drm/vc4: v3d: Switch to devm_pm_runtime_enable

devm_pm_runtime_enable() simplifies the driver a bit since it will call
pm_runtime_disable() automatically through a device-managed action.
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220711173939.1132294-70-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_v3d.c

@@ -468,11 +468,13 @@ static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 	vc4->irq = ret;
 
-	pm_runtime_enable(dev);
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return ret;
 
 	ret = pm_runtime_resume_and_get(dev);
 	if (ret)
-		goto err_disable_runtime_pm;
+		return ret;
 
 	if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
 		DRM_ERROR("V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
@@ -501,9 +503,6 @@ static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
 err_put_runtime_pm:
 	pm_runtime_put(dev);
 
-err_disable_runtime_pm:
-	pm_runtime_disable(dev);
-
 	return ret;
 }
 
@@ -513,8 +512,6 @@ static void vc4_v3d_unbind(struct device *dev, struct device *master,
 	struct drm_device *drm = dev_get_drvdata(master);
 	struct vc4_dev *vc4 = to_vc4_dev(drm);
 
-	pm_runtime_disable(dev);
-
 	vc4_irq_uninstall(drm);
 
 	/* Disable the binner's overflow memory address, so the next