ath10k: add support for WCN3990 firmware crash recovery

Whenever the WCN3990 firmware becomes unavailable,
the host driver receives a FW down indication, post
which all the direct hardware register access should
be avoided, in order to prevent improper behavior in
the host driver.

Set the crash_flush flag when the host driver receives
a FW_DOWN_IND via qmi, in order to stop the untimely
hardware register access. Also handle the case, where
we need to do core register only for the first FW_READY
indication, which is when we initialize the host driver.
All the subsequent FW_READY indication will be received
in subsystem recovery case and we only need to do the
restart work. The state of driver is maintained using
flags to distinguish between first and subsequent FW_READY
indication received.

Tested HW: WCN3990
Tested FW: WLAN.HL.2.0-01188-QCAHLSWMTPLZ-1

Signed-off-by: Surabhi Vishnoi <svishnoi@codeaurora.org>
Signed-off-by: Rakesh Pillai <pillair@codeaurora.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 36 insertions, 3 deletions

diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
index 8d3d9bca410f..98724d04baef 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.c
+++ b/drivers/net/wireless/ath/ath10k/snoc.c
@@ -918,7 +918,9 @@ static void ath10k_snoc_buffer_cleanup(struct ath10k *ar)
 
 static void ath10k_snoc_hif_stop(struct ath10k *ar)
 {
-	ath10k_snoc_irq_disable(ar);
+	if (!test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags))
+		ath10k_snoc_irq_disable(ar);
+
 	napi_synchronize(&ar->napi);
 	napi_disable(&ar->napi);
 	ath10k_snoc_buffer_cleanup(ar);
@@ -927,10 +929,14 @@ static void ath10k_snoc_hif_stop(struct ath10k *ar)
 
 static int ath10k_snoc_hif_start(struct ath10k *ar)
 {
+	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
+
 	napi_enable(&ar->napi);
 	ath10k_snoc_irq_enable(ar);
 	ath10k_snoc_rx_post(ar);
 
+	clear_bit(ATH10K_SNOC_FLAG_RECOVERY, &ar_snoc->flags);
+
 	ath10k_dbg(ar, ATH10K_DBG_BOOT, "boot hif start\n");
 
 	return 0;
@@ -994,7 +1000,8 @@ static int ath10k_snoc_wlan_enable(struct ath10k *ar)
 
 static void ath10k_snoc_wlan_disable(struct ath10k *ar)
 {
-	ath10k_qmi_wlan_disable(ar);
+	if (!test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags))
+		ath10k_qmi_wlan_disable(ar);
 }
 
 static void ath10k_snoc_hif_power_down(struct ath10k *ar)
@@ -1091,6 +1098,11 @@ static int ath10k_snoc_napi_poll(struct napi_struct *ctx, int budget)
 	struct ath10k *ar = container_of(ctx, struct ath10k, napi);
 	int done = 0;
 
+	if (test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags)) {
+		napi_complete(ctx);
+		return done;
+	}
+
 	ath10k_ce_per_engine_service_any(ar);
 	done = ath10k_htt_txrx_compl_task(ar, budget);
 
@@ -1187,17 +1199,29 @@ int ath10k_snoc_fw_indication(struct ath10k *ar, u64 type)
 	struct ath10k_bus_params bus_params;
 	int ret;
 
+	if (test_bit(ATH10K_SNOC_FLAG_UNREGISTERING, &ar_snoc->flags))
+		return 0;
+
 	switch (type) {
 	case ATH10K_QMI_EVENT_FW_READY_IND:
+		if (test_bit(ATH10K_SNOC_FLAG_REGISTERED, &ar_snoc->flags)) {
+			queue_work(ar->workqueue, &ar->restart_work);
+			break;
+		}
+
 		bus_params.dev_type = ATH10K_DEV_TYPE_LL;
 		bus_params.chip_id = ar_snoc->target_info.soc_version;
 		ret = ath10k_core_register(ar, &bus_params);
 		if (ret) {
-			ath10k_err(ar, "failed to register driver core: %d\n",
+			ath10k_err(ar, "Failed to register driver core: %d\n",
 				   ret);
+			return ret;
 		}
+		set_bit(ATH10K_SNOC_FLAG_REGISTERED, &ar_snoc->flags);
 		break;
 	case ATH10K_QMI_EVENT_FW_DOWN_IND:
+		set_bit(ATH10K_SNOC_FLAG_RECOVERY, &ar_snoc->flags);
+		set_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags);
 		break;
 	default:
 		ath10k_err(ar, "invalid fw indication: %llx\n", type);
@@ -1628,8 +1652,17 @@ err_core_destroy:
 static int ath10k_snoc_remove(struct platform_device *pdev)
 {
 	struct ath10k *ar = platform_get_drvdata(pdev);
+	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
 
 	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc remove\n");
+
+	reinit_completion(&ar->driver_recovery);
+
+	if (test_bit(ATH10K_SNOC_FLAG_RECOVERY, &ar_snoc->flags))
+		wait_for_completion_timeout(&ar->driver_recovery, 3 * HZ);
+
+	set_bit(ATH10K_SNOC_FLAG_UNREGISTERING, &ar_snoc->flags);
+
 	ath10k_core_unregister(ar);
 	ath10k_hw_power_off(ar);
 	ath10k_snoc_free_irq(ar);