drm/rockchip: Use drm_fb_helper_lastclose() and _poll_changed()

This driver can use drm_fb_helper_lastclose() as its .lastclose callback.
It can also use drm_fb_helper_output_poll_changed() as its
.output_poll_changed callback.

Cc: Mark Yao <mark.yao@rock-chips.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171205182504.41923-11-noralf@tronnes.org

drivers/gpu/drm/rockchip/rockchip_drm_drv.c

@@ -207,13 +207,6 @@ static void rockchip_drm_unbind(struct device *dev)
 	drm_dev_unref(drm_dev);
 }
 
-static void rockchip_drm_lastclose(struct drm_device *dev)
-{
-	struct rockchip_drm_private *priv = dev->dev_private;
-
-	drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
-}
-
 static const struct file_operations rockchip_drm_driver_fops = {
 	.owner = THIS_MODULE,
 	.open = drm_open,
@@ -228,7 +221,7 @@ static const struct file_operations rockchip_drm_driver_fops = {
 static struct drm_driver rockchip_drm_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_GEM |
 				  DRIVER_PRIME | DRIVER_ATOMIC,
-	.lastclose		= rockchip_drm_lastclose,
+	.lastclose		= drm_fb_helper_lastclose,
 	.gem_vm_ops		= &drm_gem_cma_vm_ops,
 	.gem_free_object_unlocked = rockchip_gem_free_object,
 	.dumb_create		= rockchip_gem_dumb_create,

drivers/gpu/drm/rockchip/rockchip_drm_fb.c

@@ -167,20 +167,13 @@ rockchip_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 	return ERR_PTR(ret);
 }
 
-static void rockchip_drm_output_poll_changed(struct drm_device *dev)
-{
-	struct rockchip_drm_private *private = dev->dev_private;
-
-	drm_fb_helper_hotplug_event(&private->fbdev_helper);
-}
-
 static const struct drm_mode_config_helper_funcs rockchip_mode_config_helpers = {
 	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
 };
 
 static const struct drm_mode_config_funcs rockchip_drm_mode_config_funcs = {
 	.fb_create = rockchip_user_fb_create,
-	.output_poll_changed = rockchip_drm_output_poll_changed,
+	.output_poll_changed = drm_fb_helper_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };