drm/i915: extract intel_init_fbc()

Because I plan to expand it a little bit.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_pm.c

@@ -7358,21 +7358,20 @@ void intel_fini_runtime_pm(struct drm_i915_private *dev_priv)
 	pm_runtime_disable(device);
 }
 
-/* Set up chip specific power management-related functions */
-void intel_init_pm(struct drm_device *dev)
+static void intel_init_fbc(struct drm_i915_private *dev_priv)
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
+	if (!HAS_FBC(dev_priv))
+		return;
 
-	if (HAS_FBC(dev)) {
-		if (INTEL_INFO(dev)->gen >= 7) {
+	if (INTEL_INFO(dev_priv)->gen >= 7) {
 		dev_priv->display.fbc_enabled = ironlake_fbc_enabled;
 		dev_priv->display.enable_fbc = gen7_enable_fbc;
 		dev_priv->display.disable_fbc = ironlake_disable_fbc;
-		} else if (INTEL_INFO(dev)->gen >= 5) {
+	} else if (INTEL_INFO(dev_priv)->gen >= 5) {
 		dev_priv->display.fbc_enabled = ironlake_fbc_enabled;
 		dev_priv->display.enable_fbc = ironlake_enable_fbc;
 		dev_priv->display.disable_fbc = ironlake_disable_fbc;
-		} else if (IS_GM45(dev)) {
+	} else if (IS_GM45(dev_priv)) {
 		dev_priv->display.fbc_enabled = g4x_fbc_enabled;
 		dev_priv->display.enable_fbc = g4x_enable_fbc;
 		dev_priv->display.disable_fbc = g4x_disable_fbc;
@@ -7384,7 +7383,14 @@ void intel_init_pm(struct drm_device *dev)
 		/* This value was pulled out of someone's hat */
 		I915_WRITE(FBC_CONTROL, 500 << FBC_CTL_INTERVAL_SHIFT);
 	}
-	}
+}
+
+/* Set up chip specific power management-related functions */
+void intel_init_pm(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+
+	intel_init_fbc(dev_priv);
 
 	/* For cxsr */
 	if (IS_PINEVIEW(dev))