drm/i915: Split skl_update_scaler, v4.

commit 2c310b9d2859863826c3688c88218d607d5dd19a
Author: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Date:   Mon May 18 12:28:52 2015 +0200

drm/i915: Split skl_update_scaler, v4.

It's easier to read separate functions for crtc and plane scaler state.

Changes since v1:
 - Update documentation.
Changes since v2:
 - Get rid of parameters to skl_update_scaler only used for traces.
   This avoids needing to document the other parameters.
Changes since v3:
 - Rename scaler_idx to scaler_user.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Tested-by(IVB): Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 02b18a1..2436af9 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -263,7 +263,7 @@
 	 * plane requiring a scaler:
 	 *   - During check_plane, its bit is set in
 	 *     crtc_state->scaler_state.scaler_users by calling helper function
-	 *     update_scaler_users.
+	 *     update_scaler_plane.
 	 *   - scaler_id indicates the scaler it got assigned.
 	 *
 	 * plane doesn't require a scaler:
@@ -271,7 +271,7 @@
 	 *     got disabled.
 	 *   - During check_plane, corresponding bit is reset in
 	 *     crtc_state->scaler_state.scaler_users by calling helper function
-	 *     update_scaler_users.
+	 *     update_scaler_plane.
 	 */
 	int scaler_id;
 };
@@ -1148,9 +1148,11 @@
 void intel_crtc_wait_for_pending_flips(struct drm_crtc *crtc);
 void intel_modeset_preclose(struct drm_device *dev, struct drm_file *file);
 void skl_detach_scalers(struct intel_crtc *intel_crtc);
-int skl_update_scaler_users(struct intel_crtc *intel_crtc,
-	struct intel_crtc_state *crtc_state, struct intel_plane *intel_plane,
-	struct intel_plane_state *plane_state, int force_detach);
+int skl_update_scaler_plane(struct intel_crtc_state *crtc_state,
+			    struct intel_plane *intel_plane,
+			    struct intel_plane_state *plane_state);
+
+int skl_update_scaler_crtc(struct intel_crtc_state *crtc_state, int force_detach);
 int skl_max_scale(struct intel_crtc *crtc, struct intel_crtc_state *crtc_state);
 
 unsigned long intel_plane_obj_offset(struct intel_plane *intel_plane,