diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f235e8a48b3857cdbaefb1952581fb2d4987d059..b884932c2e00f14d756fca5b4165a7f1149725cc 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5469,7 +5469,8 @@ static void ironlake_fdi_set_m_n(struct drm_crtc *crtc)
 }
 
 static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
-				      intel_clock_t *clock, u32 *fp)
+				      intel_clock_t *clock, u32 *fp,
+				      intel_clock_t *reduced_clock, u32 *fp2)
 {
 	struct drm_crtc *crtc = &intel_crtc->base;
 	struct drm_device *dev = crtc->dev;
@@ -5511,6 +5512,9 @@ static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
 	if (clock->m < factor * clock->n)
 		*fp |= FP_CB_TUNE;
 
+	if (fp2 && (reduced_clock->m < factor * reduced_clock->n))
+		*fp2 |= FP_CB_TUNE;
+
 	dpll = 0;
 
 	if (is_lvds)
@@ -5626,7 +5630,8 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
 		fp2 = reduced_clock.n << 16 | reduced_clock.m1 << 8 |
 			reduced_clock.m2;
 
-	dpll = ironlake_compute_dpll(intel_crtc, &clock, &fp);
+	dpll = ironlake_compute_dpll(intel_crtc, &clock, &fp, &reduced_clock,
+				     has_reduced_clock ? &fp2 : NULL);
 
 	DRM_DEBUG_KMS("Mode for pipe %d:\n", pipe);
 	drm_mode_debug_printmodeline(mode);