[Intel-gfx] [PATCH 4/5] drm/i915: base gmbus pin validity check on the gmbus pin map array

[Jani Nikula]

This will be helpful for adding future platforms. It is better to keep
the information in the single point of truth (the table) instead of
duplicating it into the validity function.

While at it, add dev_priv parameter to the function, also to prepare for
adding future platform support.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h   |  6 ++----
 drivers/gpu/drm/i915/intel_bios.c |  2 +-
 drivers/gpu/drm/i915/intel_dvo.c  |  2 +-
 drivers/gpu/drm/i915/intel_i2c.c  | 14 ++++++++++----
 drivers/gpu/drm/i915/intel_lvds.c |  2 +-
 drivers/gpu/drm/i915/intel_sdvo.c |  3 ++-
 6 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0c6024101eb9..a1ba9bec8a6b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3048,10 +3048,8 @@ 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 333f40793435..ad2f3b0d922f 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 8d62272a3421..9670e3802939 100644
--- a/drivers/gpu/drm/i915/intel_dvo.c
+++ b/drivers/gpu/drm/i915/intel_dvo.c
@@ -500,7 +500,7 @@ 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 ff47a8fdcb6d..ec9cc8cf642e 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 @@ err:
 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 d61aa78ed7e3..314a5d56ace2 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 124992e48abd..b121796c86aa 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;
-- 
2.1.4