mt76x2: initialize channel power limits at probe time

This allows user space to query the real hardware limits directly
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/mediatek/mt76/mt76x2_eeprom.c

@@ -483,6 +483,17 @@ void mt76x2_get_rate_power(struct mt76x2_dev *dev, struct mt76_rate_power *t,
 	t->vht[8] = t->vht[9] = mt76x2_rate_power_val(val >> 8);
 }
 
+int mt76x2_get_max_rate_power(struct mt76_rate_power *r)
+{
+	int i;
+	s8 ret = 0;
+
+	for (i = 0; i < sizeof(r->all); i++)
+		ret = max(ret, r->all[i]);
+
+	return ret;
+}
+
 static void
 mt76x2_get_power_info_2g(struct mt76x2_dev *dev, struct mt76x2_tx_power_info *t,
 		         struct ieee80211_channel *chan, int chain, int offset)

drivers/net/wireless/mediatek/mt76/mt76x2_eeprom.h

@@ -148,6 +148,7 @@ mt76x2_eeprom_get(struct mt76x2_dev *dev, enum mt76x2_eeprom_field field)
 
 void mt76x2_get_rate_power(struct mt76x2_dev *dev, struct mt76_rate_power *t,
 			   struct ieee80211_channel *chan);
+int mt76x2_get_max_rate_power(struct mt76_rate_power *r);
 void mt76x2_get_power_info(struct mt76x2_dev *dev,
 			   struct mt76x2_tx_power_info *t,
 			   struct ieee80211_channel *chan);

drivers/net/wireless/mediatek/mt76/mt76x2_init.c

@@ -760,6 +760,34 @@ static void mt76x2_led_set_brightness(struct led_classdev *led_cdev,
 		mt76x2_led_set_config(mt76, 0xff, 0);
 }
 
+static void
+mt76x2_init_txpower(struct mt76x2_dev *dev,
+		    struct ieee80211_supported_band *sband)
+{
+	struct ieee80211_channel *chan;
+	struct mt76x2_tx_power_info txp;
+	struct mt76_rate_power t = {};
+	int target_power;
+	int i;
+
+	for (i = 0; i < sband->n_channels; i++) {
+		chan = &sband->channels[i];
+
+		mt76x2_get_power_info(dev, &txp, chan);
+
+		target_power = max_t(int, (txp.chain[0].target_power +
+					   txp.chain[0].delta),
+					  (txp.chain[1].target_power +
+					   txp.chain[1].delta));
+
+		mt76x2_get_rate_power(dev, &t, chan);
+
+		chan->max_power = mt76x2_get_max_rate_power(&t) +
+				  target_power;
+		chan->max_power /= 2;
+	}
+}
+
 int mt76x2_register_device(struct mt76x2_dev *dev)
 {
 	struct ieee80211_hw *hw = mt76_hw(dev);
@@ -828,6 +856,8 @@ int mt76x2_register_device(struct mt76x2_dev *dev)
 		goto fail;
 
 	mt76x2_init_debugfs(dev);
+	mt76x2_init_txpower(dev, &dev->mt76.sband_2g.sband);
+	mt76x2_init_txpower(dev, &dev->mt76.sband_5g.sband);
 
 	return 0;
 

drivers/net/wireless/mediatek/mt76/mt76x2_phy.c

@@ -102,18 +102,6 @@ mt76x2_limit_rate_power(struct mt76_rate_power *r, int limit)
 			r->all[i] = limit;
 }
 
-static int
-mt76x2_get_max_power(struct mt76_rate_power *r)
-{
-	int i;
-	s8 ret = 0;
-
-	for (i = 0; i < sizeof(r->all); i++)
-		ret = max(ret, r->all[i]);
-
-	return ret;
-}
-
 void mt76x2_phy_set_txpower(struct mt76x2_dev *dev)
 {
 	enum nl80211_chan_width width = dev->mt76.chandef.width;
@@ -136,7 +124,7 @@ void mt76x2_phy_set_txpower(struct mt76x2_dev *dev)
 	mt76x2_add_rate_power_offset(&t, txp.chain[0].target_power +
 				   txp.chain[0].delta);
 	mt76x2_limit_rate_power(&t, dev->txpower_conf);
-	dev->txpower_cur = mt76x2_get_max_power(&t);
+	dev->txpower_cur = mt76x2_get_max_rate_power(&t);
 	mt76x2_add_rate_power_offset(&t, -(txp.chain[0].target_power +
 					 txp.chain[0].delta + delta));
 	dev->target_power = txp.chain[0].target_power;