[PATCH 1/4] wifi: mt76: mt7996: fix chainmask calculation in mt7996_set_antenna()

[Shayne Chen]

Fix per-band chainmask when restoring from the dev chainmask.

Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Signed-off-by: Shayne Chen <shayne.chen at mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7996/main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/main.c b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
index 4421cd54311b..c423b052e4f4 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
@@ -880,7 +880,10 @@ mt7996_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
 	phy->mt76->antenna_mask = tx_ant;
 
 	/* restore to the origin chainmask which might have auxiliary path */
-	if (hweight8(tx_ant) == max_nss)
+	if (hweight8(tx_ant) == max_nss && band_idx < MT_BAND2)
+		phy->mt76->chainmask = ((dev->chainmask >> shift) &
+					(BIT(dev->chainshift[band_idx + 1] - shift) - 1)) << shift;
+	else if (hweight8(tx_ant) == max_nss)
 		phy->mt76->chainmask = (dev->chainmask >> shift) << shift;
 	else
 		phy->mt76->chainmask = tx_ant << shift;
-- 
2.25.1