drm/hisilicon: Use managed VRAM-helper initialization

updated to use drmm_vram_helper_init()
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1606964953-24309-1-git-send-email-tiantao6@hisilicon.com

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -249,7 +249,6 @@ static int hibmc_unload(struct drm_device *dev)
 
 	pci_disable_msi(dev->pdev);
 	hibmc_kms_fini(priv);
-	hibmc_mm_fini(priv);
 	dev->dev_private = NULL;
 	return 0;
 }

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h

@@ -64,7 +64,6 @@ int hibmc_de_init(struct hibmc_drm_private *priv);
 int hibmc_vdac_init(struct hibmc_drm_private *priv);
 
 int hibmc_mm_init(struct hibmc_drm_private *hibmc);
-void hibmc_mm_fini(struct hibmc_drm_private *hibmc);
 int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
 		      struct drm_mode_create_dumb *args);
 int hibmc_ddc_create(struct drm_device *drm_dev, struct hibmc_connector *connector);

drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c

@@ -23,15 +23,12 @@
 
 int hibmc_mm_init(struct hibmc_drm_private *hibmc)
 {
-	struct drm_vram_mm *vmm;
 	int ret;
 	struct drm_device *dev = &hibmc->dev;
 
-	vmm = drm_vram_helper_alloc_mm(dev,
-				       pci_resource_start(dev->pdev, 0),
+	ret = drmm_vram_helper_init(dev, pci_resource_start(dev->pdev, 0),
 				    hibmc->fb_size);
-	if (IS_ERR(vmm)) {
-		ret = PTR_ERR(vmm);
+	if (ret) {
 		drm_err(dev, "Error initializing VRAM MM; %d\n", ret);
 		return ret;
 	}
@@ -39,16 +36,6 @@ int hibmc_mm_init(struct hibmc_drm_private *hibmc)
 	return 0;
 }
 
-void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
-{
-	struct drm_device *dev = &hibmc->dev;
-
-	if (!dev->vram_mm)
-		return;
-
-	drm_vram_helper_release_mm(dev);
-}
-
 int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
 		      struct drm_mode_create_dumb *args)
 {