wifi: mt76: mt792x: build iface combinations dynamically

Move mt792x interface combination selection into a helper and store the
selected table in mt792x device state.

This keeps the existing non-CNM and CNM combinations unchanged while
making later firmware-gated extensions add combinations without touching
the common wiphy setup path.

Co-developed-by: Stella Liu <yu-ching.liu@mediatek.com>
Signed-off-by: Stella Liu <yu-ching.liu@mediatek.com>
Co-developed-by: Jeremy Yu <chengwei.yu@mediatek.com>
Signed-off-by: Jeremy Yu <chengwei.yu@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Link: https://patch.msgid.link/20260625001834.475094-9-sean.wang@kernel.org
Signed-off-by: Felix Fietkau <nbd@nbd.name>

2 files changed, 30 insertions, 8 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt792x.h b/drivers/net/wireless/mediatek/mt76/mt792x.h
index 319dc3ba8434..e98c4fd81044 100644
--- a/drivers/net/wireless/mediatek/mt76/mt792x.h
+++ b/drivers/net/wireless/mediatek/mt76/mt792x.h
@@ -337,6 +337,8 @@ struct mt792x_dev {
 	struct ieee80211_chanctx_conf *new_ctx;
 
 	struct ieee80211_vif *nan_vif;
+	const struct ieee80211_iface_combination *iface_combinations;
+	int n_iface_combinations;
 };
 
 static inline struct mt792x_bss_conf *
diff --git a/drivers/net/wireless/mediatek/mt76/mt792x_core.c b/drivers/net/wireless/mediatek/mt76/mt792x_core.c
index 8fc643fc0dfe..0c74fedf07e3 100644
--- a/drivers/net/wireless/mediatek/mt76/mt792x_core.c
+++ b/drivers/net/wireless/mediatek/mt76/mt792x_core.c
@@ -60,7 +60,7 @@ static const struct ieee80211_iface_limit if_limits_chanctx_scc[] = {
 	}
 };
 
-static const struct ieee80211_iface_combination if_comb_chanctx[] = {
+static const struct ieee80211_iface_combination if_comb_chanctx_base[] = {
 	{
 		.limits = if_limits_chanctx_mcc,
 		.n_limits = ARRAY_SIZE(if_limits_chanctx_mcc),
@@ -77,6 +77,22 @@ static const struct ieee80211_iface_combination if_comb_chanctx[] = {
 	}
 };
 
+static int mt792x_setup_iface_combinations(struct mt792x_dev *dev)
+{
+	const bool cnm = !!(dev->fw_features & MT792x_FW_CAP_CNM);
+
+	if (!cnm) {
+		dev->iface_combinations = if_comb;
+		dev->n_iface_combinations = ARRAY_SIZE(if_comb);
+		return 0;
+	}
+
+	dev->iface_combinations = if_comb_chanctx_base;
+	dev->n_iface_combinations = ARRAY_SIZE(if_comb_chanctx_base);
+
+	return 0;
+}
+
 void mt792x_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control,
 	       struct sk_buff *skb)
 {
@@ -663,6 +679,7 @@ int mt792x_init_wiphy(struct ieee80211_hw *hw)
 	struct mt792x_phy *phy = mt792x_hw_phy(hw);
 	struct mt792x_dev *dev = phy->dev;
 	struct wiphy *wiphy = hw->wiphy;
+	int err;
 
 	hw->queues = 4;
 	if (dev->has_eht) {
@@ -683,15 +700,17 @@ int mt792x_init_wiphy(struct ieee80211_hw *hw)
 	hw->vif_data_size = sizeof(struct mt792x_vif);
 	hw->chanctx_data_size = sizeof(struct mt792x_chanctx);
 
-	if (dev->fw_features & MT792x_FW_CAP_CNM) {
+	if (dev->fw_features & MT792x_FW_CAP_CNM)
 		wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
-		wiphy->iface_combinations = if_comb_chanctx;
-		wiphy->n_iface_combinations = ARRAY_SIZE(if_comb_chanctx);
-	} else {
+	else
 		wiphy->flags &= ~WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
-		wiphy->iface_combinations = if_comb;
-		wiphy->n_iface_combinations = ARRAY_SIZE(if_comb);
-	}
+
+	err = mt792x_setup_iface_combinations(dev);
+	if (err)
+		return err;
+
+	wiphy->iface_combinations = dev->iface_combinations;
+	wiphy->n_iface_combinations = dev->n_iface_combinations;
 	wiphy->flags &= ~(WIPHY_FLAG_IBSS_RSN | WIPHY_FLAG_4ADDR_AP |
 			  WIPHY_FLAG_4ADDR_STATION);
 	wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
@@ -699,6 +718,7 @@ int mt792x_init_wiphy(struct ieee80211_hw *hw)
 				 BIT(NL80211_IFTYPE_P2P_CLIENT) |
 				 BIT(NL80211_IFTYPE_P2P_GO) |
 				 BIT(NL80211_IFTYPE_P2P_DEVICE);
+
 	wiphy->max_scan_ie_len = MT76_CONNAC_SCAN_IE_LEN;
 	wiphy->max_scan_ssids = 4;
 	wiphy->max_sched_scan_plan_interval =