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ath9k: improve precision of beacon timer calculations 

SVN-Revision: 26248
owl
Felix Fietkau 2011-03-21 02:22:17 +00:00
parent c12de7c4c1
commit 4838baefa7
1 changed files with 317 additions and 0 deletions
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317
package/mac80211/patches/561-ath9k_fix_staggered_beacons.patch Normal file
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@ -0,0 +1,317 @@
--- a/drivers/net/wireless/ath/ath9k/beacon.c
+++ b/drivers/net/wireless/ath/ath9k/beacon.c
@@ -57,8 +57,8 @@ int ath_beaconq_config(struct ath_softc
/*
* Associates the beacon frame buffer with a transmit descriptor. Will set
- * up all required antenna switch parameters, rate codes, and channel flags.
- * Beacons are always sent out at the lowest rate, and are not retried.
+ * up rate codes, and channel flags. Beacons are always sent out at the
+ * lowest rate, and are not retried.
*/
static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
struct ath_buf *bf, int rateidx)
@@ -68,7 +68,7 @@ static void ath_beacon_setup(struct ath_
struct ath_common *common = ath9k_hw_common(ah);
struct ath_desc *ds;
struct ath9k_11n_rate_series series[4];
- int flags, antenna, ctsrate = 0, ctsduration = 0;
+ int flags, ctsrate = 0, ctsduration = 0;
struct ieee80211_supported_band *sband;
u8 rate = 0;
@@ -76,12 +76,6 @@ static void ath_beacon_setup(struct ath_
flags = ATH9K_TXDESC_NOACK;
ds->ds_link = 0;
- /*
- * Switch antenna every beacon.
- * Should only switch every beacon period, not for every SWBA
- * XXX assumes two antennae
- */
- antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
sband = &sc->sbands[common->hw->conf.channel->band];
rate = sband->bitrates[rateidx].hw_value;
@@ -278,7 +272,7 @@ int ath_beacon_alloc(struct ath_softc *s
return -ENOMEM;
tstamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
- sc->beacon.bc_tstamp = le64_to_cpu(tstamp);
+ sc->beacon.bc_tstamp = (u32) le64_to_cpu(tstamp);
/* Calculate a TSF adjustment factor required for staggered beacons. */
if (avp->av_bslot > 0) {
u64 tsfadjust;
@@ -294,8 +288,8 @@ int ath_beacon_alloc(struct ath_softc *s
* adjustment. Other slots are adjusted to get the timestamp
* close to the TBTT for the BSS.
*/
- tsfadjust = intval * avp->av_bslot / ATH_BCBUF;
- avp->tsf_adjust = cpu_to_le64(TU_TO_USEC(tsfadjust));
+ tsfadjust = TU_TO_USEC(intval * avp->av_bslot) / ATH_BCBUF;
+ avp->tsf_adjust = cpu_to_le64(tsfadjust);
ath_dbg(common, ATH_DBG_BEACON,
"stagger beacons, bslot %d intval %u tsfadjust %llu\n",
@@ -401,8 +395,9 @@ void ath_beacon_tasklet(unsigned long da
intval = cur_conf->beacon_interval ? : ATH_DEFAULT_BINTVAL;
tsf = ath9k_hw_gettsf64(ah);
- tsftu = TSF_TO_TU(tsf>>32, tsf);
- slot = ((tsftu % intval) * ATH_BCBUF) / intval;
+ tsf += TU_TO_USEC(ah->config.sw_beacon_response_time);
+ tsftu = TSF_TO_TU((tsf * ATH_BCBUF) >>32, tsf * ATH_BCBUF);
+ slot = (tsftu % (intval * ATH_BCBUF)) / intval;
/*
* Reverse the slot order to get slot 0 on the TBTT offset that does
* not require TSF adjustment and other slots adding
@@ -415,7 +410,7 @@ void ath_beacon_tasklet(unsigned long da
ath_dbg(common, ATH_DBG_BEACON,
"slot %d [tsf %llu tsftu %u intval %u] vif %p\n",
- slot, tsf, tsftu, intval, vif);
+ slot, tsf, tsftu / ATH_BCBUF, intval, vif);
bfaddr = 0;
if (vif) {
@@ -463,13 +458,17 @@ static void ath9k_beacon_init(struct ath
u32 next_beacon,
u32 beacon_period)
{
- if (beacon_period & ATH9K_BEACON_RESET_TSF)
+ if (sc->sc_flags & SC_OP_TSF_RESET) {
ath9k_ps_wakeup(sc);
+ ath9k_hw_reset_tsf(sc->sc_ah);
+ }
ath9k_hw_beaconinit(sc->sc_ah, next_beacon, beacon_period);
- if (beacon_period & ATH9K_BEACON_RESET_TSF)
+ if (sc->sc_flags & SC_OP_TSF_RESET) {
ath9k_ps_restore(sc);
+ sc->sc_flags &= ~SC_OP_TSF_RESET;
+ }
}
/*
@@ -484,18 +483,14 @@ static void ath_beacon_config_ap(struct
u32 nexttbtt, intval;
/* NB: the beacon interval is kept internally in TU's */
- intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
+ intval = TU_TO_USEC(conf->beacon_interval & ATH9K_BEACON_PERIOD);
intval /= ATH_BCBUF; /* for staggered beacons */
nexttbtt = intval;
- if (sc->sc_flags & SC_OP_TSF_RESET)
- intval |= ATH9K_BEACON_RESET_TSF;
-
/*
* In AP mode we enable the beacon timers and SWBA interrupts to
* prepare beacon frames.
*/
- intval |= ATH9K_BEACON_ENA;
ah->imask |= ATH9K_INT_SWBA;
ath_beaconq_config(sc);
@@ -505,11 +500,6 @@ static void ath_beacon_config_ap(struct
ath9k_beacon_init(sc, nexttbtt, intval);
sc->beacon.bmisscnt = 0;
ath9k_hw_set_interrupts(ah, ah->imask);
-
- /* Clear the reset TSF flag, so that subsequent beacon updation
- will not reset the HW TSF. */
-
- sc->sc_flags &= ~SC_OP_TSF_RESET;
}
/*
@@ -643,25 +633,20 @@ static void ath_beacon_config_adhoc(stru
{
struct ath_hw *ah = sc->sc_ah;
struct ath_common *common = ath9k_hw_common(ah);
- u64 tsf;
- u32 tsftu, intval, nexttbtt;
-
- intval = conf->beacon_interval & ATH9K_BEACON_PERIOD;
-
+ u32 tsf, delta, intval, nexttbtt;
- /* Pull nexttbtt forward to reflect the current TSF */
+ tsf = ath9k_hw_gettsf32(ah) + TU_TO_USEC(FUDGE);
+ intval = TU_TO_USEC(conf->beacon_interval & ATH9K_BEACON_PERIOD);
- nexttbtt = TSF_TO_TU(sc->beacon.bc_tstamp >> 32, sc->beacon.bc_tstamp);
- if (nexttbtt == 0)
- nexttbtt = intval;
- else if (intval)
- nexttbtt = roundup(nexttbtt, intval);
-
- tsf = ath9k_hw_gettsf64(ah);
- tsftu = TSF_TO_TU((u32)(tsf>>32), (u32)tsf) + FUDGE;
- do {
- nexttbtt += intval;
- } while (nexttbtt < tsftu);
+ if (!sc->beacon.bc_tstamp)
+ nexttbtt = tsf + intval;
+ else {
+ if (tsf > sc->beacon.bc_tstamp)
+ delta = (tsf - sc->beacon.bc_tstamp);
+ else
+ delta = (tsf + 1 + (~0U - sc->beacon.bc_tstamp));
+ nexttbtt = tsf + roundup(delta, intval);
+ }
ath_dbg(common, ATH_DBG_BEACON,
"IBSS nexttbtt %u intval %u (%u)\n",
@@ -672,7 +657,6 @@ static void ath_beacon_config_adhoc(stru
* if we need to manually prepare beacon frames. Otherwise we use a
* self-linked tx descriptor and let the hardware deal with things.
*/
- intval |= ATH9K_BEACON_ENA;
ah->imask |= ATH9K_INT_SWBA;
ath_beaconq_config(sc);
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1706,21 +1706,15 @@ void ath9k_hw_beaconinit(struct ath_hw *
case NL80211_IFTYPE_MESH_POINT:
REG_SET_BIT(ah, AR_TXCFG,
AR_TXCFG_ADHOC_BEACON_ATIM_TX_POLICY);
- REG_WRITE(ah, AR_NEXT_NDP_TIMER,
- TU_TO_USEC(next_beacon +
- (ah->atim_window ? ah->
- atim_window : 1)));
+ REG_WRITE(ah, AR_NEXT_NDP_TIMER, next_beacon +
+ TU_TO_USEC(ah->atim_window ? ah->atim_window : 1));
flags |= AR_NDP_TIMER_EN;
case NL80211_IFTYPE_AP:
- REG_WRITE(ah, AR_NEXT_TBTT_TIMER, TU_TO_USEC(next_beacon));
- REG_WRITE(ah, AR_NEXT_DMA_BEACON_ALERT,
- TU_TO_USEC(next_beacon -
- ah->config.
- dma_beacon_response_time));
- REG_WRITE(ah, AR_NEXT_SWBA,
- TU_TO_USEC(next_beacon -
- ah->config.
- sw_beacon_response_time));
+ REG_WRITE(ah, AR_NEXT_TBTT_TIMER, next_beacon);
+ REG_WRITE(ah, AR_NEXT_DMA_BEACON_ALERT, next_beacon -
+ TU_TO_USEC(ah->config.dma_beacon_response_time));
+ REG_WRITE(ah, AR_NEXT_SWBA, next_beacon -
+ TU_TO_USEC(ah->config.sw_beacon_response_time));
flags |=
AR_TBTT_TIMER_EN | AR_DBA_TIMER_EN | AR_SWBA_TIMER_EN;
break;
@@ -1732,18 +1726,13 @@ void ath9k_hw_beaconinit(struct ath_hw *
break;
}
- REG_WRITE(ah, AR_BEACON_PERIOD, TU_TO_USEC(beacon_period));
- REG_WRITE(ah, AR_DMA_BEACON_PERIOD, TU_TO_USEC(beacon_period));
- REG_WRITE(ah, AR_SWBA_PERIOD, TU_TO_USEC(beacon_period));
- REG_WRITE(ah, AR_NDP_PERIOD, TU_TO_USEC(beacon_period));
+ REG_WRITE(ah, AR_BEACON_PERIOD, beacon_period);
+ REG_WRITE(ah, AR_DMA_BEACON_PERIOD, beacon_period);
+ REG_WRITE(ah, AR_SWBA_PERIOD, beacon_period);
+ REG_WRITE(ah, AR_NDP_PERIOD, beacon_period);
REGWRITE_BUFFER_FLUSH(ah);
- beacon_period &= ~ATH9K_BEACON_ENA;
- if (beacon_period & ATH9K_BEACON_RESET_TSF) {
- ath9k_hw_reset_tsf(ah);
- }
-
REG_SET_BIT(ah, AR_TIMER_MODE, flags);
}
EXPORT_SYMBOL(ath9k_hw_beaconinit);
@@ -2404,10 +2393,11 @@ static u32 rightmost_index(struct ath_ge
return timer_table->gen_timer_index[b];
}
-static u32 ath9k_hw_gettsf32(struct ath_hw *ah)
+u32 ath9k_hw_gettsf32(struct ath_hw *ah)
{
return REG_READ(ah, AR_TSF_L32);
}
+EXPORT_SYMBOL(ath9k_hw_gettsf32);
struct ath_gen_timer *ath_gen_timer_alloc(struct ath_hw *ah,
void (*trigger)(void *),
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -392,7 +392,7 @@ struct ath_beacon {
u32 beaconq;
u32 bmisscnt;
u32 ast_be_xmit;
- u64 bc_tstamp;
+ u32 bc_tstamp;
struct ieee80211_vif *bslot[ATH_BCBUF];
int slottime;
int slotupdate;
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -412,8 +412,6 @@ struct ath9k_beacon_state {
u32 bs_nextdtim;
u32 bs_intval;
#define ATH9K_BEACON_PERIOD 0x0000ffff
-#define ATH9K_BEACON_ENA 0x00800000
-#define ATH9K_BEACON_RESET_TSF 0x01000000
#define ATH9K_TSFOOR_THRESHOLD 0x00004240 /* 16k us */
u32 bs_dtimperiod;
u16 bs_cfpperiod;
@@ -927,6 +925,7 @@ void ath9k_hw_setopmode(struct ath_hw *a
void ath9k_hw_setmcastfilter(struct ath_hw *ah, u32 filter0, u32 filter1);
void ath9k_hw_setbssidmask(struct ath_hw *ah);
void ath9k_hw_write_associd(struct ath_hw *ah);
+u32 ath9k_hw_gettsf32(struct ath_hw *ah);
u64 ath9k_hw_gettsf64(struct ath_hw *ah);
void ath9k_hw_settsf64(struct ath_hw *ah, u64 tsf64);
void ath9k_hw_reset_tsf(struct ath_hw *ah);
--- a/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_beacon.c
@@ -155,7 +155,7 @@ static void ath9k_htc_beacon_config_ap(s
nexttbtt = intval;
if (priv->op_flags & OP_TSF_RESET) {
- intval |= ATH9K_BEACON_RESET_TSF;
+ ath9k_hw_reset_tsf(priv->ah);
priv->op_flags &= ~OP_TSF_RESET;
} else {
/*
@@ -168,8 +168,6 @@ static void ath9k_htc_beacon_config_ap(s
} while (nexttbtt < tsftu);
}
- intval |= ATH9K_BEACON_ENA;
-
if (priv->op_flags & OP_ENABLE_BEACON)
imask |= ATH9K_INT_SWBA;
@@ -178,7 +176,7 @@ static void ath9k_htc_beacon_config_ap(s
bss_conf->beacon_interval, nexttbtt, imask);
WMI_CMD(WMI_DISABLE_INTR_CMDID);
- ath9k_hw_beaconinit(priv->ah, nexttbtt, intval);
+ ath9k_hw_beaconinit(priv->ah, TU_TO_USEC(nexttbtt), TU_TO_USEC(intval));
priv->bmiss_cnt = 0;
htc_imask = cpu_to_be32(imask);
WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);
@@ -207,7 +205,6 @@ static void ath9k_htc_beacon_config_adho
nexttbtt += intval;
} while (nexttbtt < tsftu);
- intval |= ATH9K_BEACON_ENA;
if (priv->op_flags & OP_ENABLE_BEACON)
imask |= ATH9K_INT_SWBA;
@@ -216,7 +213,7 @@ static void ath9k_htc_beacon_config_adho
bss_conf->beacon_interval, nexttbtt, imask);
WMI_CMD(WMI_DISABLE_INTR_CMDID);
- ath9k_hw_beaconinit(priv->ah, nexttbtt, intval);
+ ath9k_hw_beaconinit(priv->ah, TU_TO_USEC(nexttbtt), TU_TO_USEC(intval));
priv->bmiss_cnt = 0;
htc_imask = cpu_to_be32(imask);
WMI_CMD_BUF(WMI_ENABLE_INTR_CMDID, &htc_imask);