drm/i915: dev_priv cleanup in i915_suspend.c

And a little bit of function prototype changes.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 2c747ac..b0e1e7c 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -29,12 +29,10 @@
 #include "intel_drv.h"
 #include "i915_reg.h"
 
-static void i915_save_display(struct drm_device *dev)
+static void i915_save_display(struct drm_i915_private *dev_priv)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
-
 	/* Display arbitration control */
-	if (INTEL_INFO(dev)->gen <= 4)
+	if (INTEL_GEN(dev_priv) <= 4)
 		dev_priv->regfile.saveDSPARB = I915_READ(DSPARB);
 
 	/* save FBC interval */
@@ -42,12 +40,10 @@
 		dev_priv->regfile.saveFBC_CONTROL = I915_READ(FBC_CONTROL);
 }
 
-static void i915_restore_display(struct drm_device *dev)
+static void i915_restore_display(struct drm_i915_private *dev_priv)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
-
 	/* Display arbitration */
-	if (INTEL_INFO(dev)->gen <= 4)
+	if (INTEL_GEN(dev_priv) <= 4)
 		I915_WRITE(DSPARB, dev_priv->regfile.saveDSPARB);
 
 	/* only restore FBC info on the platform that supports FBC*/
@@ -57,7 +53,7 @@
 	if (HAS_FBC(dev_priv) && INTEL_GEN(dev_priv) <= 4 && !IS_G4X(dev_priv))
 		I915_WRITE(FBC_CONTROL, dev_priv->regfile.saveFBC_CONTROL);
 
-	i915_redisable_vga(dev);
+	i915_redisable_vga(dev_priv);
 }
 
 int i915_save_state(struct drm_device *dev)
@@ -68,14 +64,14 @@
 
 	mutex_lock(&dev->struct_mutex);
 
-	i915_save_display(dev);
+	i915_save_display(dev_priv);
 
 	if (IS_GEN4(dev_priv))
 		pci_read_config_word(pdev, GCDGMBUS,
 				     &dev_priv->regfile.saveGCDGMBUS);
 
 	/* Cache mode state */
-	if (INTEL_INFO(dev)->gen < 7)
+	if (INTEL_GEN(dev_priv) < 7)
 		dev_priv->regfile.saveCACHE_MODE_0 = I915_READ(CACHE_MODE_0);
 
 	/* Memory Arbitration state */
@@ -119,10 +115,10 @@
 	if (IS_GEN4(dev_priv))
 		pci_write_config_word(pdev, GCDGMBUS,
 				      dev_priv->regfile.saveGCDGMBUS);
-	i915_restore_display(dev);
+	i915_restore_display(dev_priv);
 
 	/* Cache mode state */
-	if (INTEL_INFO(dev)->gen < 7)
+	if (INTEL_GEN(dev_priv) < 7)
 		I915_WRITE(CACHE_MODE_0, dev_priv->regfile.saveCACHE_MODE_0 |
 			   0xffff0000);