[PATCH 5/5] wifi: mt76: mt7603: disable A-MSDU tx support on MT7628

[Felix Fietkau <nbd@nbd.name>]

It was reported that this can cause the PSE hang issues, even with a low
number of fragments.

Link: https://github.com/openwrt/mt76/issues/793#issuecomment-1676529138
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 drivers/net/wireless/mediatek/mt76/mac80211.c    | 3 ++-
 drivers/net/wireless/mediatek/mt76/mt7603/init.c | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c
index c0ff36a98bed..481c55fe9a66 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -453,7 +453,8 @@ mt76_phy_init(struct mt76_phy *phy, struct ieee80211_hw *hw)
 	ieee80211_hw_set(hw, SUPPORTS_AMSDU_IN_AMPDU);
 	ieee80211_hw_set(hw, SUPPORTS_REORDERING_BUFFER);
 
-	if (!(dev->drv->drv_flags & MT_DRV_AMSDU_OFFLOAD)) {
+	if (!(dev->drv->drv_flags & MT_DRV_AMSDU_OFFLOAD) &&
+	    hw->max_tx_fragments > 1) {
 		ieee80211_hw_set(hw, TX_AMSDU);
 		ieee80211_hw_set(hw, TX_FRAG_LIST);
 	}
diff --git a/drivers/net/wireless/mediatek/mt76/mt7603/init.c b/drivers/net/wireless/mediatek/mt76/mt7603/init.c
index dd3c96f96999..6c55c72f28a2 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7603/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7603/init.c
@@ -524,6 +524,7 @@ int mt7603_register_device(struct mt7603_dev *dev)
 	hw->max_rates = 3;
 	hw->max_report_rates = 7;
 	hw->max_rate_tries = 11;
+	hw->max_tx_fragments = 1;
 
 	hw->radiotap_timestamp.units_pos =
 		IEEE80211_RADIOTAP_TIMESTAMP_UNIT_US;
-- 
2.41.0