diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cb83fb7a8e0077c3f7d9da63d475fa272b26e8ab..1329420f4a1e984970c93f906c02b951f4177810 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2626,9 +2626,10 @@ enum skl_disp_power_wells {
 #define   GMBUS_PIN_DPB		5 /* SDVO, HDMIB */
 #define   GMBUS_PIN_DPD		6 /* HDMID */
 #define   GMBUS_PIN_RESERVED	7 /* 7 reserved */
-#define   GMBUS_PIN_1_BXT	1
+#define   GMBUS_PIN_1_BXT	1 /* BXT+ (atom) and CNP+ (big core) */
 #define   GMBUS_PIN_2_BXT	2
 #define   GMBUS_PIN_3_BXT	3
+#define   GMBUS_PIN_4_CNP	4
 #define   GMBUS_NUM_PINS	7 /* including 0 */
 #define GMBUS1			_MMIO(dev_priv->gpio_mmio_base + 0x5104) /* command/status */
 #define   GMBUS_SW_CLR_INT	(1<<31)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 41267ffb36248d13b9d7a7a300fc6ab6aac7185f..ec0779a52d5354a0d0f40aec373ec5e37661c622 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1802,19 +1802,21 @@ static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
 
 	switch (port) {
 	case PORT_B:
-		if (IS_GEN9_LP(dev_priv))
+		if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv))
 			ddc_pin = GMBUS_PIN_1_BXT;
 		else
 			ddc_pin = GMBUS_PIN_DPB;
 		break;
 	case PORT_C:
-		if (IS_GEN9_LP(dev_priv))
+		if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv))
 			ddc_pin = GMBUS_PIN_2_BXT;
 		else
 			ddc_pin = GMBUS_PIN_DPC;
 		break;
 	case PORT_D:
-		if (IS_CHERRYVIEW(dev_priv))
+		if (HAS_PCH_CNP(dev_priv))
+			ddc_pin = GMBUS_PIN_4_CNP;
+		else if (IS_CHERRYVIEW(dev_priv))
 			ddc_pin = GMBUS_PIN_DPD_CHV;
 		else
 			ddc_pin = GMBUS_PIN_DPD;
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index b6401e8f1bd63ca5bb8d603174a585f1479db57d..3c9e00d4ba5a5bcb176a23ff12621368ba83f38c 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -68,11 +68,20 @@ static const struct gmbus_pin gmbus_pins_bxt[] = {
 	[GMBUS_PIN_3_BXT] = { "misc", GPIOD },
 };
 
+static const struct gmbus_pin gmbus_pins_cnp[] = {
+	[GMBUS_PIN_1_BXT] = { "dpb", GPIOB },
+	[GMBUS_PIN_2_BXT] = { "dpc", GPIOC },
+	[GMBUS_PIN_3_BXT] = { "misc", GPIOD },
+	[GMBUS_PIN_4_CNP] = { "dpd", GPIOE },
+};
+
 /* pin is expected to be valid */
 static const struct gmbus_pin *get_gmbus_pin(struct drm_i915_private *dev_priv,
 					     unsigned int pin)
 {
-	if (IS_GEN9_LP(dev_priv))
+	if (HAS_PCH_CNP(dev_priv))
+		return &gmbus_pins_cnp[pin];
+	else if (IS_GEN9_LP(dev_priv))
 		return &gmbus_pins_bxt[pin];
 	else if (IS_GEN9_BC(dev_priv))
 		return &gmbus_pins_skl[pin];
@@ -87,7 +96,9 @@ bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
 {
 	unsigned int size;
 
-	if (IS_GEN9_LP(dev_priv))
+	if (HAS_PCH_CNP(dev_priv))
+		size = ARRAY_SIZE(gmbus_pins_cnp);
+	else if (IS_GEN9_LP(dev_priv))
 		size = ARRAY_SIZE(gmbus_pins_bxt);
 	else if (IS_GEN9_BC(dev_priv))
 		size = ARRAY_SIZE(gmbus_pins_skl);