diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d33de954a2e4..7df5a6318c51 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2345,7 +2345,7 @@ static int ilk_compute_pipe_wm(struct intel_crtc *intel_crtc,
 		pipe_wm->linetime = hsw_compute_linetime_wm(dev, cstate);
 
 	if (!ilk_validate_pipe_wm(dev, pipe_wm))
-		return false;
+		return -EINVAL;
 
 	ilk_compute_wm_reg_maximums(dev, 1, &max);