Return-path: Received: from s3.sipsolutions.net ([5.9.151.49]:45937 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932586AbcFGNKK (ORCPT ); Tue, 7 Jun 2016 09:10:10 -0400 From: Benjamin Berg To: linux-wireless@vger.kernel.org Cc: Kalle Valo , Felix Fietkau , ath9k-devel@lists.ath9k.org, Benjamin Berg Subject: [PATCH 1/6] ath9k: Correct TSF adjustment to align the beacon time correctly Date: Tue, 7 Jun 2016 15:09:56 +0200 Message-Id: <1465305001-26067-1-git-send-email-benjamin@sipsolutions.net> (sfid-20160607_151017_564891_F17347B8) Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Benjamin Berg Beacons need to be send out at timestamp % beacon_time == 0. Signed-off-by: Benjamin Berg --- drivers/net/wireless/ath/ath9k/beacon.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/beacon.c b/drivers/net/wireless/ath/ath9k/beacon.c index 5cf0cd7..800c96b 100644 --- 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 ath_softc *sc, struct ieee80211_vif *vif) 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) -- 2.8.1