[PATCH v2 1/3] wifi: mt76: connac: use a helper to cache txpower_cur

[Sean Wang <sean.wang@kernel.org>]

From: Sean Wang <sean.wang@mediatek.com>

The cached txpower value is derived from the bounded channel power after
applying the chainmask path delta.

Use a helper for that conversion so callers do not open-code it.

Reported-by: Devin Wittmayer <lucid_duck@justthetip.ca>
Closes: https://lore.kernel.org/linux-wireless/20260130215839.53270-1-lucid_duck@justthetip.ca/
Tested-by: Devin Wittmayer <lucid_duck@justthetip.ca>
Tested-by: Satadru Pramanik <satadru@gmail.com>
Co-developed-by: Devin Wittmayer <lucid_duck@justthetip.ca>
Signed-off-by: Devin Wittmayer <lucid_duck@justthetip.ca>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
--
v2:
- Rebased onto the latest mt76 tree
- Added Reported-by, Tested-by, Co-developed-by and Signed-off-by tags
---
 drivers/net/wireless/mediatek/mt76/mt76_connac.h     |  2 +-
 drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c |  9 +++++++++
 drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c | 11 ++++++++---
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac.h b/drivers/net/wireless/mediatek/mt76/mt76_connac.h
index 51423c7740bd..d0953e02810b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac.h
@@ -420,7 +420,7 @@ mt76_connac_mutex_release(struct mt76_dev *dev, struct mt76_connac_pm *pm)
 void mt76_connac_gen_ppe_thresh(u8 *he_ppet, int nss, enum nl80211_band band);
 int mt76_connac_init_tx_queues(struct mt76_phy *phy, int idx, int n_desc,
 			       int ring_base, void *wed, u32 flags);
-
+void mt76_connac_set_txpower_cur(struct mt76_phy *phy, s8 max_power);
 void mt76_connac_write_hw_txp(struct mt76_dev *dev,
 			      struct mt76_tx_info *tx_info,
 			      void *txp_ptr, u32 id);
diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c
index 0339e2e7ab60..b2daa6c7d061 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mac.c
@@ -275,6 +275,15 @@ int mt76_connac_init_tx_queues(struct mt76_phy *phy, int idx, int n_desc,
 }
 EXPORT_SYMBOL_GPL(mt76_connac_init_tx_queues);
 
+void mt76_connac_set_txpower_cur(struct mt76_phy *phy, s8 max_power)
+{
+	int delta;
+
+	delta = mt76_tx_power_path_delta(hweight16(phy->chainmask));
+	phy->txpower_cur = max_power - delta;
+}
+EXPORT_SYMBOL_GPL(mt76_connac_set_txpower_cur);
+
 #define __bitrate_mask_check(_mcs, _mode)				\
 ({									\
 	u8 i = 0;							\
diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
index 89bd52ea8bf7..897b065a2be6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac_mcu.c
@@ -2223,14 +2223,19 @@ mt76_connac_mcu_rate_txpower_band(struct mt76_phy *phy,
 				.hw_value = ch_list[idx],
 				.band = band,
 			};
-			s8 reg_power, sar_power;
+			s8 reg_power, sar_power, max_power;
 
 			reg_power = mt76_connac_get_ch_power(phy, &chan,
 							     tx_power);
 			sar_power = mt76_get_sar_power(phy, &chan, reg_power);
 
-			mt76_get_rate_power_limits(phy, &chan, limits,
-						   sar_power);
+			max_power = mt76_get_rate_power_limits(phy, &chan, limits,
+							       sar_power);
+
+			if (phy->chandef.chan &&
+			    phy->chandef.chan->hw_value == ch_list[idx] &&
+			    phy->chandef.chan->band == band)
+				mt76_connac_set_txpower_cur(phy, max_power);
 
 			tx_power_tlv.last_msg = ch_list[idx] == last_ch;
 			sku_tlbv.channel = ch_list[idx];
-- 
2.43.0