drm/i915: Simplify intel_mark_busy/idle

They use dev_priv exclusively so pass it in instead of dev
for smaller source and binary.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1461844620-35360-1-git-send-email-tvrtko.ursulin@linux.intel.com
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0fccebb..4a9abb0 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10802,31 +10802,27 @@
 	return mode;
 }
 
-void intel_mark_busy(struct drm_device *dev)
+void intel_mark_busy(struct drm_i915_private *dev_priv)
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
-
 	if (dev_priv->mm.busy)
 		return;
 
 	intel_runtime_pm_get(dev_priv);
 	i915_update_gfx_val(dev_priv);
-	if (INTEL_INFO(dev)->gen >= 6)
+	if (INTEL_GEN(dev_priv) >= 6)
 		gen6_rps_busy(dev_priv);
 	dev_priv->mm.busy = true;
 }
 
-void intel_mark_idle(struct drm_device *dev)
+void intel_mark_idle(struct drm_i915_private *dev_priv)
 {
-	struct drm_i915_private *dev_priv = dev->dev_private;
-
 	if (!dev_priv->mm.busy)
 		return;
 
 	dev_priv->mm.busy = false;
 
-	if (INTEL_INFO(dev)->gen >= 6)
-		gen6_rps_idle(dev->dev_private);
+	if (INTEL_GEN(dev_priv) >= 6)
+		gen6_rps_idle(dev_priv);
 
 	intel_runtime_pm_put(dev_priv);
 }