drm/exynos: 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: Inki Dae <inki.dae@samsung.com>
Cc: Joonyoung Shim <jy0922.shim@samsung.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Inki Dae <inki.dae@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171205182504.41923-5-noralf@tronnes.org

drivers/gpu/drm/exynos/exynos_drm_drv.c

@@ -16,6 +16,7 @@
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
 
 #include <linux/component.h>
 
@@ -89,11 +90,6 @@ static void exynos_drm_postclose(struct drm_device *dev, struct drm_file *file)
 	file->driver_priv = NULL;
 }
 
-static void exynos_drm_lastclose(struct drm_device *dev)
-{
-	exynos_drm_fbdev_restore_mode(dev);
-}
-
 static const struct vm_operations_struct exynos_drm_gem_vm_ops = {
 	.fault = exynos_drm_gem_fault,
 	.open = drm_gem_vm_open,
@@ -140,7 +136,7 @@ static struct drm_driver exynos_drm_driver = {
 	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME
 				  | DRIVER_ATOMIC | DRIVER_RENDER,
 	.open			= exynos_drm_open,
-	.lastclose		= exynos_drm_lastclose,
+	.lastclose		= drm_fb_helper_lastclose,
 	.postclose		= exynos_drm_postclose,
 	.gem_free_object_unlocked = exynos_drm_gem_free_object,
 	.gem_vm_ops		= &exynos_drm_gem_vm_ops,

drivers/gpu/drm/exynos/exynos_drm_fb.c

@@ -205,7 +205,7 @@ static struct drm_mode_config_helper_funcs exynos_drm_mode_config_helpers = {
 
 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 	.fb_create = exynos_user_fb_create,
-	.output_poll_changed = exynos_drm_output_poll_changed,
+	.output_poll_changed = drm_fb_helper_output_poll_changed,
 	.atomic_check = exynos_atomic_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };

drivers/gpu/drm/exynos/exynos_drm_fbdev.c

@@ -270,24 +270,6 @@ void exynos_drm_fbdev_fini(struct drm_device *dev)
 	private->fb_helper = NULL;
 }
 
-void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
-{
-	struct exynos_drm_private *private = dev->dev_private;
-
-	if (!private || !private->fb_helper)
-		return;
-
-	drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
-}
-
-void exynos_drm_output_poll_changed(struct drm_device *dev)
-{
-	struct exynos_drm_private *private = dev->dev_private;
-	struct drm_fb_helper *fb_helper = private->fb_helper;
-
-	drm_fb_helper_hotplug_event(fb_helper);
-}
-
 void exynos_drm_fbdev_suspend(struct drm_device *dev)
 {
 	struct exynos_drm_private *private = dev->dev_private;

drivers/gpu/drm/exynos/exynos_drm_fbdev.h

@@ -19,8 +19,6 @@
 
 int exynos_drm_fbdev_init(struct drm_device *dev);
 void exynos_drm_fbdev_fini(struct drm_device *dev);
-void exynos_drm_fbdev_restore_mode(struct drm_device *dev);
-void exynos_drm_output_poll_changed(struct drm_device *dev);
 void exynos_drm_fbdev_suspend(struct drm_device *drm);
 void exynos_drm_fbdev_resume(struct drm_device *drm);