drivers/net/wireless/intel/iwlwifi/mvm/phy-ctxt.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
  * Copyright (C) 2012-2014, 2018-2021 Intel Corporation
  * Copyright (C) 2013-2014 Intel Mobile Communications GmbH
  * Copyright (C) 2017 Intel Deutschland GmbH
  */
 #include <net/mac80211.h>
 #include "fw-api.h"
 #include "mvm.h"

 /* Maps the driver specific channel width definition to the fw values */
 u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
 {
 	switch (chandef->width) {
 	case NL80211_CHAN_WIDTH_20_NOHT:
 	case NL80211_CHAN_WIDTH_20:
 		return PHY_VHT_CHANNEL_MODE20;
 	case NL80211_CHAN_WIDTH_40:
 		return PHY_VHT_CHANNEL_MODE40;
 	case NL80211_CHAN_WIDTH_80:
 		return PHY_VHT_CHANNEL_MODE80;
 	case NL80211_CHAN_WIDTH_160:
 		return PHY_VHT_CHANNEL_MODE160;
 	default:
 		WARN(1, "Invalid channel width=%u", chandef->width);
 		return PHY_VHT_CHANNEL_MODE20;
 	}
 }

 /*
  * Maps the driver specific control channel position (relative to the center
  * freq) definitions to the the fw values
  */
 u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
 {
 	switch (chandef->chan->center_freq - chandef->center_freq1) {
 	case -70:
 		return PHY_VHT_CTRL_POS_4_BELOW;
 	case -50:
 		return PHY_VHT_CTRL_POS_3_BELOW;
 	case -30:
 		return PHY_VHT_CTRL_POS_2_BELOW;
 	case -10:
 		return PHY_VHT_CTRL_POS_1_BELOW;
 	case  10:
 		return PHY_VHT_CTRL_POS_1_ABOVE;
 	case  30:
 		return PHY_VHT_CTRL_POS_2_ABOVE;
 	case  50:
 		return PHY_VHT_CTRL_POS_3_ABOVE;
 	case  70:
 		return PHY_VHT_CTRL_POS_4_ABOVE;
 	default:
 		WARN(1, "Invalid channel definition");
 		fallthrough;
 	case 0:
 		/*
 		 * The FW is expected to check the control channel position only
 		 * when in HT/VHT and the channel width is not 20MHz. Return
 		 * this value as the default one.
 		 */
 		return PHY_VHT_CTRL_POS_1_BELOW;
 	}
 }

 /*
  * Construct the generic fields of the PHY context command
  */
 static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
 				     struct iwl_phy_context_cmd *cmd,
 				     u32 action)
 {
 	cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
 							    ctxt->color));
 	cmd->action = cpu_to_le32(action);
 }

 static void iwl_mvm_phy_ctxt_set_rxchain(struct iwl_mvm *mvm,
 					 struct iwl_mvm_phy_ctxt *ctxt,
 					 __le32 *rxchain_info,
 					 u8 chains_static,
 					 u8 chains_dynamic)
 {
 	u8 active_cnt, idle_cnt;

 	/* Set rx the chains */
 	idle_cnt = chains_static;
 	active_cnt = chains_dynamic;

 	/* In scenarios where we only ever use a single-stream rates,
 	 * i.e. legacy 11b/g/a associations, single-stream APs or even
 	 * static SMPS, enable both chains to get diversity, improving
 	 * the case where we're far enough from the AP that attenuation
 	 * between the two antennas is sufficiently different to impact
 	 * performance.
 	 */
 	if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm, ctxt)) {
 		idle_cnt = 2;
 		active_cnt = 2;
 	}

 	/*
 	 * If the firmware requested it, then we know that it supports
 	 * getting zero for the values to indicate "use one, but pick
 	 * which one yourself", which means it can dynamically pick one
 	 * that e.g. has better RSSI.
 	 */
 	if (mvm->fw_static_smps_request && active_cnt == 1 && idle_cnt == 1) {
 		idle_cnt = 0;
 		active_cnt = 0;
 	}

 	*rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
 					PHY_RX_CHAIN_VALID_POS);
 	*rxchain_info |= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
 	*rxchain_info |= cpu_to_le32(active_cnt <<
 					 PHY_RX_CHAIN_MIMO_CNT_POS);
 #ifdef CONFIG_IWLWIFI_DEBUGFS
 	if (unlikely(mvm->dbgfs_rx_phyinfo))
 		*rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
 #endif
 }

 /*
  * Add the phy configuration to the PHY context command
  */
 static void iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm *mvm,
 					 struct iwl_mvm_phy_ctxt *ctxt,
 					 struct iwl_phy_context_cmd_v1 *cmd,
 					 struct cfg80211_chan_def *chandef,
 					 u8 chains_static, u8 chains_dynamic)
 {
 	struct iwl_phy_context_cmd_tail *tail =
 		iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);

 	/* Set the channel info data */
 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);

 	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &tail->rxchain_info,
 				     chains_static, chains_dynamic);

 	tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
 }

 /*
  * Add the phy configuration to the PHY context command
  */
 static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
 				      struct iwl_mvm_phy_ctxt *ctxt,
 				      struct iwl_phy_context_cmd *cmd,
 				      struct cfg80211_chan_def *chandef,
 				      u8 chains_static, u8 chains_dynamic)
 {
 	cmd->lmac_id = cpu_to_le32(iwl_mvm_get_lmac_id(mvm->fw,
 						       chandef->chan->band));

 	/* Set the channel info data */
 	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);

 	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd->rxchain_info,
 				     chains_static, chains_dynamic);
 }

 /*
  * Send a command to apply the current phy configuration. The command is send
  * only if something in the configuration changed: in case that this is the
  * first time that the phy configuration is applied or in case that the phy
  * configuration changed from the previous apply.
  */
 static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
 				  struct iwl_mvm_phy_ctxt *ctxt,
 				  struct cfg80211_chan_def *chandef,
 				  u8 chains_static, u8 chains_dynamic,
 				  u32 action)
 {
 	int ret;
 	int ver = iwl_fw_lookup_cmd_ver(mvm->fw, IWL_ALWAYS_LONG_GROUP,
 					PHY_CONTEXT_CMD, 1);

 	if (ver == 3) {
 		struct iwl_phy_context_cmd cmd = {};

 		/* Set the command header fields */
 		iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action);

 		/* Set the command data */
 		iwl_mvm_phy_ctxt_cmd_data(mvm, ctxt, &cmd, chandef,
 					  chains_static,
 					  chains_dynamic);

 		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
 					   0, sizeof(cmd), &cmd);
 	} else if (ver < 3) {
 		struct iwl_phy_context_cmd_v1 cmd = {};
 		u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);

 		/* Set the command header fields */
 		iwl_mvm_phy_ctxt_cmd_hdr(ctxt,
 					 (struct iwl_phy_context_cmd *)&cmd,
 					 action);

 		/* Set the command data */
 		iwl_mvm_phy_ctxt_cmd_data_v1(mvm, ctxt, &cmd, chandef,
 					     chains_static,
 					     chains_dynamic);
 		ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
 					   0, len, &cmd);
 	} else {
 		IWL_ERR(mvm, "PHY ctxt cmd error ver %d not supported\n", ver);
 		return -EOPNOTSUPP;
 	}


 	if (ret)
 		IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
 	return ret;
 }

 /*
  * Send a command to add a PHY context based on the current HW configuration.
  */
 int iwl_mvm_phy_ctxt_add(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 			 struct cfg80211_chan_def *chandef,
 			 u8 chains_static, u8 chains_dynamic)
 {
 	WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
 		ctxt->ref);
 	lockdep_assert_held(&mvm->mutex);

 	ctxt->channel = chandef->chan;

 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 				      chains_static, chains_dynamic,
 				      FW_CTXT_ACTION_ADD);
 }

 /*
  * Update the number of references to the given PHY context. This is valid only
  * in case the PHY context was already created, i.e., its reference count > 0.
  */
 void iwl_mvm_phy_ctxt_ref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 {
 	lockdep_assert_held(&mvm->mutex);
 	ctxt->ref++;
 }

 /*
  * Send a command to modify the PHY context based on the current HW
  * configuration. Note that the function does not check that the configuration
  * changed.
  */
 int iwl_mvm_phy_ctxt_changed(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt,
 			     struct cfg80211_chan_def *chandef,
 			     u8 chains_static, u8 chains_dynamic)
 {
 	enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;

 	lockdep_assert_held(&mvm->mutex);

 	if (fw_has_capa(&mvm->fw->ucode_capa,
 			IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
 	    ctxt->channel->band != chandef->chan->band) {
 		int ret;

 		/* ... remove it here ...*/
 		ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 					     chains_static, chains_dynamic,
 					     FW_CTXT_ACTION_REMOVE);
 		if (ret)
 			return ret;

 		/* ... and proceed to add it again */
 		action = FW_CTXT_ACTION_ADD;
 	}

 	ctxt->channel = chandef->chan;
 	ctxt->width = chandef->width;
 	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
 				      chains_static, chains_dynamic,
 				      action);
 }

 void iwl_mvm_phy_ctxt_unref(struct iwl_mvm *mvm, struct iwl_mvm_phy_ctxt *ctxt)
 {
 	lockdep_assert_held(&mvm->mutex);

 	if (WARN_ON_ONCE(!ctxt))
 		return;

 	ctxt->ref--;

 	/*
 	 * Move unused phy's to a default channel. When the phy is moved the,
 	 * fw will cleanup immediate quiet bit if it was previously set,
 	 * otherwise we might not be able to reuse this phy.
 	 */
 	if (ctxt->ref == 0) {
 		struct ieee80211_channel *chan;
 		struct cfg80211_chan_def chandef;
 		struct ieee80211_supported_band *sband = NULL;
 		enum nl80211_band band = NL80211_BAND_2GHZ;

 		while (!sband && band < NUM_NL80211_BANDS)
 			sband = mvm->hw->wiphy->bands[band++];

 		if (WARN_ON(!sband))
 			return;

 		chan = &sband->channels[0];

 		cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
 		iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
 	}
 }

 static void iwl_mvm_binding_iterator(void *_data, u8 *mac,
 				     struct ieee80211_vif *vif)
 {
 	unsigned long *data = _data;
 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

 	if (!mvmvif->phy_ctxt)
 		return;

 	if (vif->type == NL80211_IFTYPE_STATION ||
 	    vif->type == NL80211_IFTYPE_AP)
 		__set_bit(mvmvif->phy_ctxt->id, data);
 }

 int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
 {
 	unsigned long phy_ctxt_counter = 0;

 	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
 						   IEEE80211_IFACE_ITER_NORMAL,
 						   iwl_mvm_binding_iterator,
 						   &phy_ctxt_counter);

 	return hweight8(phy_ctxt_counter);
 }
	// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
	/*
	* Copyright (C) 2012-2014, 2018-2021 Intel Corporation
	* Copyright (C) 2013-2014 Intel Mobile Communications GmbH
	* Copyright (C) 2017 Intel Deutschland GmbH
	*/
	#include <net/mac80211.h>
	#include "fw-api.h"
	#include "mvm.h"

	/* Maps the driver specific channel width definition to the fw values */
	u8 iwl_mvm_get_channel_width(struct cfg80211_chan_def *chandef)
	{
	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
	return PHY_VHT_CHANNEL_MODE20;
	case NL80211_CHAN_WIDTH_40:
	return PHY_VHT_CHANNEL_MODE40;
	case NL80211_CHAN_WIDTH_80:
	return PHY_VHT_CHANNEL_MODE80;
	case NL80211_CHAN_WIDTH_160:
	return PHY_VHT_CHANNEL_MODE160;
	default:
	WARN(1, "Invalid channel width=%u", chandef->width);
	return PHY_VHT_CHANNEL_MODE20;
	}
	}

	/*
	* Maps the driver specific control channel position (relative to the center
	* freq) definitions to the the fw values
	*/
	u8 iwl_mvm_get_ctrl_pos(struct cfg80211_chan_def *chandef)
	{
	switch (chandef->chan->center_freq - chandef->center_freq1) {
	case -70:
	return PHY_VHT_CTRL_POS_4_BELOW;
	case -50:
	return PHY_VHT_CTRL_POS_3_BELOW;
	case -30:
	return PHY_VHT_CTRL_POS_2_BELOW;
	case -10:
	return PHY_VHT_CTRL_POS_1_BELOW;
	case 10:
	return PHY_VHT_CTRL_POS_1_ABOVE;
	case 30:
	return PHY_VHT_CTRL_POS_2_ABOVE;
	case 50:
	return PHY_VHT_CTRL_POS_3_ABOVE;
	case 70:
	return PHY_VHT_CTRL_POS_4_ABOVE;
	default:
	WARN(1, "Invalid channel definition");
	fallthrough;
	case 0:
	/*
	* The FW is expected to check the control channel position only
	* when in HT/VHT and the channel width is not 20MHz. Return
	* this value as the default one.
	*/
	return PHY_VHT_CTRL_POS_1_BELOW;
	}
	}

	/*
	* Construct the generic fields of the PHY context command
	*/
	static void iwl_mvm_phy_ctxt_cmd_hdr(struct iwl_mvm_phy_ctxt *ctxt,
	struct iwl_phy_context_cmd *cmd,
	u32 action)
	{
	cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(ctxt->id,
	ctxt->color));
	cmd->action = cpu_to_le32(action);
	}

	static void iwl_mvm_phy_ctxt_set_rxchain(struct iwl_mvm *mvm,
	struct iwl_mvm_phy_ctxt *ctxt,
	__le32 *rxchain_info,
	u8 chains_static,
	u8 chains_dynamic)
	{
	u8 active_cnt, idle_cnt;

	/* Set rx the chains */
	idle_cnt = chains_static;
	active_cnt = chains_dynamic;

	/* In scenarios where we only ever use a single-stream rates,
	* i.e. legacy 11b/g/a associations, single-stream APs or even
	* static SMPS, enable both chains to get diversity, improving
	* the case where we're far enough from the AP that attenuation
	* between the two antennas is sufficiently different to impact
	* performance.
	*/
	if (active_cnt == 1 && iwl_mvm_rx_diversity_allowed(mvm, ctxt)) {
	idle_cnt = 2;
	active_cnt = 2;
	}

	/*
	* If the firmware requested it, then we know that it supports
	* getting zero for the values to indicate "use one, but pick
	* which one yourself", which means it can dynamically pick one
	* that e.g. has better RSSI.
	*/
	if (mvm->fw_static_smps_request && active_cnt == 1 && idle_cnt == 1) {
	idle_cnt = 0;
	active_cnt = 0;
	}

	*rxchain_info = cpu_to_le32(iwl_mvm_get_valid_rx_ant(mvm) <<
	PHY_RX_CHAIN_VALID_POS);
	*rxchain_info \|= cpu_to_le32(idle_cnt << PHY_RX_CHAIN_CNT_POS);
	*rxchain_info \|= cpu_to_le32(active_cnt <<
	PHY_RX_CHAIN_MIMO_CNT_POS);
	#ifdef CONFIG_IWLWIFI_DEBUGFS
	if (unlikely(mvm->dbgfs_rx_phyinfo))
	*rxchain_info = cpu_to_le32(mvm->dbgfs_rx_phyinfo);
	#endif
	}

	/*
	* Add the phy configuration to the PHY context command
	*/
	static void iwl_mvm_phy_ctxt_cmd_data_v1(struct iwl_mvm *mvm,
	struct iwl_mvm_phy_ctxt *ctxt,
	struct iwl_phy_context_cmd_v1 *cmd,
	struct cfg80211_chan_def *chandef,
	u8 chains_static, u8 chains_dynamic)
	{
	struct iwl_phy_context_cmd_tail *tail =
	iwl_mvm_chan_info_cmd_tail(mvm, &cmd->ci);

	/* Set the channel info data */
	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);

	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &tail->rxchain_info,
	chains_static, chains_dynamic);

	tail->txchain_info = cpu_to_le32(iwl_mvm_get_valid_tx_ant(mvm));
	}

	/*
	* Add the phy configuration to the PHY context command
	*/
	static void iwl_mvm_phy_ctxt_cmd_data(struct iwl_mvm *mvm,
	struct iwl_mvm_phy_ctxt *ctxt,
	struct iwl_phy_context_cmd *cmd,
	struct cfg80211_chan_def *chandef,
	u8 chains_static, u8 chains_dynamic)
	{
	cmd->lmac_id = cpu_to_le32(iwl_mvm_get_lmac_id(mvm->fw,
	chandef->chan->band));

	/* Set the channel info data */
	iwl_mvm_set_chan_info_chandef(mvm, &cmd->ci, chandef);

	iwl_mvm_phy_ctxt_set_rxchain(mvm, ctxt, &cmd->rxchain_info,
	chains_static, chains_dynamic);
	}

	/*
	* Send a command to apply the current phy configuration. The command is send
	* only if something in the configuration changed: in case that this is the
	* first time that the phy configuration is applied or in case that the phy
	* configuration changed from the previous apply.
	*/
	static int iwl_mvm_phy_ctxt_apply(struct iwl_mvm *mvm,
	struct iwl_mvm_phy_ctxt *ctxt,
	struct cfg80211_chan_def *chandef,
	u8 chains_static, u8 chains_dynamic,
	u32 action)
	{
	int ret;
	int ver = iwl_fw_lookup_cmd_ver(mvm->fw, IWL_ALWAYS_LONG_GROUP,
	PHY_CONTEXT_CMD, 1);

	if (ver == 3) {
	struct iwl_phy_context_cmd cmd = {};

	/* Set the command header fields */
	iwl_mvm_phy_ctxt_cmd_hdr(ctxt, &cmd, action);

	/* Set the command data */
	iwl_mvm_phy_ctxt_cmd_data(mvm, ctxt, &cmd, chandef,
	chains_static,
	chains_dynamic);

	ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
	0, sizeof(cmd), &cmd);
	} else if (ver < 3) {
	struct iwl_phy_context_cmd_v1 cmd = {};
	u16 len = sizeof(cmd) - iwl_mvm_chan_info_padding(mvm);

	/* Set the command header fields */
	iwl_mvm_phy_ctxt_cmd_hdr(ctxt,
	(struct iwl_phy_context_cmd *)&cmd,
	action);

	/* Set the command data */
	iwl_mvm_phy_ctxt_cmd_data_v1(mvm, ctxt, &cmd, chandef,
	chains_static,
	chains_dynamic);
	ret = iwl_mvm_send_cmd_pdu(mvm, PHY_CONTEXT_CMD,
	0, len, &cmd);
	} else {
	IWL_ERR(mvm, "PHY ctxt cmd error ver %d not supported\n", ver);
	return -EOPNOTSUPP;
	}


	if (ret)
	IWL_ERR(mvm, "PHY ctxt cmd error. ret=%d\n", ret);
	return ret;
	}

	/*
	* Send a command to add a PHY context based on the current HW configuration.
	*/
	int iwl_mvm_phy_ctxt_add(struct iwl_mvm mvm, struct iwl_mvm_phy_ctxt ctxt,
	struct cfg80211_chan_def *chandef,
	u8 chains_static, u8 chains_dynamic)
	{
	WARN_ON(!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status) &&
	ctxt->ref);
	lockdep_assert_held(&mvm->mutex);

	ctxt->channel = chandef->chan;

	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
	chains_static, chains_dynamic,
	FW_CTXT_ACTION_ADD);
	}

	/*
	* Update the number of references to the given PHY context. This is valid only
	* in case the PHY context was already created, i.e., its reference count > 0.
	*/
	void iwl_mvm_phy_ctxt_ref(struct iwl_mvm mvm, struct iwl_mvm_phy_ctxt ctxt)
	{
	lockdep_assert_held(&mvm->mutex);
	ctxt->ref++;
	}

	/*
	* Send a command to modify the PHY context based on the current HW
	* configuration. Note that the function does not check that the configuration
	* changed.
	*/
	int iwl_mvm_phy_ctxt_changed(struct iwl_mvm mvm, struct iwl_mvm_phy_ctxt ctxt,
	struct cfg80211_chan_def *chandef,
	u8 chains_static, u8 chains_dynamic)
	{
	enum iwl_ctxt_action action = FW_CTXT_ACTION_MODIFY;

	lockdep_assert_held(&mvm->mutex);

	if (fw_has_capa(&mvm->fw->ucode_capa,
	IWL_UCODE_TLV_CAPA_BINDING_CDB_SUPPORT) &&
	ctxt->channel->band != chandef->chan->band) {
	int ret;

	/* ... remove it here ...*/
	ret = iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
	chains_static, chains_dynamic,
	FW_CTXT_ACTION_REMOVE);
	if (ret)
	return ret;

	/* ... and proceed to add it again */
	action = FW_CTXT_ACTION_ADD;
	}

	ctxt->channel = chandef->chan;
	ctxt->width = chandef->width;
	return iwl_mvm_phy_ctxt_apply(mvm, ctxt, chandef,
	chains_static, chains_dynamic,
	action);
	}

	void iwl_mvm_phy_ctxt_unref(struct iwl_mvm mvm, struct iwl_mvm_phy_ctxt ctxt)
	{
	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON_ONCE(!ctxt))
	return;

	ctxt->ref--;

	/*
	* Move unused phy's to a default channel. When the phy is moved the,
	* fw will cleanup immediate quiet bit if it was previously set,
	* otherwise we might not be able to reuse this phy.
	*/
	if (ctxt->ref == 0) {
	struct ieee80211_channel *chan;
	struct cfg80211_chan_def chandef;
	struct ieee80211_supported_band *sband = NULL;
	enum nl80211_band band = NL80211_BAND_2GHZ;

	while (!sband && band < NUM_NL80211_BANDS)
	sband = mvm->hw->wiphy->bands[band++];

	if (WARN_ON(!sband))
	return;

	chan = &sband->channels[0];

	cfg80211_chandef_create(&chandef, chan, NL80211_CHAN_NO_HT);
	iwl_mvm_phy_ctxt_changed(mvm, ctxt, &chandef, 1, 1);
	}
	}

	static void iwl_mvm_binding_iterator(void _data, u8 mac,
	struct ieee80211_vif *vif)
	{
	unsigned long *data = _data;
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);

	if (!mvmvif->phy_ctxt)
	return;

	if (vif->type == NL80211_IFTYPE_STATION \|\|
	vif->type == NL80211_IFTYPE_AP)
	__set_bit(mvmvif->phy_ctxt->id, data);
	}

	int iwl_mvm_phy_ctx_count(struct iwl_mvm *mvm)
	{
	unsigned long phy_ctxt_counter = 0;

	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
	IEEE80211_IFACE_ITER_NORMAL,
	iwl_mvm_binding_iterator,
	&phy_ctxt_counter);

	return hweight8(phy_ctxt_counter);
	}