+++ /dev/null
---- a/ath/if_ath.c
-+++ b/ath/if_ath.c
-@@ -383,6 +383,8 @@ static void ath_poll_disable(struct net_
- static void ath_poll_enable(struct net_device *dev);
- static void ath_fetch_idle_time(struct ath_softc *sc);
- static void ath_set_timing(struct ath_softc *sc);
-+static void ath_update_cca_thresh(struct ath_softc *sc);
-+static int ath_hw_read_nf(struct ath_softc *sc);
-
- /* calibrate every 30 secs in steady state but check every second at first. */
- static int ath_calinterval = ATH_SHORT_CALINTERVAL;
-@@ -2623,6 +2625,10 @@ ath_init(struct net_device *dev)
- goto done;
- }
-
-+ ath_hal_process_noisefloor(ah);
-+ ic->ic_channoise = ath_hal_get_channel_noise(ah, &(sc->sc_curchan));
-+ ath_update_cca_thresh(sc);
-+
- if (sc->sc_softled)
- ath_hal_gpioCfgOutput(ah, sc->sc_ledpin);
-
-@@ -3024,6 +3030,10 @@ ath_reset(struct net_device *dev)
- EPRINTF(sc, "Unable to reset hardware: '%s' (HAL status %u)\n",
- ath_get_hal_status_desc(status), status);
-
-+ ath_hal_process_noisefloor(ah);
-+ ic->ic_channoise = ath_hal_get_channel_noise(ah, &(sc->sc_curchan));
-+ ath_update_cca_thresh(sc);
-+
- ath_setintmit(sc);
- ath_update_txpow(sc); /* update tx power state */
- ath_radar_update(sc);
-@@ -9374,9 +9384,11 @@ ath_calibrate(unsigned long arg)
- sc->sc_curchan.channel);
- sc->sc_stats.ast_per_calfail++;
- }
-- ic->ic_channoise = ath_hal_get_channel_noise(ah, &(sc->sc_curchan));
-
- ath_hal_process_noisefloor(ah);
-+ ic->ic_channoise = ath_hal_get_channel_noise(ah, &(sc->sc_curchan));
-+ ath_update_cca_thresh(sc);
-+
- if (isIQdone == AH_TRUE) {
- /* Unless user has overridden calibration interval,
- * upgrade to less frequent calibration */
-@@ -9711,8 +9723,6 @@ ath_newstate(struct ieee80211vap *vap, e
- break;
- }
-
-- ath_hal_process_noisefloor(ah);
-- ic->ic_channoise = ath_hal_get_channel_noise(ah, &(sc->sc_curchan));
- /*
- * Reset rssi stats; maybe not the best place...
- */
-@@ -10968,6 +10978,7 @@ enum {
- ATH_INTMIT,
- ATH_NOISE_IMMUNITY,
- ATH_OFDM_WEAK_DET,
-+ ATH_CCA_THRESH,
- ATH_CHANBW,
- ATH_OUTDOOR,
- ATH_DISTANCE,
-@@ -11110,6 +11121,66 @@ ath_sysctl_get_intmit(struct ath_softc *
- return 0;
- }
-
-+#define AR_PHY_CCA 0x9864
-+#define AR_PHY_MINCCA_PWR 0x0FF80000
-+#define AR_PHY_MINCCA_PWR_S 19
-+#define AR_PHY_CCA_THRESH62 0x0007F000
-+#define AR_PHY_CCA_THRESH62_S 12
-+
-+static int
-+ath_nf_from_cca(u32 phy_cca)
-+{
-+ int nf = (phy_cca >> 19) & 0x1ff;
-+ nf = -((nf ^ 0x1ff) + 1);
-+ return nf;
-+}
-+
-+static int
-+ath_hw_read_nf(struct ath_softc *sc)
-+{
-+ return ath_nf_from_cca(OS_REG_READ(sc->sc_ah, AR_PHY_CCA));
-+}
-+
-+static void
-+ath_update_cca_thresh(struct ath_softc *sc)
-+{
-+ struct ath_hal *ah = sc->sc_ah;
-+ int newthr = 0;
-+ u32 phy_cca;
-+ int nf;
-+
-+ phy_cca = OS_REG_READ(ah, AR_PHY_CCA);
-+ if (sc->sc_cca_thresh < 0) {
-+ newthr = sc->sc_cca_thresh - ath_nf_from_cca(phy_cca);
-+
-+ /* 0xf is a typical eeprom value for thresh62,
-+ * use it as minimum for signal based thresholds
-+ * to prevent complete connection drops */
-+ if (newthr < 0xf)
-+ newthr = 0xf;
-+ } else {
-+ newthr = sc->sc_cca_thresh;
-+ }
-+
-+ if ((newthr < 4) || (newthr >= 127))
-+ return;
-+
-+ phy_cca &= ~AR_PHY_CCA_THRESH62;
-+ phy_cca |= newthr << AR_PHY_CCA_THRESH62_S;
-+ OS_REG_WRITE(ah, AR_PHY_CCA, phy_cca);
-+}
-+
-+static int
-+ath_get_cca_thresh(struct ath_softc *sc)
-+{
-+ struct ath_hal *ah = sc->sc_ah;
-+ u32 phy_cca;
-+
-+ phy_cca = OS_REG_READ(ah, AR_PHY_CCA);
-+ return ath_nf_from_cca(phy_cca) +
-+ ((phy_cca & AR_PHY_CCA_THRESH62) >> AR_PHY_CCA_THRESH62_S);
-+}
-+
- static int
- ATH_SYSCTL_DECL(ath_sysctl_hwinfo, ctl, write, filp, buffer, lenp, ppos)
- {
-@@ -11356,6 +11427,10 @@ ATH_SYSCTL_DECL(ath_sysctl_halparam, ctl
- case ATH_OFDM_WEAK_DET:
- ret = ath_sysctl_set_intmit(sc, (long)ctl->extra2, val);
- break;
-+ case ATH_CCA_THRESH:
-+ sc->sc_cca_thresh = val;
-+ ath_update_cca_thresh(sc);
-+ break;
- default:
- ret = -EINVAL;
- break;
-@@ -11436,6 +11511,9 @@ ATH_SYSCTL_DECL(ath_sysctl_halparam, ctl
- case ATH_OFDM_WEAK_DET:
- ret = ath_sysctl_get_intmit(sc, (long)ctl->extra2, &val);
- break;
-+ case ATH_CCA_THRESH:
-+ val = ath_get_cca_thresh(sc);
-+ break;
- default:
- ret = -EINVAL;
- break;
-@@ -11667,6 +11745,12 @@ static const ctl_table ath_sysctl_templa
- .proc_handler = ath_sysctl_halparam,
- .extra2 = (void *)ATH_OFDM_WEAK_DET,
- },
-+ { .ctl_name = CTL_AUTO,
-+ .procname = "cca_thresh",
-+ .mode = 0644,
-+ .proc_handler = ath_sysctl_halparam,
-+ .extra2 = (void *)ATH_CCA_THRESH,
-+ },
- { 0 }
- };
-
---- a/ath/if_athvar.h
-+++ b/ath/if_athvar.h
-@@ -844,6 +844,7 @@ struct ath_softc {
- int sc_cal_interval; /* current calibration interval */
- struct timer_list sc_cal_ch; /* calibration timer */
- HAL_NODE_STATS sc_halstats; /* station-mode rssi stats */
-+ int sc_cca_thresh; /* configured CCA threshold */
-
- struct ctl_table_header *sc_sysctl_header;
- struct ctl_table *sc_sysctls;
---- a/ath/ath_wprobe.c
-+++ b/ath/ath_wprobe.c
-@@ -133,8 +133,7 @@ ath_wprobe_sync(struct wprobe_iface *dev
- rx = READ_CLR(ah, AR5K_RXFC);
- tx = READ_CLR(ah, AR5K_TXFC);
- OS_REG_WRITE(ah, AR5K_MIBC, 0);
-- noise = ath_hal_get_channel_noise(sc->sc_ah, &(sc->sc_curchan));
-- ic->ic_channoise = noise;
-+ noise = ath_hw_read_nf(sc);
-
- WPROBE_FILL_BEGIN(val, ath_wprobe_globals);
- if (cc & 0xf0000000) {
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