[PATCH] net: qrtr: resend HELLO on MHI resume

[Daniel J Blueman <daniel@quora.org>]

Since the MHI HELLO exchange was relocated, it is sent only at device
registration. During a suspend-resume cycle, the firmware in WiFi
cards such as WCN7850 indefinitely waits for another HELLO,
triggering:

  ath12k_wifi7_pci 0004:01:00.0: timeout while waiting for restart complete
  ath12k_wifi7_pci 0004:01:00.0: failed to resume core: -110

Fix this by triggering the handshake from resume_early in the MHI
transport.

Validated on Qualcomm X1E-801800 on Lenovo Slim 7x across 10
suspend-resume cycles.

Fixes: 544d85de4dc2 ("net: qrtr: Send HELLO message on endpoint register")
Signed-off-by: Daniel J Blueman <daniel@quora.org>
---
 net/qrtr/af_qrtr.c | 13 +++++++++++++
 net/qrtr/mhi.c     | 10 +++++++++-
 net/qrtr/qrtr.h    |  2 ++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/net/qrtr/af_qrtr.c b/net/qrtr/af_qrtr.c
index 78347c937af7..2ffcfc2fdb4a 100644
--- a/net/qrtr/af_qrtr.c
+++ b/net/qrtr/af_qrtr.c
@@ -623,6 +623,19 @@ static void qrtr_hello_work(struct work_struct *work)
 	qrtr_port_put(ctrl);
 }
 
+/* Trigger the HELLO handshake after the remote has been reset, eg on resume */
+void qrtr_endpoint_hello(struct qrtr_endpoint *ep)
+{
+	struct qrtr_node *node = ep->node;
+
+	mutex_lock(&node->ep_lock);
+	node->hello_sent = false;
+	mutex_unlock(&node->ep_lock);
+
+	schedule_delayed_work(&node->say_hello, 0);
+}
+EXPORT_SYMBOL_GPL(qrtr_endpoint_hello);
+
 /**
  * qrtr_endpoint_register() - register a new endpoint
  * @ep: endpoint to register
diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c
index 3990da1a65dc..50326ffa3401 100644
--- a/net/qrtr/mhi.c
+++ b/net/qrtr/mhi.c
@@ -183,6 +183,7 @@ static int __maybe_unused qcom_mhi_qrtr_pm_suspend_late(struct device *dev)
 static int __maybe_unused qcom_mhi_qrtr_pm_resume_early(struct device *dev)
 {
 	struct mhi_device *mhi_dev = container_of(dev, struct mhi_device, dev);
+	struct qrtr_mhi_dev *qdev = dev_get_drvdata(dev);
 	enum mhi_state state;
 	int rc;
 
@@ -201,7 +201,13 @@ static int __maybe_unused qcom_mhi_qrtr_pm_resume_early(struct device *dev)
 		return rc;
 	}
 
-	return qcom_mhi_qrtr_queue_dl_buffers(mhi_dev);
+	rc = qcom_mhi_qrtr_queue_dl_buffers(mhi_dev);
+	if (rc)
+		return rc;
+
+	qrtr_endpoint_hello(&qdev->ep);
+
+	return 0;
 }
 
 static const struct dev_pm_ops qcom_mhi_qrtr_pm_ops = {
diff --git a/net/qrtr/qrtr.h b/net/qrtr/qrtr.h
index 3f2d28696062..de2de69a6199 100644
--- a/net/qrtr/qrtr.h
+++ b/net/qrtr/qrtr.h
@@ -27,6 +27,8 @@ int qrtr_endpoint_register(struct qrtr_endpoint *ep, unsigned int nid);
 
 void qrtr_endpoint_unregister(struct qrtr_endpoint *ep);
 
+void qrtr_endpoint_hello(struct qrtr_endpoint *ep);
+
 int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len);
 
 int qrtr_ns_init(void);
-- 
2.53.0