drm/vc4: dsi: 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/20220711173939.1132294-37-maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_dsi.c

@@ -1729,6 +1729,10 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 
 	drm_encoder_helper_add(encoder, &vc4_dsi_encoder_helper_funcs);
 
+	ret = devm_pm_runtime_enable(dev);
+	if (ret)
+		return ret;
+
 	ret = drm_bridge_attach(encoder, dsi->bridge, NULL, 0);
 	if (ret)
 		return ret;
@@ -1741,8 +1745,6 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
 
 	vc4_debugfs_add_regset32(drm, dsi->variant->debugfs_name, &dsi->regset);
 
-	pm_runtime_enable(dev);
-
 	return 0;
 }
 
@@ -1752,8 +1754,6 @@ static void vc4_dsi_unbind(struct device *dev, struct device *master,
 	struct vc4_dsi *dsi = dev_get_drvdata(dev);
 	struct drm_encoder *encoder = &dsi->encoder.base;
 
-	pm_runtime_disable(dev);
-
 	/*
 	 * Restore the bridge_chain so the bridge detach procedure can happen
 	 * normally.