wifi: mt76: connac: add new definition of tx descriptor

Add MT_TXD6_MSDU_CNT_V2 bitfield, which is used by mt7992 chipsets.
This is a preliminary patch for mt7992 chipsets support.
Signed-off-by: Benjamin Lin <benjamin-jw.lin@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76_connac3_mac.h

@@ -245,6 +245,7 @@ enum tx_mgnt_type {
 #define MT_TXD6_TIMESTAMP_OFS_EN	BIT(15)
 #define MT_TXD6_TIMESTAMP_OFS_IDX	GENMASK(14, 10)
 #define MT_TXD6_MSDU_CNT		GENMASK(9, 4)
+#define MT_TXD6_MSDU_CNT_V2		GENMASK(15, 10)
 #define MT_TXD6_DIS_MAT			BIT(3)
 #define MT_TXD6_DAS			BIT(2)
 #define MT_TXD6_AMSDU_CAP		BIT(1)

drivers/net/wireless/mediatek/mt76/mt7996/mac.c

@@ -873,8 +873,11 @@ void mt7996_mac_write_txwi(struct mt7996_dev *dev, __le32 *txwi,
 		val |= MT_TXD5_TX_STATUS_HOST;
 	txwi[5] = cpu_to_le32(val);
 
-	val = MT_TXD6_DIS_MAT | MT_TXD6_DAS |
-	      FIELD_PREP(MT_TXD6_MSDU_CNT, 1);
+	val = MT_TXD6_DIS_MAT | MT_TXD6_DAS;
+	if (is_mt7996(&dev->mt76))
+		val |= FIELD_PREP(MT_TXD6_MSDU_CNT, 1);
+	else
+		val |= FIELD_PREP(MT_TXD6_MSDU_CNT_V2, 1);
 	txwi[6] = cpu_to_le32(val);
 	txwi[7] = 0;