KUNIT_CASE(drm_test_check_hdmi_funcs_reject_rate),
 	KUNIT_CASE(drm_test_check_max_tmds_rate_bpc_fallback),
 	KUNIT_CASE(drm_test_check_max_tmds_rate_format_fallback),