wifi: mt76: mt7915: enable .sta_set_txpwr support

This adds support for adjusting the Txpower level while pushing
traffic to an associated station. The allowed range is from 0 to
the maximum power of channel.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/init.c

@@ -355,6 +355,9 @@ mt7915_init_wiphy(struct ieee80211_hw *hw)
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_FILS_DISCOVERY);
 	wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_ACK_SIGNAL_SUPPORT);
 
+	if (!is_mt7915(&dev->mt76))
+		wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_STA_TX_PWR);
+
 	if (!mdev->dev->of_node ||
 	    !of_property_read_bool(mdev->dev->of_node,
 				   "mediatek,disable-radar-background"))

drivers/net/wireless/mediatek/mt76/mt7915/main.c

@@ -1134,6 +1134,39 @@ static void mt7915_sta_set_decap_offload(struct ieee80211_hw *hw,
 	mt76_connac_mcu_wtbl_update_hdr_trans(&dev->mt76, vif, sta);
 }
 
+static int mt7915_sta_set_txpwr(struct ieee80211_hw *hw,
+				struct ieee80211_vif *vif,
+				struct ieee80211_sta *sta)
+{
+	struct mt7915_phy *phy = mt7915_hw_phy(hw);
+	struct mt7915_dev *dev = mt7915_hw_dev(hw);
+	s16 txpower = sta->deflink.txpwr.power;
+	int ret;
+
+	if (sta->deflink.txpwr.type == NL80211_TX_POWER_AUTOMATIC)
+		txpower = 0;
+
+	mutex_lock(&dev->mt76.mutex);
+
+	/* NOTE: temporarily use 0 as minimum limit, which is a
+	 * global setting and will be applied to all stations.
+	 */
+	ret = mt7915_mcu_set_txpower_frame_min(phy, 0);
+	if (ret)
+		goto out;
+
+	/* This only applies to data frames while pushing traffic,
+	 * whereas the management frames or other packets that are
+	 * using fixed rate can be configured via TxD.
+	 */
+	ret = mt7915_mcu_set_txpower_frame(phy, vif, sta, txpower);
+
+out:
+	mutex_unlock(&dev->mt76.mutex);
+
+	return ret;
+}
+
 static const char mt7915_gstrings_stats[][ETH_GSTRING_LEN] = {
 	"tx_ampdu_cnt",
 	"tx_stop_q_empty_cnt",
@@ -1499,6 +1532,7 @@ const struct ieee80211_ops mt7915_ops = {
 	.set_bitrate_mask = mt7915_set_bitrate_mask,
 	.set_coverage_class = mt7915_set_coverage_class,
 	.sta_statistics = mt7915_sta_statistics,
+	.sta_set_txpwr = mt7915_sta_set_txpwr,
 	.sta_set_4addr = mt7915_sta_set_4addr,
 	.sta_set_decap_offload = mt7915_sta_set_decap_offload,
 	.add_twt_setup = mt7915_mac_add_twt_setup,

drivers/net/wireless/mediatek/mt76/mt7915/mcu.c

@@ -3105,6 +3105,88 @@ int mt7915_mcu_set_thermal_throttling(struct mt7915_phy *phy, u8 state)
 				 &req, sizeof(req), false);
 }
 
+int mt7915_mcu_set_txpower_frame_min(struct mt7915_phy *phy, s8 txpower)
+{
+	struct mt7915_dev *dev = phy->dev;
+	struct {
+		u8 format_id;
+		u8 rsv;
+		u8 band_idx;
+		s8 txpower_min;
+	} __packed req = {
+		.format_id = TX_POWER_LIMIT_FRAME_MIN,
+		.band_idx = phy->band_idx,
+		.txpower_min = txpower * 2, /* 0.5db */
+	};
+
+	return mt76_mcu_send_msg(&dev->mt76,
+				 MCU_EXT_CMD(TX_POWER_FEATURE_CTRL), &req,
+				 sizeof(req), true);
+}
+
+int mt7915_mcu_set_txpower_frame(struct mt7915_phy *phy,
+				 struct ieee80211_vif *vif,
+				 struct ieee80211_sta *sta, s8 txpower)
+{
+	struct mt7915_sta *msta = (struct mt7915_sta *)sta->drv_priv;
+	struct mt7915_dev *dev = phy->dev;
+	struct mt76_phy *mphy = phy->mt76;
+	struct {
+		u8 format_id;
+		u8 rsv[3];
+		u8 band_idx;
+		s8 txpower_max;
+		__le16 wcid;
+		s8 txpower_offs[48];
+	} __packed req = {
+		.format_id = TX_POWER_LIMIT_FRAME,
+		.band_idx = phy->band_idx,
+		.txpower_max = DIV_ROUND_UP(mphy->txpower_cur, 2),
+		.wcid = cpu_to_le16(msta->wcid.idx),
+	};
+	int ret, n_chains = hweight8(mphy->antenna_mask);
+	s8 txpower_sku[MT7915_SKU_RATE_NUM];
+
+	ret = mt7915_mcu_get_txpower_sku(phy, txpower_sku, sizeof(txpower_sku));
+	if (ret)
+		return ret;
+
+	txpower = txpower * 2 - mt76_tx_power_nss_delta(n_chains);
+	if (txpower > mphy->txpower_cur || txpower < 0)
+		return -EINVAL;
+
+	if (txpower) {
+		u32 offs, len, i;
+
+		if (sta->deflink.ht_cap.ht_supported) {
+			const u8 *sku_len = mt7915_sku_group_len;
+
+			offs = sku_len[SKU_CCK] + sku_len[SKU_OFDM];
+			len = sku_len[SKU_HT_BW20] + sku_len[SKU_HT_BW40];
+
+			if (sta->deflink.vht_cap.vht_supported) {
+				offs += len;
+				len = sku_len[SKU_VHT_BW20] * 4;
+
+				if (sta->deflink.he_cap.has_he) {
+					offs += len + sku_len[SKU_HE_RU26] * 3;
+					len = sku_len[SKU_HE_RU242] * 4;
+				}
+			}
+		} else {
+			return -EINVAL;
+		}
+
+		for (i = 0; i < len; i++, offs++)
+			req.txpower_offs[i] =
+				DIV_ROUND_UP(txpower - txpower_sku[offs], 2);
+	}
+
+	return mt76_mcu_send_msg(&dev->mt76,
+				 MCU_EXT_CMD(TX_POWER_FEATURE_CTRL), &req,
+				 sizeof(req), true);
+}
+
 int mt7915_mcu_set_txpower_sku(struct mt7915_phy *phy)
 {
 	struct mt7915_dev *dev = phy->dev;
@@ -3116,7 +3198,7 @@ int mt7915_mcu_set_txpower_sku(struct mt7915_phy *phy)
 		u8 dbdc_idx;
 		s8 val[MT7915_SKU_RATE_NUM];
 	} __packed req = {
-		.format_id = 4,
+		.format_id = TX_POWER_LIMIT_TABLE,
 		.dbdc_idx = phy != &dev->phy,
 	};
 	struct mt76_power_limits limits_array;
@@ -3166,11 +3248,11 @@ int mt7915_mcu_get_txpower_sku(struct mt7915_phy *phy, s8 *txpower, int len)
 		u8 band;
 		u8 _rsv;
 	} __packed req = {
-		.format_id = 7,
+		.format_id = TX_POWER_LIMIT_INFO,
 		.category = RATE_POWER_INFO,
 		.band = phy != &dev->phy,
 	};
-	s8 res[MT7915_SKU_RATE_NUM][2];
+	s8 txpower_sku[MT7915_SKU_RATE_NUM][2];
 	struct sk_buff *skb;
 	int ret, i;
 
@@ -3180,9 +3262,9 @@ int mt7915_mcu_get_txpower_sku(struct mt7915_phy *phy, s8 *txpower, int len)
 	if (ret)
 		return ret;
 
-	memcpy(res, skb->data + 4, sizeof(res));
+	memcpy(txpower_sku, skb->data + 4, sizeof(txpower_sku));
 	for (i = 0; i < len; i++)
-		txpower[i] = res[i][req.band];
+		txpower[i] = txpower_sku[i][req.band_idx];
 
 	dev_kfree_skb(skb);
 
@@ -3220,7 +3302,7 @@ int mt7915_mcu_set_sku_en(struct mt7915_phy *phy, bool enable)
 		u8 dbdc_idx;
 		u8 rsv;
 	} __packed req = {
-		.format_id = 0,
+		.format_id = TX_POWER_LIMIT_ENABLE,
 		.dbdc_idx = phy != &dev->phy,
 		.sku_enable = enable,
 	};

drivers/net/wireless/mediatek/mt76/mt7915/mcu.h

@@ -419,6 +419,14 @@ enum {
 #define RATE_CFG_PHY_TYPE		GENMASK(27, 24)
 #define RATE_CFG_HE_LTF			GENMASK(31, 28)
 
+enum {
+	TX_POWER_LIMIT_ENABLE,
+	TX_POWER_LIMIT_TABLE = 0x4,
+	TX_POWER_LIMIT_INFO = 0x7,
+	TX_POWER_LIMIT_FRAME = 0x11,
+	TX_POWER_LIMIT_FRAME_MIN = 0x12,
+};
+
 enum {
 	SPR_ENABLE = 0x1,
 	SPR_ENABLE_SD = 0x3,

drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h

@@ -528,6 +528,10 @@ int mt7915_mcu_set_ser(struct mt7915_dev *dev, u8 action, u8 set, u8 band);
 int mt7915_mcu_set_sku_en(struct mt7915_phy *phy, bool enable);
 int mt7915_mcu_set_txpower_sku(struct mt7915_phy *phy);
 int mt7915_mcu_get_txpower_sku(struct mt7915_phy *phy, s8 *txpower, int len);
+int mt7915_mcu_set_txpower_frame_min(struct mt7915_phy *phy, s8 txpower);
+int mt7915_mcu_set_txpower_frame(struct mt7915_phy *phy,
+				 struct ieee80211_vif *vif,
+				 struct ieee80211_sta *sta, s8 txpower);
 int mt7915_mcu_set_txbf(struct mt7915_dev *dev, u8 action);
 int mt7915_mcu_set_fcc5_lpn(struct mt7915_dev *dev, int val);
 int mt7915_mcu_set_pulse_th(struct mt7915_dev *dev,