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--- a/ath/if_ath.c
+++ b/ath/if_ath.c
@@ -161,6 +161,7 @@
static void ath_beacon_return(struct ath_softc *, struct ath_buf *);
static void ath_beacon_free(struct ath_softc *);
static void ath_beacon_config(struct ath_softc *, struct ieee80211vap *);
+static void ath_hw_beacon_stop(struct ath_softc *sc);
static int ath_desc_alloc(struct ath_softc *);
static void ath_desc_free(struct ath_softc *);
static void ath_desc_swap(struct ath_desc *);
@@ -2783,6 +2784,72 @@
return 1;
}
+static void
+ath_hw_beacon_stop(struct ath_softc *sc)
+{
+ HAL_BEACON_TIMERS btimers;
+
+ btimers.bt_intval = 0;
+ btimers.bt_nexttbtt = 0;
+ btimers.bt_nextdba = 0xffffffff;
+ btimers.bt_nextswba = 0xffffffff;
+ btimers.bt_nextatim = 0;
+
+ ath_hal_setbeacontimers(sc->sc_ah, &btimers);
+}
+
+/* Fix up the ATIM window after TSF resync */
+static int
+ath_hw_check_atim(struct ath_softc *sc, int window, int intval)
+{
+#define AR5K_TIMER0_5210 0x802c /* Next beacon time register */
+#define AR5K_TIMER0_5211 0x8028
+#define AR5K_TIMER3_5210 0x8038 /* End of ATIM window time register */
+#define AR5K_TIMER3_5211 0x8034
+ struct ath_hal *ah = sc->sc_ah;
+ int dev = sc->sc_ah->ah_macType;
+ unsigned int nbtt, atim;
+ bool is_5210 = false;
+
+ /*
+ * check if the ATIM window is still correct:
+ * 1.) usually ATIM should be NBTT + window
+ * 2.) nbtt already updated
+ * 3.) nbtt already updated and has wrapped around
+ * 4.) atim has wrapped around
+ */
+ switch(dev) {
+ case 5210:
+ nbtt = OS_REG_READ(ah, AR5K_TIMER0_5210);
+ atim = OS_REG_READ(ah, AR5K_TIMER3_5210);
+ is_5210 = true;
+ break;
+ case 5211:
+ case 5212:
+ nbtt = OS_REG_READ(ah, AR5K_TIMER0_5211);
+ atim = OS_REG_READ(ah, AR5K_TIMER3_5211);
+ break;
+ /* NB: 5416+ doesn't do ATIM in hw */
+ case 5416:
+ default:
+ return 0;
+ }
+
+ if ((atim - nbtt != window) && /* 1.) */
+ (nbtt - atim != intval - window) && /* 2.) */
+ ((nbtt | 0x10000) - atim != intval - window) && /* 3.) */
+ ((atim | 0x10000) - nbtt != window)) { /* 4.) */
+ if (is_5210)
+ OS_REG_WRITE(ah, AR5K_TIMER3_5210, nbtt + window );
+ else
+ OS_REG_WRITE(ah, AR5K_TIMER3_5211, nbtt + window );
+ return atim - nbtt;
+ }
+
+ return 0;
+}
+
+
/*
* Reset the hardware w/o losing operational state. This is
* basically a more efficient way of doing ath_stop, ath_init,
@@ -5282,6 +5349,7 @@
u_int64_t tsf, hw_tsf;
u_int32_t tsftu, hw_tsftu;
u_int32_t intval, nexttbtt = 0;
+ unsigned long flags;
int reset_tsf = 0;
if (vap == NULL)
@@ -5289,6 +5357,9 @@
ni = vap->iv_bss;
+ /* TSF calculation is timing critical - we don't want to be interrupted here */
+ local_irq_save(flags);
+
hw_tsf = ath_hal_gettsf64(ah);
tsf = le64_to_cpu(ni->ni_tstamp.tsf);
hw_tsftu = hw_tsf >> 10;
@@ -5478,15 +5549,27 @@
<= ath_hal_sw_beacon_response_time)
nexttbtt += intval;
sc->sc_nexttbtt = nexttbtt;
+
+ /* stop beacons before reconfiguring the timers to avoid race
+ * conditions. ath_hal_beaconinit will start them again */
+ ath_hw_beacon_stop(sc);
+
ath_hal_beaconinit(ah, nexttbtt, intval);
if (intval & HAL_BEACON_RESET_TSF) {
sc->sc_last_tsf = 0;
}
sc->sc_bmisscount = 0;
ath_hal_intrset(ah, sc->sc_imask);
+
+ if (ath_hw_check_atim(sc, 1, intval & HAL_BEACON_PERIOD)) {
+ DPRINTF(sc, ATH_DEBUG_BEACON,
+ "fixed atim window after beacon init\n");
+ }
}
ath_beacon_config_debug:
+ local_irq_restore(flags);
+
/* We print all debug messages here, in order to preserve the
* time critical aspect of this function */
DPRINTF(sc, ATH_DEBUG_BEACON,
@@ -6389,6 +6472,11 @@
DPRINTF(sc, ATH_DEBUG_BEACON,
"Updated beacon timers\n");
}
+ if ((sc->sc_opmode == IEEE80211_M_IBSS) &&
+ IEEE80211_ADDR_EQ(ni->ni_bssid, vap->iv_bss->ni_bssid) &&
+ ath_hw_check_atim(sc, 1, vap->iv_bss->ni_intval)) {
+ DPRINTF(sc, ATH_DEBUG_ANY, "Fixed ATIM window after beacon recv\n");
+ }
/* NB: Fall Through */
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
if (vap->iv_opmode == IEEE80211_M_IBSS &&
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