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ath9k: Update Beacon timers based on timestamp from the AP 

Some APs seem to drift away from the expected TBTT (timestamp %
beacon_int_in_usec differs quite a bit from zero) which can result in
us waking up way too early to receive a Beacon frame. In order to work
around this, re-configure the Beacon timers after having received a
Beacon frame from the AP (i.e., when we know the offset between the
expected TBTT and the actual time the AP is sending out the Beacon
frame).

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2009-05-20 21:59:08 +03:00 committed by John W. Linville
parent 267a901274
commit ccdfeab653
3 changed files with 16 additions and 1 deletions
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1
drivers/net/wireless/ath/ath9k/ath9k.h
View File

@ -518,6 +518,7 @@ struct ath_rfkill {
#define SC_OP_WAIT_FOR_CAB BIT(16)
#define SC_OP_WAIT_FOR_PSPOLL_DATA BIT(17)
#define SC_OP_WAIT_FOR_TX_ACK BIT(18)
#define SC_OP_BEACON_SYNC BIT(19)
struct ath_bus_ops {
void (*read_cachesize)(struct ath_softc *sc, int *csz);

9
drivers/net/wireless/ath/ath9k/main.c
View File

@ -487,7 +487,7 @@ static void ath9k_tasklet(unsigned long data)
* the next Beacon.
*/
DPRINTF(sc, ATH_DBG_PS, "TSFOOR - Sync with next Beacon\n");
sc->sc_flags |= SC_OP_WAIT_FOR_BEACON;
sc->sc_flags |= SC_OP_WAIT_FOR_BEACON | SC_OP_BEACON_SYNC;
}
/* re-enable hardware interrupt */
@ -914,6 +914,13 @@ static void ath9k_bss_assoc_info(struct ath_softc *sc,
if (avp->av_opmode == NL80211_IFTYPE_STATION) {
sc->curaid = bss_conf->aid;
ath9k_hw_write_associd(sc);
/*
* Request a re-configuration of Beacon related timers
* on the receipt of the first Beacon frame (i.e.,
* after time sync with the AP).
*/
sc->sc_flags |= SC_OP_BEACON_SYNC;
}
/* Configure the beacon */

7
drivers/net/wireless/ath/ath9k/recv.c
View File

@ -521,6 +521,13 @@ static void ath_rx_ps_beacon(struct ath_softc *sc, struct sk_buff *skb)
if (memcmp(sc->curbssid, mgmt->bssid, ETH_ALEN) != 0)
return; /* not from our current AP */
if (sc->sc_flags & SC_OP_BEACON_SYNC) {
sc->sc_flags &= ~SC_OP_BEACON_SYNC;
DPRINTF(sc, ATH_DBG_PS, "Reconfigure Beacon timers based on "
"timestamp from the AP\n");
ath_beacon_config(sc, NULL);
}
if (!(sc->hw->conf.flags & IEEE80211_CONF_PS)) {
/* We are not in PS mode anymore; remain awake */
DPRINTF(sc, ATH_DBG_PS, "Not in PS mode anymore, remain "