Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1651 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/channel.c b/drivers/net/wireless/ath/ath9k/channel.c
new file mode 100644
index 000000000..fd61ae478
--- /dev/null
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -0,0 +1,1651 @@
+/*
+ * Copyright (c) 2014 Qualcomm Atheros, Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "ath9k.h"
+
+/* Set/change channels.  If the channel is really being changed, it's done
+ * by reseting the chip.  To accomplish this we must first cleanup any pending
+ * DMA, then restart stuff.
+ */
+static int ath_set_channel(struct ath_softc *sc)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ieee80211_hw *hw = sc->hw;
+	struct ath9k_channel *hchan;
+	struct cfg80211_chan_def *chandef = &sc->cur_chan->chandef;
+	struct ieee80211_channel *chan = chandef->chan;
+	int pos = chan->hw_value;
+	unsigned long flags;
+	int old_pos = -1;
+	int r;
+
+	if (test_bit(ATH_OP_INVALID, &common->op_flags))
+		return -EIO;
+
+	if (ah->curchan)
+		old_pos = ah->curchan - &ah->channels[0];
+
+	ath_dbg(common, CONFIG, "Set channel: %d MHz width: %d\n",
+		chan->center_freq, chandef->width);
+
+	/* update survey stats for the old channel before switching */
+	spin_lock_irqsave(&common->cc_lock, flags);
+	ath_update_survey_stats(sc);
+	spin_unlock_irqrestore(&common->cc_lock, flags);
+
+	ath9k_cmn_get_channel(hw, ah, chandef);
+
+	/* If the operating channel changes, change the survey in-use flags
+	 * along with it.
+	 * Reset the survey data for the new channel, unless we're switching
+	 * back to the operating channel from an off-channel operation.
+	 */
+	if (!sc->cur_chan->offchannel && sc->cur_survey != &sc->survey[pos]) {
+		if (sc->cur_survey)
+			sc->cur_survey->filled &= ~SURVEY_INFO_IN_USE;
+
+		sc->cur_survey = &sc->survey[pos];
+
+		memset(sc->cur_survey, 0, sizeof(struct survey_info));
+		sc->cur_survey->filled |= SURVEY_INFO_IN_USE;
+	} else if (!(sc->survey[pos].filled & SURVEY_INFO_IN_USE)) {
+		memset(&sc->survey[pos], 0, sizeof(struct survey_info));
+	}
+
+	hchan = &sc->sc_ah->channels[pos];
+	r = ath_reset(sc, hchan);
+	if (r)
+		return r;
+
+	/* The most recent snapshot of channel->noisefloor for the old
+	 * channel is only available after the hardware reset. Copy it to
+	 * the survey stats now.
+	 */
+	if (old_pos >= 0)
+		ath_update_survey_nf(sc, old_pos);
+
+	/* Enable radar pulse detection if on a DFS channel. Spectral
+	 * scanning and radar detection can not be used concurrently.
+	 */
+	if (hw->conf.radar_enabled) {
+		u32 rxfilter;
+
+		rxfilter = ath9k_hw_getrxfilter(ah);
+		rxfilter |= ATH9K_RX_FILTER_PHYRADAR |
+				ATH9K_RX_FILTER_PHYERR;
+		ath9k_hw_setrxfilter(ah, rxfilter);
+		ath_dbg(common, DFS, "DFS enabled at freq %d\n",
+			chan->center_freq);
+	} else {
+		/* perform spectral scan if requested. */
+		if (test_bit(ATH_OP_SCANNING, &common->op_flags) &&
+			sc->spec_priv.spectral_mode == SPECTRAL_CHANSCAN)
+			ath9k_cmn_spectral_scan_trigger(common, &sc->spec_priv);
+	}
+
+	return 0;
+}
+
+void ath_chanctx_init(struct ath_softc *sc)
+{
+	struct ath_chanctx *ctx;
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ieee80211_supported_band *sband;
+	struct ieee80211_channel *chan;
+	int i, j;
+
+	sband = &common->sbands[NL80211_BAND_2GHZ];
+	if (!sband->n_channels)
+		sband = &common->sbands[NL80211_BAND_5GHZ];
+
+	chan = &sband->channels[0];
+	for (i = 0; i < ATH9K_NUM_CHANCTX; i++) {
+		ctx = &sc->chanctx[i];
+		cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
+		INIT_LIST_HEAD(&ctx->vifs);
+		ctx->txpower = ATH_TXPOWER_MAX;
+		ctx->flush_timeout = HZ / 5; /* 200ms */
+		for (j = 0; j < ARRAY_SIZE(ctx->acq); j++) {
+			INIT_LIST_HEAD(&ctx->acq[j].acq_new);
+			INIT_LIST_HEAD(&ctx->acq[j].acq_old);
+			spin_lock_init(&ctx->acq[j].lock);
+		}
+	}
+}
+
+void ath_chanctx_set_channel(struct ath_softc *sc, struct ath_chanctx *ctx,
+			     struct cfg80211_chan_def *chandef)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	bool cur_chan;
+
+	spin_lock_bh(&sc->chan_lock);
+	if (chandef)
+		memcpy(&ctx->chandef, chandef, sizeof(*chandef));
+	cur_chan = sc->cur_chan == ctx;
+	spin_unlock_bh(&sc->chan_lock);
+
+	if (!cur_chan) {
+		ath_dbg(common, CHAN_CTX,
+			"Current context differs from the new context\n");
+		return;
+	}
+
+	ath_set_channel(sc);
+}
+
+#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
+
+/*************/
+/* Utilities */
+/*************/
+
+struct ath_chanctx* ath_is_go_chanctx_present(struct ath_softc *sc)
+{
+	struct ath_chanctx *ctx;
+	struct ath_vif *avp;
+	struct ieee80211_vif *vif;
+
+	spin_lock_bh(&sc->chan_lock);
+
+	ath_for_each_chanctx(sc, ctx) {
+		if (!ctx->active)
+			continue;
+
+		list_for_each_entry(avp, &ctx->vifs, list) {
+			vif = avp->vif;
+
+			if (ieee80211_vif_type_p2p(vif) == NL80211_IFTYPE_P2P_GO) {
+				spin_unlock_bh(&sc->chan_lock);
+				return ctx;
+			}
+		}
+	}
+
+	spin_unlock_bh(&sc->chan_lock);
+	return NULL;
+}
+
+/**********************************************************/
+/* Functions to handle the channel context state machine. */
+/**********************************************************/
+
+static const char *offchannel_state_string(enum ath_offchannel_state state)
+{
+	switch (state) {
+		case_rtn_string(ATH_OFFCHANNEL_IDLE);
+		case_rtn_string(ATH_OFFCHANNEL_PROBE_SEND);
+		case_rtn_string(ATH_OFFCHANNEL_PROBE_WAIT);
+		case_rtn_string(ATH_OFFCHANNEL_SUSPEND);
+		case_rtn_string(ATH_OFFCHANNEL_ROC_START);
+		case_rtn_string(ATH_OFFCHANNEL_ROC_WAIT);
+		case_rtn_string(ATH_OFFCHANNEL_ROC_DONE);
+	default:
+		return "unknown";
+	}
+}
+
+static const char *chanctx_event_string(enum ath_chanctx_event ev)
+{
+	switch (ev) {
+		case_rtn_string(ATH_CHANCTX_EVENT_BEACON_PREPARE);
+		case_rtn_string(ATH_CHANCTX_EVENT_BEACON_SENT);
+		case_rtn_string(ATH_CHANCTX_EVENT_TSF_TIMER);
+		case_rtn_string(ATH_CHANCTX_EVENT_BEACON_RECEIVED);
+		case_rtn_string(ATH_CHANCTX_EVENT_AUTHORIZED);
+		case_rtn_string(ATH_CHANCTX_EVENT_SWITCH);
+		case_rtn_string(ATH_CHANCTX_EVENT_ASSIGN);
+		case_rtn_string(ATH_CHANCTX_EVENT_UNASSIGN);
+		case_rtn_string(ATH_CHANCTX_EVENT_CHANGE);
+		case_rtn_string(ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
+	default:
+		return "unknown";
+	}
+}
+
+static const char *chanctx_state_string(enum ath_chanctx_state state)
+{
+	switch (state) {
+		case_rtn_string(ATH_CHANCTX_STATE_IDLE);
+		case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_BEACON);
+		case_rtn_string(ATH_CHANCTX_STATE_WAIT_FOR_TIMER);
+		case_rtn_string(ATH_CHANCTX_STATE_SWITCH);
+		case_rtn_string(ATH_CHANCTX_STATE_FORCE_ACTIVE);
+	default:
+		return "unknown";
+	}
+}
+
+static u32 chanctx_event_delta(struct ath_softc *sc)
+{
+	u64 ms;
+	struct timespec64 ts, *old;
+
+	ktime_get_raw_ts64(&ts);
+	old = &sc->last_event_time;
+	ms = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
+	ms -= old->tv_sec * 1000 + old->tv_nsec / 1000000;
+	sc->last_event_time = ts;
+
+	return (u32)ms;
+}
+
+void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_chanctx *ictx;
+	struct ath_vif *avp;
+	bool active = false;
+	u8 n_active = 0;
+
+	if (!ctx)
+		return;
+
+	if (ctx == &sc->offchannel.chan) {
+		spin_lock_bh(&sc->chan_lock);
+
+		if (likely(sc->sched.channel_switch_time))
+			ctx->flush_timeout =
+				usecs_to_jiffies(sc->sched.channel_switch_time);
+		else
+			ctx->flush_timeout =
+				msecs_to_jiffies(10);
+
+		spin_unlock_bh(&sc->chan_lock);
+
+		/*
+		 * There is no need to iterate over the
+		 * active/assigned channel contexts if
+		 * the current context is offchannel.
+		 */
+		return;
+	}
+
+	ictx = ctx;
+
+	list_for_each_entry(avp, &ctx->vifs, list) {
+		struct ieee80211_vif *vif = avp->vif;
+
+		switch (vif->type) {
+		case NL80211_IFTYPE_P2P_CLIENT:
+		case NL80211_IFTYPE_STATION:
+			if (avp->assoc)
+				active = true;
+			break;
+		default:
+			active = true;
+			break;
+		}
+	}
+	ctx->active = active;
+
+	ath_for_each_chanctx(sc, ctx) {
+		if (!ctx->assigned || list_empty(&ctx->vifs))
+			continue;
+		n_active++;
+	}
+
+	spin_lock_bh(&sc->chan_lock);
+
+	if (n_active <= 1) {
+		ictx->flush_timeout = HZ / 5;
+		clear_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags);
+		spin_unlock_bh(&sc->chan_lock);
+		return;
+	}
+
+	ictx->flush_timeout = usecs_to_jiffies(sc->sched.channel_switch_time);
+
+	if (test_and_set_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags)) {
+		spin_unlock_bh(&sc->chan_lock);
+		return;
+	}
+
+	spin_unlock_bh(&sc->chan_lock);
+
+	if (ath9k_is_chanctx_enabled()) {
+		ath_chanctx_event(sc, NULL,
+				  ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL);
+	}
+}
+
+static struct ath_chanctx *
+ath_chanctx_get_next(struct ath_softc *sc, struct ath_chanctx *ctx)
+{
+	int idx = ctx - &sc->chanctx[0];
+
+	return &sc->chanctx[!idx];
+}
+
+static void ath_chanctx_adjust_tbtt_delta(struct ath_softc *sc)
+{
+	struct ath_chanctx *prev, *cur;
+	struct timespec64 ts;
+	u32 cur_tsf, prev_tsf, beacon_int;
+	s32 offset;
+
+	beacon_int = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
+
+	cur = sc->cur_chan;
+	prev = ath_chanctx_get_next(sc, cur);
+
+	if (!prev->switch_after_beacon)
+		return;
+
+	ktime_get_raw_ts64(&ts);
+	cur_tsf = (u32) cur->tsf_val +
+		  ath9k_hw_get_tsf_offset(&cur->tsf_ts, &ts);
+
+	prev_tsf = prev->last_beacon - (u32) prev->tsf_val + cur_tsf;
+	prev_tsf -= ath9k_hw_get_tsf_offset(&prev->tsf_ts, &ts);
+
+	/* Adjust the TSF time of the AP chanctx to keep its beacons
+	 * at half beacon interval offset relative to the STA chanctx.
+	 */
+	offset = cur_tsf - prev_tsf;
+
+	/* Ignore stale data or spurious timestamps */
+	if (offset < 0 || offset > 3 * beacon_int)
+		return;
+
+	offset = beacon_int / 2 - (offset % beacon_int);
+	prev->tsf_val += offset;
+}
+
+/* Configure the TSF based hardware timer for a channel switch.
+ * Also set up backup software timer, in case the gen timer fails.
+ * This could be caused by a hardware reset.
+ */
+static void ath_chanctx_setup_timer(struct ath_softc *sc, u32 tsf_time)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_hw *ah = sc->sc_ah;
+	unsigned long timeout;
+
+	ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, tsf_time, 1000000);
+	tsf_time -= ath9k_hw_gettsf32(ah);
+	timeout = msecs_to_jiffies(tsf_time / 1000) + 1;
+	mod_timer(&sc->sched.timer, jiffies + timeout);
+
+	ath_dbg(common, CHAN_CTX,
+		"Setup chanctx timer with timeout: %d (%d) ms\n",
+		tsf_time / 1000, jiffies_to_msecs(timeout));
+}
+
+static void ath_chanctx_handle_bmiss(struct ath_softc *sc,
+				     struct ath_chanctx *ctx,
+				     struct ath_vif *avp)
+{
+	/*
+	 * Clear the extend_absence flag if it had been
+	 * set during the previous beacon transmission,
+	 * since we need to revert to the normal NoA
+	 * schedule.
+	 */
+	if (ctx->active && sc->sched.extend_absence) {
+		avp->noa_duration = 0;
+		sc->sched.extend_absence = false;
+	}
+
+	/* If at least two consecutive beacons were missed on the STA
+	 * chanctx, stay on the STA channel for one extra beacon period,
+	 * to resync the timer properly.
+	 */
+	if (ctx->active && sc->sched.beacon_miss >= 2) {
+		avp->noa_duration = 0;
+		sc->sched.extend_absence = true;
+	}
+}
+
+static void ath_chanctx_offchannel_noa(struct ath_softc *sc,
+				       struct ath_chanctx *ctx,
+				       struct ath_vif *avp,
+				       u32 tsf_time)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	avp->noa_index++;
+	avp->offchannel_start = tsf_time;
+	avp->offchannel_duration = sc->sched.offchannel_duration;
+
+	ath_dbg(common, CHAN_CTX,
+		"offchannel noa_duration: %d, noa_start: %u, noa_index: %d\n",
+		avp->offchannel_duration,
+		avp->offchannel_start,
+		avp->noa_index);
+
+	/*
+	 * When multiple contexts are active, the NoA
+	 * has to be recalculated and advertised after
+	 * an offchannel operation.
+	 */
+	if (ctx->active && avp->noa_duration)
+		avp->noa_duration = 0;
+}
+
+static void ath_chanctx_set_periodic_noa(struct ath_softc *sc,
+					 struct ath_vif *avp,
+					 struct ath_beacon_config *cur_conf,
+					 u32 tsf_time,
+					 u32 beacon_int)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	avp->noa_index++;
+	avp->noa_start = tsf_time;
+
+	if (sc->sched.extend_absence)
+		avp->noa_duration = (3 * beacon_int / 2) +
+			sc->sched.channel_switch_time;
+	else
+		avp->noa_duration =
+			TU_TO_USEC(cur_conf->beacon_interval) / 2 +
+			sc->sched.channel_switch_time;
+
+	if (test_bit(ATH_OP_SCANNING, &common->op_flags) ||
+	    sc->sched.extend_absence)
+		avp->periodic_noa = false;
+	else
+		avp->periodic_noa = true;
+
+	ath_dbg(common, CHAN_CTX,
+		"noa_duration: %d, noa_start: %u, noa_index: %d, periodic: %d\n",
+		avp->noa_duration,
+		avp->noa_start,
+		avp->noa_index,
+		avp->periodic_noa);
+}
+
+static void ath_chanctx_set_oneshot_noa(struct ath_softc *sc,
+					struct ath_vif *avp,
+					u32 tsf_time,
+					u32 duration)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	avp->noa_index++;
+	avp->noa_start = tsf_time;
+	avp->periodic_noa = false;
+	avp->oneshot_noa = true;
+	avp->noa_duration = duration + sc->sched.channel_switch_time;
+
+	ath_dbg(common, CHAN_CTX,
+		"oneshot noa_duration: %d, noa_start: %u, noa_index: %d, periodic: %d\n",
+		avp->noa_duration,
+		avp->noa_start,
+		avp->noa_index,
+		avp->periodic_noa);
+}
+
+void ath_chanctx_event(struct ath_softc *sc, struct ieee80211_vif *vif,
+		       enum ath_chanctx_event ev)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	struct ath_common *common = ath9k_hw_common(ah);
+	struct ath_beacon_config *cur_conf;
+	struct ath_vif *avp = NULL;
+	struct ath_chanctx *ctx;
+	u32 tsf_time;
+	u32 beacon_int;
+
+	if (vif)
+		avp = (struct ath_vif *) vif->drv_priv;
+
+	spin_lock_bh(&sc->chan_lock);
+
+	ath_dbg(common, CHAN_CTX, "cur_chan: %d MHz, event: %s, state: %s, delta: %u ms\n",
+		sc->cur_chan->chandef.center_freq1,
+		chanctx_event_string(ev),
+		chanctx_state_string(sc->sched.state),
+		chanctx_event_delta(sc));
+
+	switch (ev) {
+	case ATH_CHANCTX_EVENT_BEACON_PREPARE:
+		if (avp->offchannel_duration)
+			avp->offchannel_duration = 0;
+
+		if (avp->oneshot_noa) {
+			avp->noa_duration = 0;
+			avp->oneshot_noa = false;
+
+			ath_dbg(common, CHAN_CTX,
+				"Clearing oneshot NoA\n");
+		}
+
+		if (avp->chanctx != sc->cur_chan) {
+			ath_dbg(common, CHAN_CTX,
+				"Contexts differ, not preparing beacon\n");
+			break;
+		}
+
+		if (sc->sched.offchannel_pending && !sc->sched.wait_switch) {
+			sc->sched.offchannel_pending = false;
+			sc->next_chan = &sc->offchannel.chan;
+			sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
+			ath_dbg(common, CHAN_CTX,
+				"Setting offchannel_pending to false\n");
+		}
+
+		ctx = ath_chanctx_get_next(sc, sc->cur_chan);
+		if (ctx->active && sc->sched.state == ATH_CHANCTX_STATE_IDLE) {
+			sc->next_chan = ctx;
+			sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
+			ath_dbg(common, CHAN_CTX,
+				"Set next context, move chanctx state to WAIT_FOR_BEACON\n");
+		}
+
+		/* if the timer missed its window, use the next interval */
+		if (sc->sched.state == ATH_CHANCTX_STATE_WAIT_FOR_TIMER) {
+			sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
+			ath_dbg(common, CHAN_CTX,
+				"Move chanctx state from WAIT_FOR_TIMER to WAIT_FOR_BEACON\n");
+		}
+
+		if (sc->sched.mgd_prepare_tx)
+			sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
+
+		/*
+		 * When a context becomes inactive, for example,
+		 * disassociation of a station context, the NoA
+		 * attribute needs to be removed from subsequent
+		 * beacons.
+		 */
+		if (!ctx->active && avp->noa_duration &&
+		    sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON) {
+			avp->noa_duration = 0;
+			avp->periodic_noa = false;
+
+			ath_dbg(common, CHAN_CTX,
+				"Clearing NoA schedule\n");
+		}
+
+		if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
+			break;
+
+		ath_dbg(common, CHAN_CTX, "Preparing beacon for vif: %pM\n", vif->addr);
+
+		sc->sched.beacon_pending = true;
+		sc->sched.next_tbtt = REG_READ(ah, AR_NEXT_TBTT_TIMER);
+
+		cur_conf = &sc->cur_chan->beacon;
+		beacon_int = TU_TO_USEC(cur_conf->beacon_interval);
+
+		/* defer channel switch by a quarter beacon interval */
+		tsf_time = sc->sched.next_tbtt + beacon_int / 4;
+		sc->sched.switch_start_time = tsf_time;
+		sc->cur_chan->last_beacon = sc->sched.next_tbtt;
+
+		/*
+		 * If an offchannel switch is scheduled to happen after
+		 * a beacon transmission, update the NoA with one-shot
+		 * values and increment the index.
+		 */
+		if (sc->next_chan == &sc->offchannel.chan) {
+			ath_chanctx_offchannel_noa(sc, ctx, avp, tsf_time);
+			break;
+		}
+
+		ath_chanctx_handle_bmiss(sc, ctx, avp);
+
+		/*
+		 * If a mgd_prepare_tx() has been called by mac80211,
+		 * a one-shot NoA needs to be sent. This can happen
+		 * with one or more active channel contexts - in both
+		 * cases, a new NoA schedule has to be advertised.
+		 */
+		if (sc->sched.mgd_prepare_tx) {
+			ath_chanctx_set_oneshot_noa(sc, avp, tsf_time,
+						    jiffies_to_usecs(HZ / 5));
+			break;
+		}
+
+		/* Prevent wrap-around issues */
+		if (avp->noa_duration && tsf_time - avp->noa_start > BIT(30))
+			avp->noa_duration = 0;
+
+		/*
+		 * If multiple contexts are active, start periodic
+		 * NoA and increment the index for the first
+		 * announcement.
+		 */
+		if (ctx->active &&
+		    (!avp->noa_duration || sc->sched.force_noa_update))
+			ath_chanctx_set_periodic_noa(sc, avp, cur_conf,
+						     tsf_time, beacon_int);
+
+		if (ctx->active && sc->sched.force_noa_update)
+			sc->sched.force_noa_update = false;
+
+		break;
+	case ATH_CHANCTX_EVENT_BEACON_SENT:
+		if (!sc->sched.beacon_pending) {
+			ath_dbg(common, CHAN_CTX,
+				"No pending beacon\n");
+			break;
+		}
+
+		sc->sched.beacon_pending = false;
+
+		if (sc->sched.mgd_prepare_tx) {
+			sc->sched.mgd_prepare_tx = false;
+			complete(&sc->go_beacon);
+			ath_dbg(common, CHAN_CTX,
+				"Beacon sent, complete go_beacon\n");
+			break;
+		}
+
+		if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_BEACON)
+			break;
+
+		ath_dbg(common, CHAN_CTX,
+			"Move chanctx state to WAIT_FOR_TIMER\n");
+
+		sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
+		ath_chanctx_setup_timer(sc, sc->sched.switch_start_time);
+		break;
+	case ATH_CHANCTX_EVENT_TSF_TIMER:
+		if (sc->sched.state != ATH_CHANCTX_STATE_WAIT_FOR_TIMER)
+			break;
+
+		if (!sc->cur_chan->switch_after_beacon &&
+		    sc->sched.beacon_pending)
+			sc->sched.beacon_miss++;
+
+		ath_dbg(common, CHAN_CTX,
+			"Move chanctx state to SWITCH\n");
+
+		sc->sched.state = ATH_CHANCTX_STATE_SWITCH;
+		ieee80211_queue_work(sc->hw, &sc->chanctx_work);
+		break;
+	case ATH_CHANCTX_EVENT_BEACON_RECEIVED:
+		if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
+		    sc->cur_chan == &sc->offchannel.chan)
+			break;
+
+		sc->sched.beacon_pending = false;
+		sc->sched.beacon_miss = 0;
+
+		if (sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
+		    !sc->sched.beacon_adjust ||
+		    !sc->cur_chan->tsf_val)
+			break;
+
+		ath_chanctx_adjust_tbtt_delta(sc);
+
+		/* TSF time might have been updated by the incoming beacon,
+		 * need update the channel switch timer to reflect the change.
+		 */
+		tsf_time = sc->sched.switch_start_time;
+		tsf_time -= (u32) sc->cur_chan->tsf_val +
+			ath9k_hw_get_tsf_offset(&sc->cur_chan->tsf_ts, NULL);
+		tsf_time += ath9k_hw_gettsf32(ah);
+
+		sc->sched.beacon_adjust = false;
+		ath_chanctx_setup_timer(sc, tsf_time);
+		break;
+	case ATH_CHANCTX_EVENT_AUTHORIZED:
+		if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE ||
+		    avp->chanctx != sc->cur_chan)
+			break;
+
+		ath_dbg(common, CHAN_CTX,
+			"Move chanctx state from FORCE_ACTIVE to IDLE\n");
+
+		sc->sched.state = ATH_CHANCTX_STATE_IDLE;
+		/* fall through */
+	case ATH_CHANCTX_EVENT_SWITCH:
+		if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
+		    sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
+		    sc->cur_chan->switch_after_beacon ||
+		    sc->cur_chan == &sc->offchannel.chan)
+			break;
+
+		/* If this is a station chanctx, stay active for a half
+		 * beacon period (minus channel switch time)
+		 */
+		sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
+		cur_conf = &sc->cur_chan->beacon;
+
+		ath_dbg(common, CHAN_CTX,
+			"Move chanctx state to WAIT_FOR_TIMER (event SWITCH)\n");
+
+		sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_TIMER;
+		sc->sched.wait_switch = false;
+
+		tsf_time = TU_TO_USEC(cur_conf->beacon_interval) / 2;
+
+		if (sc->sched.extend_absence) {
+			sc->sched.beacon_miss = 0;
+			tsf_time *= 3;
+		}
+
+		tsf_time -= sc->sched.channel_switch_time;
+		tsf_time += ath9k_hw_gettsf32(sc->sc_ah);
+		sc->sched.switch_start_time = tsf_time;
+
+		ath_chanctx_setup_timer(sc, tsf_time);
+		sc->sched.beacon_pending = true;
+		sc->sched.beacon_adjust = true;
+		break;
+	case ATH_CHANCTX_EVENT_ENABLE_MULTICHANNEL:
+		if (sc->cur_chan == &sc->offchannel.chan ||
+		    sc->cur_chan->switch_after_beacon)
+			break;
+
+		sc->next_chan = ath_chanctx_get_next(sc, sc->cur_chan);
+		ieee80211_queue_work(sc->hw, &sc->chanctx_work);
+		break;
+	case ATH_CHANCTX_EVENT_UNASSIGN:
+		if (sc->cur_chan->assigned) {
+			if (sc->next_chan && !sc->next_chan->assigned &&
+			    sc->next_chan != &sc->offchannel.chan)
+				sc->sched.state = ATH_CHANCTX_STATE_IDLE;
+			break;
+		}
+
+		ctx = ath_chanctx_get_next(sc, sc->cur_chan);
+		sc->sched.state = ATH_CHANCTX_STATE_IDLE;
+		if (!ctx->assigned)
+			break;
+
+		sc->next_chan = ctx;
+		ieee80211_queue_work(sc->hw, &sc->chanctx_work);
+		break;
+	case ATH_CHANCTX_EVENT_ASSIGN:
+		break;
+	case ATH_CHANCTX_EVENT_CHANGE:
+		break;
+	}
+
+	spin_unlock_bh(&sc->chan_lock);
+}
+
+void ath_chanctx_beacon_sent_ev(struct ath_softc *sc,
+				enum ath_chanctx_event ev)
+{
+	if (sc->sched.beacon_pending)
+		ath_chanctx_event(sc, NULL, ev);
+}
+
+void ath_chanctx_beacon_recv_ev(struct ath_softc *sc,
+				enum ath_chanctx_event ev)
+{
+	ath_chanctx_event(sc, NULL, ev);
+}
+
+static int ath_scan_channel_duration(struct ath_softc *sc,
+				     struct ieee80211_channel *chan)
+{
+	struct cfg80211_scan_request *req = sc->offchannel.scan_req;
+
+	if (!req->n_ssids || (chan->flags & IEEE80211_CHAN_NO_IR))
+		return (HZ / 9); /* ~110 ms */
+
+	return (HZ / 16); /* ~60 ms */
+}
+
+static void ath_chanctx_switch(struct ath_softc *sc, struct ath_chanctx *ctx,
+			       struct cfg80211_chan_def *chandef)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	spin_lock_bh(&sc->chan_lock);
+
+	if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) &&
+	    (sc->cur_chan != ctx) && (ctx == &sc->offchannel.chan)) {
+		if (chandef)
+			ctx->chandef = *chandef;
+
+		sc->sched.offchannel_pending = true;
+		sc->sched.wait_switch = true;
+		sc->sched.offchannel_duration =
+			jiffies_to_usecs(sc->offchannel.duration) +
+			sc->sched.channel_switch_time;
+
+		spin_unlock_bh(&sc->chan_lock);
+		ath_dbg(common, CHAN_CTX,
+			"Set offchannel_pending to true\n");
+		return;
+	}
+
+	sc->next_chan = ctx;
+	if (chandef) {
+		ctx->chandef = *chandef;
+		ath_dbg(common, CHAN_CTX,
+			"Assigned next_chan to %d MHz\n", chandef->center_freq1);
+	}
+
+	if (sc->next_chan == &sc->offchannel.chan) {
+		sc->sched.offchannel_duration =
+			jiffies_to_usecs(sc->offchannel.duration) +
+			sc->sched.channel_switch_time;
+
+		if (chandef) {
+			ath_dbg(common, CHAN_CTX,
+				"Offchannel duration for chan %d MHz : %u\n",
+				chandef->center_freq1,
+				sc->sched.offchannel_duration);
+		}
+	}
+	spin_unlock_bh(&sc->chan_lock);
+	ieee80211_queue_work(sc->hw, &sc->chanctx_work);
+}
+
+static void ath_chanctx_offchan_switch(struct ath_softc *sc,
+				       struct ieee80211_channel *chan)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct cfg80211_chan_def chandef;
+
+	cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
+	ath_dbg(common, CHAN_CTX,
+		"Channel definition created: %d MHz\n", chandef.center_freq1);
+
+	ath_chanctx_switch(sc, &sc->offchannel.chan, &chandef);
+}
+
+static struct ath_chanctx *ath_chanctx_get_oper_chan(struct ath_softc *sc,
+						     bool active)
+{
+	struct ath_chanctx *ctx;
+
+	ath_for_each_chanctx(sc, ctx) {
+		if (!ctx->assigned || list_empty(&ctx->vifs))
+			continue;
+		if (active && !ctx->active)
+			continue;
+
+		if (ctx->switch_after_beacon)
+			return ctx;
+	}
+
+	return &sc->chanctx[0];
+}
+
+static void
+ath_scan_next_channel(struct ath_softc *sc)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct cfg80211_scan_request *req = sc->offchannel.scan_req;
+	struct ieee80211_channel *chan;
+
+	if (sc->offchannel.scan_idx >= req->n_channels) {
+		ath_dbg(common, CHAN_CTX,
+			"Moving offchannel state to ATH_OFFCHANNEL_IDLE, "
+			"scan_idx: %d, n_channels: %d\n",
+			sc->offchannel.scan_idx,
+			req->n_channels);
+
+		sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
+		ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
+				   NULL);
+		return;
+	}
+
+	ath_dbg(common, CHAN_CTX,
+		"Moving offchannel state to ATH_OFFCHANNEL_PROBE_SEND, scan_idx: %d\n",
+		sc->offchannel.scan_idx);
+
+	chan = req->channels[sc->offchannel.scan_idx++];
+	sc->offchannel.duration = ath_scan_channel_duration(sc, chan);
+	sc->offchannel.state = ATH_OFFCHANNEL_PROBE_SEND;
+
+	ath_chanctx_offchan_switch(sc, chan);
+}
+
+void ath_offchannel_next(struct ath_softc *sc)
+{
+	struct ieee80211_vif *vif;
+
+	if (sc->offchannel.scan_req) {
+		vif = sc->offchannel.scan_vif;
+		sc->offchannel.chan.txpower = vif->bss_conf.txpower;
+		ath_scan_next_channel(sc);
+	} else if (sc->offchannel.roc_vif) {
+		vif = sc->offchannel.roc_vif;
+		sc->offchannel.chan.txpower = vif->bss_conf.txpower;
+		sc->offchannel.duration =
+			msecs_to_jiffies(sc->offchannel.roc_duration);
+		sc->offchannel.state = ATH_OFFCHANNEL_ROC_START;
+		ath_chanctx_offchan_switch(sc, sc->offchannel.roc_chan);
+	} else {
+		spin_lock_bh(&sc->chan_lock);
+		sc->sched.offchannel_pending = false;
+		sc->sched.wait_switch = false;
+		spin_unlock_bh(&sc->chan_lock);
+
+		ath_chanctx_switch(sc, ath_chanctx_get_oper_chan(sc, false),
+				   NULL);
+		sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
+		if (sc->ps_idle)
+			ath_cancel_work(sc);
+	}
+}
+
+void ath_roc_complete(struct ath_softc *sc, enum ath_roc_complete_reason reason)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	sc->offchannel.roc_vif = NULL;
+	sc->offchannel.roc_chan = NULL;
+
+	switch (reason) {
+	case ATH_ROC_COMPLETE_ABORT:
+		ath_dbg(common, CHAN_CTX, "RoC aborted\n");
+		ieee80211_remain_on_channel_expired(sc->hw);
+		break;
+	case ATH_ROC_COMPLETE_EXPIRE:
+		ath_dbg(common, CHAN_CTX, "RoC expired\n");
+		ieee80211_remain_on_channel_expired(sc->hw);
+		break;
+	case ATH_ROC_COMPLETE_CANCEL:
+		ath_dbg(common, CHAN_CTX, "RoC canceled\n");
+		break;
+	}
+
+	ath_offchannel_next(sc);
+	ath9k_ps_restore(sc);
+}
+
+void ath_scan_complete(struct ath_softc *sc, bool abort)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct cfg80211_scan_info info = {
+		.aborted = abort,
+	};
+
+	if (abort)
+		ath_dbg(common, CHAN_CTX, "HW scan aborted\n");
+	else
+		ath_dbg(common, CHAN_CTX, "HW scan complete\n");
+
+	sc->offchannel.scan_req = NULL;
+	sc->offchannel.scan_vif = NULL;
+	sc->offchannel.state = ATH_OFFCHANNEL_IDLE;
+	ieee80211_scan_completed(sc->hw, &info);
+	clear_bit(ATH_OP_SCANNING, &common->op_flags);
+	spin_lock_bh(&sc->chan_lock);
+	if (test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags))
+		sc->sched.force_noa_update = true;
+	spin_unlock_bh(&sc->chan_lock);
+	ath_offchannel_next(sc);
+	ath9k_ps_restore(sc);
+}
+
+static void ath_scan_send_probe(struct ath_softc *sc,
+				struct cfg80211_ssid *ssid)
+{
+	struct cfg80211_scan_request *req = sc->offchannel.scan_req;
+	struct ieee80211_vif *vif = sc->offchannel.scan_vif;
+	struct ath_tx_control txctl = {};
+	struct sk_buff *skb;
+	struct ieee80211_tx_info *info;
+	int band = sc->offchannel.chan.chandef.chan->band;
+
+	skb = ieee80211_probereq_get(sc->hw, vif->addr,
+			ssid->ssid, ssid->ssid_len, req->ie_len);
+	if (!skb)
+		return;
+
+	info = IEEE80211_SKB_CB(skb);
+	if (req->no_cck)
+		info->flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
+
+	if (req->ie_len)
+		skb_put_data(skb, req->ie, req->ie_len);
+
+	skb_set_queue_mapping(skb, IEEE80211_AC_VO);
+
+	if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, NULL))
+		goto error;
+
+	txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
+	if (ath_tx_start(sc->hw, skb, &txctl))
+		goto error;
+
+	return;
+
+error:
+	ieee80211_free_txskb(sc->hw, skb);
+}
+
+static void ath_scan_channel_start(struct ath_softc *sc)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct cfg80211_scan_request *req = sc->offchannel.scan_req;
+	int i;
+
+	if (!(sc->cur_chan->chandef.chan->flags & IEEE80211_CHAN_NO_IR) &&
+	    req->n_ssids) {
+		for (i = 0; i < req->n_ssids; i++)
+			ath_scan_send_probe(sc, &req->ssids[i]);
+
+	}
+
+	ath_dbg(common, CHAN_CTX,
+		"Moving offchannel state to ATH_OFFCHANNEL_PROBE_WAIT\n");
+
+	sc->offchannel.state = ATH_OFFCHANNEL_PROBE_WAIT;
+	mod_timer(&sc->offchannel.timer, jiffies + sc->offchannel.duration);
+}
+
+static void ath_chanctx_timer(struct timer_list *t)
+{
+	struct ath_softc *sc = from_timer(sc, t, sched.timer);
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	ath_dbg(common, CHAN_CTX,
+		"Channel context timer invoked\n");
+
+	ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
+}
+
+static void ath_offchannel_timer(struct timer_list *t)
+{
+	struct ath_softc *sc = from_timer(sc, t, offchannel.timer);
+	struct ath_chanctx *ctx;
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
+		__func__, offchannel_state_string(sc->offchannel.state));
+
+	switch (sc->offchannel.state) {
+	case ATH_OFFCHANNEL_PROBE_WAIT:
+		if (!sc->offchannel.scan_req)
+			return;
+
+		/* get first active channel context */
+		ctx = ath_chanctx_get_oper_chan(sc, true);
+		if (ctx->active) {
+			ath_dbg(common, CHAN_CTX,
+				"Switch to oper/active context, "
+				"move offchannel state to ATH_OFFCHANNEL_SUSPEND\n");
+
+			sc->offchannel.state = ATH_OFFCHANNEL_SUSPEND;
+			ath_chanctx_switch(sc, ctx, NULL);
+			mod_timer(&sc->offchannel.timer, jiffies + HZ / 10);
+			break;
+		}
+		/* fall through */
+	case ATH_OFFCHANNEL_SUSPEND:
+		if (!sc->offchannel.scan_req)
+			return;
+
+		ath_scan_next_channel(sc);
+		break;
+	case ATH_OFFCHANNEL_ROC_START:
+	case ATH_OFFCHANNEL_ROC_WAIT:
+		sc->offchannel.state = ATH_OFFCHANNEL_ROC_DONE;
+		ath_roc_complete(sc, ATH_ROC_COMPLETE_EXPIRE);
+		break;
+	default:
+		break;
+	}
+}
+
+static bool
+ath_chanctx_send_vif_ps_frame(struct ath_softc *sc, struct ath_vif *avp,
+			      bool powersave)
+{
+	struct ieee80211_vif *vif = avp->vif;
+	struct ieee80211_sta *sta = NULL;
+	struct ieee80211_hdr_3addr *nullfunc;
+	struct ath_tx_control txctl;
+	struct sk_buff *skb;
+	int band = sc->cur_chan->chandef.chan->band;
+
+	switch (vif->type) {
+	case NL80211_IFTYPE_STATION:
+		if (!avp->assoc)
+			return false;
+
+		skb = ieee80211_nullfunc_get(sc->hw, vif, false);
+		if (!skb)
+			return false;
+
+		nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
+		if (powersave)
+			nullfunc->frame_control |=
+				cpu_to_le16(IEEE80211_FCTL_PM);
+
+		skb->priority = 7;
+		skb_set_queue_mapping(skb, IEEE80211_AC_VO);
+		if (!ieee80211_tx_prepare_skb(sc->hw, vif, skb, band, &sta)) {
+			dev_kfree_skb_any(skb);
+			return false;
+		}
+		break;
+	default:
+		return false;
+	}
+
+	memset(&txctl, 0, sizeof(txctl));
+	txctl.txq = sc->tx.txq_map[IEEE80211_AC_VO];
+	txctl.sta = sta;
+	if (ath_tx_start(sc->hw, skb, &txctl)) {
+		ieee80211_free_txskb(sc->hw, skb);
+		return false;
+	}
+
+	return true;
+}
+
+static bool
+ath_chanctx_send_ps_frame(struct ath_softc *sc, bool powersave)
+{
+	struct ath_vif *avp;
+	bool sent = false;
+
+	rcu_read_lock();
+	list_for_each_entry(avp, &sc->cur_chan->vifs, list) {
+		if (ath_chanctx_send_vif_ps_frame(sc, avp, powersave))
+			sent = true;
+	}
+	rcu_read_unlock();
+
+	return sent;
+}
+
+static bool ath_chanctx_defer_switch(struct ath_softc *sc)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	if (sc->cur_chan == &sc->offchannel.chan)
+		return false;
+
+	switch (sc->sched.state) {
+	case ATH_CHANCTX_STATE_SWITCH:
+		return false;
+	case ATH_CHANCTX_STATE_IDLE:
+		if (!sc->cur_chan->switch_after_beacon)
+			return false;
+
+		ath_dbg(common, CHAN_CTX,
+			"Defer switch, set chanctx state to WAIT_FOR_BEACON\n");
+
+		sc->sched.state = ATH_CHANCTX_STATE_WAIT_FOR_BEACON;
+		break;
+	default:
+		break;
+	}
+
+	return true;
+}
+
+static void ath_offchannel_channel_change(struct ath_softc *sc)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+
+	ath_dbg(common, CHAN_CTX, "%s: offchannel state: %s\n",
+		__func__, offchannel_state_string(sc->offchannel.state));
+
+	switch (sc->offchannel.state) {
+	case ATH_OFFCHANNEL_PROBE_SEND:
+		if (!sc->offchannel.scan_req)
+			return;
+
+		if (sc->cur_chan->chandef.chan !=
+		    sc->offchannel.chan.chandef.chan)
+			return;
+
+		ath_scan_channel_start(sc);
+		break;
+	case ATH_OFFCHANNEL_IDLE:
+		if (!sc->offchannel.scan_req)
+			return;
+
+		ath_scan_complete(sc, false);
+		break;
+	case ATH_OFFCHANNEL_ROC_START:
+		if (sc->cur_chan != &sc->offchannel.chan)
+			break;
+
+		sc->offchannel.state = ATH_OFFCHANNEL_ROC_WAIT;
+		mod_timer(&sc->offchannel.timer,
+			  jiffies + sc->offchannel.duration);
+		ieee80211_ready_on_channel(sc->hw);
+		break;
+	case ATH_OFFCHANNEL_ROC_DONE:
+		break;
+	default:
+		break;
+	}
+}
+
+void ath_chanctx_set_next(struct ath_softc *sc, bool force)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_chanctx *old_ctx;
+	struct timespec64 ts;
+	bool measure_time = false;
+	bool send_ps = false;
+	bool queues_stopped = false;
+
+	spin_lock_bh(&sc->chan_lock);
+	if (!sc->next_chan) {
+		spin_unlock_bh(&sc->chan_lock);
+		return;
+	}
+
+	if (!force && ath_chanctx_defer_switch(sc)) {
+		spin_unlock_bh(&sc->chan_lock);
+		return;
+	}
+
+	ath_dbg(common, CHAN_CTX,
+		"%s: current: %d MHz, next: %d MHz\n",
+		__func__,
+		sc->cur_chan->chandef.center_freq1,
+		sc->next_chan->chandef.center_freq1);
+
+	if (sc->cur_chan != sc->next_chan) {
+		ath_dbg(common, CHAN_CTX,
+			"Stopping current chanctx: %d\n",
+			sc->cur_chan->chandef.center_freq1);
+		sc->cur_chan->stopped = true;
+		spin_unlock_bh(&sc->chan_lock);
+
+		if (sc->next_chan == &sc->offchannel.chan) {
+			ktime_get_raw_ts64(&ts);
+			measure_time = true;
+		}
+
+		ath9k_chanctx_stop_queues(sc, sc->cur_chan);
+		queues_stopped = true;
+
+		__ath9k_flush(sc->hw, ~0, true, false, false);
+
+		if (ath_chanctx_send_ps_frame(sc, true))
+			__ath9k_flush(sc->hw, BIT(IEEE80211_AC_VO),
+				      false, false, false);
+
+		send_ps = true;
+		spin_lock_bh(&sc->chan_lock);
+
+		if (sc->cur_chan != &sc->offchannel.chan) {
+			ktime_get_raw_ts64(&sc->cur_chan->tsf_ts);
+			sc->cur_chan->tsf_val = ath9k_hw_gettsf64(sc->sc_ah);
+		}
+	}
+	old_ctx = sc->cur_chan;
+	sc->cur_chan = sc->next_chan;
+	sc->cur_chan->stopped = false;
+	sc->next_chan = NULL;
+
+	if (!sc->sched.offchannel_pending)
+		sc->sched.offchannel_duration = 0;
+
+	if (sc->sched.state != ATH_CHANCTX_STATE_FORCE_ACTIVE)
+		sc->sched.state = ATH_CHANCTX_STATE_IDLE;
+
+	spin_unlock_bh(&sc->chan_lock);
+
+	if (sc->sc_ah->chip_fullsleep ||
+	    memcmp(&sc->cur_chandef, &sc->cur_chan->chandef,
+		   sizeof(sc->cur_chandef))) {
+		ath_dbg(common, CHAN_CTX,
+			"%s: Set channel %d MHz\n",
+			__func__, sc->cur_chan->chandef.center_freq1);
+		ath_set_channel(sc);
+		if (measure_time)
+			sc->sched.channel_switch_time =
+				ath9k_hw_get_tsf_offset(&ts, NULL);
+		/*
+		 * A reset will ensure that all queues are woken up,
+		 * so there is no need to awaken them again.
+		 */
+		goto out;
+	}
+
+	if (queues_stopped)
+		ath9k_chanctx_wake_queues(sc, old_ctx);
+out:
+	if (send_ps)
+		ath_chanctx_send_ps_frame(sc, false);
+
+	ath_offchannel_channel_change(sc);
+	ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_SWITCH);
+}
+
+static void ath_chanctx_work(struct work_struct *work)
+{
+	struct ath_softc *sc = container_of(work, struct ath_softc,
+					    chanctx_work);
+	mutex_lock(&sc->mutex);
+	ath_chanctx_set_next(sc, false);
+	mutex_unlock(&sc->mutex);
+}
+
+void ath9k_offchannel_init(struct ath_softc *sc)
+{
+	struct ath_chanctx *ctx;
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ieee80211_supported_band *sband;
+	struct ieee80211_channel *chan;
+	int i;
+
+	sband = &common->sbands[NL80211_BAND_2GHZ];
+	if (!sband->n_channels)
+		sband = &common->sbands[NL80211_BAND_5GHZ];
+
+	chan = &sband->channels[0];
+
+	ctx = &sc->offchannel.chan;
+	INIT_LIST_HEAD(&ctx->vifs);
+	ctx->txpower = ATH_TXPOWER_MAX;
+	cfg80211_chandef_create(&ctx->chandef, chan, NL80211_CHAN_HT20);
+
+	for (i = 0; i < ARRAY_SIZE(ctx->acq); i++) {
+		INIT_LIST_HEAD(&ctx->acq[i].acq_new);
+		INIT_LIST_HEAD(&ctx->acq[i].acq_old);
+		spin_lock_init(&ctx->acq[i].lock);
+	}
+
+	sc->offchannel.chan.offchannel = true;
+}
+
+void ath9k_init_channel_context(struct ath_softc *sc)
+{
+	INIT_WORK(&sc->chanctx_work, ath_chanctx_work);
+
+	timer_setup(&sc->offchannel.timer, ath_offchannel_timer, 0);
+	timer_setup(&sc->sched.timer, ath_chanctx_timer, 0);
+
+	init_completion(&sc->go_beacon);
+}
+
+void ath9k_deinit_channel_context(struct ath_softc *sc)
+{
+	cancel_work_sync(&sc->chanctx_work);
+}
+
+bool ath9k_is_chanctx_enabled(void)
+{
+	return (ath9k_use_chanctx == 1);
+}
+
+/********************/
+/* Queue management */
+/********************/
+
+void ath9k_chanctx_stop_queues(struct ath_softc *sc, struct ath_chanctx *ctx)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	int i;
+
+	if (ctx == &sc->offchannel.chan) {
+		ieee80211_stop_queue(sc->hw,
+				     sc->hw->offchannel_tx_hw_queue);
+	} else {
+		for (i = 0; i < IEEE80211_NUM_ACS; i++)
+			ieee80211_stop_queue(sc->hw,
+					     ctx->hw_queue_base + i);
+	}
+
+	if (ah->opmode == NL80211_IFTYPE_AP)
+		ieee80211_stop_queue(sc->hw, sc->hw->queues - 2);
+}
+
+
+void ath9k_chanctx_wake_queues(struct ath_softc *sc, struct ath_chanctx *ctx)
+{
+	struct ath_hw *ah = sc->sc_ah;
+	int i;
+
+	if (ctx == &sc->offchannel.chan) {
+		ieee80211_wake_queue(sc->hw,
+				     sc->hw->offchannel_tx_hw_queue);
+	} else {
+		for (i = 0; i < IEEE80211_NUM_ACS; i++)
+			ieee80211_wake_queue(sc->hw,
+					     ctx->hw_queue_base + i);
+	}
+
+	if (ah->opmode == NL80211_IFTYPE_AP)
+		ieee80211_wake_queue(sc->hw, sc->hw->queues - 2);
+}
+
+/*****************/
+/* P2P Powersave */
+/*****************/
+
+static void ath9k_update_p2p_ps_timer(struct ath_softc *sc, struct ath_vif *avp)
+{
+	struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+	struct ath_hw *ah = sc->sc_ah;
+	u32 tsf, target_tsf;
+
+	if (!avp || !avp->noa.has_next_tsf)
+		return;
+
+	ath9k_hw_gen_timer_stop(ah, sc->p2p_ps_timer);
+
+	tsf = ath9k_hw_gettsf32(sc->sc_ah);
+
+	target_tsf = avp->noa.next_tsf;
+	if (!avp->noa.absent)
+		target_tsf -= ATH_P2P_PS_STOP_TIME;
+	else
+		target_tsf += ATH_P2P_PS_STOP_TIME;
+
+	if (target_tsf - tsf < ATH_P2P_PS_STOP_TIME)
+		target_tsf = tsf + ATH_P2P_PS_STOP_TIME;
+
+	ath_dbg(common, CHAN_CTX, "%s absent %d tsf 0x%08X next_tsf 0x%08X (%dms)\n",
+		__func__, avp->noa.absent, tsf, target_tsf,
+		(target_tsf - tsf) / 1000);
+
+	ath9k_hw_gen_timer_start(ah, sc->p2p_ps_timer, target_tsf, 1000000);
+}
+
+static void ath9k_update_p2p_ps(struct ath_softc *sc, struct ieee80211_vif *vif)
+{
+	struct ath_vif *avp = (void *)vif->drv_priv;
+	u32 tsf;
+
+	if (!sc->p2p_ps_timer)
+		return;
+
+	if (vif->type != NL80211_IFTYPE_STATION)
+		return;
+
+	sc->p2p_ps_vif = avp;
+
+	if (sc->ps_flags & PS_BEACON_SYNC)
+		return;
+
+	tsf = ath9k_hw_gettsf32(sc->sc_ah);
+	ieee80211_parse_p2p_noa(&vif->bss_conf.p2p_noa_attr, &avp->noa, tsf);
+	ath9k_update_p2p_ps_timer(sc, avp);
+}
+
+static u8 ath9k_get_ctwin(struct ath_softc *sc, struct ath_vif *avp)
+{
+	struct ath_beacon_config *cur_conf = &sc->cur_chan->beacon;
+	u8 switch_time, ctwin;
+
+	/*
+	 * Channel switch in multi-channel mode is deferred
+	 * by a quarter beacon interval when handling
+	 * ATH_CHANCTX_EVENT_BEACON_PREPARE, so the P2P-GO
+	 * interface is guaranteed to be discoverable
+	 * for that duration after a TBTT.
+	 */
+	switch_time = cur_conf->beacon_interval / 4;
+
+	ctwin = avp->vif->bss_conf.p2p_noa_attr.oppps_ctwindow;
+	if (ctwin && (ctwin < switch_time))
+		return ctwin;
+
+	if (switch_time < P2P_DEFAULT_CTWIN)
+		return 0;
+
+	return P2P_DEFAULT_CTWIN;
+}
+
+void ath9k_beacon_add_noa(struct ath_softc *sc, struct ath_vif *avp,
+			  struct sk_buff *skb)
+{
+	static const u8 noa_ie_hdr[] = {
+		WLAN_EID_VENDOR_SPECIFIC,	/* type */
+		0,				/* length */
+		0x50, 0x6f, 0x9a,		/* WFA OUI */
+		0x09,				/* P2P subtype */
+		0x0c,				/* Notice of Absence */
+		0x00,				/* LSB of little-endian len */
+		0x00,				/* MSB of little-endian len */
+	};
+
+	struct ieee80211_p2p_noa_attr *noa;
+	int noa_len, noa_desc, i = 0;
+	u8 *hdr;
+
+	if (!avp->offchannel_duration && !avp->noa_duration)
+		return;
+
+	noa_desc = !!avp->offchannel_duration + !!avp->noa_duration;
+	noa_len = 2 + sizeof(struct ieee80211_p2p_noa_desc) * noa_desc;
+
+	hdr = skb_put_data(skb, noa_ie_hdr, sizeof(noa_ie_hdr));
+	hdr[1] = sizeof(noa_ie_hdr) + noa_len - 2;
+	hdr[7] = noa_len;
+
+	noa = skb_put_zero(skb, noa_len);
+
+	noa->index = avp->noa_index;
+	noa->oppps_ctwindow = ath9k_get_ctwin(sc, avp);
+	if (noa->oppps_ctwindow)
+		noa->oppps_ctwindow |= BIT(7);
+
+	if (avp->noa_duration) {
+		if (avp->periodic_noa) {
+			u32 interval = TU_TO_USEC(sc->cur_chan->beacon.beacon_interval);
+			noa->desc[i].count = 255;
+			noa->desc[i].interval = cpu_to_le32(interval);
+		} else {
+			noa->desc[i].count = 1;
+		}
+
+		noa->desc[i].start_time = cpu_to_le32(avp->noa_start);
+		noa->desc[i].duration = cpu_to_le32(avp->noa_duration);
+		i++;
+	}
+
+	if (avp->offchannel_duration) {
+		noa->desc[i].count = 1;
+		noa->desc[i].start_time = cpu_to_le32(avp->offchannel_start);
+		noa->desc[i].duration = cpu_to_le32(avp->offchannel_duration);
+	}
+}
+
+void ath9k_p2p_ps_timer(void *priv)
+{
+	struct ath_softc *sc = priv;
+	struct ath_vif *avp = sc->p2p_ps_vif;
+	struct ieee80211_vif *vif;
+	struct ieee80211_sta *sta;
+	struct ath_node *an;
+	u32 tsf;
+
+	del_timer_sync(&sc->sched.timer);
+	ath9k_hw_gen_timer_stop(sc->sc_ah, sc->p2p_ps_timer);
+	ath_chanctx_event(sc, NULL, ATH_CHANCTX_EVENT_TSF_TIMER);
+
+	if (!avp || avp->chanctx != sc->cur_chan)
+		return;
+
+	tsf = ath9k_hw_gettsf32(sc->sc_ah);
+	if (!avp->noa.absent)
+		tsf += ATH_P2P_PS_STOP_TIME;
+	else
+		tsf -= ATH_P2P_PS_STOP_TIME;
+
+	if (!avp->noa.has_next_tsf ||
+	    avp->noa.next_tsf - tsf > BIT(31))
+		ieee80211_update_p2p_noa(&avp->noa, tsf);
+
+	ath9k_update_p2p_ps_timer(sc, avp);
+
+	rcu_read_lock();
+
+	vif = avp->vif;
+	sta = ieee80211_find_sta(vif, avp->bssid);
+	if (!sta)
+		goto out;
+
+	an = (void *) sta->drv_priv;
+	if (an->sleeping == !!avp->noa.absent)
+		goto out;
+
+	an->sleeping = avp->noa.absent;
+	if (an->sleeping)
+		ath_tx_aggr_sleep(sta, sc, an);
+	else
+		ath_tx_aggr_wakeup(sc, an);
+
+out:
+	rcu_read_unlock();
+}
+
+void ath9k_p2p_bss_info_changed(struct ath_softc *sc,
+				struct ieee80211_vif *vif)
+{
+	unsigned long flags;
+
+	spin_lock_bh(&sc->sc_pcu_lock);
+	spin_lock_irqsave(&sc->sc_pm_lock, flags);
+	ath9k_update_p2p_ps(sc, vif);
+	spin_unlock_irqrestore(&sc->sc_pm_lock, flags);
+	spin_unlock_bh(&sc->sc_pcu_lock);
+}
+
+void ath9k_p2p_beacon_sync(struct ath_softc *sc)
+{
+	if (sc->p2p_ps_vif)
+		ath9k_update_p2p_ps(sc, sc->p2p_ps_vif->vif);
+}
+
+void ath9k_p2p_remove_vif(struct ath_softc *sc,
+			  struct ieee80211_vif *vif)
+{
+	struct ath_vif *avp = (void *)vif->drv_priv;
+
+	spin_lock_bh(&sc->sc_pcu_lock);
+	if (avp == sc->p2p_ps_vif) {
+		sc->p2p_ps_vif = NULL;
+		ath9k_update_p2p_ps_timer(sc, NULL);
+	}
+	spin_unlock_bh(&sc->sc_pcu_lock);
+}
+
+int ath9k_init_p2p(struct ath_softc *sc)
+{
+	sc->p2p_ps_timer = ath_gen_timer_alloc(sc->sc_ah, ath9k_p2p_ps_timer,
+					       NULL, sc, AR_FIRST_NDP_TIMER);
+	if (!sc->p2p_ps_timer)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void ath9k_deinit_p2p(struct ath_softc *sc)
+{
+	if (sc->p2p_ps_timer)
+		ath_gen_timer_free(sc->sc_ah, sc->p2p_ps_timer);
+}
+
+#endif /* CONFIG_ATH9K_CHANNEL_CONTEXT */