[PATCH 1/2] mt76: connac: fix txpower_cur not updated in mt76_connac_mcu_set_rate_txpower()

[bryam vargas]

>From 6c75ad481f0c3667d6ae2a2c8f7c2df08b1d52b5 Mon Sep 17 00:00:00 2001
From: bryam <bryamestebanvargas at gmail.com>
Date: Mon, 9 Mar 2026 11:52:53 -0500
Subject: [PATCH v2 1/2] mt76: mt7921: add mt7921-specific get_txpower callback

Instead of updating txpower_cur in the write path
(mt76_connac_mcu_set_rate_txpower), implement a mt7921-specific
.get_txpower callback that derives the reported TX power directly
from the SKU limits at query time.

This avoids mixing write-side configuration with reporting logic.
The callback uses mt76_get_power_bound() for SAR constraints and
chain delta, then mt76_get_rate_power_limits() for per-rate EEPROM
limits, yielding the actual TX power value.

Fixes: 3b4a3bdba808 ("mt76: mt7921: add support for reporting tx power")
Signed-off-by: Bryam Vargas <bryamestebanvargas at gmail.com>
---
 .../net/wireless/mediatek/mt76/mt7921/main.c  | 27 ++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
index 67383c4..35454e5 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7921/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7921/main.c
@@ -1517,6 +1517,31 @@ static void mt7921_rfkill_poll(struct ieee80211_hw *hw)
     wiphy_rfkill_set_hw_state(hw->wiphy, ret ? false : true);
 }

+
+static int mt7921_get_txpower(struct ieee80211_hw *hw,
+                  struct ieee80211_vif *vif,
+                  unsigned int link_id, int *dbm)
+{
+    struct mt76_phy *phy = mt76_vif_phy(hw, vif);
+    struct mt76_power_limits limits;
+    int n_chains, delta;
+    s8 tx_power;
+
+    if (!phy)
+        return -EINVAL;
+
+    if (!phy->chandef.chan)
+        return mt76_get_txpower(hw, vif, link_id, dbm);
+
+    n_chains = hweight16(phy->chainmask);
+    delta = mt76_tx_power_path_delta(n_chains);
+    tx_power = mt76_get_power_bound(phy, phy->chandef.chan->max_power);
+    tx_power = mt76_get_rate_power_limits(phy, phy->chandef.chan,
+                          &limits, tx_power);
+    *dbm = DIV_ROUND_UP(tx_power + delta, 2);
+    return 0;
+}
+
 const struct ieee80211_ops mt7921_ops = {
     .tx = mt792x_tx,
     .start = mt7921_start,
@@ -1541,7 +1566,7 @@ const struct ieee80211_ops mt7921_ops = {
     .wake_tx_queue = mt76_wake_tx_queue,
     .release_buffered_frames = mt76_release_buffered_frames,
     .channel_switch_beacon = mt7921_channel_switch_beacon,
-    .get_txpower = mt76_get_txpower,
+    .get_txpower = mt7921_get_txpower,
     .get_stats = mt792x_get_stats,
     .get_et_sset_count = mt792x_get_et_sset_count,
     .get_et_strings = mt792x_get_et_strings,
--
2.43.0