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