diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 895759b5569f..d3a3fba64361 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6514,7 +6514,7 @@ static void assert_can_disable_lcpll(struct drm_i915_private *dev_priv)
 
 	spin_lock_irqsave(&dev_priv->irq_lock, irqflags);
 	val = I915_READ(DEIMR);
-	WARN((val & ~DE_PCH_EVENT_IVB) != val,
+	WARN((val | DE_PCH_EVENT_IVB) != 0xffffffff,
 	     "Unexpected DEIMR bits enabled: 0x%x\n", val);
 	val = I915_READ(SDEIMR);
 	WARN((val | SDE_HOTPLUG_MASK_CPT) != 0xffffffff,