drm/panfrost: Remove opp table when unloading

The devfreq opp table needs to be removed when unloading the driver to
free the memory associated with it.

Signed-off-by: Steven Price <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panfrost/panfrost_devfreq.c

···
 		DRM_DEV_ERROR(&pfdev->pdev->dev, "Couldn't initialize GPU devfreq\n");
 		ret = PTR_ERR(pfdev->devfreq.devfreq);
 		pfdev->devfreq.devfreq = NULL;
+		dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
 		return ret;
 	}
 
 	return 0;
+}
+
+void panfrost_devfreq_fini(struct panfrost_device *pfdev)
+{
+	dev_pm_opp_of_remove_table(&pfdev->pdev->dev);
 }
 
 void panfrost_devfreq_resume(struct panfrost_device *pfdev)

drivers/gpu/drm/panfrost/panfrost_devfreq.h

···
 #define __PANFROST_DEVFREQ_H__
 
 int panfrost_devfreq_init(struct panfrost_device *pfdev);
+void panfrost_devfreq_fini(struct panfrost_device *pfdev);
 
 void panfrost_devfreq_resume(struct panfrost_device *pfdev);
 void panfrost_devfreq_suspend(struct panfrost_device *pfdev);

drivers/gpu/drm/panfrost/panfrost_drv.c

···
 	 */
 	err = drm_dev_register(ddev, 0);
 	if (err < 0)
-		goto err_out1;
+		goto err_out2;
 
 	panfrost_gem_shrinker_init(ddev);
 
 	return 0;
 
+err_out2:
+	panfrost_devfreq_fini(pfdev);
 err_out1:
 	panfrost_device_fini(pfdev);
 err_out0:
···
 	pm_runtime_get_sync(pfdev->dev);
 	pm_runtime_put_sync_autosuspend(pfdev->dev);
 	pm_runtime_disable(pfdev->dev);
+	panfrost_devfreq_fini(pfdev);
 	panfrost_device_fini(pfdev);
 	drm_dev_put(ddev);
 	return 0;