diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index ee87ca7420de038838be5562018b2934128f5655..402769d9d840f3bb9626f780c3472b48f832aeca 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -1140,6 +1140,9 @@ bool intel_engine_is_idle(struct intel_engine_cs *engine)
 			       intel_engine_last_submit(engine)))
 		return false;
 
+	if (I915_SELFTEST_ONLY(engine->breadcrumbs.mock))
+		return true;
+
 	/* Interrupt/tasklet pending? */
 	if (test_bit(ENGINE_IRQ_EXECLIST, &engine->irq_posted))
 		return false;