iwlwifi: move under intel vendor directory

Part of reorganising wireless drivers directory and Kconfig.

Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 1113 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/calib.c b/drivers/net/wireless/intel/iwlwifi/dvm/calib.c
new file mode 100644
index 000000000000..20e6aa910700
--- /dev/null
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/calib.c
@@ -0,0 +1,1113 @@
+/******************************************************************************
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2008 - 2014 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
+ * USA
+ *
+ * The full GNU General Public License is included in this distribution
+ * in the file called COPYING.
+ *
+ * Contact Information:
+ *  Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  * Neither the name Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+#include <linux/slab.h>
+#include <net/mac80211.h>
+
+#include "iwl-trans.h"
+
+#include "dev.h"
+#include "calib.h"
+#include "agn.h"
+
+/*****************************************************************************
+ * INIT calibrations framework
+ *****************************************************************************/
+
+/* Opaque calibration results */
+struct iwl_calib_result {
+        struct list_head list;
+        size_t cmd_len;
+        struct iwl_calib_hdr hdr;
+        /* data follows */
+};
+
+struct statistics_general_data {
+        u32 beacon_silence_rssi_a;
+        u32 beacon_silence_rssi_b;
+        u32 beacon_silence_rssi_c;
+        u32 beacon_energy_a;
+        u32 beacon_energy_b;
+        u32 beacon_energy_c;
+};
+
+int iwl_send_calib_results(struct iwl_priv *priv)
+{
+        struct iwl_host_cmd hcmd = {
+                .id = REPLY_PHY_CALIBRATION_CMD,
+        };
+        struct iwl_calib_result *res;
+
+        list_for_each_entry(res, &priv->calib_results, list) {
+                int ret;
+
+                hcmd.len[0] = res->cmd_len;
+                hcmd.data[0] = &res->hdr;
+                hcmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
+                ret = iwl_dvm_send_cmd(priv, &hcmd);
+                if (ret) {
+                        IWL_ERR(priv, "Error %d on calib cmd %d\n",
+                                ret, res->hdr.op_code);
+                        return ret;
+                }
+        }
+
+        return 0;
+}
+
+int iwl_calib_set(struct iwl_priv *priv,
+                  const struct iwl_calib_hdr *cmd, int len)
+{
+        struct iwl_calib_result *res, *tmp;
+
+        res = kmalloc(sizeof(*res) + len - sizeof(struct iwl_calib_hdr),
+                      GFP_ATOMIC);
+        if (!res)
+                return -ENOMEM;
+        memcpy(&res->hdr, cmd, len);
+        res->cmd_len = len;
+
+        list_for_each_entry(tmp, &priv->calib_results, list) {
+                if (tmp->hdr.op_code == res->hdr.op_code) {
+                        list_replace(&tmp->list, &res->list);
+                        kfree(tmp);
+                        return 0;
+                }
+        }
+
+        /* wasn't in list already */
+        list_add_tail(&res->list, &priv->calib_results);
+
+        return 0;
+}
+
+void iwl_calib_free_results(struct iwl_priv *priv)
+{
+        struct iwl_calib_result *res, *tmp;
+
+        list_for_each_entry_safe(res, tmp, &priv->calib_results, list) {
+                list_del(&res->list);
+                kfree(res);
+        }
+}
+
+/*****************************************************************************
+ * RUNTIME calibrations framework
+ *****************************************************************************/
+
+/* "false alarms" are signals that our DSP tries to lock onto,
+ *   but then determines that they are either noise, or transmissions
+ *   from a distant wireless network (also "noise", really) that get
+ *   "stepped on" by stronger transmissions within our own network.
+ * This algorithm attempts to set a sensitivity level that is high
+ *   enough to receive all of our own network traffic, but not so
+ *   high that our DSP gets too busy trying to lock onto non-network
+ *   activity/noise. */
+static int iwl_sens_energy_cck(struct iwl_priv *priv,
+                                   u32 norm_fa,
+                                   u32 rx_enable_time,
+                                   struct statistics_general_data *rx_info)
+{
+        u32 max_nrg_cck = 0;
+        int i = 0;
+        u8 max_silence_rssi = 0;
+        u32 silence_ref = 0;
+        u8 silence_rssi_a = 0;
+        u8 silence_rssi_b = 0;
+        u8 silence_rssi_c = 0;
+        u32 val;
+
+        /* "false_alarms" values below are cross-multiplications to assess the
+         *   numbers of false alarms within the measured period of actual Rx
+         *   (Rx is off when we're txing), vs the min/max expected false alarms
+         *   (some should be expected if rx is sensitive enough) in a
+         *   hypothetical listening period of 200 time units (TU), 204.8 msec:
+         *
+         * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
+         *
+         * */
+        u32 false_alarms = norm_fa * 200 * 1024;
+        u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
+        u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
+        struct iwl_sensitivity_data *data = NULL;
+        const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
+
+        data = &(priv->sensitivity_data);
+
+        data->nrg_auto_corr_silence_diff = 0;
+
+        /* Find max silence rssi among all 3 receivers.
+         * This is background noise, which may include transmissions from other
+         *    networks, measured during silence before our network's beacon */
+        silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
+                            ALL_BAND_FILTER) >> 8);
+        silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
+                            ALL_BAND_FILTER) >> 8);
+        silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
+                            ALL_BAND_FILTER) >> 8);
+
+        val = max(silence_rssi_b, silence_rssi_c);
+        max_silence_rssi = max(silence_rssi_a, (u8) val);
+
+        /* Store silence rssi in 20-beacon history table */
+        data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
+        data->nrg_silence_idx++;
+        if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
+                data->nrg_silence_idx = 0;
+
+        /* Find max silence rssi across 20 beacon history */
+        for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
+                val = data->nrg_silence_rssi[i];
+                silence_ref = max(silence_ref, val);
+        }
+        IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
+                        silence_rssi_a, silence_rssi_b, silence_rssi_c,
+                        silence_ref);
+
+        /* Find max rx energy (min value!) among all 3 receivers,
+         *   measured during beacon frame.
+         * Save it in 10-beacon history table. */
+        i = data->nrg_energy_idx;
+        val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
+        data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
+
+        data->nrg_energy_idx++;
+        if (data->nrg_energy_idx >= 10)
+                data->nrg_energy_idx = 0;
+
+        /* Find min rx energy (max value) across 10 beacon history.
+         * This is the minimum signal level that we want to receive well.
+         * Add backoff (margin so we don't miss slightly lower energy frames).
+         * This establishes an upper bound (min value) for energy threshold. */
+        max_nrg_cck = data->nrg_value[0];
+        for (i = 1; i < 10; i++)
+                max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
+        max_nrg_cck += 6;
+
+        IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
+                        rx_info->beacon_energy_a, rx_info->beacon_energy_b,
+                        rx_info->beacon_energy_c, max_nrg_cck - 6);
+
+        /* Count number of consecutive beacons with fewer-than-desired
+         *   false alarms. */
+        if (false_alarms < min_false_alarms)
+                data->num_in_cck_no_fa++;
+        else
+                data->num_in_cck_no_fa = 0;
+        IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
+                        data->num_in_cck_no_fa);
+
+        /* If we got too many false alarms this time, reduce sensitivity */
+        if ((false_alarms > max_false_alarms) &&
+                (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
+                IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
+                     false_alarms, max_false_alarms);
+                IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
+                data->nrg_curr_state = IWL_FA_TOO_MANY;
+                /* Store for "fewer than desired" on later beacon */
+                data->nrg_silence_ref = silence_ref;
+
+                /* increase energy threshold (reduce nrg value)
+                 *   to decrease sensitivity */
+                data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
+        /* Else if we got fewer than desired, increase sensitivity */
+        } else if (false_alarms < min_false_alarms) {
+                data->nrg_curr_state = IWL_FA_TOO_FEW;
+
+                /* Compare silence level with silence level for most recent
+                 *   healthy number or too many false alarms */
+                data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
+                                                   (s32)silence_ref;
+
+                IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",
+                         false_alarms, min_false_alarms,
+                         data->nrg_auto_corr_silence_diff);
+
+                /* Increase value to increase sensitivity, but only if:
+                 * 1a) previous beacon did *not* have *too many* false alarms
+                 * 1b) AND there's a significant difference in Rx levels
+                 *      from a previous beacon with too many, or healthy # FAs
+                 * OR 2) We've seen a lot of beacons (100) with too few
+                 *       false alarms */
+                if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
+                        ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
+                        (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
+
+                        IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
+                        /* Increase nrg value to increase sensitivity */
+                        val = data->nrg_th_cck + NRG_STEP_CCK;
+                        data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
+                } else {
+                        IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");
+                }
+
+        /* Else we got a healthy number of false alarms, keep status quo */
+        } else {
+                IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
+                data->nrg_curr_state = IWL_FA_GOOD_RANGE;
+
+                /* Store for use in "fewer than desired" with later beacon */
+                data->nrg_silence_ref = silence_ref;
+
+                /* If previous beacon had too many false alarms,
+                 *   give it some extra margin by reducing sensitivity again
+                 *   (but don't go below measured energy of desired Rx) */
+                if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
+                        IWL_DEBUG_CALIB(priv, "... increasing margin\n");
+                        if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
+                                data->nrg_th_cck -= NRG_MARGIN;
+                        else
+                                data->nrg_th_cck = max_nrg_cck;
+                }
+        }
+
+        /* Make sure the energy threshold does not go above the measured
+         * energy of the desired Rx signals (reduced by backoff margin),
+         * or else we might start missing Rx frames.
+         * Lower value is higher energy, so we use max()!
+         */
+        data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
+        IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
+
+        data->nrg_prev_state = data->nrg_curr_state;
+
+        /* Auto-correlation CCK algorithm */
+        if (false_alarms > min_false_alarms) {
+
+                /* increase auto_corr values to decrease sensitivity
+                 * so the DSP won't be disturbed by the noise
+                 */
+                if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
+                        data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
+                else {
+                        val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
+                        data->auto_corr_cck =
+                                min((u32)ranges->auto_corr_max_cck, val);
+                }
+                val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
+                data->auto_corr_cck_mrc =
+                        min((u32)ranges->auto_corr_max_cck_mrc, val);
+        } else if ((false_alarms < min_false_alarms) &&
+           ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
+           (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
+
+                /* Decrease auto_corr values to increase sensitivity */
+                val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
+                data->auto_corr_cck =
+                        max((u32)ranges->auto_corr_min_cck, val);
+                val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
+                data->auto_corr_cck_mrc =
+                        max((u32)ranges->auto_corr_min_cck_mrc, val);
+        }
+
+        return 0;
+}
+
+
+static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
+                                       u32 norm_fa,
+                                       u32 rx_enable_time)
+{
+        u32 val;
+        u32 false_alarms = norm_fa * 200 * 1024;
+        u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
+        u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
+        struct iwl_sensitivity_data *data = NULL;
+        const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
+
+        data = &(priv->sensitivity_data);
+
+        /* If we got too many false alarms this time, reduce sensitivity */
+        if (false_alarms > max_false_alarms) {
+
+                IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
+                             false_alarms, max_false_alarms);
+
+                val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
+                data->auto_corr_ofdm =
+                        min((u32)ranges->auto_corr_max_ofdm, val);
+
+                val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
+                data->auto_corr_ofdm_mrc =
+                        min((u32)ranges->auto_corr_max_ofdm_mrc, val);
+
+                val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
+                data->auto_corr_ofdm_x1 =
+                        min((u32)ranges->auto_corr_max_ofdm_x1, val);
+
+                val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
+                data->auto_corr_ofdm_mrc_x1 =
+                        min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
+        }
+
+        /* Else if we got fewer than desired, increase sensitivity */
+        else if (false_alarms < min_false_alarms) {
+
+                IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
+                             false_alarms, min_false_alarms);
+
+                val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
+                data->auto_corr_ofdm =
+                        max((u32)ranges->auto_corr_min_ofdm, val);
+
+                val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
+                data->auto_corr_ofdm_mrc =
+                        max((u32)ranges->auto_corr_min_ofdm_mrc, val);
+
+                val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
+                data->auto_corr_ofdm_x1 =
+                        max((u32)ranges->auto_corr_min_ofdm_x1, val);
+
+                val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
+                data->auto_corr_ofdm_mrc_x1 =
+                        max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
+        } else {
+                IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
+                         min_false_alarms, false_alarms, max_false_alarms);
+        }
+        return 0;
+}
+
+static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
+                                struct iwl_sensitivity_data *data,
+                                __le16 *tbl)
+{
+        tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
+                                cpu_to_le16((u16)data->auto_corr_ofdm);
+        tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
+                                cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
+        tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
+                                cpu_to_le16((u16)data->auto_corr_ofdm_x1);
+        tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
+                                cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
+
+        tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
+                                cpu_to_le16((u16)data->auto_corr_cck);
+        tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
+                                cpu_to_le16((u16)data->auto_corr_cck_mrc);
+
+        tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =
+                                cpu_to_le16((u16)data->nrg_th_cck);
+        tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =
+                                cpu_to_le16((u16)data->nrg_th_ofdm);
+
+        tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
+                                cpu_to_le16(data->barker_corr_th_min);
+        tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
+                                cpu_to_le16(data->barker_corr_th_min_mrc);
+        tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =
+                                cpu_to_le16(data->nrg_th_cca);
+
+        IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
+                        data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
+                        data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
+                        data->nrg_th_ofdm);
+
+        IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
+                        data->auto_corr_cck, data->auto_corr_cck_mrc,
+                        data->nrg_th_cck);
+}
+
+/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
+static int iwl_sensitivity_write(struct iwl_priv *priv)
+{
+        struct iwl_sensitivity_cmd cmd;
+        struct iwl_sensitivity_data *data = NULL;
+        struct iwl_host_cmd cmd_out = {
+                .id = SENSITIVITY_CMD,
+                .len = { sizeof(struct iwl_sensitivity_cmd), },
+                .flags = CMD_ASYNC,
+                .data = { &cmd, },
+        };
+
+        data = &(priv->sensitivity_data);
+
+        memset(&cmd, 0, sizeof(cmd));
+
+        iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);
+
+        /* Update uCode's "work" table, and copy it to DSP */
+        cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
+
+        /* Don't send command to uCode if nothing has changed */
+        if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
+                    sizeof(u16)*HD_TABLE_SIZE)) {
+                IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
+                return 0;
+        }
+
+        /* Copy table for comparison next time */
+        memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
+               sizeof(u16)*HD_TABLE_SIZE);
+
+        return iwl_dvm_send_cmd(priv, &cmd_out);
+}
+
+/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
+static int iwl_enhance_sensitivity_write(struct iwl_priv *priv)
+{
+        struct iwl_enhance_sensitivity_cmd cmd;
+        struct iwl_sensitivity_data *data = NULL;
+        struct iwl_host_cmd cmd_out = {
+                .id = SENSITIVITY_CMD,
+                .len = { sizeof(struct iwl_enhance_sensitivity_cmd), },
+                .flags = CMD_ASYNC,
+                .data = { &cmd, },
+        };
+
+        data = &(priv->sensitivity_data);
+
+        memset(&cmd, 0, sizeof(cmd));
+
+        iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.enhance_table[0]);
+
+        if (priv->lib->hd_v2) {
+                cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
+                        HD_INA_NON_SQUARE_DET_OFDM_DATA_V2;
+                cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
+                        HD_INA_NON_SQUARE_DET_CCK_DATA_V2;
+                cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
+                        HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V2;
+                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
+                        HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;
+                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
+                        HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;
+                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
+                        HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V2;
+                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
+                        HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V2;
+                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
+                        HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;
+                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
+                        HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;
+                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
+                        HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V2;
+                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
+                        HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V2;
+        } else {
+                cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
+                        HD_INA_NON_SQUARE_DET_OFDM_DATA_V1;
+                cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
+                        HD_INA_NON_SQUARE_DET_CCK_DATA_V1;
+                cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
+                        HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V1;
+                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
+                        HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;
+                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
+                        HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;
+                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
+                        HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V1;
+                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
+                        HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V1;
+                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
+                        HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;
+                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
+                        HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;
+                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
+                        HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V1;
+                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
+                        HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V1;
+        }
+
+        /* Update uCode's "work" table, and copy it to DSP */
+        cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
+
+        /* Don't send command to uCode if nothing has changed */
+        if (!memcmp(&cmd.enhance_table[0], &(priv->sensitivity_tbl[0]),
+                    sizeof(u16)*HD_TABLE_SIZE) &&
+            !memcmp(&cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX],
+                    &(priv->enhance_sensitivity_tbl[0]),
+                    sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES)) {
+                IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
+                return 0;
+        }
+
+        /* Copy table for comparison next time */
+        memcpy(&(priv->sensitivity_tbl[0]), &(cmd.enhance_table[0]),
+               sizeof(u16)*HD_TABLE_SIZE);
+        memcpy(&(priv->enhance_sensitivity_tbl[0]),
+               &(cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX]),
+               sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES);
+
+        return iwl_dvm_send_cmd(priv, &cmd_out);
+}
+
+void iwl_init_sensitivity(struct iwl_priv *priv)
+{
+        int ret = 0;
+        int i;
+        struct iwl_sensitivity_data *data = NULL;
+        const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
+
+        if (priv->calib_disabled & IWL_SENSITIVITY_CALIB_DISABLED)
+                return;
+
+        IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");
+
+        /* Clear driver's sensitivity algo data */
+        data = &(priv->sensitivity_data);
+
+        if (ranges == NULL)
+                return;
+
+        memset(data, 0, sizeof(struct iwl_sensitivity_data));
+
+        data->num_in_cck_no_fa = 0;
+        data->nrg_curr_state = IWL_FA_TOO_MANY;
+        data->nrg_prev_state = IWL_FA_TOO_MANY;
+        data->nrg_silence_ref = 0;
+        data->nrg_silence_idx = 0;
+        data->nrg_energy_idx = 0;
+
+        for (i = 0; i < 10; i++)
+                data->nrg_value[i] = 0;
+
+        for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
+                data->nrg_silence_rssi[i] = 0;
+
+        data->auto_corr_ofdm =  ranges->auto_corr_min_ofdm;
+        data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
+        data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
+        data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
+        data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
+        data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
+        data->nrg_th_cck = ranges->nrg_th_cck;
+        data->nrg_th_ofdm = ranges->nrg_th_ofdm;
+        data->barker_corr_th_min = ranges->barker_corr_th_min;
+        data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
+        data->nrg_th_cca = ranges->nrg_th_cca;
+
+        data->last_bad_plcp_cnt_ofdm = 0;
+        data->last_fa_cnt_ofdm = 0;
+        data->last_bad_plcp_cnt_cck = 0;
+        data->last_fa_cnt_cck = 0;
+
+        if (priv->fw->enhance_sensitivity_table)
+                ret |= iwl_enhance_sensitivity_write(priv);
+        else
+                ret |= iwl_sensitivity_write(priv);
+        IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
+}
+
+void iwl_sensitivity_calibration(struct iwl_priv *priv)
+{
+        u32 rx_enable_time;
+        u32 fa_cck;
+        u32 fa_ofdm;
+        u32 bad_plcp_cck;
+        u32 bad_plcp_ofdm;
+        u32 norm_fa_ofdm;
+        u32 norm_fa_cck;
+        struct iwl_sensitivity_data *data = NULL;
+        struct statistics_rx_non_phy *rx_info;
+        struct statistics_rx_phy *ofdm, *cck;
+        struct statistics_general_data statis;
+
+        if (priv->calib_disabled & IWL_SENSITIVITY_CALIB_DISABLED)
+                return;
+
+        data = &(priv->sensitivity_data);
+
+        if (!iwl_is_any_associated(priv)) {
+                IWL_DEBUG_CALIB(priv, "<< - not associated\n");
+                return;
+        }
+
+        spin_lock_bh(&priv->statistics.lock);
+        rx_info = &priv->statistics.rx_non_phy;
+        ofdm = &priv->statistics.rx_ofdm;
+        cck = &priv->statistics.rx_cck;
+        if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
+                IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
+                spin_unlock_bh(&priv->statistics.lock);
+                return;
+        }
+
+        /* Extract Statistics: */
+        rx_enable_time = le32_to_cpu(rx_info->channel_load);
+        fa_cck = le32_to_cpu(cck->false_alarm_cnt);
+        fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
+        bad_plcp_cck = le32_to_cpu(cck->plcp_err);
+        bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
+
+        statis.beacon_silence_rssi_a =
+                        le32_to_cpu(rx_info->beacon_silence_rssi_a);
+        statis.beacon_silence_rssi_b =
+                        le32_to_cpu(rx_info->beacon_silence_rssi_b);
+        statis.beacon_silence_rssi_c =
+                        le32_to_cpu(rx_info->beacon_silence_rssi_c);
+        statis.beacon_energy_a =
+                        le32_to_cpu(rx_info->beacon_energy_a);
+        statis.beacon_energy_b =
+                        le32_to_cpu(rx_info->beacon_energy_b);
+        statis.beacon_energy_c =
+                        le32_to_cpu(rx_info->beacon_energy_c);
+
+        spin_unlock_bh(&priv->statistics.lock);
+
+        IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
+
+        if (!rx_enable_time) {
+                IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
+                return;
+        }
+
+        /* These statistics increase monotonically, and do not reset
+         *   at each beacon.  Calculate difference from last value, or just
+         *   use the new statistics value if it has reset or wrapped around. */
+        if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
+                data->last_bad_plcp_cnt_cck = bad_plcp_cck;
+        else {
+                bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
+                data->last_bad_plcp_cnt_cck += bad_plcp_cck;
+        }
+
+        if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
+                data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
+        else {
+                bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
+                data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
+        }
+
+        if (data->last_fa_cnt_ofdm > fa_ofdm)
+                data->last_fa_cnt_ofdm = fa_ofdm;
+        else {
+                fa_ofdm -= data->last_fa_cnt_ofdm;
+                data->last_fa_cnt_ofdm += fa_ofdm;
+        }
+
+        if (data->last_fa_cnt_cck > fa_cck)
+                data->last_fa_cnt_cck = fa_cck;
+        else {
+                fa_cck -= data->last_fa_cnt_cck;
+                data->last_fa_cnt_cck += fa_cck;
+        }
+
+        /* Total aborted signal locks */
+        norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
+        norm_fa_cck = fa_cck + bad_plcp_cck;
+
+        IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
+                        bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
+
+        iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
+        iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
+        if (priv->fw->enhance_sensitivity_table)
+                iwl_enhance_sensitivity_write(priv);
+        else
+                iwl_sensitivity_write(priv);
+}
+
+static inline u8 find_first_chain(u8 mask)
+{
+        if (mask & ANT_A)
+                return CHAIN_A;
+        if (mask & ANT_B)
+                return CHAIN_B;
+        return CHAIN_C;
+}
+
+/**
+ * Run disconnected antenna algorithm to find out which antennas are
+ * disconnected.
+ */
+static void iwl_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
+                                     struct iwl_chain_noise_data *data)
+{
+        u32 active_chains = 0;
+        u32 max_average_sig;
+        u16 max_average_sig_antenna_i;
+        u8 num_tx_chains;
+        u8 first_chain;
+        u16 i = 0;
+
+        average_sig[0] = data->chain_signal_a / IWL_CAL_NUM_BEACONS;
+        average_sig[1] = data->chain_signal_b / IWL_CAL_NUM_BEACONS;
+        average_sig[2] = data->chain_signal_c / IWL_CAL_NUM_BEACONS;
+
+        if (average_sig[0] >= average_sig[1]) {
+                max_average_sig = average_sig[0];
+                max_average_sig_antenna_i = 0;
+                active_chains = (1 << max_average_sig_antenna_i);
+        } else {
+                max_average_sig = average_sig[1];
+                max_average_sig_antenna_i = 1;
+                active_chains = (1 << max_average_sig_antenna_i);
+        }
+
+        if (average_sig[2] >= max_average_sig) {
+                max_average_sig = average_sig[2];
+                max_average_sig_antenna_i = 2;
+                active_chains = (1 << max_average_sig_antenna_i);
+        }
+
+        IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
+                     average_sig[0], average_sig[1], average_sig[2]);
+        IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
+                     max_average_sig, max_average_sig_antenna_i);
+
+        /* Compare signal strengths for all 3 receivers. */
+        for (i = 0; i < NUM_RX_CHAINS; i++) {
+                if (i != max_average_sig_antenna_i) {
+                        s32 rssi_delta = (max_average_sig - average_sig[i]);
+
+                        /* If signal is very weak, compared with
+                         * strongest, mark it as disconnected. */
+                        if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
+                                data->disconn_array[i] = 1;
+                        else
+                                active_chains |= (1 << i);
+                        IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
+                             "disconn_array[i] = %d\n",
+                             i, rssi_delta, data->disconn_array[i]);
+                }
+        }
+
+        /*
+         * The above algorithm sometimes fails when the ucode
+         * reports 0 for all chains. It's not clear why that
+         * happens to start with, but it is then causing trouble
+         * because this can make us enable more chains than the
+         * hardware really has.
+         *
+         * To be safe, simply mask out any chains that we know
+         * are not on the device.
+         */
+        active_chains &= priv->nvm_data->valid_rx_ant;
+
+        num_tx_chains = 0;
+        for (i = 0; i < NUM_RX_CHAINS; i++) {
+                /* loops on all the bits of
+                 * priv->hw_setting.valid_tx_ant */
+                u8 ant_msk = (1 << i);
+                if (!(priv->nvm_data->valid_tx_ant & ant_msk))
+                        continue;
+
+                num_tx_chains++;
+                if (data->disconn_array[i] == 0)
+                        /* there is a Tx antenna connected */
+                        break;
+                if (num_tx_chains == priv->hw_params.tx_chains_num &&
+                    data->disconn_array[i]) {
+                        /*
+                         * If all chains are disconnected
+                         * connect the first valid tx chain
+                         */
+                        first_chain =
+                                find_first_chain(priv->nvm_data->valid_tx_ant);
+                        data->disconn_array[first_chain] = 0;
+                        active_chains |= BIT(first_chain);
+                        IWL_DEBUG_CALIB(priv,
+                                        "All Tx chains are disconnected W/A - declare %d as connected\n",
+                                        first_chain);
+                        break;
+                }
+        }
+
+        if (active_chains != priv->nvm_data->valid_rx_ant &&
+            active_chains != priv->chain_noise_data.active_chains)
+                IWL_DEBUG_CALIB(priv,
+                                "Detected that not all antennas are connected! "
+                                "Connected: %#x, valid: %#x.\n",
+                                active_chains,
+                                priv->nvm_data->valid_rx_ant);
+
+        /* Save for use within RXON, TX, SCAN commands, etc. */
+        data->active_chains = active_chains;
+        IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
+                        active_chains);
+}
+
+static void iwlagn_gain_computation(struct iwl_priv *priv,
+                                    u32 average_noise[NUM_RX_CHAINS],
+                                    u8 default_chain)
+{
+        int i;
+        s32 delta_g;
+        struct iwl_chain_noise_data *data = &priv->chain_noise_data;
+
+        /*
+         * Find Gain Code for the chains based on "default chain"
+         */
+        for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {
+                if ((data->disconn_array[i])) {
+                        data->delta_gain_code[i] = 0;
+                        continue;
+                }
+
+                delta_g = (priv->lib->chain_noise_scale *
+                        ((s32)average_noise[default_chain] -
+                        (s32)average_noise[i])) / 1500;
+
+                /* bound gain by 2 bits value max, 3rd bit is sign */
+                data->delta_gain_code[i] =
+                        min(abs(delta_g),
+                        (long) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
+
+                if (delta_g < 0)
+                        /*
+                         * set negative sign ...
+                         * note to Intel developers:  This is uCode API format,
+                         *   not the format of any internal device registers.
+                         *   Do not change this format for e.g. 6050 or similar
+                         *   devices.  Change format only if more resolution
+                         *   (i.e. more than 2 bits magnitude) is needed.
+                         */
+                        data->delta_gain_code[i] |= (1 << 2);
+        }
+
+        IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d  ANT_C = %d\n",
+                        data->delta_gain_code[1], data->delta_gain_code[2]);
+
+        if (!data->radio_write) {
+                struct iwl_calib_chain_noise_gain_cmd cmd;
+
+                memset(&cmd, 0, sizeof(cmd));
+
+                iwl_set_calib_hdr(&cmd.hdr,
+                        priv->phy_calib_chain_noise_gain_cmd);
+                cmd.delta_gain_1 = data->delta_gain_code[1];
+                cmd.delta_gain_2 = data->delta_gain_code[2];
+                iwl_dvm_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
+                        CMD_ASYNC, sizeof(cmd), &cmd);
+
+                data->radio_write = 1;
+                data->state = IWL_CHAIN_NOISE_CALIBRATED;
+        }
+}
+
+/*
+ * Accumulate 16 beacons of signal and noise statistics for each of
+ *   3 receivers/antennas/rx-chains, then figure out:
+ * 1)  Which antennas are connected.
+ * 2)  Differential rx gain settings to balance the 3 receivers.
+ */
+void iwl_chain_noise_calibration(struct iwl_priv *priv)
+{
+        struct iwl_chain_noise_data *data = NULL;
+
+        u32 chain_noise_a;
+        u32 chain_noise_b;
+        u32 chain_noise_c;
+        u32 chain_sig_a;
+        u32 chain_sig_b;
+        u32 chain_sig_c;
+        u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
+        u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
+        u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
+        u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
+        u16 i = 0;
+        u16 rxon_chnum = INITIALIZATION_VALUE;
+        u16 stat_chnum = INITIALIZATION_VALUE;
+        u8 rxon_band24;
+        u8 stat_band24;
+        struct statistics_rx_non_phy *rx_info;
+
+        /*
+         * MULTI-FIXME:
+         * When we support multiple interfaces on different channels,
+         * this must be modified/fixed.
+         */
+        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
+
+        if (priv->calib_disabled & IWL_CHAIN_NOISE_CALIB_DISABLED)
+                return;
+
+        data = &(priv->chain_noise_data);
+
+        /*
+         * Accumulate just the first "chain_noise_num_beacons" after
+         * the first association, then we're done forever.
+         */
+        if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
+                if (data->state == IWL_CHAIN_NOISE_ALIVE)
+                        IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
+                return;
+        }
+
+        spin_lock_bh(&priv->statistics.lock);
+
+        rx_info = &priv->statistics.rx_non_phy;
+
+        if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
+                IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
+                spin_unlock_bh(&priv->statistics.lock);
+                return;
+        }
+
+        rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
+        rxon_chnum = le16_to_cpu(ctx->staging.channel);
+        stat_band24 =
+                !!(priv->statistics.flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
+        stat_chnum = le32_to_cpu(priv->statistics.flag) >> 16;
+
+        /* Make sure we accumulate data for just the associated channel
+         *   (even if scanning). */
+        if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
+                IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
+                                rxon_chnum, rxon_band24);
+                spin_unlock_bh(&priv->statistics.lock);
+                return;
+        }
+
+        /*
+         *  Accumulate beacon statistics values across
+         * "chain_noise_num_beacons"
+         */
+        chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
+                                IN_BAND_FILTER;
+        chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
+                                IN_BAND_FILTER;
+        chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
+                                IN_BAND_FILTER;
+
+        chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
+        chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
+        chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
+
+        spin_unlock_bh(&priv->statistics.lock);
+
+        data->beacon_count++;
+
+        data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
+        data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
+        data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
+
+        data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
+        data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
+        data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
+
+        IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
+                        rxon_chnum, rxon_band24, data->beacon_count);
+        IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
+                        chain_sig_a, chain_sig_b, chain_sig_c);
+        IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
+                        chain_noise_a, chain_noise_b, chain_noise_c);
+
+        /* If this is the "chain_noise_num_beacons", determine:
+         * 1)  Disconnected antennas (using signal strengths)
+         * 2)  Differential gain (using silence noise) to balance receivers */
+        if (data->beacon_count != IWL_CAL_NUM_BEACONS)
+                return;
+
+        /* Analyze signal for disconnected antenna */
+        if (priv->lib->bt_params &&
+            priv->lib->bt_params->advanced_bt_coexist) {
+                /* Disable disconnected antenna algorithm for advanced
+                   bt coex, assuming valid antennas are connected */
+                data->active_chains = priv->nvm_data->valid_rx_ant;
+                for (i = 0; i < NUM_RX_CHAINS; i++)
+                        if (!(data->active_chains & (1<<i)))
+                                data->disconn_array[i] = 1;
+        } else
+                iwl_find_disconn_antenna(priv, average_sig, data);
+
+        /* Analyze noise for rx balance */
+        average_noise[0] = data->chain_noise_a / IWL_CAL_NUM_BEACONS;
+        average_noise[1] = data->chain_noise_b / IWL_CAL_NUM_BEACONS;
+        average_noise[2] = data->chain_noise_c / IWL_CAL_NUM_BEACONS;
+
+        for (i = 0; i < NUM_RX_CHAINS; i++) {
+                if (!(data->disconn_array[i]) &&
+                   (average_noise[i] <= min_average_noise)) {
+                        /* This means that chain i is active and has
+                         * lower noise values so far: */
+                        min_average_noise = average_noise[i];
+                        min_average_noise_antenna_i = i;
+                }
+        }
+
+        IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
+                        average_noise[0], average_noise[1],
+                        average_noise[2]);
+
+        IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
+                        min_average_noise, min_average_noise_antenna_i);
+
+        iwlagn_gain_computation(
+                priv, average_noise,
+                find_first_chain(priv->nvm_data->valid_rx_ant));
+
+        /* Some power changes may have been made during the calibration.
+         * Update and commit the RXON
+         */
+        iwl_update_chain_flags(priv);
+
+        data->state = IWL_CHAIN_NOISE_DONE;
+        iwl_power_update_mode(priv, false);
+}
+
+void iwl_reset_run_time_calib(struct iwl_priv *priv)
+{
+        int i;
+        memset(&(priv->sensitivity_data), 0,
+               sizeof(struct iwl_sensitivity_data));
+        memset(&(priv->chain_noise_data), 0,
+               sizeof(struct iwl_chain_noise_data));
+        for (i = 0; i < NUM_RX_CHAINS; i++)
+                priv->chain_noise_data.delta_gain_code[i] =
+                                CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
+
+        /* Ask for statistics now, the uCode will send notification
+         * periodically after association */
+        iwl_send_statistics_request(priv, CMD_ASYNC, true);
+}