From e5051965fd2b2fee3b9c332a9a9412841883decb Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 14 Dec 2019 20:08:59 +0100 Subject: [PATCH] mt76: mt7615: measure channel noise and report it via survey Read measurements every 100 ms and build a simple moving average Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/mac80211.c | 4 ++ drivers/net/wireless/mediatek/mt76/mt76.h | 2 + .../net/wireless/mediatek/mt76/mt7615/mac.c | 42 +++++++++++++++++++ .../net/wireless/mediatek/mt76/mt7615/main.c | 3 ++ .../wireless/mediatek/mt76/mt7615/mt7615.h | 3 ++ .../net/wireless/mediatek/mt76/mt7615/regs.h | 6 +++ 6 files changed, 60 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/mac80211.c b/drivers/net/wireless/mediatek/mt76/mac80211.c index 8cc09aa6fe61..d752fb539351 100644 --- a/drivers/net/wireless/mediatek/mt76/mac80211.c +++ b/drivers/net/wireless/mediatek/mt76/mac80211.c @@ -618,6 +618,9 @@ int mt76_get_survey(struct ieee80211_hw *hw, int idx, survey->channel = chan; survey->filled = SURVEY_INFO_TIME | SURVEY_INFO_TIME_BUSY; survey->filled |= dev->drv->survey_flags; + if (state->noise) + survey->filled |= SURVEY_INFO_NOISE_DBM; + if (chan == phy->main_chan) { survey->filled |= SURVEY_INFO_IN_USE; @@ -628,6 +631,7 @@ int mt76_get_survey(struct ieee80211_hw *hw, int idx, survey->time_busy = div_u64(state->cc_busy, 1000); survey->time_rx = div_u64(state->cc_rx, 1000); survey->time = div_u64(state->cc_active, 1000); + survey->noise = state->noise; spin_lock_bh(&dev->cc_lock); survey->time_bss_rx = div_u64(state->cc_bss_rx, 1000); diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 7034e901098a..c050d95dc7ac 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -328,6 +328,8 @@ struct mt76_channel_state { u64 cc_rx; u64 cc_bss_rx; u64 cc_tx; + + s8 noise; }; struct mt76_sband { diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c index 903b8395a446..1b52d8b79496 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c @@ -1379,6 +1379,19 @@ out: mutex_unlock(&dev->mt76.mutex); } +void mt7615_mac_enable_nf(struct mt7615_dev *dev, bool ext_phy) +{ + u32 rxtd; + + if (ext_phy) + rxtd = MT_WF_PHY_RXTD2(10); + else + rxtd = MT_WF_PHY_RXTD(12); + + mt76_set(dev, rxtd, BIT(18) | BIT(29)); + mt76_set(dev, MT_WF_PHY_R0_PHYMUX_5(ext_phy), 0x5 << 12); +} + void mt7615_mac_cca_stats_reset(struct mt7615_phy *phy) { struct mt7615_dev *dev = phy->dev; @@ -1511,13 +1524,35 @@ mt7615_mac_scs_check(struct mt7615_phy *phy) mt7615_mac_set_default_sensitivity(phy); } +static u8 +mt7615_phy_get_nf(struct mt7615_dev *dev, int idx) +{ + static const u8 nf_power[] = { 92, 89, 86, 83, 80, 75, 70, 65, 60, 55, 52 }; + u32 reg = idx ? MT_WF_PHY_RXTD2(17) : MT_WF_PHY_RXTD(20); + u32 val, sum = 0, n = 0; + int i; + + for (i = 0; i < ARRAY_SIZE(nf_power); i++, reg += 4) { + val = mt76_rr(dev, reg); + sum += val * nf_power[i]; + n += val; + } + + if (!n) + return 0; + + return sum / n; +} + static void mt7615_phy_update_channel(struct mt76_phy *mphy, int idx) { struct mt7615_dev *dev = container_of(mphy->dev, struct mt7615_dev, mt76); + struct mt7615_phy *phy = mphy->priv; struct mt76_channel_state *state; u64 busy_time, tx_time, rx_time, obss_time; u32 obss_reg = idx ? MT_WF_RMAC_MIB_TIME6 : MT_WF_RMAC_MIB_TIME5; + int nf; busy_time = mt76_get_field(dev, MT_MIB_SDR9(idx), MT_MIB_SDR9_BUSY_MASK); @@ -1527,11 +1562,18 @@ mt7615_phy_update_channel(struct mt76_phy *mphy, int idx) MT_MIB_SDR37_RXTIME_MASK); obss_time = mt76_get_field(dev, obss_reg, MT_MIB_OBSSTIME_MASK); + nf = mt7615_phy_get_nf(dev, idx); + if (!phy->noise) + phy->noise = nf << 4; + else if (nf) + phy->noise += nf - (phy->noise >> 4); + state = mphy->chan_state; state->cc_busy += busy_time; state->cc_tx += tx_time; state->cc_rx += rx_time + obss_time; state->cc_bss_rx += rx_time; + state->noise = -(phy->noise >> 4); } void mt7615_update_channel(struct mt76_dev *mdev) diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/main.c b/drivers/net/wireless/mediatek/mt76/mt7615/main.c index 77b35accd5d2..52c502af4d4d 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/main.c +++ b/drivers/net/wireless/mediatek/mt76/mt7615/main.c @@ -40,11 +40,13 @@ static int mt7615_start(struct ieee80211_hw *hw) if (!running) { mt7615_mcu_ctrl_pm_state(dev, 0, 0); mt7615_mcu_set_mac_enable(dev, 0, true); + mt7615_mac_enable_nf(dev, 0); } if (phy != &dev->phy) { mt7615_mcu_ctrl_pm_state(dev, 1, 0); mt7615_mcu_set_mac_enable(dev, 1, true); + mt7615_mac_enable_nf(dev, 1); } set_bit(MT76_STATE_RUNNING, &phy->mt76->state); @@ -238,6 +240,7 @@ static int mt7615_set_channel(struct mt7615_phy *phy) mt7615_mac_cca_stats_reset(phy); mt7615_mac_reset_counters(dev); + phy->noise = 0; out: clear_bit(MT76_RESET, &phy->mt76->state); diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h index 48810eda1cd6..eaafae9cc279 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h @@ -94,6 +94,8 @@ struct mt7615_phy { u32 rxfilter; u32 omac_mask; + u16 noise; + unsigned long last_cca_adj; int false_cca_ofdm, false_cca_cck; s8 ofdm_sensitivity; @@ -288,6 +290,7 @@ bool mt7615_mac_wtbl_update(struct mt7615_dev *dev, int idx, u32 mask); void mt7615_mac_reset_counters(struct mt7615_dev *dev); void mt7615_mac_cca_stats_reset(struct mt7615_phy *phy); void mt7615_mac_set_scs(struct mt7615_dev *dev, bool enable); +void mt7615_mac_enable_nf(struct mt7615_dev *dev, bool ext_phy); void mt7615_mac_sta_poll(struct mt7615_dev *dev); int mt7615_mac_write_txwi(struct mt7615_dev *dev, __le32 *txwi, struct sk_buff *skb, struct mt76_wcid *wcid, diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/regs.h b/drivers/net/wireless/mediatek/mt76/mt7615/regs.h index 26d121646787..46db0faae93d 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/regs.h +++ b/drivers/net/wireless/mediatek/mt76/mt7615/regs.h @@ -104,6 +104,9 @@ #define MT_WF_PHY_B1_PD_OFDM(v) ((v) << 16) #define MT_WF_PHY_B1_PD_BLK BIT(25) +#define MT_WF_PHY_RXTD_BASE MT_WF_PHY(0x2200) +#define MT_WF_PHY_RXTD(_n) (MT_WF_PHY_RXTD_BASE + ((_n) << 2)) + #define MT_WF_PHY_B0_RXTD_CCK_PD MT_WF_PHY(0x2310) #define MT_WF_PHY_B0_PD_CCK_MASK GENMASK(8, 1) #define MT_WF_PHY_B0_PD_CCK(v) ((v) << 1) @@ -112,6 +115,9 @@ #define MT_WF_PHY_B1_PD_CCK_MASK GENMASK(31, 24) #define MT_WF_PHY_B1_PD_CCK(v) ((v) << 24) +#define MT_WF_PHY_RXTD2_BASE MT_WF_PHY(0x2a00) +#define MT_WF_PHY_RXTD2(_n) (MT_WF_PHY_RXTD2_BASE + ((_n) << 2)) + #define MT_WF_CFG_BASE 0x20200 #define MT_WF_CFG(ofs) (MT_WF_CFG_BASE + (ofs)) -- 2.20.1