wifi: mt76: mt7925: fix the unfinished command of regd_notifier before suspend

Before entering suspend, we need to ensure that all MCU command are
completed. In some cases, such as with regd_notifier, there is a
chance that CLC commands, will be executed before suspend.

Signed-off-by: Quan Zhou <quan.zhou@mediatek.com>
Link: https://patch.msgid.link/3af7b4e5bf7437832b016e32743657d1d55b1f9d.1735910288.git.quan.zhou@mediatek.com
Signed-off-by: Felix Fietkau <nbd@nbd.name>

Author: Quanzhoucen

drivers/net/wireless/mediatek/mt76/mt7925/init.c

@@ -79,11 +79,14 @@ mt7925_regd_notifier(struct wiphy *wiphy,
 	mdev->region = req->dfs_region;
 	dev->country_ie_env = req->country_ie_env;
 
+	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);
 	mt792x_mutex_release(dev);
+	dev->regd_in_progress = false;
+	wake_up(&dev->wait);
 }
 
 static void mt7925_mac_init_basic_rates(struct mt792x_dev *dev)
@@ -226,6 +229,7 @@ int mt7925_register_device(struct mt792x_dev *dev)
 	spin_lock_init(&dev->pm.wake.lock);
 	mutex_init(&dev->pm.mutex);
 	init_waitqueue_head(&dev->pm.wait);
+	init_waitqueue_head(&dev->wait);
 	spin_lock_init(&dev->pm.txq_lock);
 	INIT_DELAYED_WORK(&dev->mphy.mac_work, mt792x_mac_work);
 	INIT_DELAYED_WORK(&dev->phy.scan_work, mt7925_scan_work);

drivers/net/wireless/mediatek/mt76/mt7925/pci.c

@@ -455,6 +455,9 @@ static int mt7925_pci_suspend(struct device *device)
 	if (err < 0)
 		goto restore_suspend;
 
+	wait_event_timeout(dev->wait,
+			   !dev->regd_in_progress, 5 * HZ);
+
 	/* always enable deep sleep during suspend to reduce
 	 * power consumption
 	 */