iwlwifi: mvm: rs - don't use the shared antenna when BT load is high

When we need only one antenna, we should refrain from using
the antenna that is shared with BT if BT load is high.
Fix this.

Reviewed-by: Eyal Shapira <eyal@wizery.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/iwlwifi/mvm/coex.c

@@ -1137,6 +1137,22 @@ bool iwl_mvm_bt_coex_is_mimo_allowed(struct iwl_mvm *mvm,
 	return lut_type != BT_COEX_LOOSE_LUT;
 }
 
+bool iwl_mvm_bt_coex_is_ant_avail(struct iwl_mvm *mvm, u8 ant)
+{
+	/* there is no other antenna, shared antenna is always available */
+	if (mvm->cfg->bt_shared_single_ant)
+		return true;
+
+	if (ant & mvm->cfg->non_shared_ant)
+		return true;
+
+	if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_BT_COEX_SPLIT))
+		return iwl_mvm_bt_coex_is_shared_ant_avail_old(mvm);
+
+	return le32_to_cpu(mvm->last_bt_notif.bt_activity_grading) <
+		BT_HIGH_TRAFFIC;
+}
+
 bool iwl_mvm_bt_coex_is_shared_ant_avail(struct iwl_mvm *mvm)
 {
 	/* there is no other antenna, shared antenna is always available */

drivers/net/wireless/iwlwifi/mvm/coex_legacy.c

@@ -1156,6 +1156,12 @@ bool iwl_mvm_bt_coex_is_mimo_allowed_old(struct iwl_mvm *mvm,
 	return lut_type != BT_COEX_LOOSE_LUT;
 }
 
+bool iwl_mvm_bt_coex_is_ant_avail_old(struct iwl_mvm *mvm, u8 ant)
+{
+	u32 ag = le32_to_cpu(mvm->last_bt_notif_old.bt_activity_grading);
+	return ag < BT_HIGH_TRAFFIC;
+}
+
 bool iwl_mvm_bt_coex_is_shared_ant_avail_old(struct iwl_mvm *mvm)
 {
 	u32 ag = le32_to_cpu(mvm->last_bt_notif_old.bt_activity_grading);

drivers/net/wireless/iwlwifi/mvm/mvm.h

@@ -1086,12 +1086,14 @@ u16 iwl_mvm_coex_agg_time_limit(struct iwl_mvm *mvm,
 				struct ieee80211_sta *sta);
 bool iwl_mvm_bt_coex_is_mimo_allowed(struct iwl_mvm *mvm,
 				     struct ieee80211_sta *sta);
+bool iwl_mvm_bt_coex_is_ant_avail(struct iwl_mvm *mvm, u8 ant);
 bool iwl_mvm_bt_coex_is_shared_ant_avail(struct iwl_mvm *mvm);
 bool iwl_mvm_bt_coex_is_tpc_allowed(struct iwl_mvm *mvm,
 				    enum ieee80211_band band);
 u8 iwl_mvm_bt_coex_tx_prio(struct iwl_mvm *mvm, struct ieee80211_hdr *hdr,
 			   struct ieee80211_tx_info *info, u8 ac);
 
+bool iwl_mvm_bt_coex_is_ant_avail_old(struct iwl_mvm *mvm, u8 ant);
 bool iwl_mvm_bt_coex_is_shared_ant_avail_old(struct iwl_mvm *mvm);
 void iwl_mvm_bt_coex_vif_change_old(struct iwl_mvm *mvm);
 int iwl_send_bt_init_conf_old(struct iwl_mvm *mvm);

drivers/net/wireless/iwlwifi/mvm/rs.c

@@ -158,6 +158,12 @@ struct rs_tx_column {
 	allow_column_func_t checks[MAX_COLUMN_CHECKS];
 };
 
+static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
+			 struct iwl_scale_tbl_info *tbl)
+{
+	return iwl_mvm_bt_coex_is_ant_avail(mvm, tbl->rate.ant);
+}
+
 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 			  struct iwl_scale_tbl_info *tbl)
 {
@@ -218,6 +224,9 @@ static const struct rs_tx_column rs_tx_columns[] = {
 			RS_COLUMN_INVALID,
 			RS_COLUMN_INVALID,
 		},
+		.checks = {
+			rs_ant_allow,
+		},
 	},
 	[RS_COLUMN_LEGACY_ANT_B] = {
 		.mode = RS_LEGACY,
@@ -231,6 +240,9 @@ static const struct rs_tx_column rs_tx_columns[] = {
 			RS_COLUMN_INVALID,
 			RS_COLUMN_INVALID,
 		},
+		.checks = {
+			rs_ant_allow,
+		},
 	},
 	[RS_COLUMN_SISO_ANT_A] = {
 		.mode = RS_SISO,
@@ -246,6 +258,7 @@ static const struct rs_tx_column rs_tx_columns[] = {
 		},
 		.checks = {
 			rs_siso_allow,
+			rs_ant_allow,
 		},
 	},
 	[RS_COLUMN_SISO_ANT_B] = {
@@ -262,6 +275,7 @@ static const struct rs_tx_column rs_tx_columns[] = {
 		},
 		.checks = {
 			rs_siso_allow,
+			rs_ant_allow,
 		},
 	},
 	[RS_COLUMN_SISO_ANT_A_SGI] = {
@@ -279,6 +293,7 @@ static const struct rs_tx_column rs_tx_columns[] = {
 		},
 		.checks = {
 			rs_siso_allow,
+			rs_ant_allow,
 			rs_sgi_allow,
 		},
 	},
@@ -297,6 +312,7 @@ static const struct rs_tx_column rs_tx_columns[] = {
 		},
 		.checks = {
 			rs_siso_allow,
+			rs_ant_allow,
 			rs_sgi_allow,
 		},
 	},