diff options
Diffstat (limited to 'package/kernel/mac80211/patches/312-ath9k-Correct-TSF-adjustment-to-align-the-beacon-tim.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/312-ath9k-Correct-TSF-adjustment-to-align-the-beacon-tim.patch | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/312-ath9k-Correct-TSF-adjustment-to-align-the-beacon-tim.patch b/package/kernel/mac80211/patches/312-ath9k-Correct-TSF-adjustment-to-align-the-beacon-tim.patch new file mode 100644 index 0000000000..df43105cb8 --- /dev/null +++ b/package/kernel/mac80211/patches/312-ath9k-Correct-TSF-adjustment-to-align-the-beacon-tim.patch @@ -0,0 +1,45 @@ +From: Benjamin Berg <benjamin.berg@open-mesh.com> +Date: Mon, 4 Jul 2016 14:37:20 +0200 +Subject: [PATCH] ath9k: Correct TSF adjustment to align the beacon time + correctly + +Beacons were not send out at (timestamp % beacon_time == 0) for interfaces +other than the primary one. To send out beacons with the correct timestamp +according to 10.1.3.2 of the 802.11 standard the tsf_adjustment has to be +set to the negative time difference instead of positive. This way the +later beacons get corrected to have a lower (and similar) timestamp with +regard to the beacon from slot 0. + +I am not aware about any issues that have been caused by this. + +Signed-off-by: Benjamin Berg <benjamin.berg@open-mesh.com> +--- + +--- a/drivers/net/wireless/ath/ath9k/beacon.c ++++ b/drivers/net/wireless/ath/ath9k/beacon.c +@@ -279,17 +279,21 @@ static void ath9k_set_tsfadjust(struct a + struct ath_common *common = ath9k_hw_common(sc->sc_ah); + struct ath_vif *avp = (void *)vif->drv_priv; + struct ath_beacon_config *cur_conf = &avp->chanctx->beacon; +- u32 tsfadjust; ++ s64 tsfadjust; + + if (avp->av_bslot == 0) + return; + ++ /* tsf_adjust is added to the TSF value. We send out the beacon late, ++ * so need to adjust the TSF starting point to be later in time (i.e. ++ * the theoretical first beacon has a TSF of 0 after correction). ++ */ + tsfadjust = cur_conf->beacon_interval * avp->av_bslot; +- tsfadjust = TU_TO_USEC(tsfadjust) / ATH_BCBUF; ++ tsfadjust = -TU_TO_USEC(tsfadjust) / ATH_BCBUF; + avp->tsf_adjust = cpu_to_le64(tsfadjust); + +- ath_dbg(common, CONFIG, "tsfadjust is: %llu for bslot: %d\n", +- (unsigned long long)tsfadjust, avp->av_bslot); ++ ath_dbg(common, CONFIG, "tsfadjust is: %lld for bslot: %d\n", ++ (signed long long)tsfadjust, avp->av_bslot); + } + + bool ath9k_csa_is_finished(struct ath_softc *sc, struct ieee80211_vif *vif) |