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 - 2011 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 - 2011 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.
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  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)
 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         rx_info = &priv->statistics.rx_non_phy;
 635         ofdm = &priv->statistics.rx_ofdm;
 636         cck = &priv->statistics.rx_cck;
 637         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 638                 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
 639                 spin_unlock_irqrestore(&priv->lock, flags);
 640                 return;
 641         }
 642
 643         /* Extract Statistics: */
 644         rx_enable_time = le32_to_cpu(rx_info->channel_load);
 645         fa_cck = le32_to_cpu(cck->false_alarm_cnt);
 646         fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
 647         bad_plcp_cck = le32_to_cpu(cck->plcp_err);
 648         bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
 649
 650         statis.beacon_silence_rssi_a =
 651                         le32_to_cpu(rx_info->beacon_silence_rssi_a);
 652         statis.beacon_silence_rssi_b =
 653                         le32_to_cpu(rx_info->beacon_silence_rssi_b);
 654         statis.beacon_silence_rssi_c =
 655                         le32_to_cpu(rx_info->beacon_silence_rssi_c);
 656         statis.beacon_energy_a =
 657                         le32_to_cpu(rx_info->beacon_energy_a);
 658         statis.beacon_energy_b =
 659                         le32_to_cpu(rx_info->beacon_energy_b);
 660         statis.beacon_energy_c =
 661                         le32_to_cpu(rx_info->beacon_energy_c);
 662
 663         spin_unlock_irqrestore(&priv->lock, flags);
 664
 665         IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
 666
 667         if (!rx_enable_time) {
 668                 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
 669                 return;
 670         }
 671
 672         /* These statistics increase monotonically, and do not reset
 673          *   at each beacon.  Calculate difference from last value, or just
 674          *   use the new statistics value if it has reset or wrapped around. */
 675         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
 676                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
 677         else {
 678                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
 679                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
 680         }
 681
 682         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
 683                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
 684         else {
 685                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
 686                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
 687         }
 688
 689         if (data->last_fa_cnt_ofdm > fa_ofdm)
 690                 data->last_fa_cnt_ofdm = fa_ofdm;
 691         else {
 692                 fa_ofdm -= data->last_fa_cnt_ofdm;
 693                 data->last_fa_cnt_ofdm += fa_ofdm;
 694         }
 695
 696         if (data->last_fa_cnt_cck > fa_cck)
 697                 data->last_fa_cnt_cck = fa_cck;
 698         else {
 699                 fa_cck -= data->last_fa_cnt_cck;
 700                 data->last_fa_cnt_cck += fa_cck;
 701         }
 702
 703         /* Total aborted signal locks */
 704         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
 705         norm_fa_cck = fa_cck + bad_plcp_cck;
 706
 707         IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
 708                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
 709
 710         iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
 711         iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
 712         if (priv->enhance_sensitivity_table)
 713                 iwl_enhance_sensitivity_write(priv);
 714         else
 715                 iwl_sensitivity_write(priv);
 716 }
 717
 718 static inline u8 find_first_chain(u8 mask)
 719 {
 720         if (mask & ANT_A)
 721                 return CHAIN_A;
 722         if (mask & ANT_B)
 723                 return CHAIN_B;
 724         return CHAIN_C;
 725 }
 726
 727 /**
 728  * Run disconnected antenna algorithm to find out which antennas are
 729  * disconnected.
 730  */
 731 static void iwl_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
 732                                      struct iwl_chain_noise_data *data)
 733 {
 734         u32 active_chains = 0;
 735         u32 max_average_sig;
 736         u16 max_average_sig_antenna_i;
 737         u8 num_tx_chains;
 738         u8 first_chain;
 739         u16 i = 0;
 740
 741         average_sig[0] = data->chain_signal_a /
 742                          priv->cfg->base_params->chain_noise_num_beacons;
 743         average_sig[1] = data->chain_signal_b /
 744                          priv->cfg->base_params->chain_noise_num_beacons;
 745         average_sig[2] = data->chain_signal_c /
 746                          priv->cfg->base_params->chain_noise_num_beacons;
 747
 748         if (average_sig[0] >= average_sig[1]) {
 749                 max_average_sig = average_sig[0];
 750                 max_average_sig_antenna_i = 0;
 751                 active_chains = (1 << max_average_sig_antenna_i);
 752         } else {
 753                 max_average_sig = average_sig[1];
 754                 max_average_sig_antenna_i = 1;
 755                 active_chains = (1 << max_average_sig_antenna_i);
 756         }
 757
 758         if (average_sig[2] >= max_average_sig) {
 759                 max_average_sig = average_sig[2];
 760                 max_average_sig_antenna_i = 2;
 761                 active_chains = (1 << max_average_sig_antenna_i);
 762         }
 763
 764         IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
 765                      average_sig[0], average_sig[1], average_sig[2]);
 766         IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
 767                      max_average_sig, max_average_sig_antenna_i);
 768
 769         /* Compare signal strengths for all 3 receivers. */
 770         for (i = 0; i < NUM_RX_CHAINS; i++) {
 771                 if (i != max_average_sig_antenna_i) {
 772                         s32 rssi_delta = (max_average_sig - average_sig[i]);
 773
 774                         /* If signal is very weak, compared with
 775                          * strongest, mark it as disconnected. */
 776                         if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
 777                                 data->disconn_array[i] = 1;
 778                         else
 779                                 active_chains |= (1 << i);
 780                         IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
 781                              "disconn_array[i] = %d\n",
 782                              i, rssi_delta, data->disconn_array[i]);
 783                 }
 784         }
 785
 786         /*
 787          * The above algorithm sometimes fails when the ucode
 788          * reports 0 for all chains. It's not clear why that
 789          * happens to start with, but it is then causing trouble
 790          * because this can make us enable more chains than the
 791          * hardware really has.
 792          *
 793          * To be safe, simply mask out any chains that we know
 794          * are not on the device.
 795          */
 796         active_chains &= priv->hw_params.valid_rx_ant;
 797
 798         num_tx_chains = 0;
 799         for (i = 0; i < NUM_RX_CHAINS; i++) {
 800                 /* loops on all the bits of
 801                  * priv->hw_setting.valid_tx_ant */
 802                 u8 ant_msk = (1 << i);
 803                 if (!(priv->hw_params.valid_tx_ant & ant_msk))
 804                         continue;
 805
 806                 num_tx_chains++;
 807                 if (data->disconn_array[i] == 0)
 808                         /* there is a Tx antenna connected */
 809                         break;
 810                 if (num_tx_chains == priv->hw_params.tx_chains_num &&
 811                     data->disconn_array[i]) {
 812                         /*
 813                          * If all chains are disconnected
 814                          * connect the first valid tx chain
 815                          */
 816                         first_chain =
 817                                 find_first_chain(priv->cfg->valid_tx_ant);
 818                         data->disconn_array[first_chain] = 0;
 819                         active_chains |= BIT(first_chain);
 820                         IWL_DEBUG_CALIB(priv, "All Tx chains are disconnected \
 821                                         W/A - declare %d as connected\n",
 822                                         first_chain);
 823                         break;
 824                 }
 825         }
 826
 827         if (active_chains != priv->hw_params.valid_rx_ant &&
 828             active_chains != priv->chain_noise_data.active_chains)
 829                 IWL_DEBUG_CALIB(priv,
 830                                 "Detected that not all antennas are connected! "
 831                                 "Connected: %#x, valid: %#x.\n",
 832                                 active_chains, priv->hw_params.valid_rx_ant);
 833
 834         /* Save for use within RXON, TX, SCAN commands, etc. */
 835         data->active_chains = active_chains;
 836         IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
 837                         active_chains);
 838 }
 839
 840
 841 /*
 842  * Accumulate 16 beacons of signal and noise statistics for each of
 843  *   3 receivers/antennas/rx-chains, then figure out:
 844  * 1)  Which antennas are connected.
 845  * 2)  Differential rx gain settings to balance the 3 receivers.
 846  */
 847 void iwl_chain_noise_calibration(struct iwl_priv *priv)
 848 {
 849         struct iwl_chain_noise_data *data = NULL;
 850
 851         u32 chain_noise_a;
 852         u32 chain_noise_b;
 853         u32 chain_noise_c;
 854         u32 chain_sig_a;
 855         u32 chain_sig_b;
 856         u32 chain_sig_c;
 857         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 858         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 859         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
 860         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
 861         u16 i = 0;
 862         u16 rxon_chnum = INITIALIZATION_VALUE;
 863         u16 stat_chnum = INITIALIZATION_VALUE;
 864         u8 rxon_band24;
 865         u8 stat_band24;
 866         unsigned long flags;
 867         struct statistics_rx_non_phy *rx_info;
 868
 869         /*
 870          * MULTI-FIXME:
 871          * When we support multiple interfaces on different channels,
 872          * this must be modified/fixed.
 873          */
 874         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 875
 876         if (priv->disable_chain_noise_cal)
 877                 return;
 878
 879         data = &(priv->chain_noise_data);
 880
 881         /*
 882          * Accumulate just the first "chain_noise_num_beacons" after
 883          * the first association, then we're done forever.
 884          */
 885         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
 886                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
 887                         IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
 888                 return;
 889         }
 890
 891         spin_lock_irqsave(&priv->lock, flags);
 892
 893         rx_info = &priv->statistics.rx_non_phy;
 894
 895         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 896                 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
 897                 spin_unlock_irqrestore(&priv->lock, flags);
 898                 return;
 899         }
 900
 901         rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
 902         rxon_chnum = le16_to_cpu(ctx->staging.channel);
 903         stat_band24 =
 904                 !!(priv->statistics.flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
 905         stat_chnum = le32_to_cpu(priv->statistics.flag) >> 16;
 906
 907         /* Make sure we accumulate data for just the associated channel
 908          *   (even if scanning). */
 909         if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
 910                 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
 911                                 rxon_chnum, rxon_band24);
 912                 spin_unlock_irqrestore(&priv->lock, flags);
 913                 return;
 914         }
 915
 916         /*
 917          *  Accumulate beacon statistics values across
 918          * "chain_noise_num_beacons"
 919          */
 920         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
 921                                 IN_BAND_FILTER;
 922         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
 923                                 IN_BAND_FILTER;
 924         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
 925                                 IN_BAND_FILTER;
 926
 927         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
 928         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
 929         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
 930
 931         spin_unlock_irqrestore(&priv->lock, flags);
 932
 933         data->beacon_count++;
 934
 935         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
 936         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
 937         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
 938
 939         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
 940         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
 941         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
 942
 943         IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
 944                         rxon_chnum, rxon_band24, data->beacon_count);
 945         IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
 946                         chain_sig_a, chain_sig_b, chain_sig_c);
 947         IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
 948                         chain_noise_a, chain_noise_b, chain_noise_c);
 949
 950         /* If this is the "chain_noise_num_beacons", determine:
 951          * 1)  Disconnected antennas (using signal strengths)
 952          * 2)  Differential gain (using silence noise) to balance receivers */
 953         if (data->beacon_count !=
 954                 priv->cfg->base_params->chain_noise_num_beacons)
 955                 return;
 956
 957         /* Analyze signal for disconnected antenna */
 958         if (priv->cfg->bt_params &&
 959             priv->cfg->bt_params->advanced_bt_coexist) {
 960                 /* Disable disconnected antenna algorithm for advanced
 961                    bt coex, assuming valid antennas are connected */
 962                 data->active_chains = priv->hw_params.valid_rx_ant;
 963                 for (i = 0; i < NUM_RX_CHAINS; i++)
 964                         if (!(data->active_chains & (1<<i)))
 965                                 data->disconn_array[i] = 1;
 966         } else
 967                 iwl_find_disconn_antenna(priv, average_sig, data);
 968
 969         /* Analyze noise for rx balance */
 970         average_noise[0] = data->chain_noise_a /
 971                            priv->cfg->base_params->chain_noise_num_beacons;
 972         average_noise[1] = data->chain_noise_b /
 973                            priv->cfg->base_params->chain_noise_num_beacons;
 974         average_noise[2] = data->chain_noise_c /
 975                            priv->cfg->base_params->chain_noise_num_beacons;
 976
 977         for (i = 0; i < NUM_RX_CHAINS; i++) {
 978                 if (!(data->disconn_array[i]) &&
 979                    (average_noise[i] <= min_average_noise)) {
 980                         /* This means that chain i is active and has
 981                          * lower noise values so far: */
 982                         min_average_noise = average_noise[i];
 983                         min_average_noise_antenna_i = i;
 984                 }
 985         }
 986
 987         IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
 988                         average_noise[0], average_noise[1],
 989                         average_noise[2]);
 990
 991         IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
 992                         min_average_noise, min_average_noise_antenna_i);
 993
 994         if (priv->cfg->ops->utils->gain_computation)
 995                 priv->cfg->ops->utils->gain_computation(priv, average_noise,
 996                                 min_average_noise_antenna_i, min_average_noise,
 997                                 find_first_chain(priv->cfg->valid_rx_ant));
 998
 999         /* Some power changes may have been made during the calibration.
1000          * Update and commit the RXON
1001          */
1002         if (priv->cfg->ops->lib->update_chain_flags)
1003                 priv->cfg->ops->lib->update_chain_flags(priv);
1004
1005         data->state = IWL_CHAIN_NOISE_DONE;
1006         iwl_power_update_mode(priv, false);
1007 }
1008
1009 void iwl_reset_run_time_calib(struct iwl_priv *priv)
1010 {
1011         int i;
1012         memset(&(priv->sensitivity_data), 0,
1013                sizeof(struct iwl_sensitivity_data));
1014         memset(&(priv->chain_noise_data), 0,
1015                sizeof(struct iwl_chain_noise_data));
1016         for (i = 0; i < NUM_RX_CHAINS; i++)
1017                 priv->chain_noise_data.delta_gain_code[i] =
1018                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
1019
1020         /* Ask for statistics now, the uCode will send notification
1021          * periodically after association */
1022         iwl_send_statistics_request(priv, CMD_ASYNC, true);
1023 }