+static int is_backlight_combination_mode(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+
+ if (INTEL_INFO(dev)->gen >= 4)
+ return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;
+
+ if (IS_GEN2(dev))
+ return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;
+
+ return 0;
+}
+