linux-kernel - [PATCH 6.12 2/3] wifi: mt76: mt7925: fix CLC command timeout when suspend/resume

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Message-ID: <95428f78ab30c93a150999e430f07e7047d95adb.1767611788.git.jan.kiszka@siemens.com>
Date: Mon,  5 Jan 2026 12:16:27 +0100
From: Jan Kiszka <jan.kiszka@...mens.com>
To: stable@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felix Fietkau <nbd@....name>,
	Quan Zhou <quan.zhou@...iatek.com>
Cc: Sasha Levin <sashal@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: [PATCH 6.12 2/3] wifi: mt76: mt7925: fix CLC command timeout when suspend/resume

From: Quan Zhou <quan.zhou@...iatek.com>

[ Upstream commit a0f721b8d986b62b4de316444f2b2e356d17e3b5 ]

When enter suspend/resume while in a connected state, the upper layer
will trigger disconnection before entering suspend, and at the same time,
it will trigger regd_notifier() and update CLC, causing the CLC event to
not be received due to suspend, resulting in a command timeout.

Therefore, the update of CLC is postponed until resume, to ensure data
consistency and avoid the occurrence of command timeout.

Signed-off-by: Quan Zhou <quan.zhou@...iatek.com>
Link: https://patch.msgid.link/bab00a2805d0533fd8beaa059222659858a9dcb5.1735910455.git.quan.zhou@mediatek.com
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
---
 .../net/wireless/mediatek/mt76/mt7925/init.c  | 20 ++++++++++++++++---
 .../wireless/mediatek/mt76/mt7925/mt7925.h    |  1 +
 .../net/wireless/mediatek/mt76/mt7925/pci.c   |  3 +++
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/init.c b/drivers/net/wireless/mediatek/mt76/mt7925/init.c
index 3f48ae80aed4..105ba5d0934c 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/init.c
@@ -59,6 +59,18 @@ static int mt7925_thermal_init(struct mt792x_phy *phy)
 						       mt7925_hwmon_groups);
 	return PTR_ERR_OR_ZERO(hwmon);
 }
+
+void mt7925_regd_update(struct mt792x_dev *dev)
+{
+	struct mt76_dev *mdev = &dev->mt76;
+	struct ieee80211_hw *hw = mdev->hw;
+
+	mt7925_mcu_set_clc(dev, mdev->alpha2, dev->country_ie_env);
+	mt7925_mcu_set_channel_domain(hw->priv);
+	mt7925_set_tx_sar_pwr(hw, NULL);
+}
+EXPORT_SYMBOL_GPL(mt7925_regd_update);
+
 static void
 mt7925_regd_notifier(struct wiphy *wiphy,
 		     struct regulatory_request *req)
@@ -66,6 +78,7 @@ mt7925_regd_notifier(struct wiphy *wiphy,
 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 	struct mt792x_dev *dev = mt792x_hw_dev(hw);
 	struct mt76_dev *mdev = &dev->mt76;
+	struct mt76_connac_pm *pm = &dev->pm;
 
 	/* allow world regdom at the first boot only */
 	if (!memcmp(req->alpha2, "00", 2) &&
@@ -81,11 +94,12 @@ mt7925_regd_notifier(struct wiphy *wiphy,
 	mdev->region = req->dfs_region;
 	dev->country_ie_env = req->country_ie_env;
 
+	if (pm->suspended)
+		return;
+
 	dev->regd_in_progress = true;
 	mt792x_mutex_acquire(dev);
-	mt7925_mcu_set_clc(dev, req->alpha2, req->country_ie_env);
-	mt7925_mcu_set_channel_domain(hw->priv);
-	mt7925_set_tx_sar_pwr(hw, NULL);
+	mt7925_regd_update(dev);
 	mt792x_mutex_release(dev);
 	dev->regd_in_progress = false;
 	wake_up(&dev->wait);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h b/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
index c83b8a210498..76f31abe9146 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
@@ -218,6 +218,7 @@ int mt7925_mcu_chip_config(struct mt792x_dev *dev, const char *cmd);
 int mt7925_mcu_set_rxfilter(struct mt792x_dev *dev, u32 fif,
 			    u8 bit_op, u32 bit_map);
 
+void mt7925_regd_update(struct mt792x_dev *dev);
 int mt7925_mac_init(struct mt792x_dev *dev);
 int mt7925_mac_sta_add(struct mt76_dev *mdev, struct ieee80211_vif *vif,
 		       struct ieee80211_sta *sta);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
index b4cc5607e0d6..ccb663bd9f52 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
@@ -554,11 +554,14 @@ static int mt7925_pci_resume(struct device *device)
 	local_bh_enable();
 
 	err = mt76_connac_mcu_set_hif_suspend(mdev, false);
+	if (err < 0)
+		goto failed;
 
 	/* restore previous ds setting */
 	if (!pm->ds_enable)
 		mt7925_mcu_set_deep_sleep(dev, false);
 
+	mt7925_regd_update(dev);
 failed:
 	pm->suspended = false;
 
-- 
2.51.0