[PATCH v3 3/4] mt76: mt7921: fix mgmt frame using unexpected bitrate

[sean.wang at mediatek.com]

From: Sean Wang <sean.wang at mediatek.com>

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: 163f4d22c118 ("mt76: mt7921: add MAC support")
Signed-off-by: Sean Wang <sean.wang at mediatek.com>
---
v2:  1. introduce another patch ("mt76: fix mt76_rates for the multiple devices")
	for those devices which have the same issue.
     2. drop the own mt7921_rates, the unused macro and variable.
v3:  1. introduce and rely on another patch
	("mt76: add mt76_default_basic_rate more devices can rely on").
     2. add Fixes tag.
---
 drivers/net/wireless/mediatek/mt76/mt7921/mac.c    | 5 +----
 drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h | 2 --
 2 files changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
index 7fe2e3a50428..a4ce362286eb 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/mac.c
@@ -815,10 +815,7 @@ void mt7921_mac_write_txwi(struct mt7921_dev *dev, __le32 *txwi,
 		/* 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);
 
 		val = MT_TXD6_FIXED_BW |
 		      FIELD_PREP(MT_TXD6_TX_RATE, rate);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h b/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
index 2d8bd6bfc820..be16d528a923 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/mt7921.h
+++ b/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
-- 
2.25.1