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-rw-r--r--package/madwifi/patches/454-cca.patch186
1 files changed, 186 insertions, 0 deletions
diff --git a/package/madwifi/patches/454-cca.patch b/package/madwifi/patches/454-cca.patch
new file mode 100644
index 0000000000..53792cc8fa
--- /dev/null
+++ b/package/madwifi/patches/454-cca.patch
@@ -0,0 +1,186 @@
+--- 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) {