mt76x0: phy: do not run calibration during channel switch

Do not perform phy/vga calibration during channel switch.
Moreover remove mt76x0_agc_save and mt76x0_agc_restore routines
since they are no longer necessary. Furthermore run mt76_set_channel
in order to check if there are pending frames during channel switch
Signed-off-by: NLorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: NFelix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt76x0/main.c

@@ -16,6 +16,20 @@
 #include <linux/etherdevice.h>
 #include "mt76x0.h"
 
+static int
+mt76x0_set_channel(struct mt76x02_dev *dev, struct cfg80211_chan_def *chandef)
+{
+	int ret;
+
+	cancel_delayed_work_sync(&dev->cal_work);
+
+	mt76_set_channel(&dev->mt76);
+	ret = mt76x0_phy_set_channel(dev, chandef);
+	mt76_txq_schedule_all(&dev->mt76);
+
+	return ret;
+}
+
 int mt76x0_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct mt76x02_dev *dev = hw->priv;
@@ -25,7 +39,7 @@ int mt76x0_config(struct ieee80211_hw *hw, u32 changed)
 
 	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
 		ieee80211_stop_queues(hw);
-		ret = mt76x0_phy_set_channel(dev, &hw->conf.chandef);
+		ret = mt76x0_set_channel(dev, &hw->conf.chandef);
 		ieee80211_wake_queues(hw);
 	}
 
@@ -114,8 +128,6 @@ void mt76x0_sw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 {
 	struct mt76x02_dev *dev = hw->priv;
 
-	cancel_delayed_work_sync(&dev->cal_work);
-	mt76x0_agc_save(dev);
 	set_bit(MT76_SCANNING, &dev->mt76.state);
 }
 EXPORT_SYMBOL_GPL(mt76x0_sw_scan);
@@ -125,11 +137,7 @@ void mt76x0_sw_scan_complete(struct ieee80211_hw *hw,
 {
 	struct mt76x02_dev *dev = hw->priv;
 
-	mt76x0_agc_restore(dev);
 	clear_bit(MT76_SCANNING, &dev->mt76.state);
-
-	ieee80211_queue_delayed_work(dev->mt76.hw, &dev->cal_work,
-				     MT_CALIBRATE_INTERVAL);
 }
 EXPORT_SYMBOL_GPL(mt76x0_sw_scan_complete);
 

drivers/net/wireless/mediatek/mt76/mt76x0/mt76x0.h

@@ -66,8 +66,6 @@ int mt76x0_set_rts_threshold(struct ieee80211_hw *hw, u32 value);
 /* PHY */
 void mt76x0_phy_init(struct mt76x02_dev *dev);
 int mt76x0_wait_bbp_ready(struct mt76x02_dev *dev);
-void mt76x0_agc_save(struct mt76x02_dev *dev);
-void mt76x0_agc_restore(struct mt76x02_dev *dev);
 int mt76x0_phy_set_channel(struct mt76x02_dev *dev,
 			    struct cfg80211_chan_def *chandef);
 void mt76x0_phy_recalibrate_after_assoc(struct mt76x02_dev *dev);

drivers/net/wireless/mediatek/mt76/mt76x0/phy.c

@@ -723,17 +723,21 @@ int mt76x0_phy_set_channel(struct mt76x02_dev *dev,
 
 	if (mt76_is_usb(dev)) {
 		mt76x0_vco_cal(dev, channel);
-		if (scan)
-			mt76x02_mcu_calibrate(dev, MCU_CAL_RXDCOC, 1,
-					      false);
 	} else {
 		/* enable vco */
 		rf_set(dev, MT_RF(0, 4), BIT(7));
-		mt76x0_phy_calibrate(dev, false);
 	}
 
+	if (scan)
+		return 0;
+
+	if (mt76_is_mmio(dev))
+		mt76x0_phy_calibrate(dev, false);
 	mt76x0_phy_set_txpower(dev);
 
+	ieee80211_queue_delayed_work(dev->mt76.hw, &dev->cal_work,
+				     MT_CALIBRATE_INTERVAL);
+
 	return 0;
 }
 
@@ -770,17 +774,6 @@ void mt76x0_phy_recalibrate_after_assoc(struct mt76x02_dev *dev)
 	mt76x02_mcu_calibrate(dev, MCU_CAL_RXDCOC, 1, false);
 }
 
-void mt76x0_agc_save(struct mt76x02_dev *dev)
-{
-	/* Only one RX path */
-	dev->agc_save = FIELD_GET(MT_BBP_AGC_GAIN, mt76_rr(dev, MT_BBP(AGC, 8)));
-}
-
-void mt76x0_agc_restore(struct mt76x02_dev *dev)
-{
-	mt76_rmw_field(dev, MT_BBP(AGC, 8), MT_BBP_AGC_GAIN, dev->agc_save);
-}
-
 static void mt76x0_temp_sensor(struct mt76x02_dev *dev)
 {
 	u8 rf_b7_73, rf_b0_66, rf_b0_67;

drivers/net/wireless/mediatek/mt76/mt76x02.h

@@ -102,8 +102,6 @@ struct mt76x02_dev {
 
 	bool no_2ghz;
 
-	u8 agc_save;
-
 	u8 coverage_class;
 	u8 slottime;