drm/i915: Move backlight unregistration to connector unregistration

Currently the backlight is being unregistered in the unload phase (after
the display and its objects are unregistered). Move the backlight
unregistration into the analogous phase by performing it from the
connector unregistration, just prior to its deletion.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1466160034-12173-3-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/intel_display.c

@@ -16221,6 +16221,9 @@ void intel_modeset_gem_init(struct drm_device *dev)
 
 void intel_connector_unregister(struct drm_connector *connector)
 {
+	struct intel_connector *intel_connector = to_intel_connector(connector);
+
+	intel_backlight_device_unregister(intel_connector);
 	intel_panel_destroy_backlight(connector);
 }
 
@@ -16230,8 +16233,6 @@ void intel_modeset_cleanup(struct drm_device *dev)
 
 	intel_disable_gt_powersave(dev_priv);
 
-	intel_backlight_unregister(dev);
-
 	/*
 	 * Interrupts and polling as the first thing to avoid creating havoc.
 	 * Too much stuff here (turning of connectors, ...) would

drivers/gpu/drm/i915/intel_drv.h

@@ -1488,7 +1488,14 @@ extern struct drm_display_mode *intel_find_panel_downclock(
 				struct drm_display_mode *fixed_mode,
 				struct drm_connector *connector);
 void intel_backlight_register(struct drm_device *dev);
-void intel_backlight_unregister(struct drm_device *dev);
+
+#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
+void intel_backlight_device_unregister(struct intel_connector *connector);
+#else /* CONFIG_BACKLIGHT_CLASS_DEVICE */
+static inline void intel_backlight_device_unregister(struct intel_connector *connector)
+{
+}
+#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 
 /* intel_psr.c */

drivers/gpu/drm/i915/intel_panel.c

@@ -1216,7 +1216,7 @@ static int intel_backlight_device_register(struct intel_connector *connector)
 	return 0;
 }
 
-static void intel_backlight_device_unregister(struct intel_connector *connector)
+void intel_backlight_device_unregister(struct intel_connector *connector)
 {
 	struct intel_panel *panel = &connector->panel;
 
@@ -1230,9 +1230,6 @@ static int intel_backlight_device_register(struct intel_connector *connector)
 {
 	return 0;
 }
-static void intel_backlight_device_unregister(struct intel_connector *connector)
-{
-}
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 /*
@@ -1820,11 +1817,3 @@ void intel_backlight_register(struct drm_device *dev)
 	for_each_intel_connector(dev, connector)
 		intel_backlight_device_register(connector);
 }
-
-void intel_backlight_unregister(struct drm_device *dev)
-{
-	struct intel_connector *connector;
-
-	for_each_intel_connector(dev, connector)
-		intel_backlight_device_unregister(connector);
-}