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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  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
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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.
  42  *  * Redistributions in binary form must reproduce the above copyright
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  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_SYNC,
  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[0] = priv->calib_results[i].buf_len;
  97                         hcmd.data[0] = priv->calib_results[i].buf;
  98                         hcmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
  99                         ret = priv->trans.ops->send_cmd(priv, &hcmd);
 100                         if (ret) {
 101                                 IWL_ERR(priv, "Error %d iteration %d\n",
 102                                         ret, i);
 103                                 break;
 104                         }
 105                 }
 106         }
 107
 108         return ret;
 109 }
 110
 111 int iwl_calib_set(struct iwl_calib_result *res, const u8 *buf, int len)
 112 {
 113         if (res->buf_len != len) {
 114                 kfree(res->buf);
 115                 res->buf = kzalloc(len, GFP_ATOMIC);
 116         }
 117         if (unlikely(res->buf == NULL))
 118                 return -ENOMEM;
 119
 120         res->buf_len = len;
 121         memcpy(res->buf, buf, len);
 122         return 0;
 123 }
 124
 125 void iwl_calib_free_results(struct iwl_priv *priv)
 126 {
 127         int i;
 128
 129         for (i = 0; i < IWL_CALIB_MAX; i++) {
 130                 kfree(priv->calib_results[i].buf);
 131                 priv->calib_results[i].buf = NULL;
 132                 priv->calib_results[i].buf_len = 0;
 133         }
 134 }
 135
 136 /*****************************************************************************
 137  * RUNTIME calibrations framework
 138  *****************************************************************************/
 139
 140 /* "false alarms" are signals that our DSP tries to lock onto,
 141  *   but then determines that they are either noise, or transmissions
 142  *   from a distant wireless network (also "noise", really) that get
 143  *   "stepped on" by stronger transmissions within our own network.
 144  * This algorithm attempts to set a sensitivity level that is high
 145  *   enough to receive all of our own network traffic, but not so
 146  *   high that our DSP gets too busy trying to lock onto non-network
 147  *   activity/noise. */
 148 static int iwl_sens_energy_cck(struct iwl_priv *priv,
 149                                    u32 norm_fa,
 150                                    u32 rx_enable_time,
 151                                    struct statistics_general_data *rx_info)
 152 {
 153         u32 max_nrg_cck = 0;
 154         int i = 0;
 155         u8 max_silence_rssi = 0;
 156         u32 silence_ref = 0;
 157         u8 silence_rssi_a = 0;
 158         u8 silence_rssi_b = 0;
 159         u8 silence_rssi_c = 0;
 160         u32 val;
 161
 162         /* "false_alarms" values below are cross-multiplications to assess the
 163          *   numbers of false alarms within the measured period of actual Rx
 164          *   (Rx is off when we're txing), vs the min/max expected false alarms
 165          *   (some should be expected if rx is sensitive enough) in a
 166          *   hypothetical listening period of 200 time units (TU), 204.8 msec:
 167          *
 168          * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
 169          *
 170          * */
 171         u32 false_alarms = norm_fa * 200 * 1024;
 172         u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
 173         u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
 174         struct iwl_sensitivity_data *data = NULL;
 175         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 176
 177         data = &(priv->sensitivity_data);
 178
 179         data->nrg_auto_corr_silence_diff = 0;
 180
 181         /* Find max silence rssi among all 3 receivers.
 182          * This is background noise, which may include transmissions from other
 183          *    networks, measured during silence before our network's beacon */
 184         silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
 185                             ALL_BAND_FILTER) >> 8);
 186         silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
 187                             ALL_BAND_FILTER) >> 8);
 188         silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
 189                             ALL_BAND_FILTER) >> 8);
 190
 191         val = max(silence_rssi_b, silence_rssi_c);
 192         max_silence_rssi = max(silence_rssi_a, (u8) val);
 193
 194         /* Store silence rssi in 20-beacon history table */
 195         data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
 196         data->nrg_silence_idx++;
 197         if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
 198                 data->nrg_silence_idx = 0;
 199
 200         /* Find max silence rssi across 20 beacon history */
 201         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
 202                 val = data->nrg_silence_rssi[i];
 203                 silence_ref = max(silence_ref, val);
 204         }
 205         IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
 206                         silence_rssi_a, silence_rssi_b, silence_rssi_c,
 207                         silence_ref);
 208
 209         /* Find max rx energy (min value!) among all 3 receivers,
 210          *   measured during beacon frame.
 211          * Save it in 10-beacon history table. */
 212         i = data->nrg_energy_idx;
 213         val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
 214         data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
 215
 216         data->nrg_energy_idx++;
 217         if (data->nrg_energy_idx >= 10)
 218                 data->nrg_energy_idx = 0;
 219
 220         /* Find min rx energy (max value) across 10 beacon history.
 221          * This is the minimum signal level that we want to receive well.
 222          * Add backoff (margin so we don't miss slightly lower energy frames).
 223          * This establishes an upper bound (min value) for energy threshold. */
 224         max_nrg_cck = data->nrg_value[0];
 225         for (i = 1; i < 10; i++)
 226                 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
 227         max_nrg_cck += 6;
 228
 229         IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
 230                         rx_info->beacon_energy_a, rx_info->beacon_energy_b,
 231                         rx_info->beacon_energy_c, max_nrg_cck - 6);
 232
 233         /* Count number of consecutive beacons with fewer-than-desired
 234          *   false alarms. */
 235         if (false_alarms < min_false_alarms)
 236                 data->num_in_cck_no_fa++;
 237         else
 238                 data->num_in_cck_no_fa = 0;
 239         IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
 240                         data->num_in_cck_no_fa);
 241
 242         /* If we got too many false alarms this time, reduce sensitivity */
 243         if ((false_alarms > max_false_alarms) &&
 244                 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
 245                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
 246                      false_alarms, max_false_alarms);
 247                 IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
 248                 data->nrg_curr_state = IWL_FA_TOO_MANY;
 249                 /* Store for "fewer than desired" on later beacon */
 250                 data->nrg_silence_ref = silence_ref;
 251
 252                 /* increase energy threshold (reduce nrg value)
 253                  *   to decrease sensitivity */
 254                 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
 255         /* Else if we got fewer than desired, increase sensitivity */
 256         } else if (false_alarms < min_false_alarms) {
 257                 data->nrg_curr_state = IWL_FA_TOO_FEW;
 258
 259                 /* Compare silence level with silence level for most recent
 260                  *   healthy number or too many false alarms */
 261                 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
 262                                                    (s32)silence_ref;
 263
 264                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",
 265                          false_alarms, min_false_alarms,
 266                          data->nrg_auto_corr_silence_diff);
 267
 268                 /* Increase value to increase sensitivity, but only if:
 269                  * 1a) previous beacon did *not* have *too many* false alarms
 270                  * 1b) AND there's a significant difference in Rx levels
 271                  *      from a previous beacon with too many, or healthy # FAs
 272                  * OR 2) We've seen a lot of beacons (100) with too few
 273                  *       false alarms */
 274                 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
 275                         ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 276                         (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 277
 278                         IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
 279                         /* Increase nrg value to increase sensitivity */
 280                         val = data->nrg_th_cck + NRG_STEP_CCK;
 281                         data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
 282                 } else {
 283                         IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");
 284                 }
 285
 286         /* Else we got a healthy number of false alarms, keep status quo */
 287         } else {
 288                 IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
 289                 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
 290
 291                 /* Store for use in "fewer than desired" with later beacon */
 292                 data->nrg_silence_ref = silence_ref;
 293
 294                 /* If previous beacon had too many false alarms,
 295                  *   give it some extra margin by reducing sensitivity again
 296                  *   (but don't go below measured energy of desired Rx) */
 297                 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
 298                         IWL_DEBUG_CALIB(priv, "... increasing margin\n");
 299                         if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
 300                                 data->nrg_th_cck -= NRG_MARGIN;
 301                         else
 302                                 data->nrg_th_cck = max_nrg_cck;
 303                 }
 304         }
 305
 306         /* Make sure the energy threshold does not go above the measured
 307          * energy of the desired Rx signals (reduced by backoff margin),
 308          * or else we might start missing Rx frames.
 309          * Lower value is higher energy, so we use max()!
 310          */
 311         data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
 312         IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
 313
 314         data->nrg_prev_state = data->nrg_curr_state;
 315
 316         /* Auto-correlation CCK algorithm */
 317         if (false_alarms > min_false_alarms) {
 318
 319                 /* increase auto_corr values to decrease sensitivity
 320                  * so the DSP won't be disturbed by the noise
 321                  */
 322                 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
 323                         data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
 324                 else {
 325                         val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
 326                         data->auto_corr_cck =
 327                                 min((u32)ranges->auto_corr_max_cck, val);
 328                 }
 329                 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
 330                 data->auto_corr_cck_mrc =
 331                         min((u32)ranges->auto_corr_max_cck_mrc, val);
 332         } else if ((false_alarms < min_false_alarms) &&
 333            ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 334            (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 335
 336                 /* Decrease auto_corr values to increase sensitivity */
 337                 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
 338                 data->auto_corr_cck =
 339                         max((u32)ranges->auto_corr_min_cck, val);
 340                 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
 341                 data->auto_corr_cck_mrc =
 342                         max((u32)ranges->auto_corr_min_cck_mrc, val);
 343         }
 344
 345         return 0;
 346 }
 347
 348
 349 static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
 350                                        u32 norm_fa,
 351                                        u32 rx_enable_time)
 352 {
 353         u32 val;
 354         u32 false_alarms = norm_fa * 200 * 1024;
 355         u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
 356         u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
 357         struct iwl_sensitivity_data *data = NULL;
 358         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 359
 360         data = &(priv->sensitivity_data);
 361
 362         /* If we got too many false alarms this time, reduce sensitivity */
 363         if (false_alarms > max_false_alarms) {
 364
 365                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
 366                              false_alarms, max_false_alarms);
 367
 368                 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
 369                 data->auto_corr_ofdm =
 370                         min((u32)ranges->auto_corr_max_ofdm, val);
 371
 372                 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
 373                 data->auto_corr_ofdm_mrc =
 374                         min((u32)ranges->auto_corr_max_ofdm_mrc, val);
 375
 376                 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
 377                 data->auto_corr_ofdm_x1 =
 378                         min((u32)ranges->auto_corr_max_ofdm_x1, val);
 379
 380                 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
 381                 data->auto_corr_ofdm_mrc_x1 =
 382                         min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
 383         }
 384
 385         /* Else if we got fewer than desired, increase sensitivity */
 386         else if (false_alarms < min_false_alarms) {
 387
 388                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
 389                              false_alarms, min_false_alarms);
 390
 391                 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
 392                 data->auto_corr_ofdm =
 393                         max((u32)ranges->auto_corr_min_ofdm, val);
 394
 395                 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
 396                 data->auto_corr_ofdm_mrc =
 397                         max((u32)ranges->auto_corr_min_ofdm_mrc, val);
 398
 399                 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
 400                 data->auto_corr_ofdm_x1 =
 401                         max((u32)ranges->auto_corr_min_ofdm_x1, val);
 402
 403                 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
 404                 data->auto_corr_ofdm_mrc_x1 =
 405                         max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
 406         } else {
 407                 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
 408                          min_false_alarms, false_alarms, max_false_alarms);
 409         }
 410         return 0;
 411 }
 412
 413 static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
 414                                 struct iwl_sensitivity_data *data,
 415                                 __le16 *tbl)
 416 {
 417         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
 418                                 cpu_to_le16((u16)data->auto_corr_ofdm);
 419         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
 420                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
 421         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
 422                                 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
 423         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
 424                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
 425
 426         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
 427                                 cpu_to_le16((u16)data->auto_corr_cck);
 428         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
 429                                 cpu_to_le16((u16)data->auto_corr_cck_mrc);
 430
 431         tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =
 432                                 cpu_to_le16((u16)data->nrg_th_cck);
 433         tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =
 434                                 cpu_to_le16((u16)data->nrg_th_ofdm);
 435
 436         tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
 437                                 cpu_to_le16(data->barker_corr_th_min);
 438         tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
 439                                 cpu_to_le16(data->barker_corr_th_min_mrc);
 440         tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =
 441                                 cpu_to_le16(data->nrg_th_cca);
 442
 443         IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
 444                         data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
 445                         data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
 446                         data->nrg_th_ofdm);
 447
 448         IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
 449                         data->auto_corr_cck, data->auto_corr_cck_mrc,
 450                         data->nrg_th_cck);
 451 }
 452
 453 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 454 static int iwl_sensitivity_write(struct iwl_priv *priv)
 455 {
 456         struct iwl_sensitivity_cmd cmd;
 457         struct iwl_sensitivity_data *data = NULL;
 458         struct iwl_host_cmd cmd_out = {
 459                 .id = SENSITIVITY_CMD,
 460                 .len = { sizeof(struct iwl_sensitivity_cmd), },
 461                 .flags = CMD_ASYNC,
 462                 .data = { &cmd, },
 463         };
 464
 465         data = &(priv->sensitivity_data);
 466
 467         memset(&cmd, 0, sizeof(cmd));
 468
 469         iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);
 470
 471         /* Update uCode's "work" table, and copy it to DSP */
 472         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 473
 474         /* Don't send command to uCode if nothing has changed */
 475         if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
 476                     sizeof(u16)*HD_TABLE_SIZE)) {
 477                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 478                 return 0;
 479         }
 480
 481         /* Copy table for comparison next time */
 482         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
 483                sizeof(u16)*HD_TABLE_SIZE);
 484
 485         return priv->trans.ops->send_cmd(priv, &cmd_out);
 486 }
 487
 488 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 489 static int iwl_enhance_sensitivity_write(struct iwl_priv *priv)
 490 {
 491         struct iwl_enhance_sensitivity_cmd cmd;
 492         struct iwl_sensitivity_data *data = NULL;
 493         struct iwl_host_cmd cmd_out = {
 494                 .id = SENSITIVITY_CMD,
 495                 .len = { sizeof(struct iwl_enhance_sensitivity_cmd), },
 496                 .flags = CMD_ASYNC,
 497                 .data = { &cmd, },
 498         };
 499
 500         data = &(priv->sensitivity_data);
 501
 502         memset(&cmd, 0, sizeof(cmd));
 503
 504         iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.enhance_table[0]);
 505
 506         cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
 507                 HD_INA_NON_SQUARE_DET_OFDM_DATA;
 508         cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
 509                 HD_INA_NON_SQUARE_DET_CCK_DATA;
 510         cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
 511                 HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA;
 512         cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 513                 HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA;
 514         cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 515                 HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA;
 516         cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
 517                 HD_OFDM_NON_SQUARE_DET_SLOPE_DATA;
 518         cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
 519                 HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA;
 520         cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 521                 HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA;
 522         cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 523                 HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA;
 524         cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
 525                 HD_CCK_NON_SQUARE_DET_SLOPE_DATA;
 526         cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
 527                 HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA;
 528
 529         /* Update uCode's "work" table, and copy it to DSP */
 530         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 531
 532         /* Don't send command to uCode if nothing has changed */
 533         if (!memcmp(&cmd.enhance_table[0], &(priv->sensitivity_tbl[0]),
 534                     sizeof(u16)*HD_TABLE_SIZE) &&
 535             !memcmp(&cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX],
 536                     &(priv->enhance_sensitivity_tbl[0]),
 537                     sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES)) {
 538                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 539                 return 0;
 540         }
 541
 542         /* Copy table for comparison next time */
 543         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.enhance_table[0]),
 544                sizeof(u16)*HD_TABLE_SIZE);
 545         memcpy(&(priv->enhance_sensitivity_tbl[0]),
 546                &(cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX]),
 547                sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES);
 548
 549         return priv->trans.ops->send_cmd(priv, &cmd_out);
 550 }
 551
 552 void iwl_init_sensitivity(struct iwl_priv *priv)
 553 {
 554         int ret = 0;
 555         int i;
 556         struct iwl_sensitivity_data *data = NULL;
 557         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 558
 559         if (priv->disable_sens_cal)
 560                 return;
 561
 562         IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");
 563
 564         /* Clear driver's sensitivity algo data */
 565         data = &(priv->sensitivity_data);
 566
 567         if (ranges == NULL)
 568                 return;
 569
 570         memset(data, 0, sizeof(struct iwl_sensitivity_data));
 571
 572         data->num_in_cck_no_fa = 0;
 573         data->nrg_curr_state = IWL_FA_TOO_MANY;
 574         data->nrg_prev_state = IWL_FA_TOO_MANY;
 575         data->nrg_silence_ref = 0;
 576         data->nrg_silence_idx = 0;
 577         data->nrg_energy_idx = 0;
 578
 579         for (i = 0; i < 10; i++)
 580                 data->nrg_value[i] = 0;
 581
 582         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
 583                 data->nrg_silence_rssi[i] = 0;
 584
 585         data->auto_corr_ofdm =  ranges->auto_corr_min_ofdm;
 586         data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
 587         data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
 588         data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
 589         data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
 590         data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
 591         data->nrg_th_cck = ranges->nrg_th_cck;
 592         data->nrg_th_ofdm = ranges->nrg_th_ofdm;
 593         data->barker_corr_th_min = ranges->barker_corr_th_min;
 594         data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
 595         data->nrg_th_cca = ranges->nrg_th_cca;
 596
 597         data->last_bad_plcp_cnt_ofdm = 0;
 598         data->last_fa_cnt_ofdm = 0;
 599         data->last_bad_plcp_cnt_cck = 0;
 600         data->last_fa_cnt_cck = 0;
 601
 602         if (priv->enhance_sensitivity_table)
 603                 ret |= iwl_enhance_sensitivity_write(priv);
 604         else
 605                 ret |= iwl_sensitivity_write(priv);
 606         IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
 607 }
 608
 609 void iwl_sensitivity_calibration(struct iwl_priv *priv)
 610 {
 611         u32 rx_enable_time;
 612         u32 fa_cck;
 613         u32 fa_ofdm;
 614         u32 bad_plcp_cck;
 615         u32 bad_plcp_ofdm;
 616         u32 norm_fa_ofdm;
 617         u32 norm_fa_cck;
 618         struct iwl_sensitivity_data *data = NULL;
 619         struct statistics_rx_non_phy *rx_info;
 620         struct statistics_rx_phy *ofdm, *cck;
 621         unsigned long flags;
 622         struct statistics_general_data statis;
 623
 624         if (priv->disable_sens_cal)
 625                 return;
 626
 627         data = &(priv->sensitivity_data);
 628
 629         if (!iwl_is_any_associated(priv)) {
 630                 IWL_DEBUG_CALIB(priv, "<< - not associated\n");
 631                 return;
 632         }
 633
 634         spin_lock_irqsave(&priv->lock, flags);
 635         rx_info = &priv->statistics.rx_non_phy;
 636         ofdm = &priv->statistics.rx_ofdm;
 637         cck = &priv->statistics.rx_cck;
 638         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 639                 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
 640                 spin_unlock_irqrestore(&priv->lock, flags);
 641                 return;
 642         }
 643
 644         /* Extract Statistics: */
 645         rx_enable_time = le32_to_cpu(rx_info->channel_load);
 646         fa_cck = le32_to_cpu(cck->false_alarm_cnt);
 647         fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
 648         bad_plcp_cck = le32_to_cpu(cck->plcp_err);
 649         bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
 650
 651         statis.beacon_silence_rssi_a =
 652                         le32_to_cpu(rx_info->beacon_silence_rssi_a);
 653         statis.beacon_silence_rssi_b =
 654                         le32_to_cpu(rx_info->beacon_silence_rssi_b);
 655         statis.beacon_silence_rssi_c =
 656                         le32_to_cpu(rx_info->beacon_silence_rssi_c);
 657         statis.beacon_energy_a =
 658                         le32_to_cpu(rx_info->beacon_energy_a);
 659         statis.beacon_energy_b =
 660                         le32_to_cpu(rx_info->beacon_energy_b);
 661         statis.beacon_energy_c =
 662                         le32_to_cpu(rx_info->beacon_energy_c);
 663
 664         spin_unlock_irqrestore(&priv->lock, flags);
 665
 666         IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
 667
 668         if (!rx_enable_time) {
 669                 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
 670                 return;
 671         }
 672
 673         /* These statistics increase monotonically, and do not reset
 674          *   at each beacon.  Calculate difference from last value, or just
 675          *   use the new statistics value if it has reset or wrapped around. */
 676         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
 677                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
 678         else {
 679                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
 680                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
 681         }
 682
 683         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
 684                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
 685         else {
 686                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
 687                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
 688         }
 689
 690         if (data->last_fa_cnt_ofdm > fa_ofdm)
 691                 data->last_fa_cnt_ofdm = fa_ofdm;
 692         else {
 693                 fa_ofdm -= data->last_fa_cnt_ofdm;
 694                 data->last_fa_cnt_ofdm += fa_ofdm;
 695         }
 696
 697         if (data->last_fa_cnt_cck > fa_cck)
 698                 data->last_fa_cnt_cck = fa_cck;
 699         else {
 700                 fa_cck -= data->last_fa_cnt_cck;
 701                 data->last_fa_cnt_cck += fa_cck;
 702         }
 703
 704         /* Total aborted signal locks */
 705         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
 706         norm_fa_cck = fa_cck + bad_plcp_cck;
 707
 708         IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
 709                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
 710
 711         iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
 712         iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
 713         if (priv->enhance_sensitivity_table)
 714                 iwl_enhance_sensitivity_write(priv);
 715         else
 716                 iwl_sensitivity_write(priv);
 717 }
 718
 719 static inline u8 find_first_chain(u8 mask)
 720 {
 721         if (mask & ANT_A)
 722                 return CHAIN_A;
 723         if (mask & ANT_B)
 724                 return CHAIN_B;
 725         return CHAIN_C;
 726 }
 727
 728 /**
 729  * Run disconnected antenna algorithm to find out which antennas are
 730  * disconnected.
 731  */
 732 static void iwl_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
 733                                      struct iwl_chain_noise_data *data)
 734 {
 735         u32 active_chains = 0;
 736         u32 max_average_sig;
 737         u16 max_average_sig_antenna_i;
 738         u8 num_tx_chains;
 739         u8 first_chain;
 740         u16 i = 0;
 741
 742         average_sig[0] = data->chain_signal_a /
 743                          priv->cfg->base_params->chain_noise_num_beacons;
 744         average_sig[1] = data->chain_signal_b /
 745                          priv->cfg->base_params->chain_noise_num_beacons;
 746         average_sig[2] = data->chain_signal_c /
 747                          priv->cfg->base_params->chain_noise_num_beacons;
 748
 749         if (average_sig[0] >= average_sig[1]) {
 750                 max_average_sig = average_sig[0];
 751                 max_average_sig_antenna_i = 0;
 752                 active_chains = (1 << max_average_sig_antenna_i);
 753         } else {
 754                 max_average_sig = average_sig[1];
 755                 max_average_sig_antenna_i = 1;
 756                 active_chains = (1 << max_average_sig_antenna_i);
 757         }
 758
 759         if (average_sig[2] >= max_average_sig) {
 760                 max_average_sig = average_sig[2];
 761                 max_average_sig_antenna_i = 2;
 762                 active_chains = (1 << max_average_sig_antenna_i);
 763         }
 764
 765         IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
 766                      average_sig[0], average_sig[1], average_sig[2]);
 767         IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
 768                      max_average_sig, max_average_sig_antenna_i);
 769
 770         /* Compare signal strengths for all 3 receivers. */
 771         for (i = 0; i < NUM_RX_CHAINS; i++) {
 772                 if (i != max_average_sig_antenna_i) {
 773                         s32 rssi_delta = (max_average_sig - average_sig[i]);
 774
 775                         /* If signal is very weak, compared with
 776                          * strongest, mark it as disconnected. */
 777                         if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
 778                                 data->disconn_array[i] = 1;
 779                         else
 780                                 active_chains |= (1 << i);
 781                         IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
 782                              "disconn_array[i] = %d\n",
 783                              i, rssi_delta, data->disconn_array[i]);
 784                 }
 785         }
 786
 787         /*
 788          * The above algorithm sometimes fails when the ucode
 789          * reports 0 for all chains. It's not clear why that
 790          * happens to start with, but it is then causing trouble
 791          * because this can make us enable more chains than the
 792          * hardware really has.
 793          *
 794          * To be safe, simply mask out any chains that we know
 795          * are not on the device.
 796          */
 797         active_chains &= priv->hw_params.valid_rx_ant;
 798
 799         num_tx_chains = 0;
 800         for (i = 0; i < NUM_RX_CHAINS; i++) {
 801                 /* loops on all the bits of
 802                  * priv->hw_setting.valid_tx_ant */
 803                 u8 ant_msk = (1 << i);
 804                 if (!(priv->hw_params.valid_tx_ant & ant_msk))
 805                         continue;
 806
 807                 num_tx_chains++;
 808                 if (data->disconn_array[i] == 0)
 809                         /* there is a Tx antenna connected */
 810                         break;
 811                 if (num_tx_chains == priv->hw_params.tx_chains_num &&
 812                     data->disconn_array[i]) {
 813                         /*
 814                          * If all chains are disconnected
 815                          * connect the first valid tx chain
 816                          */
 817                         first_chain =
 818                                 find_first_chain(priv->cfg->valid_tx_ant);
 819                         data->disconn_array[first_chain] = 0;
 820                         active_chains |= BIT(first_chain);
 821                         IWL_DEBUG_CALIB(priv,
 822                                         "All Tx chains are disconnected W/A - declare %d as connected\n",
 823                                         first_chain);
 824                         break;
 825                 }
 826         }
 827
 828         if (active_chains != priv->hw_params.valid_rx_ant &&
 829             active_chains != priv->chain_noise_data.active_chains)
 830                 IWL_DEBUG_CALIB(priv,
 831                                 "Detected that not all antennas are connected! "
 832                                 "Connected: %#x, valid: %#x.\n",
 833                                 active_chains, priv->hw_params.valid_rx_ant);
 834
 835         /* Save for use within RXON, TX, SCAN commands, etc. */
 836         data->active_chains = active_chains;
 837         IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
 838                         active_chains);
 839 }
 840
 841
 842 /*
 843  * Accumulate 16 beacons of signal and noise statistics for each of
 844  *   3 receivers/antennas/rx-chains, then figure out:
 845  * 1)  Which antennas are connected.
 846  * 2)  Differential rx gain settings to balance the 3 receivers.
 847  */
 848 void iwl_chain_noise_calibration(struct iwl_priv *priv)
 849 {
 850         struct iwl_chain_noise_data *data = NULL;
 851
 852         u32 chain_noise_a;
 853         u32 chain_noise_b;
 854         u32 chain_noise_c;
 855         u32 chain_sig_a;
 856         u32 chain_sig_b;
 857         u32 chain_sig_c;
 858         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 859         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 860         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
 861         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
 862         u16 i = 0;
 863         u16 rxon_chnum = INITIALIZATION_VALUE;
 864         u16 stat_chnum = INITIALIZATION_VALUE;
 865         u8 rxon_band24;
 866         u8 stat_band24;
 867         unsigned long flags;
 868         struct statistics_rx_non_phy *rx_info;
 869
 870         /*
 871          * MULTI-FIXME:
 872          * When we support multiple interfaces on different channels,
 873          * this must be modified/fixed.
 874          */
 875         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 876
 877         if (priv->disable_chain_noise_cal)
 878                 return;
 879
 880         data = &(priv->chain_noise_data);
 881
 882         /*
 883          * Accumulate just the first "chain_noise_num_beacons" after
 884          * the first association, then we're done forever.
 885          */
 886         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
 887                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
 888                         IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
 889                 return;
 890         }
 891
 892         spin_lock_irqsave(&priv->lock, flags);
 893
 894         rx_info = &priv->statistics.rx_non_phy;
 895
 896         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 897                 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
 898                 spin_unlock_irqrestore(&priv->lock, flags);
 899                 return;
 900         }
 901
 902         rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
 903         rxon_chnum = le16_to_cpu(ctx->staging.channel);
 904         stat_band24 =
 905                 !!(priv->statistics.flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
 906         stat_chnum = le32_to_cpu(priv->statistics.flag) >> 16;
 907
 908         /* Make sure we accumulate data for just the associated channel
 909          *   (even if scanning). */
 910         if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
 911                 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
 912                                 rxon_chnum, rxon_band24);
 913                 spin_unlock_irqrestore(&priv->lock, flags);
 914                 return;
 915         }
 916
 917         /*
 918          *  Accumulate beacon statistics values across
 919          * "chain_noise_num_beacons"
 920          */
 921         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
 922                                 IN_BAND_FILTER;
 923         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
 924                                 IN_BAND_FILTER;
 925         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
 926                                 IN_BAND_FILTER;
 927
 928         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
 929         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
 930         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
 931
 932         spin_unlock_irqrestore(&priv->lock, flags);
 933
 934         data->beacon_count++;
 935
 936         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
 937         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
 938         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
 939
 940         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
 941         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
 942         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
 943
 944         IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
 945                         rxon_chnum, rxon_band24, data->beacon_count);
 946         IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
 947                         chain_sig_a, chain_sig_b, chain_sig_c);
 948         IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
 949                         chain_noise_a, chain_noise_b, chain_noise_c);
 950
 951         /* If this is the "chain_noise_num_beacons", determine:
 952          * 1)  Disconnected antennas (using signal strengths)
 953          * 2)  Differential gain (using silence noise) to balance receivers */
 954         if (data->beacon_count !=
 955                 priv->cfg->base_params->chain_noise_num_beacons)
 956                 return;
 957
 958         /* Analyze signal for disconnected antenna */
 959         if (priv->cfg->bt_params &&
 960             priv->cfg->bt_params->advanced_bt_coexist) {
 961                 /* Disable disconnected antenna algorithm for advanced
 962                    bt coex, assuming valid antennas are connected */
 963                 data->active_chains = priv->hw_params.valid_rx_ant;
 964                 for (i = 0; i < NUM_RX_CHAINS; i++)
 965                         if (!(data->active_chains & (1<<i)))
 966                                 data->disconn_array[i] = 1;
 967         } else
 968                 iwl_find_disconn_antenna(priv, average_sig, data);
 969
 970         /* Analyze noise for rx balance */
 971         average_noise[0] = data->chain_noise_a /
 972                            priv->cfg->base_params->chain_noise_num_beacons;
 973         average_noise[1] = data->chain_noise_b /
 974                            priv->cfg->base_params->chain_noise_num_beacons;
 975         average_noise[2] = data->chain_noise_c /
 976                            priv->cfg->base_params->chain_noise_num_beacons;
 977
 978         for (i = 0; i < NUM_RX_CHAINS; i++) {
 979                 if (!(data->disconn_array[i]) &&
 980                    (average_noise[i] <= min_average_noise)) {
 981                         /* This means that chain i is active and has
 982                          * lower noise values so far: */
 983                         min_average_noise = average_noise[i];
 984                         min_average_noise_antenna_i = i;
 985                 }
 986         }
 987
 988         IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
 989                         average_noise[0], average_noise[1],
 990                         average_noise[2]);
 991
 992         IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
 993                         min_average_noise, min_average_noise_antenna_i);
 994
 995         if (priv->cfg->ops->utils->gain_computation)
 996                 priv->cfg->ops->utils->gain_computation(priv, average_noise,
 997                                 min_average_noise_antenna_i, min_average_noise,
 998                                 find_first_chain(priv->cfg->valid_rx_ant));
 999
1000         /* Some power changes may have been made during the calibration.
1001          * Update and commit the RXON
1002          */
1003         if (priv->cfg->ops->lib->update_chain_flags)
1004                 priv->cfg->ops->lib->update_chain_flags(priv);
1005
1006         data->state = IWL_CHAIN_NOISE_DONE;
1007         iwl_power_update_mode(priv, false);
1008 }
1009
1010 void iwl_reset_run_time_calib(struct iwl_priv *priv)
1011 {
1012         int i;
1013         memset(&(priv->sensitivity_data), 0,
1014                sizeof(struct iwl_sensitivity_data));
1015         memset(&(priv->chain_noise_data), 0,
1016                sizeof(struct iwl_chain_noise_data));
1017         for (i = 0; i < NUM_RX_CHAINS; i++)
1018                 priv->chain_noise_data.delta_gain_code[i] =
1019                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
1020
1021         /* Ask for statistics now, the uCode will send notification
1022          * periodically after association */
1023         iwl_send_statistics_request(priv, CMD_ASYNC, true);
1024 }