drm/tegra: 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: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171205182504.41923-12-noralf@tronnes.org

drivers/gpu/drm/tegra/drm.c

@@ -120,7 +120,7 @@ static int tegra_atomic_commit(struct drm_device *drm,
 static const struct drm_mode_config_funcs tegra_drm_mode_funcs = {
 	.fb_create = tegra_fb_create,
 #ifdef CONFIG_DRM_FBDEV_EMULATION
-	.output_poll_changed = tegra_fb_output_poll_changed,
+	.output_poll_changed = drm_fb_helper_output_poll_changed,
 #endif
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = tegra_atomic_commit,
@@ -286,15 +286,6 @@ static void tegra_drm_context_free(struct tegra_drm_context *context)
 	kfree(context);
 }
 
-static void tegra_drm_lastclose(struct drm_device *drm)
-{
-#ifdef CONFIG_DRM_FBDEV_EMULATION
-	struct tegra_drm *tegra = drm->dev_private;
-
-	tegra_fbdev_restore_mode(tegra->fbdev);
-#endif
-}
-
 static struct host1x_bo *
 host1x_bo_lookup(struct drm_file *file, u32 handle)
 {
@@ -1100,7 +1091,7 @@ static struct drm_driver tegra_drm_driver = {
 	.unload = tegra_drm_unload,
 	.open = tegra_drm_open,
 	.postclose = tegra_drm_postclose,
-	.lastclose = tegra_drm_lastclose,
+	.lastclose = drm_fb_helper_lastclose,
 
 #if defined(CONFIG_DEBUG_FS)
 	.debugfs_init = tegra_debugfs_init,

drivers/gpu/drm/tegra/drm.h

@@ -188,10 +188,6 @@ int tegra_drm_fb_init(struct drm_device *drm);
 void tegra_drm_fb_exit(struct drm_device *drm);
 void tegra_drm_fb_suspend(struct drm_device *drm);
 void tegra_drm_fb_resume(struct drm_device *drm);
-#ifdef CONFIG_DRM_FBDEV_EMULATION
-void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev);
-void tegra_fb_output_poll_changed(struct drm_device *drm);
-#endif
 
 extern struct platform_driver tegra_dc_driver;
 extern struct platform_driver tegra_hdmi_driver;

drivers/gpu/drm/tegra/fb.c

@@ -361,20 +361,6 @@ static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 	drm_fb_helper_fini(&fbdev->base);
 	tegra_fbdev_free(fbdev);
 }
-
-void tegra_fbdev_restore_mode(struct tegra_fbdev *fbdev)
-{
-	if (fbdev)
-		drm_fb_helper_restore_fbdev_mode_unlocked(&fbdev->base);
-}
-
-void tegra_fb_output_poll_changed(struct drm_device *drm)
-{
-	struct tegra_drm *tegra = drm->dev_private;
-
-	if (tegra->fbdev)
-		drm_fb_helper_hotplug_event(&tegra->fbdev->base);
-}
 #endif
 
 int tegra_drm_fb_prepare(struct drm_device *drm)