diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0ad11d9c123fc8bc00e28ccc6e9cfde57f492413..d63997bc80e4a7a1a7b087abb0e8c8d019a03572 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3064,10 +3064,8 @@ void i915_teardown_sysfs(struct drm_device *dev_priv);
 /* intel_i2c.c */
 extern int intel_setup_gmbus(struct drm_device *dev);
 extern void intel_teardown_gmbus(struct drm_device *dev);
-static inline bool intel_gmbus_is_valid_pin(unsigned int pin)
-{
-	return (pin >= GMBUS_PIN_SSC && pin <= GMBUS_PIN_DPD);
-}
+extern bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
+				     unsigned int pin);
 
 extern struct i2c_adapter *
 intel_gmbus_get_adapter(struct drm_i915_private *dev_priv, unsigned int pin);
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 333f4079343528d81ce34d06b774f6d0a6faadcc..ad2f3b0d922f11e66918b4c54ca34eb4fc63e319 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -438,7 +438,7 @@ parse_general_definitions(struct drm_i915_private *dev_priv,
 		if (block_size >= sizeof(*general)) {
 			int bus_pin = general->crt_ddc_gmbus_pin;
 			DRM_DEBUG_KMS("crt_ddc_bus_pin: %d\n", bus_pin);
-			if (intel_gmbus_is_valid_pin(bus_pin))
+			if (intel_gmbus_is_valid_pin(dev_priv, bus_pin))
 				dev_priv->vbt.crt_ddc_pin = bus_pin;
 		} else {
 			DRM_DEBUG_KMS("BDB_GD too small (%d). Invalid.\n",
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c
index bfedea3826d76322d308a3756cb9736123fcd3c1..9a27ec7100efa0a7902b6c9e52ae2f955db14949 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -502,7 +502,7 @@ void intel_dvo_init(struct drm_device *dev)
 		 * special cases, but otherwise default to what's defined
 		 * in the spec.
 		 */
-		if (intel_gmbus_is_valid_pin(dvo->gpio))
+		if (intel_gmbus_is_valid_pin(dev_priv, dvo->gpio))
 			gpio = dvo->gpio;
 		else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 			gpio = GMBUS_PIN_SSC;
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index ff47a8fdcb6d9a3562b42d99a7ec537774419c72..ec9cc8cf642e623e82ee21bd83f13176eb7be8d5 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -49,6 +49,12 @@ static const struct gmbus_pin gmbus_pins[] = {
 	[GMBUS_PIN_DPD] = { "dpd", GPIOF },
 };
 
+bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
+			      unsigned int pin)
+{
+	return pin < ARRAY_SIZE(gmbus_pins) && gmbus_pins[pin].reg;
+}
+
 /* Intel GPIO access functions */
 
 #define I2C_RISEFALL_TIME 10
@@ -534,7 +540,7 @@ int intel_setup_gmbus(struct drm_device *dev)
 	init_waitqueue_head(&dev_priv->gmbus_wait_queue);
 
 	for (pin = 0; pin < ARRAY_SIZE(dev_priv->gmbus); pin++) {
-		if (!intel_gmbus_is_valid_pin(pin))
+		if (!intel_gmbus_is_valid_pin(dev_priv, pin))
 			continue;
 
 		bus = &dev_priv->gmbus[pin];
@@ -571,7 +577,7 @@ int intel_setup_gmbus(struct drm_device *dev)
 
 err:
 	while (--pin) {
-		if (!intel_gmbus_is_valid_pin(pin))
+		if (!intel_gmbus_is_valid_pin(dev_priv, pin))
 			continue;
 
 		bus = &dev_priv->gmbus[pin];
@@ -583,7 +589,7 @@ int intel_setup_gmbus(struct drm_device *dev)
 struct i2c_adapter *intel_gmbus_get_adapter(struct drm_i915_private *dev_priv,
 					    unsigned int pin)
 {
-	if (WARN_ON(!intel_gmbus_is_valid_pin(pin)))
+	if (WARN_ON(!intel_gmbus_is_valid_pin(dev_priv, pin)))
 		return NULL;
 
 	return &dev_priv->gmbus[pin].adapter;
@@ -613,7 +619,7 @@ void intel_teardown_gmbus(struct drm_device *dev)
 	unsigned int pin;
 
 	for (pin = 0; pin < ARRAY_SIZE(dev_priv->gmbus); pin++) {
-		if (!intel_gmbus_is_valid_pin(pin))
+		if (!intel_gmbus_is_valid_pin(dev_priv, pin))
 			continue;
 
 		bus = &dev_priv->gmbus[pin];
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index d61aa78ed7e3bc35b6b61ac1b3b0710d3be00ea4..314a5d56ace25cd727b5f90214390974a3268095 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -781,7 +781,7 @@ static bool lvds_is_present_in_vbt(struct drm_device *dev,
 		    child->device_type != DEVICE_TYPE_LFP)
 			continue;
 
-		if (intel_gmbus_is_valid_pin(child->i2c_pin))
+		if (intel_gmbus_is_valid_pin(dev_priv, child->i2c_pin))
 			*i2c_pin = child->i2c_pin;
 
 		/* However, we cannot trust the BIOS writers to populate
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 124992e48abd395f276c1ddc671efde67a7dc8cb..b121796c86aa91e9ad1439a95f12cbbaff091ae9 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -2291,7 +2291,8 @@ intel_sdvo_select_i2c_bus(struct drm_i915_private *dev_priv,
 	else
 		mapping = &dev_priv->sdvo_mappings[1];
 
-	if (mapping->initialized && intel_gmbus_is_valid_pin(mapping->i2c_pin))
+	if (mapping->initialized &&
+	    intel_gmbus_is_valid_pin(dev_priv, mapping->i2c_pin))
 		pin = mapping->i2c_pin;
 	else
 		pin = GMBUS_PIN_DPB;