diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 8f7ed730426953ee0fa70cf10df51c2c6318bd0d..32c8c956d975ae4107df263c25446e0dac51545e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4994,7 +4994,7 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
 	} else if (is_sdvo && is_tv)
 		factor = 20;
 
-	if (clock.m1 < factor * clock.n)
+	if (clock.m < factor * clock.n)
 		fp |= FP_CB_TUNE;
 
 	dpll = 0;