mt76: mt7921: fix the insmod hangs

Fix the second insert module causing the device hangs after remove module.

Fixes: 1c099ab4 ("mt76: mt7921: add MCU support")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7921/init.c

@@ -273,8 +273,6 @@ void mt7921_unregister_device(struct mt7921_dev *dev)
 {
 	mt76_unregister_device(&dev->mt76);
 	mt7921_mcu_exit(dev);
-	mt7921_dma_cleanup(dev);
-
 	mt7921_tx_token_put(dev);
 
 	tasklet_disable(&dev->irq_tasklet);

drivers/net/wireless/mediatek/mt76/mt7921/mac.c

@@ -1207,8 +1207,7 @@ void mt7921_update_channel(struct mt76_dev *mdev)
 	mt76_connac_power_save_sched(&dev->mphy, &dev->pm);
 }
 
-static int
-mt7921_wfsys_reset(struct mt7921_dev *dev)
+int mt7921_wfsys_reset(struct mt7921_dev *dev)
 {
 	mt76_set(dev, 0x70002600, BIT(0));
 	msleep(200);

drivers/net/wireless/mediatek/mt76/mt7921/mcu.c

@@ -960,18 +960,7 @@ int mt7921_mcu_init(struct mt7921_dev *dev)
 
 void mt7921_mcu_exit(struct mt7921_dev *dev)
 {
-	u32 reg = mt7921_reg_map_l1(dev, MT_TOP_MISC);
-
-	__mt76_mcu_restart(&dev->mt76);
-	if (!mt76_poll_msec(dev, reg, MT_TOP_MISC_FW_STATE,
-			    FIELD_PREP(MT_TOP_MISC_FW_STATE,
-				       FW_STATE_FW_DOWNLOAD), 1000)) {
-		dev_err(dev->mt76.dev, "Failed to exit mcu\n");
-		return;
-	}
-
-	reg = mt7921_reg_map_l1(dev, MT_TOP_LPCR_HOST_BAND0);
-	mt76_wr(dev, reg, MT_TOP_LPCR_HOST_FW_OWN);
+	mt7921_wfsys_reset(dev);
 	skb_queue_purge(&dev->mt76.mcu.res_q);
 }
 

drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h

@@ -351,4 +351,5 @@ void mt7921_coredump_work(struct work_struct *work);
 int mt7921_mcu_update_arp_filter(struct ieee80211_hw *hw,
 				 struct ieee80211_vif *vif,
 				 struct ieee80211_bss_conf *info);
+int mt7921_wfsys_reset(struct mt7921_dev *dev);
 #endif