silmbus: ngd: register controller after power up.

Register slimbus controller only after finishing powerup sequnce so that we
do not endup in situation where core starts sending transactions before
the controller is ready.
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/slimbus/qcom-ngd-ctrl.c

@@ -1234,8 +1234,17 @@ static int qcom_slim_ngd_enable(struct qcom_slim_ngd_ctrl *ctrl, bool enable)
 			pm_runtime_resume(ctrl->dev);
 		pm_runtime_mark_last_busy(ctrl->dev);
 		pm_runtime_put(ctrl->dev);
+
+		ret = slim_register_controller(&ctrl->ctrl);
+		if (ret) {
+			dev_err(ctrl->dev, "error adding slim controller\n");
+			return ret;
+		}
+
+		dev_info(ctrl->dev, "SLIM controller Registered\n");
 	} else {
 		qcom_slim_qmi_exit(ctrl);
+		slim_unregister_controller(&ctrl->ctrl);
 	}
 
 	return 0;
@@ -1356,11 +1365,6 @@ static int qcom_slim_ngd_probe(struct platform_device *pdev)
 	int ret;
 
 	ctrl->ctrl.dev = dev;
-	ret = slim_register_controller(&ctrl->ctrl);
-	if (ret) {
-		dev_err(dev, "error adding slim controller\n");
-		return ret;
-	}
 
 	pm_runtime_use_autosuspend(dev);
 	pm_runtime_set_autosuspend_delay(dev, QCOM_SLIM_NGD_AUTOSUSPEND);
@@ -1370,7 +1374,7 @@ static int qcom_slim_ngd_probe(struct platform_device *pdev)
 	ret = qcom_slim_ngd_qmi_svc_event_init(ctrl);
 	if (ret) {
 		dev_err(&pdev->dev, "QMI service registration failed:%d", ret);
-		goto err;
+		return ret;
 	}
 
 	INIT_WORK(&ctrl->m_work, qcom_slim_ngd_master_worker);
@@ -1382,8 +1386,6 @@ static int qcom_slim_ngd_probe(struct platform_device *pdev)
 	}
 
 	return 0;
-err:
-	slim_unregister_controller(&ctrl->ctrl);
 wq_err:
 	qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi);
 	if (ctrl->mwq)
@@ -1456,7 +1458,7 @@ static int qcom_slim_ngd_remove(struct platform_device *pdev)
 	struct qcom_slim_ngd_ctrl *ctrl = platform_get_drvdata(pdev);
 
 	pm_runtime_disable(&pdev->dev);
-	slim_unregister_controller(&ctrl->ctrl);
+	qcom_slim_ngd_enable(ctrl, false);
 	qcom_slim_ngd_exit_dma(ctrl);
 	qcom_slim_ngd_qmi_svc_event_deinit(&ctrl->qmi);
 	if (ctrl->mwq)