drm: Make drm_modeset_lock_crtc internal

This is only for legacy paths that need to grab the crtc/plane lock
combo. If you want to lock a crtc, just use drm_modeset_lock().
Reviewed-by: NHarry Wentland <harry.wentland@amd.com>
Reviewed-by: NMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170403083304.9083-2-daniel.vetter@ffwll.ch

drivers/gpu/drm/drm_crtc_internal.h

@@ -61,6 +61,9 @@ int drm_mode_getresources(struct drm_device *dev,
 			  void *data, struct drm_file *file_priv);
 
 
+/* drm_modeset_lock.c */
+void drm_modeset_lock_crtc(struct drm_crtc *crtc,
+			   struct drm_plane *plane);
 /* drm_dumb_buffers.c */
 /* IOCTLs */
 int drm_mode_create_dumb_ioctl(struct drm_device *dev,

drivers/gpu/drm/drm_modeset_lock.c

@@ -148,19 +148,6 @@ void drm_modeset_unlock_all(struct drm_device *dev)
 }
 EXPORT_SYMBOL(drm_modeset_unlock_all);
 
-/**
- * drm_modeset_lock_crtc - lock crtc with hidden acquire ctx for a plane update
- * @crtc: DRM CRTC
- * @plane: DRM plane to be updated on @crtc
- *
- * This function locks the given crtc and plane (which should be either the
- * primary or cursor plane) using a hidden acquire context. This is necessary so
- * that drivers internally using the atomic interfaces can grab further locks
- * with the lock acquire context.
- *
- * Note that @plane can be NULL, e.g. when the cursor support hasn't yet been
- * converted to universal planes yet.
- */
 void drm_modeset_lock_crtc(struct drm_crtc *crtc,
 			   struct drm_plane *plane)
 {
@@ -205,7 +192,6 @@ void drm_modeset_lock_crtc(struct drm_crtc *crtc,
 		goto retry;
 	}
 }
-EXPORT_SYMBOL(drm_modeset_lock_crtc);
 
 /**
  * drm_modeset_legacy_acquire_ctx - find acquire ctx for legacy ioctls

include/drm/drm_modeset_lock.h

@@ -121,8 +121,6 @@ struct drm_plane;
 
 void drm_modeset_lock_all(struct drm_device *dev);
 void drm_modeset_unlock_all(struct drm_device *dev);
-void drm_modeset_lock_crtc(struct drm_crtc *crtc,
-			   struct drm_plane *plane);
 void drm_modeset_unlock_crtc(struct drm_crtc *crtc);
 void drm_warn_on_modeset_not_all_locked(struct drm_device *dev);
 struct drm_modeset_acquire_ctx *