mt76: mt7921: fix mgmt frame using unexpected bitrate

Fix the current driver mgmt frame is not respecting the basic rates field
provided by the AP and then unconditionally is using the lowest (1 or 6
Mbps) rate.

For example, if the AP only supported basic rate {24, 36, 48, 54} Mbps,
mt7921 cannot send mgmt frame with the rate not in the group. So,
instead, we pick up the lowest basic rate the AP can support to send.

Fixes: 163f4d22 ("mt76: mt7921: add MAC support")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -811,15 +811,15 @@ void mt7921_mac_write_txwi(struct mt7921_dev *dev, __le32 *txwi,
 		mt7921_mac_write_txwi_80211(dev, txwi, skb, key);
 
 	if (txwi[2] & cpu_to_le32(MT_TXD2_FIX_RATE)) {
-		u16 rate;
+		u16 rate, mode;
 
 		/* hardware won't add HTC for mgmt/ctrl frame */
 		txwi[2] |= cpu_to_le32(MT_TXD2_HTC_VLD);
 
-		if (mphy->chandef.chan->band == NL80211_BAND_5GHZ)
-			rate = MT7921_5G_RATE_DEFAULT;
-		else
-			rate = MT7921_2G_RATE_DEFAULT;
+		rate = mt76_default_basic_rate(mphy, vif);
+		mode = rate >> 8;
+		rate &= GENMASK(7, 0);
+		rate |= FIELD_PREP(MT_TX_RATE_MODE, mode);
 
 		val = MT_TXD6_FIXED_BW |
 		      FIELD_PREP(MT_TXD6_TX_RATE, rate);

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

@@ -38,8 +38,6 @@
 
 #define MT7921_CFEND_RATE_DEFAULT	0x49	/* OFDM 24M */
 #define MT7921_CFEND_RATE_11B		0x03	/* 11B LP, 11M */
-#define MT7921_5G_RATE_DEFAULT		0x4b	/* OFDM 6M */
-#define MT7921_2G_RATE_DEFAULT		0x0	/* CCK 1M */
 
 #define MT7921_SKU_RATE_NUM		161
 #define MT7921_SKU_MAX_DELTA_IDX	MT7921_SKU_RATE_NUM