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

   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 - 2010 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
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  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
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  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
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  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  *
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  32  *
  33  * Copyright(c) 2005 - 2010 Intel Corporation. All rights reserved.
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  37  * modification, are permitted provided that the following conditions
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  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.
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  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
  70 /*****************************************************************************
  71  * INIT calibrations framework
  72  *****************************************************************************/
  73
  74 struct statistics_general_data {
  75         u32 beacon_silence_rssi_a;
  76         u32 beacon_silence_rssi_b;
  77         u32 beacon_silence_rssi_c;
  78         u32 beacon_energy_a;
  79         u32 beacon_energy_b;
  80         u32 beacon_energy_c;
  81 };
  82
  83 int iwl_send_calib_results(struct iwl_priv *priv)
  84 {
  85         int ret = 0;
  86         int i = 0;
  87
  88         struct iwl_host_cmd hcmd = {
  89                 .id = REPLY_PHY_CALIBRATION_CMD,
  90                 .flags = CMD_SIZE_HUGE,
  91         };
  92
  93         for (i = 0; i < IWL_CALIB_MAX; i++) {
  94                 if ((BIT(i) & priv->hw_params.calib_init_cfg) &&
  95                     priv->calib_results[i].buf) {
  96                         hcmd.len = priv->calib_results[i].buf_len;
  97                         hcmd.data = priv->calib_results[i].buf;
  98                         ret = iwl_send_cmd_sync(priv, &hcmd);
  99                         if (ret) {
 100                                 IWL_ERR(priv, "Error %d iteration %d\n",
 101                                         ret, i);
 102                                 break;
 103                         }
 104                 }
 105         }
 106
 107         return ret;
 108 }
 109
 110 int iwl_calib_set(struct iwl_calib_result *res, const u8 *buf, int len)
 111 {
 112         if (res->buf_len != len) {
 113                 kfree(res->buf);
 114                 res->buf = kzalloc(len, GFP_ATOMIC);
 115         }
 116         if (unlikely(res->buf == NULL))
 117                 return -ENOMEM;
 118
 119         res->buf_len = len;
 120         memcpy(res->buf, buf, len);
 121         return 0;
 122 }
 123
 124 void iwl_calib_free_results(struct iwl_priv *priv)
 125 {
 126         int i;
 127
 128         for (i = 0; i < IWL_CALIB_MAX; i++) {
 129                 kfree(priv->calib_results[i].buf);
 130                 priv->calib_results[i].buf = NULL;
 131                 priv->calib_results[i].buf_len = 0;
 132         }
 133 }
 134
 135 /*****************************************************************************
 136  * RUNTIME calibrations framework
 137  *****************************************************************************/
 138
 139 /* "false alarms" are signals that our DSP tries to lock onto,
 140  *   but then determines that they are either noise, or transmissions
 141  *   from a distant wireless network (also "noise", really) that get
 142  *   "stepped on" by stronger transmissions within our own network.
 143  * This algorithm attempts to set a sensitivity level that is high
 144  *   enough to receive all of our own network traffic, but not so
 145  *   high that our DSP gets too busy trying to lock onto non-network
 146  *   activity/noise. */
 147 static int iwl_sens_energy_cck(struct iwl_priv *priv,
 148                                    u32 norm_fa,
 149                                    u32 rx_enable_time,
 150                                    struct statistics_general_data *rx_info)
 151 {
 152         u32 max_nrg_cck = 0;
 153         int i = 0;
 154         u8 max_silence_rssi = 0;
 155         u32 silence_ref = 0;
 156         u8 silence_rssi_a = 0;
 157         u8 silence_rssi_b = 0;
 158         u8 silence_rssi_c = 0;
 159         u32 val;
 160
 161         /* "false_alarms" values below are cross-multiplications to assess the
 162          *   numbers of false alarms within the measured period of actual Rx
 163          *   (Rx is off when we're txing), vs the min/max expected false alarms
 164          *   (some should be expected if rx is sensitive enough) in a
 165          *   hypothetical listening period of 200 time units (TU), 204.8 msec:
 166          *
 167          * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
 168          *
 169          * */
 170         u32 false_alarms = norm_fa * 200 * 1024;
 171         u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
 172         u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
 173         struct iwl_sensitivity_data *data = NULL;
 174         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 175
 176         data = &(priv->sensitivity_data);
 177
 178         data->nrg_auto_corr_silence_diff = 0;
 179
 180         /* Find max silence rssi among all 3 receivers.
 181          * This is background noise, which may include transmissions from other
 182          *    networks, measured during silence before our network's beacon */
 183         silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
 184                             ALL_BAND_FILTER) >> 8);
 185         silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
 186                             ALL_BAND_FILTER) >> 8);
 187         silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
 188                             ALL_BAND_FILTER) >> 8);
 189
 190         val = max(silence_rssi_b, silence_rssi_c);
 191         max_silence_rssi = max(silence_rssi_a, (u8) val);
 192
 193         /* Store silence rssi in 20-beacon history table */
 194         data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
 195         data->nrg_silence_idx++;
 196         if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
 197                 data->nrg_silence_idx = 0;
 198
 199         /* Find max silence rssi across 20 beacon history */
 200         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
 201                 val = data->nrg_silence_rssi[i];
 202                 silence_ref = max(silence_ref, val);
 203         }
 204         IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
 205                         silence_rssi_a, silence_rssi_b, silence_rssi_c,
 206                         silence_ref);
 207
 208         /* Find max rx energy (min value!) among all 3 receivers,
 209          *   measured during beacon frame.
 210          * Save it in 10-beacon history table. */
 211         i = data->nrg_energy_idx;
 212         val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
 213         data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
 214
 215         data->nrg_energy_idx++;
 216         if (data->nrg_energy_idx >= 10)
 217                 data->nrg_energy_idx = 0;
 218
 219         /* Find min rx energy (max value) across 10 beacon history.
 220          * This is the minimum signal level that we want to receive well.
 221          * Add backoff (margin so we don't miss slightly lower energy frames).
 222          * This establishes an upper bound (min value) for energy threshold. */
 223         max_nrg_cck = data->nrg_value[0];
 224         for (i = 1; i < 10; i++)
 225                 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
 226         max_nrg_cck += 6;
 227
 228         IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
 229                         rx_info->beacon_energy_a, rx_info->beacon_energy_b,
 230                         rx_info->beacon_energy_c, max_nrg_cck - 6);
 231
 232         /* Count number of consecutive beacons with fewer-than-desired
 233          *   false alarms. */
 234         if (false_alarms < min_false_alarms)
 235                 data->num_in_cck_no_fa++;
 236         else
 237                 data->num_in_cck_no_fa = 0;
 238         IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
 239                         data->num_in_cck_no_fa);
 240
 241         /* If we got too many false alarms this time, reduce sensitivity */
 242         if ((false_alarms > max_false_alarms) &&
 243                 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
 244                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
 245                      false_alarms, max_false_alarms);
 246                 IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
 247                 data->nrg_curr_state = IWL_FA_TOO_MANY;
 248                 /* Store for "fewer than desired" on later beacon */
 249                 data->nrg_silence_ref = silence_ref;
 250
 251                 /* increase energy threshold (reduce nrg value)
 252                  *   to decrease sensitivity */
 253                 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
 254         /* Else if we got fewer than desired, increase sensitivity */
 255         } else if (false_alarms < min_false_alarms) {
 256                 data->nrg_curr_state = IWL_FA_TOO_FEW;
 257
 258                 /* Compare silence level with silence level for most recent
 259                  *   healthy number or too many false alarms */
 260                 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
 261                                                    (s32)silence_ref;
 262
 263                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",
 264                          false_alarms, min_false_alarms,
 265                          data->nrg_auto_corr_silence_diff);
 266
 267                 /* Increase value to increase sensitivity, but only if:
 268                  * 1a) previous beacon did *not* have *too many* false alarms
 269                  * 1b) AND there's a significant difference in Rx levels
 270                  *      from a previous beacon with too many, or healthy # FAs
 271                  * OR 2) We've seen a lot of beacons (100) with too few
 272                  *       false alarms */
 273                 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
 274                         ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 275                         (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 276
 277                         IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
 278                         /* Increase nrg value to increase sensitivity */
 279                         val = data->nrg_th_cck + NRG_STEP_CCK;
 280                         data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
 281                 } else {
 282                         IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");
 283                 }
 284
 285         /* Else we got a healthy number of false alarms, keep status quo */
 286         } else {
 287                 IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
 288                 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
 289
 290                 /* Store for use in "fewer than desired" with later beacon */
 291                 data->nrg_silence_ref = silence_ref;
 292
 293                 /* If previous beacon had too many false alarms,
 294                  *   give it some extra margin by reducing sensitivity again
 295                  *   (but don't go below measured energy of desired Rx) */
 296                 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
 297                         IWL_DEBUG_CALIB(priv, "... increasing margin\n");
 298                         if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
 299                                 data->nrg_th_cck -= NRG_MARGIN;
 300                         else
 301                                 data->nrg_th_cck = max_nrg_cck;
 302                 }
 303         }
 304
 305         /* Make sure the energy threshold does not go above the measured
 306          * energy of the desired Rx signals (reduced by backoff margin),
 307          * or else we might start missing Rx frames.
 308          * Lower value is higher energy, so we use max()!
 309          */
 310         data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
 311         IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
 312
 313         data->nrg_prev_state = data->nrg_curr_state;
 314
 315         /* Auto-correlation CCK algorithm */
 316         if (false_alarms > min_false_alarms) {
 317
 318                 /* increase auto_corr values to decrease sensitivity
 319                  * so the DSP won't be disturbed by the noise
 320                  */
 321                 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
 322                         data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
 323                 else {
 324                         val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
 325                         data->auto_corr_cck =
 326                                 min((u32)ranges->auto_corr_max_cck, val);
 327                 }
 328                 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
 329                 data->auto_corr_cck_mrc =
 330                         min((u32)ranges->auto_corr_max_cck_mrc, val);
 331         } else if ((false_alarms < min_false_alarms) &&
 332            ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 333            (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 334
 335                 /* Decrease auto_corr values to increase sensitivity */
 336                 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
 337                 data->auto_corr_cck =
 338                         max((u32)ranges->auto_corr_min_cck, val);
 339                 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
 340                 data->auto_corr_cck_mrc =
 341                         max((u32)ranges->auto_corr_min_cck_mrc, val);
 342         }
 343
 344         return 0;
 345 }
 346
 347
 348 static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
 349                                        u32 norm_fa,
 350                                        u32 rx_enable_time)
 351 {
 352         u32 val;
 353         u32 false_alarms = norm_fa * 200 * 1024;
 354         u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
 355         u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
 356         struct iwl_sensitivity_data *data = NULL;
 357         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 358
 359         data = &(priv->sensitivity_data);
 360
 361         /* If we got too many false alarms this time, reduce sensitivity */
 362         if (false_alarms > max_false_alarms) {
 363
 364                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
 365                              false_alarms, max_false_alarms);
 366
 367                 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
 368                 data->auto_corr_ofdm =
 369                         min((u32)ranges->auto_corr_max_ofdm, val);
 370
 371                 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
 372                 data->auto_corr_ofdm_mrc =
 373                         min((u32)ranges->auto_corr_max_ofdm_mrc, val);
 374
 375                 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
 376                 data->auto_corr_ofdm_x1 =
 377                         min((u32)ranges->auto_corr_max_ofdm_x1, val);
 378
 379                 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
 380                 data->auto_corr_ofdm_mrc_x1 =
 381                         min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
 382         }
 383
 384         /* Else if we got fewer than desired, increase sensitivity */
 385         else if (false_alarms < min_false_alarms) {
 386
 387                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
 388                              false_alarms, min_false_alarms);
 389
 390                 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
 391                 data->auto_corr_ofdm =
 392                         max((u32)ranges->auto_corr_min_ofdm, val);
 393
 394                 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
 395                 data->auto_corr_ofdm_mrc =
 396                         max((u32)ranges->auto_corr_min_ofdm_mrc, val);
 397
 398                 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
 399                 data->auto_corr_ofdm_x1 =
 400                         max((u32)ranges->auto_corr_min_ofdm_x1, val);
 401
 402                 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
 403                 data->auto_corr_ofdm_mrc_x1 =
 404                         max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
 405         } else {
 406                 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
 407                          min_false_alarms, false_alarms, max_false_alarms);
 408         }
 409         return 0;
 410 }
 411
 412 static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
 413                                 struct iwl_sensitivity_data *data,
 414                                 __le16 *tbl)
 415 {
 416         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
 417                                 cpu_to_le16((u16)data->auto_corr_ofdm);
 418         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
 419                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
 420         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
 421                                 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
 422         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
 423                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
 424
 425         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
 426                                 cpu_to_le16((u16)data->auto_corr_cck);
 427         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
 428                                 cpu_to_le16((u16)data->auto_corr_cck_mrc);
 429
 430         tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =
 431                                 cpu_to_le16((u16)data->nrg_th_cck);
 432         tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =
 433                                 cpu_to_le16((u16)data->nrg_th_ofdm);
 434
 435         tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
 436                                 cpu_to_le16(data->barker_corr_th_min);
 437         tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
 438                                 cpu_to_le16(data->barker_corr_th_min_mrc);
 439         tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =
 440                                 cpu_to_le16(data->nrg_th_cca);
 441
 442         IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
 443                         data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
 444                         data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
 445                         data->nrg_th_ofdm);
 446
 447         IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
 448                         data->auto_corr_cck, data->auto_corr_cck_mrc,
 449                         data->nrg_th_cck);
 450 }
 451
 452 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 453 static int iwl_sensitivity_write(struct iwl_priv *priv)
 454 {
 455         struct iwl_sensitivity_cmd cmd;
 456         struct iwl_sensitivity_data *data = NULL;
 457         struct iwl_host_cmd cmd_out = {
 458                 .id = SENSITIVITY_CMD,
 459                 .len = sizeof(struct iwl_sensitivity_cmd),
 460                 .flags = CMD_ASYNC,
 461                 .data = &cmd,
 462         };
 463
 464         data = &(priv->sensitivity_data);
 465
 466         memset(&cmd, 0, sizeof(cmd));
 467
 468         iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);
 469
 470         /* Update uCode's "work" table, and copy it to DSP */
 471         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 472
 473         /* Don't send command to uCode if nothing has changed */
 474         if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
 475                     sizeof(u16)*HD_TABLE_SIZE)) {
 476                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 477                 return 0;
 478         }
 479
 480         /* Copy table for comparison next time */
 481         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
 482                sizeof(u16)*HD_TABLE_SIZE);
 483
 484         return iwl_send_cmd(priv, &cmd_out);
 485 }
 486
 487 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 488 static int iwl_enhance_sensitivity_write(struct iwl_priv *priv)
 489 {
 490         struct iwl_enhance_sensitivity_cmd cmd;
 491         struct iwl_sensitivity_data *data = NULL;
 492         struct iwl_host_cmd cmd_out = {
 493                 .id = SENSITIVITY_CMD,
 494                 .len = sizeof(struct iwl_enhance_sensitivity_cmd),
 495                 .flags = CMD_ASYNC,
 496                 .data = &cmd,
 497         };
 498
 499         data = &(priv->sensitivity_data);
 500
 501         memset(&cmd, 0, sizeof(cmd));
 502
 503         iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.enhance_table[0]);
 504
 505         cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
 506                 HD_INA_NON_SQUARE_DET_OFDM_DATA;
 507         cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
 508                 HD_INA_NON_SQUARE_DET_CCK_DATA;
 509         cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
 510                 HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA;
 511         cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 512                 HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA;
 513         cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 514                 HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA;
 515         cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
 516                 HD_OFDM_NON_SQUARE_DET_SLOPE_DATA;
 517         cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
 518                 HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA;
 519         cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 520                 HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA;
 521         cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 522                 HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA;
 523         cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
 524                 HD_CCK_NON_SQUARE_DET_SLOPE_DATA;
 525         cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
 526                 HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA;
 527
 528         /* Update uCode's "work" table, and copy it to DSP */
 529         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 530
 531         /* Don't send command to uCode if nothing has changed */
 532         if (!memcmp(&cmd.enhance_table[0], &(priv->sensitivity_tbl[0]),
 533                     sizeof(u16)*HD_TABLE_SIZE) &&
 534             !memcmp(&cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX],
 535                     &(priv->enhance_sensitivity_tbl[0]),
 536                     sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES)) {
 537                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 538                 return 0;
 539         }
 540
 541         /* Copy table for comparison next time */
 542         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.enhance_table[0]),
 543                sizeof(u16)*HD_TABLE_SIZE);
 544         memcpy(&(priv->enhance_sensitivity_tbl[0]),
 545                &(cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX]),
 546                sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES);
 547
 548         return iwl_send_cmd(priv, &cmd_out);
 549 }
 550
 551 void iwl_init_sensitivity(struct iwl_priv *priv)
 552 {
 553         int ret = 0;
 554         int i;
 555         struct iwl_sensitivity_data *data = NULL;
 556         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 557
 558         if (priv->disable_sens_cal)
 559                 return;
 560
 561         IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");
 562
 563         /* Clear driver's sensitivity algo data */
 564         data = &(priv->sensitivity_data);
 565
 566         if (ranges == NULL)
 567                 return;
 568
 569         memset(data, 0, sizeof(struct iwl_sensitivity_data));
 570
 571         data->num_in_cck_no_fa = 0;
 572         data->nrg_curr_state = IWL_FA_TOO_MANY;
 573         data->nrg_prev_state = IWL_FA_TOO_MANY;
 574         data->nrg_silence_ref = 0;
 575         data->nrg_silence_idx = 0;
 576         data->nrg_energy_idx = 0;
 577
 578         for (i = 0; i < 10; i++)
 579                 data->nrg_value[i] = 0;
 580
 581         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
 582                 data->nrg_silence_rssi[i] = 0;
 583
 584         data->auto_corr_ofdm =  ranges->auto_corr_min_ofdm;
 585         data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
 586         data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
 587         data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
 588         data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
 589         data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
 590         data->nrg_th_cck = ranges->nrg_th_cck;
 591         data->nrg_th_ofdm = ranges->nrg_th_ofdm;
 592         data->barker_corr_th_min = ranges->barker_corr_th_min;
 593         data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
 594         data->nrg_th_cca = ranges->nrg_th_cca;
 595
 596         data->last_bad_plcp_cnt_ofdm = 0;
 597         data->last_fa_cnt_ofdm = 0;
 598         data->last_bad_plcp_cnt_cck = 0;
 599         data->last_fa_cnt_cck = 0;
 600
 601         if (priv->enhance_sensitivity_table)
 602                 ret |= iwl_enhance_sensitivity_write(priv);
 603         else
 604                 ret |= iwl_sensitivity_write(priv);
 605         IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
 606 }
 607
 608 void iwl_sensitivity_calibration(struct iwl_priv *priv, void *resp)
 609 {
 610         u32 rx_enable_time;
 611         u32 fa_cck;
 612         u32 fa_ofdm;
 613         u32 bad_plcp_cck;
 614         u32 bad_plcp_ofdm;
 615         u32 norm_fa_ofdm;
 616         u32 norm_fa_cck;
 617         struct iwl_sensitivity_data *data = NULL;
 618         struct statistics_rx_non_phy *rx_info;
 619         struct statistics_rx_phy *ofdm, *cck;
 620         unsigned long flags;
 621         struct statistics_general_data statis;
 622
 623         if (priv->disable_sens_cal)
 624                 return;
 625
 626         data = &(priv->sensitivity_data);
 627
 628         if (!iwl_is_any_associated(priv)) {
 629                 IWL_DEBUG_CALIB(priv, "<< - not associated\n");
 630                 return;
 631         }
 632
 633         spin_lock_irqsave(&priv->lock, flags);
 634         if (priv->cfg->bt_params &&
 635             priv->cfg->bt_params->bt_statistics) {
 636                 rx_info = &(((struct iwl_bt_notif_statistics *)resp)->
 637                               rx.general.common);
 638                 ofdm = &(((struct iwl_bt_notif_statistics *)resp)->rx.ofdm);
 639                 cck = &(((struct iwl_bt_notif_statistics *)resp)->rx.cck);
 640         } else {
 641                 rx_info = &(((struct iwl_notif_statistics *)resp)->rx.general);
 642                 ofdm = &(((struct iwl_notif_statistics *)resp)->rx.ofdm);
 643                 cck = &(((struct iwl_notif_statistics *)resp)->rx.cck);
 644         }
 645         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 646                 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
 647                 spin_unlock_irqrestore(&priv->lock, flags);
 648                 return;
 649         }
 650
 651         /* Extract Statistics: */
 652         rx_enable_time = le32_to_cpu(rx_info->channel_load);
 653         fa_cck = le32_to_cpu(cck->false_alarm_cnt);
 654         fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
 655         bad_plcp_cck = le32_to_cpu(cck->plcp_err);
 656         bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
 657
 658         statis.beacon_silence_rssi_a =
 659                         le32_to_cpu(rx_info->beacon_silence_rssi_a);
 660         statis.beacon_silence_rssi_b =
 661                         le32_to_cpu(rx_info->beacon_silence_rssi_b);
 662         statis.beacon_silence_rssi_c =
 663                         le32_to_cpu(rx_info->beacon_silence_rssi_c);
 664         statis.beacon_energy_a =
 665                         le32_to_cpu(rx_info->beacon_energy_a);
 666         statis.beacon_energy_b =
 667                         le32_to_cpu(rx_info->beacon_energy_b);
 668         statis.beacon_energy_c =
 669                         le32_to_cpu(rx_info->beacon_energy_c);
 670
 671         spin_unlock_irqrestore(&priv->lock, flags);
 672
 673         IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
 674
 675         if (!rx_enable_time) {
 676                 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
 677                 return;
 678         }
 679
 680         /* These statistics increase monotonically, and do not reset
 681          *   at each beacon.  Calculate difference from last value, or just
 682          *   use the new statistics value if it has reset or wrapped around. */
 683         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
 684                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
 685         else {
 686                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
 687                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
 688         }
 689
 690         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
 691                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
 692         else {
 693                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
 694                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
 695         }
 696
 697         if (data->last_fa_cnt_ofdm > fa_ofdm)
 698                 data->last_fa_cnt_ofdm = fa_ofdm;
 699         else {
 700                 fa_ofdm -= data->last_fa_cnt_ofdm;
 701                 data->last_fa_cnt_ofdm += fa_ofdm;
 702         }
 703
 704         if (data->last_fa_cnt_cck > fa_cck)
 705                 data->last_fa_cnt_cck = fa_cck;
 706         else {
 707                 fa_cck -= data->last_fa_cnt_cck;
 708                 data->last_fa_cnt_cck += fa_cck;
 709         }
 710
 711         /* Total aborted signal locks */
 712         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
 713         norm_fa_cck = fa_cck + bad_plcp_cck;
 714
 715         IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
 716                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
 717
 718         iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
 719         iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
 720         if (priv->enhance_sensitivity_table)
 721                 iwl_enhance_sensitivity_write(priv);
 722         else
 723                 iwl_sensitivity_write(priv);
 724 }
 725
 726 static inline u8 find_first_chain(u8 mask)
 727 {
 728         if (mask & ANT_A)
 729                 return CHAIN_A;
 730         if (mask & ANT_B)
 731                 return CHAIN_B;
 732         return CHAIN_C;
 733 }
 734
 735 /*
 736  * Accumulate 20 beacons of signal and noise statistics for each of
 737  *   3 receivers/antennas/rx-chains, then figure out:
 738  * 1)  Which antennas are connected.
 739  * 2)  Differential rx gain settings to balance the 3 receivers.
 740  */
 741 void iwl_chain_noise_calibration(struct iwl_priv *priv, void *stat_resp)
 742 {
 743         struct iwl_chain_noise_data *data = NULL;
 744
 745         u32 chain_noise_a;
 746         u32 chain_noise_b;
 747         u32 chain_noise_c;
 748         u32 chain_sig_a;
 749         u32 chain_sig_b;
 750         u32 chain_sig_c;
 751         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 752         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 753         u32 max_average_sig;
 754         u16 max_average_sig_antenna_i;
 755         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
 756         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
 757         u16 i = 0;
 758         u16 rxon_chnum = INITIALIZATION_VALUE;
 759         u16 stat_chnum = INITIALIZATION_VALUE;
 760         u8 rxon_band24;
 761         u8 stat_band24;
 762         u32 active_chains = 0;
 763         u8 num_tx_chains;
 764         unsigned long flags;
 765         struct statistics_rx_non_phy *rx_info;
 766         u8 first_chain;
 767         /*
 768          * MULTI-FIXME:
 769          * When we support multiple interfaces on different channels,
 770          * this must be modified/fixed.
 771          */
 772         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 773
 774         if (priv->disable_chain_noise_cal)
 775                 return;
 776
 777         data = &(priv->chain_noise_data);
 778
 779         /*
 780          * Accumulate just the first "chain_noise_num_beacons" after
 781          * the first association, then we're done forever.
 782          */
 783         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
 784                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
 785                         IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
 786                 return;
 787         }
 788
 789         spin_lock_irqsave(&priv->lock, flags);
 790         if (priv->cfg->bt_params &&
 791             priv->cfg->bt_params->bt_statistics) {
 792                 rx_info = &(((struct iwl_bt_notif_statistics *)stat_resp)->
 793                               rx.general.common);
 794         } else {
 795                 rx_info = &(((struct iwl_notif_statistics *)stat_resp)->
 796                               rx.general);
 797         }
 798         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 799                 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
 800                 spin_unlock_irqrestore(&priv->lock, flags);
 801                 return;
 802         }
 803
 804         rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
 805         rxon_chnum = le16_to_cpu(ctx->staging.channel);
 806         if (priv->cfg->bt_params &&
 807             priv->cfg->bt_params->bt_statistics) {
 808                 stat_band24 = !!(((struct iwl_bt_notif_statistics *)
 809                                  stat_resp)->flag &
 810                                  STATISTICS_REPLY_FLG_BAND_24G_MSK);
 811                 stat_chnum = le32_to_cpu(((struct iwl_bt_notif_statistics *)
 812                                          stat_resp)->flag) >> 16;
 813         } else {
 814                 stat_band24 = !!(((struct iwl_notif_statistics *)
 815                                  stat_resp)->flag &
 816                                  STATISTICS_REPLY_FLG_BAND_24G_MSK);
 817                 stat_chnum = le32_to_cpu(((struct iwl_notif_statistics *)
 818                                          stat_resp)->flag) >> 16;
 819         }
 820
 821         /* Make sure we accumulate data for just the associated channel
 822          *   (even if scanning). */
 823         if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
 824                 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
 825                                 rxon_chnum, rxon_band24);
 826                 spin_unlock_irqrestore(&priv->lock, flags);
 827                 return;
 828         }
 829
 830         /*
 831          *  Accumulate beacon statistics values across
 832          * "chain_noise_num_beacons"
 833          */
 834         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
 835                                 IN_BAND_FILTER;
 836         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
 837                                 IN_BAND_FILTER;
 838         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
 839                                 IN_BAND_FILTER;
 840
 841         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
 842         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
 843         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
 844
 845         spin_unlock_irqrestore(&priv->lock, flags);
 846
 847         data->beacon_count++;
 848
 849         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
 850         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
 851         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
 852
 853         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
 854         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
 855         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
 856
 857         IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
 858                         rxon_chnum, rxon_band24, data->beacon_count);
 859         IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
 860                         chain_sig_a, chain_sig_b, chain_sig_c);
 861         IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
 862                         chain_noise_a, chain_noise_b, chain_noise_c);
 863
 864         /* If this is the "chain_noise_num_beacons", determine:
 865          * 1)  Disconnected antennas (using signal strengths)
 866          * 2)  Differential gain (using silence noise) to balance receivers */
 867         if (data->beacon_count !=
 868                 priv->cfg->base_params->chain_noise_num_beacons)
 869                 return;
 870
 871         /* Analyze signal for disconnected antenna */
 872         average_sig[0] = data->chain_signal_a /
 873                          priv->cfg->base_params->chain_noise_num_beacons;
 874         average_sig[1] = data->chain_signal_b /
 875                          priv->cfg->base_params->chain_noise_num_beacons;
 876         average_sig[2] = data->chain_signal_c /
 877                          priv->cfg->base_params->chain_noise_num_beacons;
 878
 879         if (average_sig[0] >= average_sig[1]) {
 880                 max_average_sig = average_sig[0];
 881                 max_average_sig_antenna_i = 0;
 882                 active_chains = (1 << max_average_sig_antenna_i);
 883         } else {
 884                 max_average_sig = average_sig[1];
 885                 max_average_sig_antenna_i = 1;
 886                 active_chains = (1 << max_average_sig_antenna_i);
 887         }
 888
 889         if (average_sig[2] >= max_average_sig) {
 890                 max_average_sig = average_sig[2];
 891                 max_average_sig_antenna_i = 2;
 892                 active_chains = (1 << max_average_sig_antenna_i);
 893         }
 894
 895         IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
 896                      average_sig[0], average_sig[1], average_sig[2]);
 897         IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
 898                      max_average_sig, max_average_sig_antenna_i);
 899
 900         /* Compare signal strengths for all 3 receivers. */
 901         for (i = 0; i < NUM_RX_CHAINS; i++) {
 902                 if (i != max_average_sig_antenna_i) {
 903                         s32 rssi_delta = (max_average_sig - average_sig[i]);
 904
 905                         /* If signal is very weak, compared with
 906                          * strongest, mark it as disconnected. */
 907                         if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
 908                                 data->disconn_array[i] = 1;
 909                         else
 910                                 active_chains |= (1 << i);
 911                         IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
 912                              "disconn_array[i] = %d\n",
 913                              i, rssi_delta, data->disconn_array[i]);
 914                 }
 915         }
 916
 917         /*
 918          * The above algorithm sometimes fails when the ucode
 919          * reports 0 for all chains. It's not clear why that
 920          * happens to start with, but it is then causing trouble
 921          * because this can make us enable more chains than the
 922          * hardware really has.
 923          *
 924          * To be safe, simply mask out any chains that we know
 925          * are not on the device.
 926          */
 927         if (priv->cfg->bt_params &&
 928             priv->cfg->bt_params->advanced_bt_coexist &&
 929             priv->bt_full_concurrent) {
 930                 /* operated as 1x1 in full concurrency mode */
 931                 active_chains &= first_antenna(priv->hw_params.valid_rx_ant);
 932         } else
 933                 active_chains &= priv->hw_params.valid_rx_ant;
 934
 935         num_tx_chains = 0;
 936         for (i = 0; i < NUM_RX_CHAINS; i++) {
 937                 /* loops on all the bits of
 938                  * priv->hw_setting.valid_tx_ant */
 939                 u8 ant_msk = (1 << i);
 940                 if (!(priv->hw_params.valid_tx_ant & ant_msk))
 941                         continue;
 942
 943                 num_tx_chains++;
 944                 if (data->disconn_array[i] == 0)
 945                         /* there is a Tx antenna connected */
 946                         break;
 947                 if (num_tx_chains == priv->hw_params.tx_chains_num &&
 948                     data->disconn_array[i]) {
 949                         /*
 950                          * If all chains are disconnected
 951                          * connect the first valid tx chain
 952                          */
 953                         first_chain =
 954                                 find_first_chain(priv->cfg->valid_tx_ant);
 955                         data->disconn_array[first_chain] = 0;
 956                         active_chains |= BIT(first_chain);
 957                         IWL_DEBUG_CALIB(priv, "All Tx chains are disconnected W/A - declare %d as connected\n",
 958                                         first_chain);
 959                         break;
 960                 }
 961         }
 962
 963         if (active_chains != priv->hw_params.valid_rx_ant &&
 964             active_chains != priv->chain_noise_data.active_chains)
 965                 IWL_DEBUG_CALIB(priv,
 966                                 "Detected that not all antennas are connected! "
 967                                 "Connected: %#x, valid: %#x.\n",
 968                                 active_chains, priv->hw_params.valid_rx_ant);
 969
 970         /* Save for use within RXON, TX, SCAN commands, etc. */
 971         priv->chain_noise_data.active_chains = active_chains;
 972         IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
 973                         active_chains);
 974
 975         /* Analyze noise for rx balance */
 976         average_noise[0] = data->chain_noise_a /
 977                            priv->cfg->base_params->chain_noise_num_beacons;
 978         average_noise[1] = data->chain_noise_b /
 979                            priv->cfg->base_params->chain_noise_num_beacons;
 980         average_noise[2] = data->chain_noise_c /
 981                            priv->cfg->base_params->chain_noise_num_beacons;
 982
 983         for (i = 0; i < NUM_RX_CHAINS; i++) {
 984                 if (!(data->disconn_array[i]) &&
 985                    (average_noise[i] <= min_average_noise)) {
 986                         /* This means that chain i is active and has
 987                          * lower noise values so far: */
 988                         min_average_noise = average_noise[i];
 989                         min_average_noise_antenna_i = i;
 990                 }
 991         }
 992
 993         IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
 994                         average_noise[0], average_noise[1],
 995                         average_noise[2]);
 996
 997         IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
 998                         min_average_noise, min_average_noise_antenna_i);
 999
1000         if (priv->cfg->ops->utils->gain_computation)
1001                 priv->cfg->ops->utils->gain_computation(priv, average_noise,
1002                                 min_average_noise_antenna_i, min_average_noise,
1003                                 find_first_chain(priv->cfg->valid_rx_ant));
1004
1005         /* Some power changes may have been made during the calibration.
1006          * Update and commit the RXON
1007          */
1008         if (priv->cfg->ops->lib->update_chain_flags)
1009                 priv->cfg->ops->lib->update_chain_flags(priv);
1010
1011         data->state = IWL_CHAIN_NOISE_DONE;
1012         iwl_power_update_mode(priv, false);
1013 }
1014
1015 void iwl_reset_run_time_calib(struct iwl_priv *priv)
1016 {
1017         int i;
1018         memset(&(priv->sensitivity_data), 0,
1019                sizeof(struct iwl_sensitivity_data));
1020         memset(&(priv->chain_noise_data), 0,
1021                sizeof(struct iwl_chain_noise_data));
1022         for (i = 0; i < NUM_RX_CHAINS; i++)
1023                 priv->chain_noise_data.delta_gain_code[i] =
1024                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
1025
1026         /* Ask for statistics now, the uCode will send notification
1027          * periodically after association */
1028         iwl_send_statistics_request(priv, CMD_ASYNC, true);
1029 }