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mt76x2: implement dynamic AGC tuning based on false packet detection count

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Significantly improves radio performance

Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Felix Fietkau
2017-11-16 20:34:46 +01:00
parent cc588c5e32
commit 60a4d67ca9
3 changed files with 79 additions and 23 deletions
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mt76x2.h
+3
View File
@@ -64,9 +64,12 @@ struct mt76x2_calibration {
struct mt76x2_rx_freq_cal rx;
u8 agc_gain_init[MT_MAX_CHAINS];
u8 agc_gain_cur[MT_MAX_CHAINS];
int avg_rssi[MT_MAX_CHAINS];
int avg_rssi_all;
s8 agc_gain_adjust;
s8 low_gain;
u8 temp;
mt76x2_phy.c
+75 -23
View File
@@ -406,25 +406,27 @@ mt76x2_get_rssi_gain_thresh(struct mt76x2_dev *dev)
}
}
static void
mt76x2_phy_update_channel_gain(struct mt76x2_dev *dev)
static int
mt76x2_get_low_rssi_gain_thresh(struct mt76x2_dev *dev)
{
u32 val = mt76_rr(dev, MT_BBP(AGC, 20));
int rssi0 = (s8) FIELD_GET(MT_BBP_AGC20_RSSI0, val);
int rssi1 = (s8) FIELD_GET(MT_BBP_AGC20_RSSI1, val);
u8 *gain = dev->cal.agc_gain_init, gain_delta;
bool low_gain;
switch (dev->mt76.chandef.width) {
case NL80211_CHAN_WIDTH_80:
return -76;
case NL80211_CHAN_WIDTH_40:
return -79;
default:
return -82;
}
}
dev->cal.avg_rssi[0] = (dev->cal.avg_rssi[0] * 15) / 16 + (rssi0 << 8);
dev->cal.avg_rssi[1] = (dev->cal.avg_rssi[1] * 15) / 16 + (rssi1 << 8);
dev->cal.avg_rssi_all = (dev->cal.avg_rssi[0] +
dev->cal.avg_rssi[1]) / 512;
static void
mt76x2_phy_set_gain_val(struct mt76x2_dev *dev)
{
u32 val;
u8 gain_val[2];
low_gain = dev->cal.avg_rssi_all > mt76x2_get_rssi_gain_thresh(dev);
if (dev->cal.low_gain == low_gain)
return;
dev->cal.low_gain = low_gain;
gain_val[0] = dev->cal.agc_gain_cur[0] - dev->cal.agc_gain_adjust;
gain_val[1] = dev->cal.agc_gain_cur[1] - dev->cal.agc_gain_adjust;
if (dev->mt76.chandef.width >= NL80211_CHAN_WIDTH_40)
val = 0x1e42 << 16;
@@ -433,6 +435,57 @@ mt76x2_phy_update_channel_gain(struct mt76x2_dev *dev)
val |= 0xf8;
mt76_wr(dev, MT_BBP(AGC, 8),
val | FIELD_PREP(MT_BBP_AGC_GAIN, gain_val[0]));
mt76_wr(dev, MT_BBP(AGC, 9),
val | FIELD_PREP(MT_BBP_AGC_GAIN, gain_val[1]));
if (dev->mt76.chandef.chan->flags & IEEE80211_CHAN_RADAR)
mt76x2_dfs_adjust_agc(dev);
}
static void
mt76x2_phy_adjust_vga_gain(struct mt76x2_dev *dev)
{
u32 false_cca;
u8 limit = dev->cal.low_gain > 1 ? 4 : 16;
false_cca = FIELD_GET(MT_RX_STAT_1_CCA_ERRORS, mt76_rr(dev, MT_RX_STAT_1));
if (false_cca > 800 && dev->cal.agc_gain_adjust < limit)
dev->cal.agc_gain_adjust += 2;
else if (false_cca < 10 && dev->cal.agc_gain_adjust > 0)
dev->cal.agc_gain_adjust -= 2;
else
return;
mt76x2_phy_set_gain_val(dev);
}
static void
mt76x2_phy_update_channel_gain(struct mt76x2_dev *dev)
{
u32 val = mt76_rr(dev, MT_BBP(AGC, 20));
int rssi0 = (s8) FIELD_GET(MT_BBP_AGC20_RSSI0, val);
int rssi1 = (s8) FIELD_GET(MT_BBP_AGC20_RSSI1, val);
u8 *gain = dev->cal.agc_gain_init;
u8 gain_delta;
int low_gain;
dev->cal.avg_rssi[0] = (dev->cal.avg_rssi[0] * 15) / 16 + (rssi0 << 8);
dev->cal.avg_rssi[1] = (dev->cal.avg_rssi[1] * 15) / 16 + (rssi1 << 8);
dev->cal.avg_rssi_all = (dev->cal.avg_rssi[0] +
dev->cal.avg_rssi[1]) / 512;
low_gain = (dev->cal.avg_rssi_all > mt76x2_get_rssi_gain_thresh(dev)) +
(dev->cal.avg_rssi_all > mt76x2_get_low_rssi_gain_thresh(dev));
if (dev->cal.low_gain == low_gain) {
mt76x2_phy_adjust_vga_gain(dev);
return;
}
dev->cal.low_gain = low_gain;
if (dev->mt76.chandef.width == NL80211_CHAN_WIDTH_80)
mt76_wr(dev, MT_BBP(RXO, 14), 0x00560411);
else
@@ -454,13 +507,10 @@ mt76x2_phy_update_channel_gain(struct mt76x2_dev *dev)
gain_delta = 0;
}
mt76_wr(dev, MT_BBP(AGC, 8),
val | FIELD_PREP(MT_BBP_AGC_GAIN, gain[0] - gain_delta));
mt76_wr(dev, MT_BBP(AGC, 9),
val | FIELD_PREP(MT_BBP_AGC_GAIN, gain[1] - gain_delta));
if (dev->mt76.chandef.chan->flags & IEEE80211_CHAN_RADAR)
mt76x2_dfs_adjust_agc(dev);
dev->cal.agc_gain_cur[0] = gain[0] - gain_delta;
dev->cal.agc_gain_cur[1] = gain[1] - gain_delta;
dev->cal.agc_gain_adjust = 0;
mt76x2_phy_set_gain_val(dev);
}
int mt76x2_phy_set_channel(struct mt76x2_dev *dev,
@@ -591,6 +641,8 @@ int mt76x2_phy_set_channel(struct mt76x2_dev *dev,
dev->cal.low_gain = -1;
mt76x2_phy_channel_calibrate(dev, true);
mt76x2_get_agc_gain(dev, dev->cal.agc_gain_init);
memcpy(dev->cal.agc_gain_cur, dev->cal.agc_gain_init,
sizeof(dev->cal.agc_gain_cur));
ieee80211_queue_delayed_work(mt76_hw(dev), &dev->cal_work,
MT_CALIBRATE_INTERVAL);
mt76x2_regs.h
+1
View File
@@ -511,6 +511,7 @@
#define MT_BBP_AGC_LNA_ULOW_GAIN GENMASK(5, 0)
/* AGC, R8/R9 */
#define MT_BBP_AGC_LNA_GAIN_MODE GENMASK(7, 6)
#define MT_BBP_AGC_GAIN GENMASK(14, 8)
#define MT_BBP_AGC20_RSSI0 GENMASK(7, 0)