drm/ast: Use managed pci functions

Allows us to remove a bit of cleanup code.
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Emil Velikov <emil.velikov@collabora.com>
Cc: "Noralf Trønnes" <noralf@tronnes.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "Y.C. Chen" <yc_chen@aspeedtech.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200415074034.175360-58-daniel.vetter@ffwll.ch

drivers/gpu/drm/ast/ast_drv.c

@@ -91,15 +91,13 @@ static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	ast_kick_out_firmware_fb(pdev);
 
-	ret = pci_enable_device(pdev);
+	ret = pcim_enable_device(pdev);
 	if (ret)
 		return ret;
 
 	dev = drm_dev_alloc(&driver, &pdev->dev);
-	if (IS_ERR(dev)) {
-		ret = PTR_ERR(dev);
-		goto err_pci_disable_device;
-	}
+	if (IS_ERR(dev))
+		return  PTR_ERR(dev);
 
 	dev->pdev = pdev;
 	pci_set_drvdata(pdev, dev);
@@ -120,8 +118,6 @@ static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	ast_driver_unload(dev);
 err_drm_dev_put:
 	drm_dev_put(dev);
-err_pci_disable_device:
-	pci_disable_device(pdev);
 	return ret;
 
 }

drivers/gpu/drm/ast/ast_main.c

@@ -531,8 +531,5 @@ void ast_driver_unload(struct drm_device *dev)
 	drm_mode_config_cleanup(dev);
 
 	ast_mm_fini(ast);
-	if (ast->ioregs != ast->regs + AST_IO_MM_OFFSET)
-		pci_iounmap(dev->pdev, ast->ioregs);
-	pci_iounmap(dev->pdev, ast->regs);
 	kfree(ast);
 }