diff --git a/drivers/mailbox/mtk-cmdq-mailbox.c b/drivers/mailbox/mtk-cmdq-mailbox.c
index 033aff11f87c..ac95b842044b 100644
--- a/drivers/mailbox/mtk-cmdq-mailbox.c
+++ b/drivers/mailbox/mtk-cmdq-mailbox.c
@@ -662,12 +662,6 @@ static int cmdq_probe(struct platform_device *pdev)
 		cmdq->mbox.chans[i].con_priv = (void *)&cmdq->thread[i];
 	}
 
-	err = devm_mbox_controller_register(dev, &cmdq->mbox);
-	if (err < 0) {
-		dev_err(dev, "failed to register mailbox: %d\n", err);
-		return err;
-	}
-
 	platform_set_drvdata(pdev, cmdq);
 
 	WARN_ON(clk_bulk_prepare(cmdq->pdata->gce_num, cmdq->clocks));
@@ -695,6 +689,12 @@ static int cmdq_probe(struct platform_device *pdev)
 	pm_runtime_set_autosuspend_delay(dev, CMDQ_MBOX_AUTOSUSPEND_DELAY_MS);
 	pm_runtime_use_autosuspend(dev);
 
+	err = devm_mbox_controller_register(dev, &cmdq->mbox);
+	if (err < 0) {
+		dev_err(dev, "failed to register mailbox: %d\n", err);
+		return err;
+	}
+
 	return 0;
 }