linux-kernel - [PATCH 04/10] wifi: ath12k: fix firmware assert during reboot with hardware grouping

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Message-ID: <20250109-fix_reboot_issues_with_hw_grouping-v1-4-fb39ec03451e@quicinc.com>
Date: Thu, 9 Jan 2025 09:55:32 +0530
From: Aditya Kumar Singh <quic_adisi@...cinc.com>
To: Kalle Valo <kvalo@...nel.org>, Jeff Johnson <jjohnson@...nel.org>,
        Karthikeyan Periyasamy <quic_periyasa@...cinc.com>,
        Harshitha Prem
	<quic_hprem@...cinc.com>
CC: Jeff Johnson <jeff.johnson@....qualcomm.com>,
        Kalle Valo
	<quic_kvalo@...cinc.com>, <linux-wireless@...r.kernel.org>,
        <ath12k@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        "Aditya Kumar
 Singh" <quic_adisi@...cinc.com>
Subject: [PATCH 04/10] wifi: ath12k: fix firmware assert during reboot with
 hardware grouping

At present, during PCI shutdown, the power down is only executed for a
single device. However, when operating in a group, all devices need to be
powered down simultaneously. Failure to do so will result in a firmware
assertion.

Hence, introduce a new ath12k_pci_hw_group_power_down() and call it during
power down. This will ensure that all partner devices are properly powered
down.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: Aditya Kumar Singh <quic_adisi@...cinc.com>
---
 drivers/net/wireless/ath/ath12k/pci.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c
index 837be309cd45a2d037ee8c3bba8f7be0f457d6b2..7f6521a56ffc0f1e9687c94d6829a9c1f1887661 100644
--- a/drivers/net/wireless/ath/ath12k/pci.c
+++ b/drivers/net/wireless/ath/ath12k/pci.c
@@ -1751,13 +1751,34 @@ static void ath12k_pci_remove(struct pci_dev *pdev)
 	ath12k_core_free(ab);
 }
 
+static void ath12k_pci_hw_group_power_down(struct ath12k_hw_group *ag)
+{
+	struct ath12k_base *ab;
+	int i;
+
+	if (!ag)
+		return;
+
+	mutex_lock(&ag->mutex);
+
+	for (i = 0; i < ag->num_devices; i++) {
+		ab = ag->ab[i];
+		if (!ab)
+			continue;
+
+		ath12k_pci_power_down(ab, false);
+	}
+
+	mutex_unlock(&ag->mutex);
+}
+
 static void ath12k_pci_shutdown(struct pci_dev *pdev)
 {
 	struct ath12k_base *ab = pci_get_drvdata(pdev);
 	struct ath12k_pci *ab_pci = ath12k_pci_priv(ab);
 
 	ath12k_pci_set_irq_affinity_hint(ab_pci, NULL);
-	ath12k_pci_power_down(ab, false);
+	ath12k_pci_hw_group_power_down(ab->ag);
 }
 
 static __maybe_unused int ath12k_pci_pm_suspend(struct device *dev)

-- 
2.34.1