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@@ -0,0 +1,119 @@
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+--- a/ath/if_ath.c
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++++ b/ath/if_ath.c
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+@@ -384,6 +384,7 @@ static u_int32_t ath_get_real_maxtxpower
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+
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+ static void ath_poll_disable(struct net_device *dev);
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+ static void ath_poll_enable(struct net_device *dev);
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++static void ath_fetch_idle_time(struct ath_softc *sc);
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+
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+ /* calibrate every 30 secs in steady state but check every second at first. */
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+ static int ath_calinterval = ATH_SHORT_CALINTERVAL;
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+@@ -2579,6 +2580,7 @@ ath_init(struct net_device *dev)
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+ * be followed by initialization of the appropriate bits
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+ * and then setup of the interrupt mask.
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+ */
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++ ath_fetch_idle_time(sc);
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+ sc->sc_curchan.channel = ic->ic_curchan->ic_freq;
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+ sc->sc_curchan.channelFlags = ath_chan2flags(ic->ic_curchan);
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+ if (!ath_hal_reset(ah, sc->sc_opmode, &sc->sc_curchan, AH_FALSE, &status)) {
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+@@ -2913,6 +2915,34 @@ ath_hw_check_atim(struct ath_softc *sc,
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+ }
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+
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+
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++#define AR5K_RXCLEAR 0x80f4
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++#define AR5K_CYCLES 0x80f8
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++static void
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++ath_fetch_idle_time(struct ath_softc *sc)
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++{
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++ struct ieee80211com *ic = &sc->sc_ic;
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++ struct ath_hal *ah = sc->sc_ah;
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++ u_int32_t cc, rx;
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++ u_int32_t time = 0;
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++
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++ if (sc->sc_ah->ah_macType < 5212)
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++ return;
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++
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++ rx = OS_REG_READ(ah, AR5K_RXCLEAR);
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++ cc = OS_REG_READ(ah, AR5K_CYCLES);
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++ if (rx > cc)
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++ return; /* wraparound */
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++
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++ if (sc->sc_last_chan)
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++ sc->sc_last_chan->ic_idletime = 100 * (cc - rx) / cc;
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++ sc->sc_last_chan = ic->ic_curchan;
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++
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++ OS_REG_WRITE(ah, AR5K_RXCLEAR, 0);
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++ OS_REG_WRITE(ah, AR5K_CYCLES, 0);
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++}
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++#undef AR5K_RXCLEAR
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++#undef AR5K_CYCLES
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++
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+ /*
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+ * Reset the hardware w/o losing operational state. This is
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+ * basically a more efficient way of doing ath_stop, ath_init,
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+@@ -2939,6 +2969,7 @@ ath_reset(struct net_device *dev)
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+ * Convert to a HAL channel description with the flags
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+ * constrained to reflect the current operating mode.
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+ */
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++ ath_fetch_idle_time(sc);
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+ c = ic->ic_curchan;
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+ sc->sc_curchan.channel = c->ic_freq;
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+ sc->sc_curchan.channelFlags = ath_chan2flags(c);
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+@@ -9019,6 +9050,7 @@ ath_chan_set(struct ath_softc *sc, struc
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+ u_int8_t channel_change_required = 0;
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+ struct timeval tv;
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+
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++ ath_fetch_idle_time(sc);
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+ /*
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+ * Convert to a HAL channel description with
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+ * the flags constrained to reflect the current
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+--- a/ath/if_athvar.h
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++++ b/ath/if_athvar.h
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+@@ -773,6 +773,7 @@ struct ath_softc {
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+ struct ieee80211vap **sc_bslot; /* beacon xmit slots */
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+ int sc_bnext; /* next slot for beacon xmit */
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+
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++ struct ieee80211_channel *sc_last_chan;
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+ int sc_beacon_cal; /* use beacon timer for calibration */
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+ u_int64_t sc_lastcal; /* last time the calibration was performed */
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+ struct timer_list sc_cal_ch; /* calibration timer */
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+--- a/net80211/_ieee80211.h
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++++ b/net80211/_ieee80211.h
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+@@ -148,6 +148,7 @@ struct ieee80211_channel {
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+ int8_t ic_maxpower; /* maximum tx power in dBm */
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+ int8_t ic_minpower; /* minimum tx power in dBm */
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+ u_int8_t ic_scanflags;
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++ u_int8_t ic_idletime; /* phy idle time in % */
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+ };
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+
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+ #define IEEE80211_CHAN_MAX 255
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+--- a/net80211/ieee80211_scan_ap.c
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++++ b/net80211/ieee80211_scan_ap.c
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+@@ -423,6 +423,19 @@ pc_cmp_rssi(struct ap_state *as, struct
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+
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+ /* This function must be invoked with locks acquired */
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+ static int
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++pc_cmp_idletime(struct ieee80211_channel *a,
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++ struct ieee80211_channel *b)
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++{
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++ if (!a->ic_idletime || !b->ic_idletime)
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++ return 0;
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++
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++ /* a is better than b (return < 0) when a has more idle time than b */
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++ return b->ic_idletime - a->ic_idletime;
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++}
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++
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++
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++/* This function must be invoked with locks acquired */
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++static int
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+ pc_cmp_samechan(struct ieee80211com *ic, struct ieee80211_channel *a,
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+ struct ieee80211_channel *b)
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+ {
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+@@ -455,6 +468,7 @@ pc_cmp(const void *_a, const void *_b)
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+ return res; \
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+ } while (0)
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+
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++ EVALUATE_CRITERION(idletime, a, b);
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+ EVALUATE_CRITERION(radar, a, b);
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+ EVALUATE_CRITERION(keepmode, params, a, b);
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+ EVALUATE_CRITERION(sc, ic, a, b);
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Felix Fietkau