iwlagn: keep BT settings across restart

The BT SCO needs to be re-applied to the device,
while the traffic load just needs to be correct
in software.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-6000.c

@@ -241,6 +241,22 @@ static void iwl6000g2b_send_bt_config(struct iwl_priv *priv)
 
 	if (iwl_send_cmd_pdu(priv, REPLY_BT_CONFIG, sizeof(bt_cmd), &bt_cmd))
 		IWL_ERR(priv, "failed to send BT Coex Config\n");
+
+	/*
+	 * When we are doing a restart, need to also reconfigure BT
+	 * SCO to the device. If not doing a restart, bt_sco_active
+	 * will always be false, so there's no need to have an extra
+	 * variable to check for it.
+	 */
+	if (priv->bt_sco_active) {
+		struct iwl6000g2b_bt_sco_cmd sco_cmd = { .flags = 0 };
+
+		if (priv->bt_sco_active)
+			sco_cmd.flags |= IWL6000G2B_BT_SCO_ACTIVE;
+		if (iwl_send_cmd_pdu(priv, REPLY_BT_COEX_SCO,
+				     sizeof(sco_cmd), &sco_cmd))
+			IWL_ERR(priv, "failed to send BT SCO command\n");
+	}
 }
 
 static struct iwl_sensitivity_ranges iwl6000_sensitivity = {

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -3079,10 +3079,30 @@ static void iwl_bg_restart(struct work_struct *data)
 		return;
 
 	if (test_and_clear_bit(STATUS_FW_ERROR, &priv->status)) {
+		bool bt_sco;
+		u8 bt_load;
+
 		mutex_lock(&priv->mutex);
 		priv->vif = NULL;
 		priv->is_open = 0;
+
+		/*
+		 * __iwl_down() will clear the BT status variables,
+		 * which is correct, but when we restart we really
+		 * want to keep them so restore them afterwards.
+		 *
+		 * The restart process will later pick them up and
+		 * re-configure the hw when we reconfigure the BT
+		 * command.
+		 */
+		bt_sco = priv->bt_sco_active;
+		bt_load = priv->bt_traffic_load;
+
 		__iwl_down(priv);
+
+		priv->bt_sco_active = bt_sco;
+		priv->bt_traffic_load = bt_load;
+
 		mutex_unlock(&priv->mutex);
 		iwl_cancel_deferred_work(priv);
 		ieee80211_restart_hw(priv->hw);