drm/i915: Use dev_priv consistently through the intel_frontbuffer interface

Rather than a mismash of struct drm_device *dev and struct
drm_i915_private *dev_priv being used freely within a function, be
consistent and only pass along dev_priv.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470324762-2545-22-git-send-email-chris@chris-wilson.co.uk
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 53d97f6..0aadc65 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5228,7 +5228,7 @@
 
 /**
  * intel_edp_drrs_invalidate - Disable Idleness DRRS
- * @dev: DRM device
+ * @dev_priv: i915 device
  * @frontbuffer_bits: frontbuffer plane tracking bits
  *
  * This function gets called everytime rendering on the given planes start.
@@ -5236,10 +5236,9 @@
  *
  * Dirty frontbuffers relevant to DRRS are tracked in busy_frontbuffer_bits.
  */
-void intel_edp_drrs_invalidate(struct drm_device *dev,
-		unsigned frontbuffer_bits)
+void intel_edp_drrs_invalidate(struct drm_i915_private *dev_priv,
+			       unsigned int frontbuffer_bits)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_crtc *crtc;
 	enum pipe pipe;
 
@@ -5271,7 +5270,7 @@
 
 /**
  * intel_edp_drrs_flush - Restart Idleness DRRS
- * @dev: DRM device
+ * @dev_priv: i915 device
  * @frontbuffer_bits: frontbuffer plane tracking bits
  *
  * This function gets called every time rendering on the given planes has
@@ -5281,10 +5280,9 @@
  *
  * Dirty frontbuffers relevant to DRRS are tracked in busy_frontbuffer_bits.
  */
-void intel_edp_drrs_flush(struct drm_device *dev,
-		unsigned frontbuffer_bits)
+void intel_edp_drrs_flush(struct drm_i915_private *dev_priv,
+			  unsigned int frontbuffer_bits)
 {
-	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_crtc *crtc;
 	enum pipe pipe;