3 files changed, 5 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 7ea373ffe7a1..8d49a964cb2c 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1239,7 +1239,7 @@ void intel_disable_ddi(struct intel_encoder *encoder)
         /* This will be needed in the future, so leave it here for now */
 }
 
-static int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
+int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)
 {
         if (I915_READ(HSW_FUSE_STRAP) & HSW_CDCLK_LIMIT)
                 return 450;
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 7e3c1deb80b1..8c9bbc2f456b 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -370,7 +370,9 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
          * clock divider.
          */
         if (is_cpu_edp(intel_dp)) {
-                if (IS_VALLEYVIEW(dev))
+                if (IS_HASWELL(dev))
+                        aux_clock_divider = intel_ddi_get_cdclk_freq(dev_priv) >> 1;
+                else if (IS_VALLEYVIEW(dev))
                         aux_clock_divider = 100;
                 else if (IS_GEN6(dev) || IS_GEN7(dev))
                         aux_clock_divider = 200; /* SNB & IVB eDP input clock at 400Mhz */
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 2ad70d744232..ff2000a16236 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -608,6 +608,7 @@ extern bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
 extern void intel_ddi_mode_set(struct drm_encoder *encoder,
                                 struct drm_display_mode *mode,
                                 struct drm_display_mode *adjusted_mode);
+extern int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv);
 extern void intel_ddi_pll_init(struct drm_device *dev);
 extern void intel_ddi_enable_pipe_func(struct drm_crtc *crtc);
 extern void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv,