diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/datapath.h b/drivers/net/wireless/intel/iwlwifi/fw/api/datapath.h
index b472f08b06e6..d299bba3aa54 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/api/datapath.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/datapath.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
- * Copyright (C) 2012-2014, 2018-2019 Intel Corporation
+ * Copyright (C) 2012-2014, 2018-2020 Intel Corporation
  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
  * Copyright (C) 2016-2017 Intel Deutschland GmbH
  */
@@ -52,6 +52,12 @@ enum iwl_data_path_subcmd_ids {
 	 */
 	CHEST_COLLECTOR_FILTER_CONFIG_CMD = 0x14,
 
+	/**
+	 * @MONITOR_NOTIF: Datapath monitoring notification, using
+	 *	&struct iwl_datapath_monitor_notif
+	 */
+	MONITOR_NOTIF = 0xF4,
+
 	/**
 	 * @RX_NO_DATA_NOTIF: &struct iwl_rx_no_data
 	 */
@@ -153,4 +159,14 @@ struct iwl_channel_estimation_cfg {
 	__le64 frame_types;
 } __packed; /* CHEST_COLLECTOR_FILTER_CMD_API_S_VER_1 */
 
+enum iwl_datapath_monitor_notif_type {
+	IWL_DP_MON_NOTIF_TYPE_EXT_CCA,
+};
+
+struct iwl_datapath_monitor_notif {
+	__le32 type;
+	u8 mac_id;
+	u8 reserved[3];
+} __packed; /* MONITOR_NTF_API_S_VER_1 */
+
 #endif /* __iwl_fw_api_datapath_h__ */
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
index da32937ba9a7..b323e44fb565 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c
@@ -3009,6 +3009,39 @@ static void iwl_mvm_check_he_obss_narrow_bw_ru(struct ieee80211_hw *hw,
 	mvmvif->he_ru_2mhz_block = !iter_data.tolerated;
 }
 
+static void iwl_mvm_reset_cca_40mhz_workaround(struct iwl_mvm *mvm,
+					       struct ieee80211_vif *vif)
+{
+	struct ieee80211_supported_band *sband;
+	const struct ieee80211_sta_he_cap *he_cap;
+
+	if (vif->type != NL80211_IFTYPE_STATION)
+		return;
+
+	if (!mvm->cca_40mhz_workaround)
+		return;
+
+	/* decrement and check that we reached zero */
+	mvm->cca_40mhz_workaround--;
+	if (mvm->cca_40mhz_workaround)
+		return;
+
+	sband = mvm->hw->wiphy->bands[NL80211_BAND_2GHZ];
+
+	sband->ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+
+	he_cap = ieee80211_get_he_iftype_cap(sband,
+					     ieee80211_vif_type_p2p(vif));
+
+	if (he_cap) {
+		/* we know that ours is writable */
+		struct ieee80211_sta_he_cap *he = (void *)he_cap;
+
+		he->he_cap_elem.phy_cap_info[0] |=
+			IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G;
+	}
+}
+
 static int iwl_mvm_mac_sta_state(struct ieee80211_hw *hw,
 				 struct ieee80211_vif *vif,
 				 struct ieee80211_sta *sta,
@@ -3048,6 +3081,12 @@ static int iwl_mvm_mac_sta_state(struct ieee80211_hw *hw,
 		 * No need to make sure deferred TX indication is off since the
 		 * worker will already remove it if it was on
 		 */
+
+		/*
+		 * Additionally, reset the 40 MHz capability if we disconnected
+		 * from the AP now.
+		 */
+		iwl_mvm_reset_cca_40mhz_workaround(mvm, vif);
 	}
 
 	mutex_lock(&mvm->mutex);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
index 28b118f3d73d..e13fe0e0025f 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h
@@ -796,6 +796,8 @@ struct iwl_mvm {
 	bool hw_registered;
 	bool rfkill_safe_init_done;
 
+	u8 cca_40mhz_workaround;
+
 	u32 ampdu_ref;
 	bool ampdu_toggle;
 
@@ -1998,6 +2000,7 @@ void iwl_mvm_sync_rx_queues_internal(struct iwl_mvm *mvm,
 				     u32 size);
 void iwl_mvm_reorder_timer_expired(struct timer_list *t);
 struct ieee80211_vif *iwl_mvm_get_bss_vif(struct iwl_mvm *mvm);
+struct ieee80211_vif *iwl_mvm_get_vif_by_macid(struct iwl_mvm *mvm, u32 macid);
 bool iwl_mvm_is_vif_assoc(struct iwl_mvm *mvm);
 
 #define MVM_TCM_PERIOD_MSEC 500
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index 27527a3440af..a1c7572285dc 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -146,6 +146,70 @@ static void iwl_mvm_nic_config(struct iwl_op_mode *op_mode)
 				       ~APMG_PS_CTRL_EARLY_PWR_OFF_RESET_DIS);
 }
 
+static void iwl_mvm_rx_monitor_notif(struct iwl_mvm *mvm,
+				     struct iwl_rx_cmd_buffer *rxb)
+{
+	struct iwl_rx_packet *pkt = rxb_addr(rxb);
+	struct iwl_datapath_monitor_notif *notif = (void *)pkt->data;
+	struct ieee80211_supported_band *sband;
+	const struct ieee80211_sta_he_cap *he_cap;
+	struct ieee80211_vif *vif;
+
+	if (notif->type != cpu_to_le32(IWL_DP_MON_NOTIF_TYPE_EXT_CCA))
+		return;
+
+	vif = iwl_mvm_get_vif_by_macid(mvm, notif->mac_id);
+	if (!vif || vif->type != NL80211_IFTYPE_STATION)
+		return;
+
+	if (!vif->bss_conf.chandef.chan ||
+	    vif->bss_conf.chandef.chan->band != NL80211_BAND_2GHZ ||
+	    vif->bss_conf.chandef.width < NL80211_CHAN_WIDTH_40)
+		return;
+
+	if (!vif->bss_conf.assoc)
+		return;
+
+	/* this shouldn't happen *again*, ignore it */
+	if (mvm->cca_40mhz_workaround)
+		return;
+
+	/*
+	 * We'll decrement this on disconnect - so set to 2 since we'll
+	 * still have to disconnect from the current AP first.
+	 */
+	mvm->cca_40mhz_workaround = 2;
+
+	/*
+	 * This capability manipulation isn't really ideal, but it's the
+	 * easiest choice - otherwise we'd have to do some major changes
+	 * in mac80211 to support this, which isn't worth it. This does
+	 * mean that userspace may have outdated information, but that's
+	 * actually not an issue at all.
+	 */
+	sband = mvm->hw->wiphy->bands[NL80211_BAND_2GHZ];
+
+	WARN_ON(!sband->ht_cap.ht_supported);
+	WARN_ON(!(sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40));
+	sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+
+	he_cap = ieee80211_get_he_iftype_cap(sband,
+					     ieee80211_vif_type_p2p(vif));
+
+	if (he_cap) {
+		/* we know that ours is writable */
+		struct ieee80211_sta_he_cap *he = (void *)he_cap;
+
+		WARN_ON(!he->has_he);
+		WARN_ON(!(he->he_cap_elem.phy_cap_info[0] &
+				IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G));
+		he->he_cap_elem.phy_cap_info[0] &=
+			~IEEE80211_HE_PHY_CAP0_CHANNEL_WIDTH_SET_40MHZ_IN_2G;
+	}
+
+	ieee80211_disconnect(vif, true);
+}
+
 /**
  * enum iwl_rx_handler_context context for Rx handler
  * @RX_HANDLER_SYNC : this means that it will be called in the Rx path
@@ -291,6 +355,9 @@ static const struct iwl_rx_handlers iwl_mvm_rx_handlers[] = {
 	RX_HANDLER_GRP(MAC_CONF_GROUP, CHANNEL_SWITCH_NOA_NOTIF,
 		       iwl_mvm_channel_switch_noa_notif,
 		       RX_HANDLER_SYNC, struct iwl_channel_switch_noa_notif),
+	RX_HANDLER_GRP(DATA_PATH_GROUP, MONITOR_NOTIF,
+		       iwl_mvm_rx_monitor_notif, RX_HANDLER_ASYNC_LOCKED,
+		       struct iwl_datapath_monitor_notif),
 };
 #undef RX_HANDLER
 #undef RX_HANDLER_GRP
@@ -435,6 +502,7 @@ static const struct iwl_hcmd_names iwl_mvm_data_path_names[] = {
 	HCMD_NAME(RFH_QUEUE_CONFIG_CMD),
 	HCMD_NAME(TLC_MNG_CONFIG_CMD),
 	HCMD_NAME(CHEST_COLLECTOR_FILTER_CONFIG_CMD),
+	HCMD_NAME(MONITOR_NOTIF),
 	HCMD_NAME(STA_PM_NOTIF),
 	HCMD_NAME(MU_GROUP_MGMT_NOTIF),
 	HCMD_NAME(RX_QUEUES_NOTIFICATION),
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/utils.c b/drivers/net/wireless/intel/iwlwifi/mvm/utils.c
index ee2e0cb47584..cf1bee04041a 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/utils.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/utils.c
@@ -832,6 +832,36 @@ struct ieee80211_vif *iwl_mvm_get_bss_vif(struct iwl_mvm *mvm)
 	return bss_iter_data.vif;
 }
 
+struct iwl_bss_find_iter_data {
+	struct ieee80211_vif *vif;
+	u32 macid;
+};
+
+static void iwl_mvm_bss_find_iface_iterator(void *_data, u8 *mac,
+					    struct ieee80211_vif *vif)
+{
+	struct iwl_bss_find_iter_data *data = _data;
+	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
+
+	if (mvmvif->id == data->macid)
+		data->vif = vif;
+}
+
+struct ieee80211_vif *iwl_mvm_get_vif_by_macid(struct iwl_mvm *mvm, u32 macid)
+{
+	struct iwl_bss_find_iter_data data = {
+		.macid = macid,
+	};
+
+	lockdep_assert_held(&mvm->mutex);
+
+	ieee80211_iterate_active_interfaces_atomic(
+		mvm->hw, IEEE80211_IFACE_ITER_NORMAL,
+		iwl_mvm_bss_find_iface_iterator, &data);
+
+	return data.vif;
+}
+
 struct iwl_sta_iter_data {
 	bool assoc;
 };