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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 <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2019-12-14 20:08:59 +01:00
parent a25c888f3a
commit e5051965fd
6 changed files with 60 additions and 0 deletions
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4
drivers/net/wireless/mediatek/mt76/mac80211.c
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@ -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);

2
drivers/net/wireless/mediatek/mt76/mt76.h
View File

@ -328,6 +328,8 @@ struct mt76_channel_state {
u64 cc_rx;
u64 cc_bss_rx;
u64 cc_tx;
s8 noise;
};
struct mt76_sband {

42
drivers/net/wireless/mediatek/mt76/mt7615/mac.c
View File

@ -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)

3
drivers/net/wireless/mediatek/mt76/mt7615/main.c
View File

@ -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);

3
drivers/net/wireless/mediatek/mt76/mt7615/mt7615.h
View File

@ -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,

6
drivers/net/wireless/mediatek/mt76/mt7615/regs.h
View File

@ -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))