ath9k: Handle TSF properly for AP mode
The TSF has to be reset only once, upon bringing
the interface up in AP mode. For any beacon reconfigure calls
after that, resetting the TSF results in incorrect beacon generation.
The only exception is a change in the beacon interval,
which is indicated to the driver by mac80211 through
IEEE80211_CONF_CHANGE_BEACON_INTERVAL, handle this properly.
Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/ath9k.h b/drivers/net/wireless/ath9k/ath9k.h
index 0769a25..4c1da71 100644
--- a/drivers/net/wireless/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath9k/ath9k.h
@@ -542,22 +542,23 @@
#define ATH_RSSI_DUMMY_MARKER 0x127
#define ATH_RATE_DUMMY_MARKER 0
-#define SC_OP_INVALID BIT(0)
-#define SC_OP_BEACONS BIT(1)
-#define SC_OP_RXAGGR BIT(2)
-#define SC_OP_TXAGGR BIT(3)
-#define SC_OP_CHAINMASK_UPDATE BIT(4)
-#define SC_OP_FULL_RESET BIT(5)
-#define SC_OP_PREAMBLE_SHORT BIT(6)
-#define SC_OP_PROTECT_ENABLE BIT(7)
-#define SC_OP_RXFLUSH BIT(8)
-#define SC_OP_LED_ASSOCIATED BIT(9)
-#define SC_OP_RFKILL_REGISTERED BIT(10)
-#define SC_OP_RFKILL_SW_BLOCKED BIT(11)
-#define SC_OP_RFKILL_HW_BLOCKED BIT(12)
-#define SC_OP_WAIT_FOR_BEACON BIT(13)
-#define SC_OP_LED_ON BIT(14)
-#define SC_OP_SCANNING BIT(15)
+#define SC_OP_INVALID BIT(0)
+#define SC_OP_BEACONS BIT(1)
+#define SC_OP_RXAGGR BIT(2)
+#define SC_OP_TXAGGR BIT(3)
+#define SC_OP_CHAINMASK_UPDATE BIT(4)
+#define SC_OP_FULL_RESET BIT(5)
+#define SC_OP_PREAMBLE_SHORT BIT(6)
+#define SC_OP_PROTECT_ENABLE BIT(7)
+#define SC_OP_RXFLUSH BIT(8)
+#define SC_OP_LED_ASSOCIATED BIT(9)
+#define SC_OP_RFKILL_REGISTERED BIT(10)
+#define SC_OP_RFKILL_SW_BLOCKED BIT(11)
+#define SC_OP_RFKILL_HW_BLOCKED BIT(12)
+#define SC_OP_WAIT_FOR_BEACON BIT(13)
+#define SC_OP_LED_ON BIT(14)
+#define SC_OP_SCANNING BIT(15)
+#define SC_OP_TSF_RESET BIT(16)
struct ath_bus_ops {
void (*read_cachesize)(struct ath_softc *sc, int *csz);
diff --git a/drivers/net/wireless/ath9k/beacon.c b/drivers/net/wireless/ath9k/beacon.c
index 7491643..d136572 100644
--- a/drivers/net/wireless/ath9k/beacon.c
+++ b/drivers/net/wireless/ath9k/beacon.c
@@ -510,6 +510,11 @@
{
u32 nexttbtt, intval;
+ /* Configure the timers only when the TSF has to be reset */
+
+ if (!(sc->sc_flags & SC_OP_TSF_RESET))
+ return;
+
/* NB: the beacon interval is kept internally in TU's */
intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
intval /= ATH_BCBUF; /* for staggered beacons */
@@ -530,6 +535,11 @@
ath9k_hw_beaconinit(sc->sc_ah, nexttbtt, intval);
sc->beacon.bmisscnt = 0;
ath9k_hw_set_interrupts(sc->sc_ah, sc->imask);
+
+ /* Clear the reset TSF flag, so that subsequent beacon updation
+ will not reset the HW TSF. */
+
+ sc->sc_flags &= ~SC_OP_TSF_RESET;
}
/*
diff --git a/drivers/net/wireless/ath9k/main.c b/drivers/net/wireless/ath9k/main.c
index 9e8f954..a25dcf9 100644
--- a/drivers/net/wireless/ath9k/main.c
+++ b/drivers/net/wireless/ath9k/main.c
@@ -2168,8 +2168,10 @@
avp->av_opmode = ic_opmode;
avp->av_bslot = -1;
- if (ic_opmode == NL80211_IFTYPE_AP)
+ if (ic_opmode == NL80211_IFTYPE_AP) {
ath9k_hw_set_tsfadjust(sc->sc_ah, 1);
+ sc->sc_flags |= SC_OP_TSF_RESET;
+ }
sc->vifs[0] = conf->vif;
sc->nvifs++;
@@ -2291,6 +2293,16 @@
if (changed & IEEE80211_CONF_CHANGE_POWER)
sc->config.txpowlimit = 2 * conf->power_level;
+ /*
+ * The HW TSF has to be reset when the beacon interval changes.
+ * We set the flag here, and ath_beacon_config_ap() would take this
+ * into account when it gets called through the subsequent
+ * config_interface() call - with IFCC_BEACON in the changed field.
+ */
+
+ if (changed & IEEE80211_CONF_CHANGE_BEACON_INTERVAL)
+ sc->sc_flags |= SC_OP_TSF_RESET;
+
mutex_unlock(&sc->mutex);
return 0;