linux/drivers/net/wireless/iwlwifi/iwl-agn-calib.c
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   1/******************************************************************************
   2 *
   3 * This file is provided under a dual BSD/GPLv2 license.  When using or
   4 * redistributing this file, you may do so under either license.
   5 *
   6 * GPL LICENSE SUMMARY
   7 *
   8 * Copyright(c) 2008 - 2012 Intel Corporation. All rights reserved.
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of version 2 of the GNU General Public License as
  12 * published by the Free Software Foundation.
  13 *
  14 * This program is distributed in the hope that it will be useful, but
  15 * WITHOUT ANY WARRANTY; without even the implied warranty of
  16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17 * General Public License for more details.
  18 *
  19 * You should have received a copy of the GNU General Public License
  20 * along with this program; if not, write to the Free Software
  21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22 * USA
  23 *
  24 * The full GNU General Public License is included in this distribution
  25 * in the file called LICENSE.GPL.
  26 *
  27 * Contact Information:
  28 *  Intel Linux Wireless <ilw@linux.intel.com>
  29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30 *
  31 * BSD LICENSE
  32 *
  33 * Copyright(c) 2005 - 2012 Intel Corporation. All rights reserved.
  34 * All rights reserved.
  35 *
  36 * Redistribution and use in source and binary forms, with or without
  37 * modification, are permitted provided that the following conditions
  38 * are met:
  39 *
  40 *  * Redistributions of source code must retain the above copyright
  41 *    notice, this list of conditions and the following disclaimer.
  42 *  * Redistributions in binary form must reproduce the above copyright
  43 *    notice, this list of conditions and the following disclaimer in
  44 *    the documentation and/or other materials provided with the
  45 *    distribution.
  46 *  * Neither the name Intel Corporation nor the names of its
  47 *    contributors may be used to endorse or promote products derived
  48 *    from this software without specific prior written permission.
  49 *
  50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61 *****************************************************************************/
  62
  63#include <linux/slab.h>
  64#include <net/mac80211.h>
  65
  66#include "iwl-dev.h"
  67#include "iwl-core.h"
  68#include "iwl-agn-calib.h"
  69#include "iwl-trans.h"
  70#include "iwl-agn.h"
  71
  72/*****************************************************************************
  73 * INIT calibrations framework
  74 *****************************************************************************/
  75
  76/* Opaque calibration results */
  77struct iwl_calib_result {
  78        struct list_head list;
  79        size_t cmd_len;
  80        struct iwl_calib_hdr hdr;
  81        /* data follows */
  82};
  83
  84struct statistics_general_data {
  85        u32 beacon_silence_rssi_a;
  86        u32 beacon_silence_rssi_b;
  87        u32 beacon_silence_rssi_c;
  88        u32 beacon_energy_a;
  89        u32 beacon_energy_b;
  90        u32 beacon_energy_c;
  91};
  92
  93int iwl_send_calib_results(struct iwl_priv *priv)
  94{
  95        struct iwl_host_cmd hcmd = {
  96                .id = REPLY_PHY_CALIBRATION_CMD,
  97                .flags = CMD_SYNC,
  98        };
  99        struct iwl_calib_result *res;
 100
 101        list_for_each_entry(res, &priv->calib_results, list) {
 102                int ret;
 103
 104                hcmd.len[0] = res->cmd_len;
 105                hcmd.data[0] = &res->hdr;
 106                hcmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 107                ret = iwl_dvm_send_cmd(priv, &hcmd);
 108                if (ret) {
 109                        IWL_ERR(priv, "Error %d on calib cmd %d\n",
 110                                ret, res->hdr.op_code);
 111                        return ret;
 112                }
 113        }
 114
 115        return 0;
 116}
 117
 118int iwl_calib_set(struct iwl_priv *priv,
 119                  const struct iwl_calib_hdr *cmd, int len)
 120{
 121        struct iwl_calib_result *res, *tmp;
 122
 123        res = kmalloc(sizeof(*res) + len - sizeof(struct iwl_calib_hdr),
 124                      GFP_ATOMIC);
 125        if (!res)
 126                return -ENOMEM;
 127        memcpy(&res->hdr, cmd, len);
 128        res->cmd_len = len;
 129
 130        list_for_each_entry(tmp, &priv->calib_results, list) {
 131                if (tmp->hdr.op_code == res->hdr.op_code) {
 132                        list_replace(&tmp->list, &res->list);
 133                        kfree(tmp);
 134                        return 0;
 135                }
 136        }
 137
 138        /* wasn't in list already */
 139        list_add_tail(&res->list, &priv->calib_results);
 140
 141        return 0;
 142}
 143
 144void iwl_calib_free_results(struct iwl_priv *priv)
 145{
 146        struct iwl_calib_result *res, *tmp;
 147
 148        list_for_each_entry_safe(res, tmp, &priv->calib_results, list) {
 149                list_del(&res->list);
 150                kfree(res);
 151        }
 152}
 153
 154/*****************************************************************************
 155 * RUNTIME calibrations framework
 156 *****************************************************************************/
 157
 158/* "false alarms" are signals that our DSP tries to lock onto,
 159 *   but then determines that they are either noise, or transmissions
 160 *   from a distant wireless network (also "noise", really) that get
 161 *   "stepped on" by stronger transmissions within our own network.
 162 * This algorithm attempts to set a sensitivity level that is high
 163 *   enough to receive all of our own network traffic, but not so
 164 *   high that our DSP gets too busy trying to lock onto non-network
 165 *   activity/noise. */
 166static int iwl_sens_energy_cck(struct iwl_priv *priv,
 167                                   u32 norm_fa,
 168                                   u32 rx_enable_time,
 169                                   struct statistics_general_data *rx_info)
 170{
 171        u32 max_nrg_cck = 0;
 172        int i = 0;
 173        u8 max_silence_rssi = 0;
 174        u32 silence_ref = 0;
 175        u8 silence_rssi_a = 0;
 176        u8 silence_rssi_b = 0;
 177        u8 silence_rssi_c = 0;
 178        u32 val;
 179
 180        /* "false_alarms" values below are cross-multiplications to assess the
 181         *   numbers of false alarms within the measured period of actual Rx
 182         *   (Rx is off when we're txing), vs the min/max expected false alarms
 183         *   (some should be expected if rx is sensitive enough) in a
 184         *   hypothetical listening period of 200 time units (TU), 204.8 msec:
 185         *
 186         * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
 187         *
 188         * */
 189        u32 false_alarms = norm_fa * 200 * 1024;
 190        u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
 191        u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
 192        struct iwl_sensitivity_data *data = NULL;
 193        const struct iwl_sensitivity_ranges *ranges = hw_params(priv).sens;
 194
 195        data = &(priv->sensitivity_data);
 196
 197        data->nrg_auto_corr_silence_diff = 0;
 198
 199        /* Find max silence rssi among all 3 receivers.
 200         * This is background noise, which may include transmissions from other
 201         *    networks, measured during silence before our network's beacon */
 202        silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
 203                            ALL_BAND_FILTER) >> 8);
 204        silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
 205                            ALL_BAND_FILTER) >> 8);
 206        silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
 207                            ALL_BAND_FILTER) >> 8);
 208
 209        val = max(silence_rssi_b, silence_rssi_c);
 210        max_silence_rssi = max(silence_rssi_a, (u8) val);
 211
 212        /* Store silence rssi in 20-beacon history table */
 213        data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
 214        data->nrg_silence_idx++;
 215        if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
 216                data->nrg_silence_idx = 0;
 217
 218        /* Find max silence rssi across 20 beacon history */
 219        for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
 220                val = data->nrg_silence_rssi[i];
 221                silence_ref = max(silence_ref, val);
 222        }
 223        IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
 224                        silence_rssi_a, silence_rssi_b, silence_rssi_c,
 225                        silence_ref);
 226
 227        /* Find max rx energy (min value!) among all 3 receivers,
 228         *   measured during beacon frame.
 229         * Save it in 10-beacon history table. */
 230        i = data->nrg_energy_idx;
 231        val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
 232        data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
 233
 234        data->nrg_energy_idx++;
 235        if (data->nrg_energy_idx >= 10)
 236                data->nrg_energy_idx = 0;
 237
 238        /* Find min rx energy (max value) across 10 beacon history.
 239         * This is the minimum signal level that we want to receive well.
 240         * Add backoff (margin so we don't miss slightly lower energy frames).
 241         * This establishes an upper bound (min value) for energy threshold. */
 242        max_nrg_cck = data->nrg_value[0];
 243        for (i = 1; i < 10; i++)
 244                max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
 245        max_nrg_cck += 6;
 246
 247        IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
 248                        rx_info->beacon_energy_a, rx_info->beacon_energy_b,
 249                        rx_info->beacon_energy_c, max_nrg_cck - 6);
 250
 251        /* Count number of consecutive beacons with fewer-than-desired
 252         *   false alarms. */
 253        if (false_alarms < min_false_alarms)
 254                data->num_in_cck_no_fa++;
 255        else
 256                data->num_in_cck_no_fa = 0;
 257        IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
 258                        data->num_in_cck_no_fa);
 259
 260        /* If we got too many false alarms this time, reduce sensitivity */
 261        if ((false_alarms > max_false_alarms) &&
 262                (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
 263                IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
 264                     false_alarms, max_false_alarms);
 265                IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
 266                data->nrg_curr_state = IWL_FA_TOO_MANY;
 267                /* Store for "fewer than desired" on later beacon */
 268                data->nrg_silence_ref = silence_ref;
 269
 270                /* increase energy threshold (reduce nrg value)
 271                 *   to decrease sensitivity */
 272                data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
 273        /* Else if we got fewer than desired, increase sensitivity */
 274        } else if (false_alarms < min_false_alarms) {
 275                data->nrg_curr_state = IWL_FA_TOO_FEW;
 276
 277                /* Compare silence level with silence level for most recent
 278                 *   healthy number or too many false alarms */
 279                data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
 280                                                   (s32)silence_ref;
 281
 282                IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",
 283                         false_alarms, min_false_alarms,
 284                         data->nrg_auto_corr_silence_diff);
 285
 286                /* Increase value to increase sensitivity, but only if:
 287                 * 1a) previous beacon did *not* have *too many* false alarms
 288                 * 1b) AND there's a significant difference in Rx levels
 289                 *      from a previous beacon with too many, or healthy # FAs
 290                 * OR 2) We've seen a lot of beacons (100) with too few
 291                 *       false alarms */
 292                if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
 293                        ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 294                        (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 295
 296                        IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
 297                        /* Increase nrg value to increase sensitivity */
 298                        val = data->nrg_th_cck + NRG_STEP_CCK;
 299                        data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
 300                } else {
 301                        IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");
 302                }
 303
 304        /* Else we got a healthy number of false alarms, keep status quo */
 305        } else {
 306                IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
 307                data->nrg_curr_state = IWL_FA_GOOD_RANGE;
 308
 309                /* Store for use in "fewer than desired" with later beacon */
 310                data->nrg_silence_ref = silence_ref;
 311
 312                /* If previous beacon had too many false alarms,
 313                 *   give it some extra margin by reducing sensitivity again
 314                 *   (but don't go below measured energy of desired Rx) */
 315                if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
 316                        IWL_DEBUG_CALIB(priv, "... increasing margin\n");
 317                        if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
 318                                data->nrg_th_cck -= NRG_MARGIN;
 319                        else
 320                                data->nrg_th_cck = max_nrg_cck;
 321                }
 322        }
 323
 324        /* Make sure the energy threshold does not go above the measured
 325         * energy of the desired Rx signals (reduced by backoff margin),
 326         * or else we might start missing Rx frames.
 327         * Lower value is higher energy, so we use max()!
 328         */
 329        data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
 330        IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
 331
 332        data->nrg_prev_state = data->nrg_curr_state;
 333
 334        /* Auto-correlation CCK algorithm */
 335        if (false_alarms > min_false_alarms) {
 336
 337                /* increase auto_corr values to decrease sensitivity
 338                 * so the DSP won't be disturbed by the noise
 339                 */
 340                if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
 341                        data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
 342                else {
 343                        val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
 344                        data->auto_corr_cck =
 345                                min((u32)ranges->auto_corr_max_cck, val);
 346                }
 347                val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
 348                data->auto_corr_cck_mrc =
 349                        min((u32)ranges->auto_corr_max_cck_mrc, val);
 350        } else if ((false_alarms < min_false_alarms) &&
 351           ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 352           (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 353
 354                /* Decrease auto_corr values to increase sensitivity */
 355                val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
 356                data->auto_corr_cck =
 357                        max((u32)ranges->auto_corr_min_cck, val);
 358                val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
 359                data->auto_corr_cck_mrc =
 360                        max((u32)ranges->auto_corr_min_cck_mrc, val);
 361        }
 362
 363        return 0;
 364}
 365
 366
 367static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
 368                                       u32 norm_fa,
 369                                       u32 rx_enable_time)
 370{
 371        u32 val;
 372        u32 false_alarms = norm_fa * 200 * 1024;
 373        u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
 374        u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
 375        struct iwl_sensitivity_data *data = NULL;
 376        const struct iwl_sensitivity_ranges *ranges = hw_params(priv).sens;
 377
 378        data = &(priv->sensitivity_data);
 379
 380        /* If we got too many false alarms this time, reduce sensitivity */
 381        if (false_alarms > max_false_alarms) {
 382
 383                IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
 384                             false_alarms, max_false_alarms);
 385
 386                val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
 387                data->auto_corr_ofdm =
 388                        min((u32)ranges->auto_corr_max_ofdm, val);
 389
 390                val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
 391                data->auto_corr_ofdm_mrc =
 392                        min((u32)ranges->auto_corr_max_ofdm_mrc, val);
 393
 394                val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
 395                data->auto_corr_ofdm_x1 =
 396                        min((u32)ranges->auto_corr_max_ofdm_x1, val);
 397
 398                val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
 399                data->auto_corr_ofdm_mrc_x1 =
 400                        min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
 401        }
 402
 403        /* Else if we got fewer than desired, increase sensitivity */
 404        else if (false_alarms < min_false_alarms) {
 405
 406                IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
 407                             false_alarms, min_false_alarms);
 408
 409                val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
 410                data->auto_corr_ofdm =
 411                        max((u32)ranges->auto_corr_min_ofdm, val);
 412
 413                val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
 414                data->auto_corr_ofdm_mrc =
 415                        max((u32)ranges->auto_corr_min_ofdm_mrc, val);
 416
 417                val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
 418                data->auto_corr_ofdm_x1 =
 419                        max((u32)ranges->auto_corr_min_ofdm_x1, val);
 420
 421                val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
 422                data->auto_corr_ofdm_mrc_x1 =
 423                        max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
 424        } else {
 425                IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
 426                         min_false_alarms, false_alarms, max_false_alarms);
 427        }
 428        return 0;
 429}
 430
 431static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
 432                                struct iwl_sensitivity_data *data,
 433                                __le16 *tbl)
 434{
 435        tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
 436                                cpu_to_le16((u16)data->auto_corr_ofdm);
 437        tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
 438                                cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
 439        tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
 440                                cpu_to_le16((u16)data->auto_corr_ofdm_x1);
 441        tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
 442                                cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
 443
 444        tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
 445                                cpu_to_le16((u16)data->auto_corr_cck);
 446        tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
 447                                cpu_to_le16((u16)data->auto_corr_cck_mrc);
 448
 449        tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =
 450                                cpu_to_le16((u16)data->nrg_th_cck);
 451        tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =
 452                                cpu_to_le16((u16)data->nrg_th_ofdm);
 453
 454        tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
 455                                cpu_to_le16(data->barker_corr_th_min);
 456        tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
 457                                cpu_to_le16(data->barker_corr_th_min_mrc);
 458        tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =
 459                                cpu_to_le16(data->nrg_th_cca);
 460
 461        IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
 462                        data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
 463                        data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
 464                        data->nrg_th_ofdm);
 465
 466        IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
 467                        data->auto_corr_cck, data->auto_corr_cck_mrc,
 468                        data->nrg_th_cck);
 469}
 470
 471/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 472static int iwl_sensitivity_write(struct iwl_priv *priv)
 473{
 474        struct iwl_sensitivity_cmd cmd;
 475        struct iwl_sensitivity_data *data = NULL;
 476        struct iwl_host_cmd cmd_out = {
 477                .id = SENSITIVITY_CMD,
 478                .len = { sizeof(struct iwl_sensitivity_cmd), },
 479                .flags = CMD_ASYNC,
 480                .data = { &cmd, },
 481        };
 482
 483        data = &(priv->sensitivity_data);
 484
 485        memset(&cmd, 0, sizeof(cmd));
 486
 487        iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);
 488
 489        /* Update uCode's "work" table, and copy it to DSP */
 490        cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 491
 492        /* Don't send command to uCode if nothing has changed */
 493        if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
 494                    sizeof(u16)*HD_TABLE_SIZE)) {
 495                IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 496                return 0;
 497        }
 498
 499        /* Copy table for comparison next time */
 500        memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
 501               sizeof(u16)*HD_TABLE_SIZE);
 502
 503        return iwl_dvm_send_cmd(priv, &cmd_out);
 504}
 505
 506/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 507static int iwl_enhance_sensitivity_write(struct iwl_priv *priv)
 508{
 509        struct iwl_enhance_sensitivity_cmd cmd;
 510        struct iwl_sensitivity_data *data = NULL;
 511        struct iwl_host_cmd cmd_out = {
 512                .id = SENSITIVITY_CMD,
 513                .len = { sizeof(struct iwl_enhance_sensitivity_cmd), },
 514                .flags = CMD_ASYNC,
 515                .data = { &cmd, },
 516        };
 517
 518        data = &(priv->sensitivity_data);
 519
 520        memset(&cmd, 0, sizeof(cmd));
 521
 522        iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.enhance_table[0]);
 523
 524        if (cfg(priv)->base_params->hd_v2) {
 525                cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
 526                        HD_INA_NON_SQUARE_DET_OFDM_DATA_V2;
 527                cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
 528                        HD_INA_NON_SQUARE_DET_CCK_DATA_V2;
 529                cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
 530                        HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V2;
 531                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 532                        HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;
 533                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 534                        HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;
 535                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
 536                        HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V2;
 537                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
 538                        HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V2;
 539                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 540                        HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;
 541                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 542                        HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;
 543                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
 544                        HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V2;
 545                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
 546                        HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V2;
 547        } else {
 548                cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
 549                        HD_INA_NON_SQUARE_DET_OFDM_DATA_V1;
 550                cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
 551                        HD_INA_NON_SQUARE_DET_CCK_DATA_V1;
 552                cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
 553                        HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V1;
 554                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 555                        HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;
 556                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 557                        HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;
 558                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
 559                        HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V1;
 560                cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
 561                        HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V1;
 562                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 563                        HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;
 564                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 565                        HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;
 566                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
 567                        HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V1;
 568                cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
 569                        HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V1;
 570        }
 571
 572        /* Update uCode's "work" table, and copy it to DSP */
 573        cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 574
 575        /* Don't send command to uCode if nothing has changed */
 576        if (!memcmp(&cmd.enhance_table[0], &(priv->sensitivity_tbl[0]),
 577                    sizeof(u16)*HD_TABLE_SIZE) &&
 578            !memcmp(&cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX],
 579                    &(priv->enhance_sensitivity_tbl[0]),
 580                    sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES)) {
 581                IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 582                return 0;
 583        }
 584
 585        /* Copy table for comparison next time */
 586        memcpy(&(priv->sensitivity_tbl[0]), &(cmd.enhance_table[0]),
 587               sizeof(u16)*HD_TABLE_SIZE);
 588        memcpy(&(priv->enhance_sensitivity_tbl[0]),
 589               &(cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX]),
 590               sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES);
 591
 592        return iwl_dvm_send_cmd(priv, &cmd_out);
 593}
 594
 595void iwl_init_sensitivity(struct iwl_priv *priv)
 596{
 597        int ret = 0;
 598        int i;
 599        struct iwl_sensitivity_data *data = NULL;
 600        const struct iwl_sensitivity_ranges *ranges = hw_params(priv).sens;
 601
 602        if (priv->disable_sens_cal)
 603                return;
 604
 605        IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");
 606
 607        /* Clear driver's sensitivity algo data */
 608        data = &(priv->sensitivity_data);
 609
 610        if (ranges == NULL)
 611                return;
 612
 613        memset(data, 0, sizeof(struct iwl_sensitivity_data));
 614
 615        data->num_in_cck_no_fa = 0;
 616        data->nrg_curr_state = IWL_FA_TOO_MANY;
 617        data->nrg_prev_state = IWL_FA_TOO_MANY;
 618        data->nrg_silence_ref = 0;
 619        data->nrg_silence_idx = 0;
 620        data->nrg_energy_idx = 0;
 621
 622        for (i = 0; i < 10; i++)
 623                data->nrg_value[i] = 0;
 624
 625        for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
 626                data->nrg_silence_rssi[i] = 0;
 627
 628        data->auto_corr_ofdm =  ranges->auto_corr_min_ofdm;
 629        data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
 630        data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
 631        data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
 632        data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
 633        data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
 634        data->nrg_th_cck = ranges->nrg_th_cck;
 635        data->nrg_th_ofdm = ranges->nrg_th_ofdm;
 636        data->barker_corr_th_min = ranges->barker_corr_th_min;
 637        data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
 638        data->nrg_th_cca = ranges->nrg_th_cca;
 639
 640        data->last_bad_plcp_cnt_ofdm = 0;
 641        data->last_fa_cnt_ofdm = 0;
 642        data->last_bad_plcp_cnt_cck = 0;
 643        data->last_fa_cnt_cck = 0;
 644
 645        if (priv->fw->enhance_sensitivity_table)
 646                ret |= iwl_enhance_sensitivity_write(priv);
 647        else
 648                ret |= iwl_sensitivity_write(priv);
 649        IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
 650}
 651
 652void iwl_sensitivity_calibration(struct iwl_priv *priv)
 653{
 654        u32 rx_enable_time;
 655        u32 fa_cck;
 656        u32 fa_ofdm;
 657        u32 bad_plcp_cck;
 658        u32 bad_plcp_ofdm;
 659        u32 norm_fa_ofdm;
 660        u32 norm_fa_cck;
 661        struct iwl_sensitivity_data *data = NULL;
 662        struct statistics_rx_non_phy *rx_info;
 663        struct statistics_rx_phy *ofdm, *cck;
 664        struct statistics_general_data statis;
 665
 666        if (priv->disable_sens_cal)
 667                return;
 668
 669        data = &(priv->sensitivity_data);
 670
 671        if (!iwl_is_any_associated(priv)) {
 672                IWL_DEBUG_CALIB(priv, "<< - not associated\n");
 673                return;
 674        }
 675
 676        spin_lock_bh(&priv->statistics.lock);
 677        rx_info = &priv->statistics.rx_non_phy;
 678        ofdm = &priv->statistics.rx_ofdm;
 679        cck = &priv->statistics.rx_cck;
 680        if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 681                IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
 682                spin_unlock_bh(&priv->statistics.lock);
 683                return;
 684        }
 685
 686        /* Extract Statistics: */
 687        rx_enable_time = le32_to_cpu(rx_info->channel_load);
 688        fa_cck = le32_to_cpu(cck->false_alarm_cnt);
 689        fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
 690        bad_plcp_cck = le32_to_cpu(cck->plcp_err);
 691        bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
 692
 693        statis.beacon_silence_rssi_a =
 694                        le32_to_cpu(rx_info->beacon_silence_rssi_a);
 695        statis.beacon_silence_rssi_b =
 696                        le32_to_cpu(rx_info->beacon_silence_rssi_b);
 697        statis.beacon_silence_rssi_c =
 698                        le32_to_cpu(rx_info->beacon_silence_rssi_c);
 699        statis.beacon_energy_a =
 700                        le32_to_cpu(rx_info->beacon_energy_a);
 701        statis.beacon_energy_b =
 702                        le32_to_cpu(rx_info->beacon_energy_b);
 703        statis.beacon_energy_c =
 704                        le32_to_cpu(rx_info->beacon_energy_c);
 705
 706        spin_unlock_bh(&priv->statistics.lock);
 707
 708        IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
 709
 710        if (!rx_enable_time) {
 711                IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
 712                return;
 713        }
 714
 715        /* These statistics increase monotonically, and do not reset
 716         *   at each beacon.  Calculate difference from last value, or just
 717         *   use the new statistics value if it has reset or wrapped around. */
 718        if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
 719                data->last_bad_plcp_cnt_cck = bad_plcp_cck;
 720        else {
 721                bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
 722                data->last_bad_plcp_cnt_cck += bad_plcp_cck;
 723        }
 724
 725        if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
 726                data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
 727        else {
 728                bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
 729                data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
 730        }
 731
 732        if (data->last_fa_cnt_ofdm > fa_ofdm)
 733                data->last_fa_cnt_ofdm = fa_ofdm;
 734        else {
 735                fa_ofdm -= data->last_fa_cnt_ofdm;
 736                data->last_fa_cnt_ofdm += fa_ofdm;
 737        }
 738
 739        if (data->last_fa_cnt_cck > fa_cck)
 740                data->last_fa_cnt_cck = fa_cck;
 741        else {
 742                fa_cck -= data->last_fa_cnt_cck;
 743                data->last_fa_cnt_cck += fa_cck;
 744        }
 745
 746        /* Total aborted signal locks */
 747        norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
 748        norm_fa_cck = fa_cck + bad_plcp_cck;
 749
 750        IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
 751                        bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
 752
 753        iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
 754        iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
 755        if (priv->fw->enhance_sensitivity_table)
 756                iwl_enhance_sensitivity_write(priv);
 757        else
 758                iwl_sensitivity_write(priv);
 759}
 760
 761static inline u8 find_first_chain(u8 mask)
 762{
 763        if (mask & ANT_A)
 764                return CHAIN_A;
 765        if (mask & ANT_B)
 766                return CHAIN_B;
 767        return CHAIN_C;
 768}
 769
 770/**
 771 * Run disconnected antenna algorithm to find out which antennas are
 772 * disconnected.
 773 */
 774static void iwl_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
 775                                     struct iwl_chain_noise_data *data)
 776{
 777        u32 active_chains = 0;
 778        u32 max_average_sig;
 779        u16 max_average_sig_antenna_i;
 780        u8 num_tx_chains;
 781        u8 first_chain;
 782        u16 i = 0;
 783
 784        average_sig[0] = data->chain_signal_a / IWL_CAL_NUM_BEACONS;
 785        average_sig[1] = data->chain_signal_b / IWL_CAL_NUM_BEACONS;
 786        average_sig[2] = data->chain_signal_c / IWL_CAL_NUM_BEACONS;
 787
 788        if (average_sig[0] >= average_sig[1]) {
 789                max_average_sig = average_sig[0];
 790                max_average_sig_antenna_i = 0;
 791                active_chains = (1 << max_average_sig_antenna_i);
 792        } else {
 793                max_average_sig = average_sig[1];
 794                max_average_sig_antenna_i = 1;
 795                active_chains = (1 << max_average_sig_antenna_i);
 796        }
 797
 798        if (average_sig[2] >= max_average_sig) {
 799                max_average_sig = average_sig[2];
 800                max_average_sig_antenna_i = 2;
 801                active_chains = (1 << max_average_sig_antenna_i);
 802        }
 803
 804        IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
 805                     average_sig[0], average_sig[1], average_sig[2]);
 806        IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
 807                     max_average_sig, max_average_sig_antenna_i);
 808
 809        /* Compare signal strengths for all 3 receivers. */
 810        for (i = 0; i < NUM_RX_CHAINS; i++) {
 811                if (i != max_average_sig_antenna_i) {
 812                        s32 rssi_delta = (max_average_sig - average_sig[i]);
 813
 814                        /* If signal is very weak, compared with
 815                         * strongest, mark it as disconnected. */
 816                        if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
 817                                data->disconn_array[i] = 1;
 818                        else
 819                                active_chains |= (1 << i);
 820                        IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
 821                             "disconn_array[i] = %d\n",
 822                             i, rssi_delta, data->disconn_array[i]);
 823                }
 824        }
 825
 826        /*
 827         * The above algorithm sometimes fails when the ucode
 828         * reports 0 for all chains. It's not clear why that
 829         * happens to start with, but it is then causing trouble
 830         * because this can make us enable more chains than the
 831         * hardware really has.
 832         *
 833         * To be safe, simply mask out any chains that we know
 834         * are not on the device.
 835         */
 836        active_chains &= hw_params(priv).valid_rx_ant;
 837
 838        num_tx_chains = 0;
 839        for (i = 0; i < NUM_RX_CHAINS; i++) {
 840                /* loops on all the bits of
 841                 * priv->hw_setting.valid_tx_ant */
 842                u8 ant_msk = (1 << i);
 843                if (!(hw_params(priv).valid_tx_ant & ant_msk))
 844                        continue;
 845
 846                num_tx_chains++;
 847                if (data->disconn_array[i] == 0)
 848                        /* there is a Tx antenna connected */
 849                        break;
 850                if (num_tx_chains == hw_params(priv).tx_chains_num &&
 851                    data->disconn_array[i]) {
 852                        /*
 853                         * If all chains are disconnected
 854                         * connect the first valid tx chain
 855                         */
 856                        first_chain =
 857                                find_first_chain(hw_params(priv).valid_tx_ant);
 858                        data->disconn_array[first_chain] = 0;
 859                        active_chains |= BIT(first_chain);
 860                        IWL_DEBUG_CALIB(priv,
 861                                        "All Tx chains are disconnected W/A - declare %d as connected\n",
 862                                        first_chain);
 863                        break;
 864                }
 865        }
 866
 867        if (active_chains != hw_params(priv).valid_rx_ant &&
 868            active_chains != priv->chain_noise_data.active_chains)
 869                IWL_DEBUG_CALIB(priv,
 870                                "Detected that not all antennas are connected! "
 871                                "Connected: %#x, valid: %#x.\n",
 872                                active_chains,
 873                                hw_params(priv).valid_rx_ant);
 874
 875        /* Save for use within RXON, TX, SCAN commands, etc. */
 876        data->active_chains = active_chains;
 877        IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
 878                        active_chains);
 879}
 880
 881static void iwlagn_gain_computation(struct iwl_priv *priv,
 882                                    u32 average_noise[NUM_RX_CHAINS],
 883                                    u8 default_chain)
 884{
 885        int i;
 886        s32 delta_g;
 887        struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 888
 889        /*
 890         * Find Gain Code for the chains based on "default chain"
 891         */
 892        for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {
 893                if ((data->disconn_array[i])) {
 894                        data->delta_gain_code[i] = 0;
 895                        continue;
 896                }
 897
 898                delta_g = (cfg(priv)->base_params->chain_noise_scale *
 899                        ((s32)average_noise[default_chain] -
 900                        (s32)average_noise[i])) / 1500;
 901
 902                /* bound gain by 2 bits value max, 3rd bit is sign */
 903                data->delta_gain_code[i] =
 904                        min(abs(delta_g),
 905                        (long) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
 906
 907                if (delta_g < 0)
 908                        /*
 909                         * set negative sign ...
 910                         * note to Intel developers:  This is uCode API format,
 911                         *   not the format of any internal device registers.
 912                         *   Do not change this format for e.g. 6050 or similar
 913                         *   devices.  Change format only if more resolution
 914                         *   (i.e. more than 2 bits magnitude) is needed.
 915                         */
 916                        data->delta_gain_code[i] |= (1 << 2);
 917        }
 918
 919        IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d  ANT_C = %d\n",
 920                        data->delta_gain_code[1], data->delta_gain_code[2]);
 921
 922        if (!data->radio_write) {
 923                struct iwl_calib_chain_noise_gain_cmd cmd;
 924
 925                memset(&cmd, 0, sizeof(cmd));
 926
 927                iwl_set_calib_hdr(&cmd.hdr,
 928                        priv->phy_calib_chain_noise_gain_cmd);
 929                cmd.delta_gain_1 = data->delta_gain_code[1];
 930                cmd.delta_gain_2 = data->delta_gain_code[2];
 931                iwl_dvm_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
 932                        CMD_ASYNC, sizeof(cmd), &cmd);
 933
 934                data->radio_write = 1;
 935                data->state = IWL_CHAIN_NOISE_CALIBRATED;
 936        }
 937}
 938
 939/*
 940 * Accumulate 16 beacons of signal and noise statistics for each of
 941 *   3 receivers/antennas/rx-chains, then figure out:
 942 * 1)  Which antennas are connected.
 943 * 2)  Differential rx gain settings to balance the 3 receivers.
 944 */
 945void iwl_chain_noise_calibration(struct iwl_priv *priv)
 946{
 947        struct iwl_chain_noise_data *data = NULL;
 948
 949        u32 chain_noise_a;
 950        u32 chain_noise_b;
 951        u32 chain_noise_c;
 952        u32 chain_sig_a;
 953        u32 chain_sig_b;
 954        u32 chain_sig_c;
 955        u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 956        u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 957        u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
 958        u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
 959        u16 i = 0;
 960        u16 rxon_chnum = INITIALIZATION_VALUE;
 961        u16 stat_chnum = INITIALIZATION_VALUE;
 962        u8 rxon_band24;
 963        u8 stat_band24;
 964        struct statistics_rx_non_phy *rx_info;
 965
 966        /*
 967         * MULTI-FIXME:
 968         * When we support multiple interfaces on different channels,
 969         * this must be modified/fixed.
 970         */
 971        struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 972
 973        if (priv->disable_chain_noise_cal)
 974                return;
 975
 976        data = &(priv->chain_noise_data);
 977
 978        /*
 979         * Accumulate just the first "chain_noise_num_beacons" after
 980         * the first association, then we're done forever.
 981         */
 982        if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
 983                if (data->state == IWL_CHAIN_NOISE_ALIVE)
 984                        IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
 985                return;
 986        }
 987
 988        spin_lock_bh(&priv->statistics.lock);
 989
 990        rx_info = &priv->statistics.rx_non_phy;
 991
 992        if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 993                IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
 994                spin_unlock_bh(&priv->statistics.lock);
 995                return;
 996        }
 997
 998        rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
 999        rxon_chnum = le16_to_cpu(ctx->staging.channel);
1000        stat_band24 =
1001                !!(priv->statistics.flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
1002        stat_chnum = le32_to_cpu(priv->statistics.flag) >> 16;
1003
1004        /* Make sure we accumulate data for just the associated channel
1005         *   (even if scanning). */
1006        if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
1007                IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
1008                                rxon_chnum, rxon_band24);
1009                spin_unlock_bh(&priv->statistics.lock);
1010                return;
1011        }
1012
1013        /*
1014         *  Accumulate beacon statistics values across
1015         * "chain_noise_num_beacons"
1016         */
1017        chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
1018                                IN_BAND_FILTER;
1019        chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
1020                                IN_BAND_FILTER;
1021        chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
1022                                IN_BAND_FILTER;
1023
1024        chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
1025        chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
1026        chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
1027
1028        spin_unlock_bh(&priv->statistics.lock);
1029
1030        data->beacon_count++;
1031
1032        data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
1033        data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
1034        data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
1035
1036        data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
1037        data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
1038        data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
1039
1040        IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
1041                        rxon_chnum, rxon_band24, data->beacon_count);
1042        IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
1043                        chain_sig_a, chain_sig_b, chain_sig_c);
1044        IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
1045                        chain_noise_a, chain_noise_b, chain_noise_c);
1046
1047        /* If this is the "chain_noise_num_beacons", determine:
1048         * 1)  Disconnected antennas (using signal strengths)
1049         * 2)  Differential gain (using silence noise) to balance receivers */
1050        if (data->beacon_count != IWL_CAL_NUM_BEACONS)
1051                return;
1052
1053        /* Analyze signal for disconnected antenna */
1054        if (cfg(priv)->bt_params &&
1055            cfg(priv)->bt_params->advanced_bt_coexist) {
1056                /* Disable disconnected antenna algorithm for advanced
1057                   bt coex, assuming valid antennas are connected */
1058                data->active_chains = hw_params(priv).valid_rx_ant;
1059                for (i = 0; i < NUM_RX_CHAINS; i++)
1060                        if (!(data->active_chains & (1<<i)))
1061                                data->disconn_array[i] = 1;
1062        } else
1063                iwl_find_disconn_antenna(priv, average_sig, data);
1064
1065        /* Analyze noise for rx balance */
1066        average_noise[0] = data->chain_noise_a / IWL_CAL_NUM_BEACONS;
1067        average_noise[1] = data->chain_noise_b / IWL_CAL_NUM_BEACONS;
1068        average_noise[2] = data->chain_noise_c / IWL_CAL_NUM_BEACONS;
1069
1070        for (i = 0; i < NUM_RX_CHAINS; i++) {
1071                if (!(data->disconn_array[i]) &&
1072                   (average_noise[i] <= min_average_noise)) {
1073                        /* This means that chain i is active and has
1074                         * lower noise values so far: */
1075                        min_average_noise = average_noise[i];
1076                        min_average_noise_antenna_i = i;
1077                }
1078        }
1079
1080        IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
1081                        average_noise[0], average_noise[1],
1082                        average_noise[2]);
1083
1084        IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
1085                        min_average_noise, min_average_noise_antenna_i);
1086
1087        iwlagn_gain_computation(priv, average_noise,
1088                                find_first_chain(hw_params(priv).valid_rx_ant));
1089
1090        /* Some power changes may have been made during the calibration.
1091         * Update and commit the RXON
1092         */
1093        iwl_update_chain_flags(priv);
1094
1095        data->state = IWL_CHAIN_NOISE_DONE;
1096        iwl_power_update_mode(priv, false);
1097}
1098
1099void iwl_reset_run_time_calib(struct iwl_priv *priv)
1100{
1101        int i;
1102        memset(&(priv->sensitivity_data), 0,
1103               sizeof(struct iwl_sensitivity_data));
1104        memset(&(priv->chain_noise_data), 0,
1105               sizeof(struct iwl_chain_noise_data));
1106        for (i = 0; i < NUM_RX_CHAINS; i++)
1107                priv->chain_noise_data.delta_gain_code[i] =
1108                                CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
1109
1110        /* Ask for statistics now, the uCode will send notification
1111         * periodically after association */
1112        iwl_send_statistics_request(priv, CMD_ASYNC, true);
1113}
1114