[PATCH 1/4] wifi: mt76: add mt76_get_power_bound helper function

[Razvan Grigore <razvan.grigore@vampirebyte.ro>]

This will replace mt7915_get_power_bound function from b/mt7915/mcu.h, since we will need it also for mt7921 and mt7925

Signed-off-by: Razvan Grigore <razvan.grigore@vampirebyte.ro>
---
 drivers/net/wireless/mediatek/mt76/mac80211.c | 11 +++++++++++
 drivers/net/wireless/mediatek/mt76/mt76.h     |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c
index 508b472408c2..2c98cc42cd7e 100644
--- a/drivers/net/wireless/mediatek/mt76/mac80211.c
+++ b/drivers/net/wireless/mediatek/mt76/mac80211.c
@@ -1697,6 +1697,17 @@ void mt76_wcid_add_poll(struct mt76_dev *dev, struct mt76_wcid *wcid)
 }
 EXPORT_SYMBOL_GPL(mt76_wcid_add_poll);
 
+s8 mt76_get_power_bound(struct mt76_phy *phy, s8 txpower)
+{
+	int n_chains = hweight16(phy->chainmask);
+
+	txpower = mt76_get_sar_power(phy, phy->chandef.chan, txpower * 2);
+	txpower -= mt76_tx_power_nss_delta(n_chains);
+
+	return txpower;
+}
+EXPORT_SYMBOL_GPL(mt76_get_power_bound);
+
 int mt76_get_txpower(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 		     unsigned int link_id, int *dbm)
 {
diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h
index 132148f7b107..96f98a0d55a8 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -1482,6 +1482,8 @@ void mt76_sta_pre_rcu_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 
 int mt76_get_min_avg_rssi(struct mt76_dev *dev, u8 phy_idx);
 
+s8 mt76_get_power_bound(struct mt76_phy *phy, s8 txpower);
+
 int mt76_get_txpower(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 		     unsigned int link_id, int *dbm);
 int mt76_init_sar_power(struct ieee80211_hw *hw,
-- 
2.34.1