mt76: mt7615: introduce SAR support

Add SAR spec support to mt7615 driver to allow configuring SAR power
limitations on the frequency ranges from the userland.
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7615/main.c

@@ -431,6 +431,29 @@ static int mt7615_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 	return err;
 }
 
+static int mt7615_set_sar_specs(struct ieee80211_hw *hw,
+				const struct cfg80211_sar_specs *sar)
+{
+	struct mt7615_phy *phy = mt7615_hw_phy(hw);
+	int err;
+
+	if (!cfg80211_chandef_valid(&phy->mt76->chandef))
+		return -EINVAL;
+
+	err = mt76_init_sar_power(hw, sar);
+	if (err)
+		return err;
+
+	if (mt7615_firmware_offload(phy->dev))
+		return mt76_connac_mcu_set_rate_txpower(phy->mt76);
+
+	ieee80211_stop_queues(hw);
+	err = mt7615_set_channel(phy);
+	ieee80211_wake_queues(hw);
+
+	return err;
+}
+
 static int mt7615_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct mt7615_dev *dev = mt7615_hw_dev(hw);
@@ -1333,6 +1356,7 @@ const struct ieee80211_ops mt7615_ops = {
 	.set_wakeup = mt7615_set_wakeup,
 	.set_rekey_data = mt7615_set_rekey_data,
 #endif /* CONFIG_PM */
+	.set_sar_specs = mt7615_set_sar_specs,
 };
 EXPORT_SYMBOL_GPL(mt7615_ops);
 

drivers/net/wireless/mediatek/mt76/mt7615/mcu.c

@@ -2020,7 +2020,7 @@ static void mt7615_mcu_set_txpower_sku(struct mt7615_phy *phy, u8 *sku)
 	struct mt76_power_limits limits;
 	s8 *limits_array = (s8 *)&limits;
 	int n_chains = hweight8(mphy->antenna_mask);
-	int tx_power;
+	int tx_power = hw->conf.power_level * 2;
 	int i;
 	static const u8 sku_mapping[] = {
 #define SKU_FIELD(_type, _field) \
@@ -2077,9 +2077,8 @@ static void mt7615_mcu_set_txpower_sku(struct mt7615_phy *phy, u8 *sku)
 #undef SKU_FIELD
 	};
 
-	tx_power = hw->conf.power_level * 2 -
-		   mt76_tx_power_nss_delta(n_chains);
-
+	tx_power = mt76_get_sar_power(mphy, mphy->chandef.chan, tx_power);
+	tx_power -= mt76_tx_power_nss_delta(n_chains);
 	tx_power = mt76_get_rate_power_limits(mphy, mphy->chandef.chan,
 					      &limits, tx_power);
 	mphy->txpower_cur = tx_power;