Using both chains adds max. 3 dBm. A similar worst-case calculation is being used in ath9k as well to ensure that the hardware stays within regulatory limits
Signed-off-by: Felix Fietkau <[email protected]> --- drivers/net/wireless/mediatek/mt76/mt76x2_init.c | 3 +++ drivers/net/wireless/mediatek/mt76/mt76x2_main.c | 7 +++++++ 2 files changed, 10 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2_init.c b/drivers/net/wireless/mediatek/mt76/mt76x2_init.c index 0755b451829e..3e3a01b6f2ce 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x2_init.c +++ b/drivers/net/wireless/mediatek/mt76/mt76x2_init.c @@ -785,6 +785,9 @@ mt76x2_init_txpower(struct mt76x2_dev *dev, chan->max_power = mt76x2_get_max_rate_power(&t) + target_power; chan->max_power /= 2; + + /* convert to combined output power on 2x2 devices */ + chan->max_power += 3; } } diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2_main.c b/drivers/net/wireless/mediatek/mt76/mt76x2_main.c index 02dd2cafa52f..8098a2b82c5b 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x2_main.c +++ b/drivers/net/wireless/mediatek/mt76/mt76x2_main.c @@ -155,6 +155,9 @@ mt76x2_config(struct ieee80211_hw *hw, u32 changed) if (changed & IEEE80211_CONF_CHANGE_POWER) { dev->txpower_conf = hw->conf.power_level * 2; + /* convert to per-chain power for 2x2 devices */ + dev->txpower_conf -= 6; + if (test_bit(MT76_STATE_RUNNING, &dev->mt76.state)) { mt76x2_phy_set_txpower(dev); mt76x2_tx_set_txpwr_auto(dev, dev->txpower_conf); @@ -443,6 +446,10 @@ mt76x2_get_txpower(struct ieee80211_hw *hw, struct ieee80211_vif *vif, int *dbm) struct mt76x2_dev *dev = hw->priv; *dbm = dev->txpower_cur / 2; + + /* convert from per-chain power to combined output on 2x2 devices */ + *dbm += 3; + return 0; } -- 2.14.2
