diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7031757628ff..8620ea91e108 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -931,6 +931,7 @@ struct intel_gen6_power_mgmt {
 	u8 efficient_freq;	/* AKA RPe. Pre-determined balanced frequency */
 	u8 rp1_freq;		/* "less than" RP0 power/freqency */
 	u8 rp0_freq;		/* Non-overclocked max frequency. */
+	u32 cz_freq;
 
 	u32 ei_interrupt_count;
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2d2c4deb3e87..0ebe0f49db28 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5538,6 +5538,12 @@ enum punit_power_well {
 						 GEN6_PM_RP_DOWN_THRESHOLD | \
 						 GEN6_PM_RP_DOWN_TIMEOUT)
 
+#define CHV_CZ_CLOCK_FREQ_MODE_200			200
+#define CHV_CZ_CLOCK_FREQ_MODE_267			267
+#define CHV_CZ_CLOCK_FREQ_MODE_320			320
+#define CHV_CZ_CLOCK_FREQ_MODE_333			333
+#define CHV_CZ_CLOCK_FREQ_MODE_400			400
+
 #define GEN7_GT_SCRATCH_BASE			0x4F100
 #define GEN7_GT_SCRATCH_REG_NUM			8
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 8066ca5e2719..32ccd7a9378d 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5700,6 +5700,35 @@ static void valleyview_init_clock_gating(struct drm_device *dev)
 static void cherryview_init_clock_gating(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	u32 val;
+
+	mutex_lock(&dev_priv->rps.hw_lock);
+	val = vlv_punit_read(dev_priv, CCK_FUSE_REG);
+	mutex_unlock(&dev_priv->rps.hw_lock);
+	switch ((val >> 2) & 0x7) {
+	case 0:
+	case 1:
+			dev_priv->rps.cz_freq = CHV_CZ_CLOCK_FREQ_MODE_200;
+			dev_priv->mem_freq = 1600;
+			break;
+	case 2:
+			dev_priv->rps.cz_freq = CHV_CZ_CLOCK_FREQ_MODE_267;
+			dev_priv->mem_freq = 1600;
+			break;
+	case 3:
+			dev_priv->rps.cz_freq = CHV_CZ_CLOCK_FREQ_MODE_333;
+			dev_priv->mem_freq = 2000;
+			break;
+	case 4:
+			dev_priv->rps.cz_freq = CHV_CZ_CLOCK_FREQ_MODE_320;
+			dev_priv->mem_freq = 1600;
+			break;
+	case 5:
+			dev_priv->rps.cz_freq = CHV_CZ_CLOCK_FREQ_MODE_400;
+			dev_priv->mem_freq = 1600;
+			break;
+	}
+	DRM_DEBUG_DRIVER("DDR speed: %d MHz", dev_priv->mem_freq);
 
 	I915_WRITE(DSPCLK_GATE_D, VRHUNIT_CLOCK_GATE_DISABLE);