wifi: mt76: mt7996: add txpower setting support

Add support for setting txpower from upper layer and configuring per-rate
txpower limit table.
Co-developed-by: Allen Ye <allen.ye@mediatek.com>
Signed-off-by: Allen Ye <allen.ye@mediatek.com>
Co-developed-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

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

@@ -396,6 +396,13 @@ static int mt7996_config(struct ieee80211_hw *hw, u32 changed)
 		ieee80211_wake_queues(hw);
 	}
 
+	if (changed & (IEEE80211_CONF_CHANGE_POWER |
+		       IEEE80211_CONF_CHANGE_CHANNEL)) {
+		ret = mt7996_mcu_set_txpower_sku(phy);
+		if (ret)
+			return ret;
+	}
+
 	mutex_lock(&dev->mt76.mutex);
 
 	if (changed & IEEE80211_CONF_CHANGE_MONITOR) {
@@ -965,6 +972,7 @@ mt7996_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
 	mt76_set_stream_caps(phy->mt76, true);
 	mt7996_set_stream_vht_txbf_caps(phy);
 	mt7996_set_stream_he_eht_caps(phy);
+	mt7996_mcu_set_txpower_sku(phy);
 
 	mutex_unlock(&dev->mt76.mutex);
 

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

@@ -4353,3 +4353,61 @@ int mt7996_mcu_wed_rro_reset_sessions(struct mt7996_dev *dev, u16 id)
 	return mt76_mcu_send_msg(&dev->mt76, MCU_WM_UNI_CMD(RRO), &req,
 				 sizeof(req), true);
 }
+
+int mt7996_mcu_set_txpower_sku(struct mt7996_phy *phy)
+{
+#define TX_POWER_LIMIT_TABLE_RATE	0
+	struct mt7996_dev *dev = phy->dev;
+	struct mt76_phy *mphy = phy->mt76;
+	struct ieee80211_hw *hw = mphy->hw;
+	struct tx_power_limit_table_ctrl {
+		u8 __rsv1[4];
+
+		__le16 tag;
+		__le16 len;
+		u8 power_ctrl_id;
+		u8 power_limit_type;
+		u8 band_idx;
+	} __packed req = {
+		.tag = cpu_to_le16(UNI_TXPOWER_POWER_LIMIT_TABLE_CTRL),
+		.len = cpu_to_le16(sizeof(req) + MT7996_SKU_RATE_NUM - 4),
+		.power_ctrl_id = UNI_TXPOWER_POWER_LIMIT_TABLE_CTRL,
+		.power_limit_type = TX_POWER_LIMIT_TABLE_RATE,
+		.band_idx = phy->mt76->band_idx,
+	};
+	struct mt76_power_limits la = {};
+	struct sk_buff *skb;
+	int i, tx_power;
+
+	tx_power = mt7996_get_power_bound(phy, hw->conf.power_level);
+	tx_power = mt76_get_rate_power_limits(mphy, mphy->chandef.chan,
+					      &la, tx_power);
+	mphy->txpower_cur = tx_power;
+
+	skb = mt76_mcu_msg_alloc(&dev->mt76, NULL,
+				 sizeof(req) + MT7996_SKU_RATE_NUM);
+	if (!skb)
+		return -ENOMEM;
+
+	skb_put_data(skb, &req, sizeof(req));
+	/* cck and ofdm */
+	skb_put_data(skb, &la.cck, sizeof(la.cck) + sizeof(la.ofdm));
+	/* ht20 */
+	skb_put_data(skb, &la.mcs[0], 8);
+	/* ht40 */
+	skb_put_data(skb, &la.mcs[1], 9);
+
+	/* vht */
+	for (i = 0; i < 4; i++) {
+		skb_put_data(skb, &la.mcs[i], sizeof(la.mcs[i]));
+		skb_put_zero(skb, 2);  /* padding */
+	}
+
+	/* he */
+	skb_put_data(skb, &la.ru[0], sizeof(la.ru));
+	/* eht */
+	skb_put_data(skb, &la.eht[0], sizeof(la.eht));
+
+	return mt76_mcu_skb_send_msg(&dev->mt76, skb,
+				     MCU_WM_UNI_CMD(TXPOWER), true);
+}

drivers/net/wireless/mediatek/mt76/mt7996/mcu.h

@@ -762,6 +762,18 @@ enum {
 #define MT7996_MAX_BSS_OFFLOAD_SIZE	(MT7996_MAX_BEACON_SIZE +		\
 					 MT7996_BEACON_UPDATE_SIZE)
 
+static inline s8
+mt7996_get_power_bound(struct mt7996_phy *phy, s8 txpower)
+{
+	struct mt76_phy *mphy = phy->mt76;
+	int n_chains = hweight16(mphy->chainmask);
+
+	txpower = mt76_get_sar_power(mphy, mphy->chandef.chan, txpower * 2);
+	txpower -= mt76_tx_power_nss_delta(n_chains);
+
+	return txpower;
+}
+
 enum {
 	UNI_BAND_CONFIG_RADIO_ENABLE,
 	UNI_BAND_CONFIG_RTS_THRESHOLD = 0x08,
@@ -830,6 +842,10 @@ enum {
 	UNI_CMD_THERMAL_PROTECT_DUTY_CONFIG,
 };
 
+enum {
+	UNI_TXPOWER_POWER_LIMIT_TABLE_CTRL = 4,
+};
+
 enum {
 	UNI_CMD_ACCESS_REG_BASIC = 0x0,
 	UNI_CMD_ACCESS_RF_REG_BASIC,

drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h

@@ -42,6 +42,8 @@
 #define MT7996_CFEND_RATE_DEFAULT	0x49	/* OFDM 24M */
 #define MT7996_CFEND_RATE_11B		0x03	/* 11B LP, 11M */
 
+#define MT7996_SKU_RATE_NUM		417
+
 #define MT7996_MAX_TWT_AGRT		16
 #define MT7996_MAX_STA_TWT_AGRT		8
 #define MT7996_MAX_QUEUE		(__MT_RXQ_MAX +	__MT_MCUQ_MAX + 3)
@@ -471,6 +473,7 @@ int mt7996_mcu_get_chan_mib_info(struct mt7996_phy *phy, bool chan_switch);
 int mt7996_mcu_get_temperature(struct mt7996_phy *phy);
 int mt7996_mcu_set_thermal_throttling(struct mt7996_phy *phy, u8 state);
 int mt7996_mcu_set_thermal_protect(struct mt7996_phy *phy, bool enable);
+int mt7996_mcu_set_txpower_sku(struct mt7996_phy *phy);
 int mt7996_mcu_rdd_cmd(struct mt7996_dev *dev, int cmd, u8 index,
 		       u8 rx_sel, u8 val);
 int mt7996_mcu_rdd_background_enable(struct mt7996_phy *phy,