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wifi: mt76: mt7921: fix returned txpower

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This bug was noticed by me and confirmed by many more people using this
chipset with openwrt: https://github.com/openwrt/mt76/issues/783

It seems that for this particular chipset the mt76_phy->txpower_cur is
never set, like in the case of other chipsets like mt7603, mt7615, etc.

The driver is correctly calculating the TX power adjustment based on the
number of antennas. However, the base TX power (phy->txpower_cur) is not
being properly initialized or set to a meaningful value. It's starting
at 0, so the final result is just the antenna gain compensation divided
by 2.

Signed-off-by: Razvan Grigore <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Razvan Grigore
2025-03-10 13:24:28 +01:00
committed by Felix Fietkau
parent f118073642
commit ffd1cbfc48
1 changed files with 7 additions and 0 deletions
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mt7921/main.c
+7
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@@ -1254,7 +1254,9 @@ static void mt7921_ipv6_addr_change(struct ieee80211_hw *hw,
int mt7921_set_tx_sar_pwr(struct ieee80211_hw *hw, int mt7921_set_tx_sar_pwr(struct ieee80211_hw *hw,
const struct cfg80211_sar_specs *sar) const struct cfg80211_sar_specs *sar)
{ {
struct mt76_power_limits limits_array;
struct mt76_phy *mphy = hw->priv; struct mt76_phy *mphy = hw->priv;
int tx_power;
if (sar) { if (sar) {
int err = mt76_init_sar_power(hw, sar); int err = mt76_init_sar_power(hw, sar);
@@ -1264,6 +1266,11 @@ int mt7921_set_tx_sar_pwr(struct ieee80211_hw *hw,
} }
mt792x_init_acpi_sar_power(mt792x_hw_phy(hw), !sar); mt792x_init_acpi_sar_power(mt792x_hw_phy(hw), !sar);
tx_power = mt76_get_power_bound(mphy, hw->conf.power_level);
tx_power = mt76_get_rate_power_limits(mphy, mphy->chandef.chan,
&limits_array, tx_power);
mphy->txpower_cur = tx_power;
return mt76_connac_mcu_set_rate_txpower(mphy); return mt76_connac_mcu_set_rate_txpower(mphy);
} }