mt76x0: phy: align channel gain logic to mt76x2 one

Update vga tuning algorithm to the one used in mt76x2 driver

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@redhat.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/drivers/net/wireless/mediatek/mt76/mt76x0/phy.c b/drivers/net/wireless/mediatek/mt76/mt76x0/phy.c
index 7d29fd16342aca69f393ab314998768429f668c9..3d0fcf8c34b4e8eb9de9de8629096f4dcb229be1 100644 (file)
--- a/drivers/net/wireless/mediatek/mt76/mt76x0/phy.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x0/phy.c
@@ -719,6 +719,7 @@ int mt76x0_phy_set_channel(struct mt76x02_dev *dev,
 
        mt76x0_read_rx_gain(dev);
        mt76x0_phy_set_chan_bbp_params(dev, rf_bw_band);
+       mt76x02_init_agc_gain(dev);
 
        if (mt76_is_usb(dev)) {
                mt76x0_vco_cal(dev, channel);
@@ -820,23 +821,44 @@ done:
        rf_wr(dev, MT_RF(0, 67), rf_b0_67);
 }
 
-static void mt76x0_dynamic_vga_tuning(struct mt76x02_dev *dev)
+static void mt76x0_phy_set_gain_val(struct mt76x02_dev *dev)
 {
-       struct cfg80211_chan_def *chandef = &dev->mt76.chandef;
-       u32 val, init_vga;
-       int avg_rssi;
-
-       init_vga = chandef->chan->band == NL80211_BAND_5GHZ ? 0x54 : 0x4E;
-       avg_rssi = mt76x02_phy_get_min_avg_rssi(dev);
-       if (avg_rssi > -60)
-               init_vga -= 0x20;
-       else if (avg_rssi > -70)
-               init_vga -= 0x10;
-
-       val = mt76_rr(dev, MT_BBP(AGC, 8));
-       val &= 0xFFFF80FF;
-       val |= init_vga << 8;
-       mt76_wr(dev, MT_BBP(AGC,8), val);
+       u8 gain = dev->cal.agc_gain_cur[0] - dev->cal.agc_gain_adjust;
+       u32 val = 0x122c << 16 | 0xf2;
+
+       mt76_wr(dev, MT_BBP(AGC, 8),
+               val | FIELD_PREP(MT_BBP_AGC_GAIN, gain));
+}
+
+static void
+mt76x0_phy_update_channel_gain(struct mt76x02_dev *dev)
+{
+       bool gain_change;
+       u8 gain_delta;
+       int low_gain;
+
+       dev->cal.avg_rssi_all = mt76x02_phy_get_min_avg_rssi(dev);
+
+       low_gain = (dev->cal.avg_rssi_all > mt76x02_get_rssi_gain_thresh(dev)) +
+                  (dev->cal.avg_rssi_all > mt76x02_get_low_rssi_gain_thresh(dev));
+
+       gain_change = (dev->cal.low_gain & 2) ^ (low_gain & 2);
+       dev->cal.low_gain = low_gain;
+
+       if (!gain_change) {
+               if (mt76x02_phy_adjust_vga_gain(dev))
+                       mt76x0_phy_set_gain_val(dev);
+               return;
+       }
+
+       dev->cal.agc_gain_adjust = (low_gain == 2) ? 0 : 10;
+       gain_delta = (low_gain == 2) ? 10 : 0;
+
+       dev->cal.agc_gain_cur[0] = dev->cal.agc_gain_init[0] - gain_delta;
+       mt76x0_phy_set_gain_val(dev);
+
+       /* clear false CCA counters */
+       mt76_rr(dev, MT_RX_STAT_1);
 }
 
 static void mt76x0_phy_calibration_work(struct work_struct *work)
@@ -844,7 +866,7 @@ static void mt76x0_phy_calibration_work(struct work_struct *work)
        struct mt76x02_dev *dev = container_of(work, struct mt76x02_dev,
                                               cal_work.work);
 
-       mt76x0_dynamic_vga_tuning(dev);
+       mt76x0_phy_update_channel_gain(dev);
        if (!mt76x0_tssi_enabled(dev))
                mt76x0_temp_sensor(dev);