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

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
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  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
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  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
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  25  * in the file called LICENSE.GPL.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
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  32  *
  33  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
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  37  * modification, are permitted provided that the following conditions
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  41  *    notice, this list of conditions and the following disclaimer.
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  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
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  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *****************************************************************************/
  62
  63 #include <linux/slab.h>
  64 #include <net/mac80211.h>
  65
  66 #include "iwl-dev.h"
  67 #include "iwl-core.h"
  68 #include "iwl-agn-calib.h"
  69 #include "iwl-trans.h"
  70 #include "iwl-agn.h"
  71
  72 /*****************************************************************************
  73  * INIT calibrations framework
  74  *****************************************************************************/
  75
  76 struct statistics_general_data {
  77         u32 beacon_silence_rssi_a;
  78         u32 beacon_silence_rssi_b;
  79         u32 beacon_silence_rssi_c;
  80         u32 beacon_energy_a;
  81         u32 beacon_energy_b;
  82         u32 beacon_energy_c;
  83 };
  84
  85 int iwl_send_calib_results(struct iwl_priv *priv)
  86 {
  87         int ret = 0;
  88         int i = 0;
  89
  90         struct iwl_host_cmd hcmd = {
  91                 .id = REPLY_PHY_CALIBRATION_CMD,
  92                 .flags = CMD_SYNC,
  93         };
  94
  95         for (i = 0; i < IWL_CALIB_MAX; i++) {
  96                 if ((BIT(i) & priv->hw_params.calib_init_cfg) &&
  97                     priv->calib_results[i].buf) {
  98                         hcmd.len[0] = priv->calib_results[i].buf_len;
  99                         hcmd.data[0] = priv->calib_results[i].buf;
 100                         hcmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
 101                         ret = trans_send_cmd(&priv->trans, &hcmd);
 102                         if (ret) {
 103                                 IWL_ERR(priv, "Error %d iteration %d\n",
 104                                         ret, i);
 105                                 break;
 106                         }
 107                 }
 108         }
 109
 110         return ret;
 111 }
 112
 113 int iwl_calib_set(struct iwl_calib_result *res, const u8 *buf, int len)
 114 {
 115         if (res->buf_len != len) {
 116                 kfree(res->buf);
 117                 res->buf = kzalloc(len, GFP_ATOMIC);
 118         }
 119         if (unlikely(res->buf == NULL))
 120                 return -ENOMEM;
 121
 122         res->buf_len = len;
 123         memcpy(res->buf, buf, len);
 124         return 0;
 125 }
 126
 127 void iwl_calib_free_results(struct iwl_priv *priv)
 128 {
 129         int i;
 130
 131         for (i = 0; i < IWL_CALIB_MAX; i++) {
 132                 kfree(priv->calib_results[i].buf);
 133                 priv->calib_results[i].buf = NULL;
 134                 priv->calib_results[i].buf_len = 0;
 135         }
 136 }
 137
 138 /*****************************************************************************
 139  * RUNTIME calibrations framework
 140  *****************************************************************************/
 141
 142 /* "false alarms" are signals that our DSP tries to lock onto,
 143  *   but then determines that they are either noise, or transmissions
 144  *   from a distant wireless network (also "noise", really) that get
 145  *   "stepped on" by stronger transmissions within our own network.
 146  * This algorithm attempts to set a sensitivity level that is high
 147  *   enough to receive all of our own network traffic, but not so
 148  *   high that our DSP gets too busy trying to lock onto non-network
 149  *   activity/noise. */
 150 static int iwl_sens_energy_cck(struct iwl_priv *priv,
 151                                    u32 norm_fa,
 152                                    u32 rx_enable_time,
 153                                    struct statistics_general_data *rx_info)
 154 {
 155         u32 max_nrg_cck = 0;
 156         int i = 0;
 157         u8 max_silence_rssi = 0;
 158         u32 silence_ref = 0;
 159         u8 silence_rssi_a = 0;
 160         u8 silence_rssi_b = 0;
 161         u8 silence_rssi_c = 0;
 162         u32 val;
 163
 164         /* "false_alarms" values below are cross-multiplications to assess the
 165          *   numbers of false alarms within the measured period of actual Rx
 166          *   (Rx is off when we're txing), vs the min/max expected false alarms
 167          *   (some should be expected if rx is sensitive enough) in a
 168          *   hypothetical listening period of 200 time units (TU), 204.8 msec:
 169          *
 170          * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
 171          *
 172          * */
 173         u32 false_alarms = norm_fa * 200 * 1024;
 174         u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
 175         u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
 176         struct iwl_sensitivity_data *data = NULL;
 177         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 178
 179         data = &(priv->sensitivity_data);
 180
 181         data->nrg_auto_corr_silence_diff = 0;
 182
 183         /* Find max silence rssi among all 3 receivers.
 184          * This is background noise, which may include transmissions from other
 185          *    networks, measured during silence before our network's beacon */
 186         silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
 187                             ALL_BAND_FILTER) >> 8);
 188         silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
 189                             ALL_BAND_FILTER) >> 8);
 190         silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
 191                             ALL_BAND_FILTER) >> 8);
 192
 193         val = max(silence_rssi_b, silence_rssi_c);
 194         max_silence_rssi = max(silence_rssi_a, (u8) val);
 195
 196         /* Store silence rssi in 20-beacon history table */
 197         data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
 198         data->nrg_silence_idx++;
 199         if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
 200                 data->nrg_silence_idx = 0;
 201
 202         /* Find max silence rssi across 20 beacon history */
 203         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
 204                 val = data->nrg_silence_rssi[i];
 205                 silence_ref = max(silence_ref, val);
 206         }
 207         IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",
 208                         silence_rssi_a, silence_rssi_b, silence_rssi_c,
 209                         silence_ref);
 210
 211         /* Find max rx energy (min value!) among all 3 receivers,
 212          *   measured during beacon frame.
 213          * Save it in 10-beacon history table. */
 214         i = data->nrg_energy_idx;
 215         val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
 216         data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
 217
 218         data->nrg_energy_idx++;
 219         if (data->nrg_energy_idx >= 10)
 220                 data->nrg_energy_idx = 0;
 221
 222         /* Find min rx energy (max value) across 10 beacon history.
 223          * This is the minimum signal level that we want to receive well.
 224          * Add backoff (margin so we don't miss slightly lower energy frames).
 225          * This establishes an upper bound (min value) for energy threshold. */
 226         max_nrg_cck = data->nrg_value[0];
 227         for (i = 1; i < 10; i++)
 228                 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
 229         max_nrg_cck += 6;
 230
 231         IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
 232                         rx_info->beacon_energy_a, rx_info->beacon_energy_b,
 233                         rx_info->beacon_energy_c, max_nrg_cck - 6);
 234
 235         /* Count number of consecutive beacons with fewer-than-desired
 236          *   false alarms. */
 237         if (false_alarms < min_false_alarms)
 238                 data->num_in_cck_no_fa++;
 239         else
 240                 data->num_in_cck_no_fa = 0;
 241         IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",
 242                         data->num_in_cck_no_fa);
 243
 244         /* If we got too many false alarms this time, reduce sensitivity */
 245         if ((false_alarms > max_false_alarms) &&
 246                 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
 247                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",
 248                      false_alarms, max_false_alarms);
 249                 IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");
 250                 data->nrg_curr_state = IWL_FA_TOO_MANY;
 251                 /* Store for "fewer than desired" on later beacon */
 252                 data->nrg_silence_ref = silence_ref;
 253
 254                 /* increase energy threshold (reduce nrg value)
 255                  *   to decrease sensitivity */
 256                 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
 257         /* Else if we got fewer than desired, increase sensitivity */
 258         } else if (false_alarms < min_false_alarms) {
 259                 data->nrg_curr_state = IWL_FA_TOO_FEW;
 260
 261                 /* Compare silence level with silence level for most recent
 262                  *   healthy number or too many false alarms */
 263                 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
 264                                                    (s32)silence_ref;
 265
 266                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",
 267                          false_alarms, min_false_alarms,
 268                          data->nrg_auto_corr_silence_diff);
 269
 270                 /* Increase value to increase sensitivity, but only if:
 271                  * 1a) previous beacon did *not* have *too many* false alarms
 272                  * 1b) AND there's a significant difference in Rx levels
 273                  *      from a previous beacon with too many, or healthy # FAs
 274                  * OR 2) We've seen a lot of beacons (100) with too few
 275                  *       false alarms */
 276                 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
 277                         ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 278                         (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 279
 280                         IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");
 281                         /* Increase nrg value to increase sensitivity */
 282                         val = data->nrg_th_cck + NRG_STEP_CCK;
 283                         data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
 284                 } else {
 285                         IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");
 286                 }
 287
 288         /* Else we got a healthy number of false alarms, keep status quo */
 289         } else {
 290                 IWL_DEBUG_CALIB(priv, " FA in safe zone\n");
 291                 data->nrg_curr_state = IWL_FA_GOOD_RANGE;
 292
 293                 /* Store for use in "fewer than desired" with later beacon */
 294                 data->nrg_silence_ref = silence_ref;
 295
 296                 /* If previous beacon had too many false alarms,
 297                  *   give it some extra margin by reducing sensitivity again
 298                  *   (but don't go below measured energy of desired Rx) */
 299                 if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
 300                         IWL_DEBUG_CALIB(priv, "... increasing margin\n");
 301                         if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
 302                                 data->nrg_th_cck -= NRG_MARGIN;
 303                         else
 304                                 data->nrg_th_cck = max_nrg_cck;
 305                 }
 306         }
 307
 308         /* Make sure the energy threshold does not go above the measured
 309          * energy of the desired Rx signals (reduced by backoff margin),
 310          * or else we might start missing Rx frames.
 311          * Lower value is higher energy, so we use max()!
 312          */
 313         data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
 314         IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);
 315
 316         data->nrg_prev_state = data->nrg_curr_state;
 317
 318         /* Auto-correlation CCK algorithm */
 319         if (false_alarms > min_false_alarms) {
 320
 321                 /* increase auto_corr values to decrease sensitivity
 322                  * so the DSP won't be disturbed by the noise
 323                  */
 324                 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
 325                         data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
 326                 else {
 327                         val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
 328                         data->auto_corr_cck =
 329                                 min((u32)ranges->auto_corr_max_cck, val);
 330                 }
 331                 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
 332                 data->auto_corr_cck_mrc =
 333                         min((u32)ranges->auto_corr_max_cck_mrc, val);
 334         } else if ((false_alarms < min_false_alarms) &&
 335            ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
 336            (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
 337
 338                 /* Decrease auto_corr values to increase sensitivity */
 339                 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
 340                 data->auto_corr_cck =
 341                         max((u32)ranges->auto_corr_min_cck, val);
 342                 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
 343                 data->auto_corr_cck_mrc =
 344                         max((u32)ranges->auto_corr_min_cck_mrc, val);
 345         }
 346
 347         return 0;
 348 }
 349
 350
 351 static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
 352                                        u32 norm_fa,
 353                                        u32 rx_enable_time)
 354 {
 355         u32 val;
 356         u32 false_alarms = norm_fa * 200 * 1024;
 357         u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
 358         u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
 359         struct iwl_sensitivity_data *data = NULL;
 360         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 361
 362         data = &(priv->sensitivity_data);
 363
 364         /* If we got too many false alarms this time, reduce sensitivity */
 365         if (false_alarms > max_false_alarms) {
 366
 367                 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",
 368                              false_alarms, max_false_alarms);
 369
 370                 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
 371                 data->auto_corr_ofdm =
 372                         min((u32)ranges->auto_corr_max_ofdm, val);
 373
 374                 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
 375                 data->auto_corr_ofdm_mrc =
 376                         min((u32)ranges->auto_corr_max_ofdm_mrc, val);
 377
 378                 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
 379                 data->auto_corr_ofdm_x1 =
 380                         min((u32)ranges->auto_corr_max_ofdm_x1, val);
 381
 382                 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
 383                 data->auto_corr_ofdm_mrc_x1 =
 384                         min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
 385         }
 386
 387         /* Else if we got fewer than desired, increase sensitivity */
 388         else if (false_alarms < min_false_alarms) {
 389
 390                 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",
 391                              false_alarms, min_false_alarms);
 392
 393                 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
 394                 data->auto_corr_ofdm =
 395                         max((u32)ranges->auto_corr_min_ofdm, val);
 396
 397                 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
 398                 data->auto_corr_ofdm_mrc =
 399                         max((u32)ranges->auto_corr_min_ofdm_mrc, val);
 400
 401                 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
 402                 data->auto_corr_ofdm_x1 =
 403                         max((u32)ranges->auto_corr_min_ofdm_x1, val);
 404
 405                 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
 406                 data->auto_corr_ofdm_mrc_x1 =
 407                         max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
 408         } else {
 409                 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",
 410                          min_false_alarms, false_alarms, max_false_alarms);
 411         }
 412         return 0;
 413 }
 414
 415 static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,
 416                                 struct iwl_sensitivity_data *data,
 417                                 __le16 *tbl)
 418 {
 419         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
 420                                 cpu_to_le16((u16)data->auto_corr_ofdm);
 421         tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
 422                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
 423         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
 424                                 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
 425         tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
 426                                 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
 427
 428         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
 429                                 cpu_to_le16((u16)data->auto_corr_cck);
 430         tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
 431                                 cpu_to_le16((u16)data->auto_corr_cck_mrc);
 432
 433         tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =
 434                                 cpu_to_le16((u16)data->nrg_th_cck);
 435         tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =
 436                                 cpu_to_le16((u16)data->nrg_th_ofdm);
 437
 438         tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
 439                                 cpu_to_le16(data->barker_corr_th_min);
 440         tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
 441                                 cpu_to_le16(data->barker_corr_th_min_mrc);
 442         tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =
 443                                 cpu_to_le16(data->nrg_th_cca);
 444
 445         IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
 446                         data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
 447                         data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
 448                         data->nrg_th_ofdm);
 449
 450         IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",
 451                         data->auto_corr_cck, data->auto_corr_cck_mrc,
 452                         data->nrg_th_cck);
 453 }
 454
 455 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 456 static int iwl_sensitivity_write(struct iwl_priv *priv)
 457 {
 458         struct iwl_sensitivity_cmd cmd;
 459         struct iwl_sensitivity_data *data = NULL;
 460         struct iwl_host_cmd cmd_out = {
 461                 .id = SENSITIVITY_CMD,
 462                 .len = { sizeof(struct iwl_sensitivity_cmd), },
 463                 .flags = CMD_ASYNC,
 464                 .data = { &cmd, },
 465         };
 466
 467         data = &(priv->sensitivity_data);
 468
 469         memset(&cmd, 0, sizeof(cmd));
 470
 471         iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);
 472
 473         /* Update uCode's "work" table, and copy it to DSP */
 474         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 475
 476         /* Don't send command to uCode if nothing has changed */
 477         if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
 478                     sizeof(u16)*HD_TABLE_SIZE)) {
 479                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 480                 return 0;
 481         }
 482
 483         /* Copy table for comparison next time */
 484         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
 485                sizeof(u16)*HD_TABLE_SIZE);
 486
 487         return trans_send_cmd(&priv->trans, &cmd_out);
 488 }
 489
 490 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
 491 static int iwl_enhance_sensitivity_write(struct iwl_priv *priv)
 492 {
 493         struct iwl_enhance_sensitivity_cmd cmd;
 494         struct iwl_sensitivity_data *data = NULL;
 495         struct iwl_host_cmd cmd_out = {
 496                 .id = SENSITIVITY_CMD,
 497                 .len = { sizeof(struct iwl_enhance_sensitivity_cmd), },
 498                 .flags = CMD_ASYNC,
 499                 .data = { &cmd, },
 500         };
 501
 502         data = &(priv->sensitivity_data);
 503
 504         memset(&cmd, 0, sizeof(cmd));
 505
 506         iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.enhance_table[0]);
 507
 508         if (priv->cfg->base_params->hd_v2) {
 509                 cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
 510                         HD_INA_NON_SQUARE_DET_OFDM_DATA_V2;
 511                 cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
 512                         HD_INA_NON_SQUARE_DET_CCK_DATA_V2;
 513                 cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
 514                         HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V2;
 515                 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 516                         HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;
 517                 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 518                         HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;
 519                 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
 520                         HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V2;
 521                 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
 522                         HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V2;
 523                 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 524                         HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;
 525                 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 526                         HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;
 527                 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
 528                         HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V2;
 529                 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
 530                         HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V2;
 531         } else {
 532                 cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =
 533                         HD_INA_NON_SQUARE_DET_OFDM_DATA_V1;
 534                 cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =
 535                         HD_INA_NON_SQUARE_DET_CCK_DATA_V1;
 536                 cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =
 537                         HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V1;
 538                 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 539                         HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;
 540                 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 541                         HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;
 542                 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =
 543                         HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V1;
 544                 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =
 545                         HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V1;
 546                 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =
 547                         HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;
 548                 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =
 549                         HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;
 550                 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =
 551                         HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V1;
 552                 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =
 553                         HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V1;
 554         }
 555
 556         /* Update uCode's "work" table, and copy it to DSP */
 557         cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
 558
 559         /* Don't send command to uCode if nothing has changed */
 560         if (!memcmp(&cmd.enhance_table[0], &(priv->sensitivity_tbl[0]),
 561                     sizeof(u16)*HD_TABLE_SIZE) &&
 562             !memcmp(&cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX],
 563                     &(priv->enhance_sensitivity_tbl[0]),
 564                     sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES)) {
 565                 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");
 566                 return 0;
 567         }
 568
 569         /* Copy table for comparison next time */
 570         memcpy(&(priv->sensitivity_tbl[0]), &(cmd.enhance_table[0]),
 571                sizeof(u16)*HD_TABLE_SIZE);
 572         memcpy(&(priv->enhance_sensitivity_tbl[0]),
 573                &(cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX]),
 574                sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES);
 575
 576         return trans_send_cmd(&priv->trans, &cmd_out);
 577 }
 578
 579 void iwl_init_sensitivity(struct iwl_priv *priv)
 580 {
 581         int ret = 0;
 582         int i;
 583         struct iwl_sensitivity_data *data = NULL;
 584         const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
 585
 586         if (priv->disable_sens_cal)
 587                 return;
 588
 589         IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");
 590
 591         /* Clear driver's sensitivity algo data */
 592         data = &(priv->sensitivity_data);
 593
 594         if (ranges == NULL)
 595                 return;
 596
 597         memset(data, 0, sizeof(struct iwl_sensitivity_data));
 598
 599         data->num_in_cck_no_fa = 0;
 600         data->nrg_curr_state = IWL_FA_TOO_MANY;
 601         data->nrg_prev_state = IWL_FA_TOO_MANY;
 602         data->nrg_silence_ref = 0;
 603         data->nrg_silence_idx = 0;
 604         data->nrg_energy_idx = 0;
 605
 606         for (i = 0; i < 10; i++)
 607                 data->nrg_value[i] = 0;
 608
 609         for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
 610                 data->nrg_silence_rssi[i] = 0;
 611
 612         data->auto_corr_ofdm =  ranges->auto_corr_min_ofdm;
 613         data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
 614         data->auto_corr_ofdm_x1  = ranges->auto_corr_min_ofdm_x1;
 615         data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
 616         data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
 617         data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
 618         data->nrg_th_cck = ranges->nrg_th_cck;
 619         data->nrg_th_ofdm = ranges->nrg_th_ofdm;
 620         data->barker_corr_th_min = ranges->barker_corr_th_min;
 621         data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
 622         data->nrg_th_cca = ranges->nrg_th_cca;
 623
 624         data->last_bad_plcp_cnt_ofdm = 0;
 625         data->last_fa_cnt_ofdm = 0;
 626         data->last_bad_plcp_cnt_cck = 0;
 627         data->last_fa_cnt_cck = 0;
 628
 629         if (priv->enhance_sensitivity_table)
 630                 ret |= iwl_enhance_sensitivity_write(priv);
 631         else
 632                 ret |= iwl_sensitivity_write(priv);
 633         IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);
 634 }
 635
 636 void iwl_sensitivity_calibration(struct iwl_priv *priv)
 637 {
 638         u32 rx_enable_time;
 639         u32 fa_cck;
 640         u32 fa_ofdm;
 641         u32 bad_plcp_cck;
 642         u32 bad_plcp_ofdm;
 643         u32 norm_fa_ofdm;
 644         u32 norm_fa_cck;
 645         struct iwl_sensitivity_data *data = NULL;
 646         struct statistics_rx_non_phy *rx_info;
 647         struct statistics_rx_phy *ofdm, *cck;
 648         unsigned long flags;
 649         struct statistics_general_data statis;
 650
 651         if (priv->disable_sens_cal)
 652                 return;
 653
 654         data = &(priv->sensitivity_data);
 655
 656         if (!iwl_is_any_associated(priv)) {
 657                 IWL_DEBUG_CALIB(priv, "<< - not associated\n");
 658                 return;
 659         }
 660
 661         spin_lock_irqsave(&priv->lock, flags);
 662         rx_info = &priv->statistics.rx_non_phy;
 663         ofdm = &priv->statistics.rx_ofdm;
 664         cck = &priv->statistics.rx_cck;
 665         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 666                 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");
 667                 spin_unlock_irqrestore(&priv->lock, flags);
 668                 return;
 669         }
 670
 671         /* Extract Statistics: */
 672         rx_enable_time = le32_to_cpu(rx_info->channel_load);
 673         fa_cck = le32_to_cpu(cck->false_alarm_cnt);
 674         fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
 675         bad_plcp_cck = le32_to_cpu(cck->plcp_err);
 676         bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
 677
 678         statis.beacon_silence_rssi_a =
 679                         le32_to_cpu(rx_info->beacon_silence_rssi_a);
 680         statis.beacon_silence_rssi_b =
 681                         le32_to_cpu(rx_info->beacon_silence_rssi_b);
 682         statis.beacon_silence_rssi_c =
 683                         le32_to_cpu(rx_info->beacon_silence_rssi_c);
 684         statis.beacon_energy_a =
 685                         le32_to_cpu(rx_info->beacon_energy_a);
 686         statis.beacon_energy_b =
 687                         le32_to_cpu(rx_info->beacon_energy_b);
 688         statis.beacon_energy_c =
 689                         le32_to_cpu(rx_info->beacon_energy_c);
 690
 691         spin_unlock_irqrestore(&priv->lock, flags);
 692
 693         IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);
 694
 695         if (!rx_enable_time) {
 696                 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");
 697                 return;
 698         }
 699
 700         /* These statistics increase monotonically, and do not reset
 701          *   at each beacon.  Calculate difference from last value, or just
 702          *   use the new statistics value if it has reset or wrapped around. */
 703         if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
 704                 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
 705         else {
 706                 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
 707                 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
 708         }
 709
 710         if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
 711                 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
 712         else {
 713                 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
 714                 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
 715         }
 716
 717         if (data->last_fa_cnt_ofdm > fa_ofdm)
 718                 data->last_fa_cnt_ofdm = fa_ofdm;
 719         else {
 720                 fa_ofdm -= data->last_fa_cnt_ofdm;
 721                 data->last_fa_cnt_ofdm += fa_ofdm;
 722         }
 723
 724         if (data->last_fa_cnt_cck > fa_cck)
 725                 data->last_fa_cnt_cck = fa_cck;
 726         else {
 727                 fa_cck -= data->last_fa_cnt_cck;
 728                 data->last_fa_cnt_cck += fa_cck;
 729         }
 730
 731         /* Total aborted signal locks */
 732         norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
 733         norm_fa_cck = fa_cck + bad_plcp_cck;
 734
 735         IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u  ofdm: fa %u badp %u\n", fa_cck,
 736                         bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
 737
 738         iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
 739         iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
 740         if (priv->enhance_sensitivity_table)
 741                 iwl_enhance_sensitivity_write(priv);
 742         else
 743                 iwl_sensitivity_write(priv);
 744 }
 745
 746 static inline u8 find_first_chain(u8 mask)
 747 {
 748         if (mask & ANT_A)
 749                 return CHAIN_A;
 750         if (mask & ANT_B)
 751                 return CHAIN_B;
 752         return CHAIN_C;
 753 }
 754
 755 /**
 756  * Run disconnected antenna algorithm to find out which antennas are
 757  * disconnected.
 758  */
 759 static void iwl_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,
 760                                      struct iwl_chain_noise_data *data)
 761 {
 762         u32 active_chains = 0;
 763         u32 max_average_sig;
 764         u16 max_average_sig_antenna_i;
 765         u8 num_tx_chains;
 766         u8 first_chain;
 767         u16 i = 0;
 768
 769         average_sig[0] = data->chain_signal_a /
 770                          priv->cfg->base_params->chain_noise_num_beacons;
 771         average_sig[1] = data->chain_signal_b /
 772                          priv->cfg->base_params->chain_noise_num_beacons;
 773         average_sig[2] = data->chain_signal_c /
 774                          priv->cfg->base_params->chain_noise_num_beacons;
 775
 776         if (average_sig[0] >= average_sig[1]) {
 777                 max_average_sig = average_sig[0];
 778                 max_average_sig_antenna_i = 0;
 779                 active_chains = (1 << max_average_sig_antenna_i);
 780         } else {
 781                 max_average_sig = average_sig[1];
 782                 max_average_sig_antenna_i = 1;
 783                 active_chains = (1 << max_average_sig_antenna_i);
 784         }
 785
 786         if (average_sig[2] >= max_average_sig) {
 787                 max_average_sig = average_sig[2];
 788                 max_average_sig_antenna_i = 2;
 789                 active_chains = (1 << max_average_sig_antenna_i);
 790         }
 791
 792         IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",
 793                      average_sig[0], average_sig[1], average_sig[2]);
 794         IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",
 795                      max_average_sig, max_average_sig_antenna_i);
 796
 797         /* Compare signal strengths for all 3 receivers. */
 798         for (i = 0; i < NUM_RX_CHAINS; i++) {
 799                 if (i != max_average_sig_antenna_i) {
 800                         s32 rssi_delta = (max_average_sig - average_sig[i]);
 801
 802                         /* If signal is very weak, compared with
 803                          * strongest, mark it as disconnected. */
 804                         if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
 805                                 data->disconn_array[i] = 1;
 806                         else
 807                                 active_chains |= (1 << i);
 808                         IWL_DEBUG_CALIB(priv, "i = %d  rssiDelta = %d  "
 809                              "disconn_array[i] = %d\n",
 810                              i, rssi_delta, data->disconn_array[i]);
 811                 }
 812         }
 813
 814         /*
 815          * The above algorithm sometimes fails when the ucode
 816          * reports 0 for all chains. It's not clear why that
 817          * happens to start with, but it is then causing trouble
 818          * because this can make us enable more chains than the
 819          * hardware really has.
 820          *
 821          * To be safe, simply mask out any chains that we know
 822          * are not on the device.
 823          */
 824         active_chains &= priv->hw_params.valid_rx_ant;
 825
 826         num_tx_chains = 0;
 827         for (i = 0; i < NUM_RX_CHAINS; i++) {
 828                 /* loops on all the bits of
 829                  * priv->hw_setting.valid_tx_ant */
 830                 u8 ant_msk = (1 << i);
 831                 if (!(priv->hw_params.valid_tx_ant & ant_msk))
 832                         continue;
 833
 834                 num_tx_chains++;
 835                 if (data->disconn_array[i] == 0)
 836                         /* there is a Tx antenna connected */
 837                         break;
 838                 if (num_tx_chains == priv->hw_params.tx_chains_num &&
 839                     data->disconn_array[i]) {
 840                         /*
 841                          * If all chains are disconnected
 842                          * connect the first valid tx chain
 843                          */
 844                         first_chain =
 845                                 find_first_chain(priv->cfg->valid_tx_ant);
 846                         data->disconn_array[first_chain] = 0;
 847                         active_chains |= BIT(first_chain);
 848                         IWL_DEBUG_CALIB(priv,
 849                                         "All Tx chains are disconnected W/A - declare %d as connected\n",
 850                                         first_chain);
 851                         break;
 852                 }
 853         }
 854
 855         if (active_chains != priv->hw_params.valid_rx_ant &&
 856             active_chains != priv->chain_noise_data.active_chains)
 857                 IWL_DEBUG_CALIB(priv,
 858                                 "Detected that not all antennas are connected! "
 859                                 "Connected: %#x, valid: %#x.\n",
 860                                 active_chains, priv->hw_params.valid_rx_ant);
 861
 862         /* Save for use within RXON, TX, SCAN commands, etc. */
 863         data->active_chains = active_chains;
 864         IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",
 865                         active_chains);
 866 }
 867
 868 static void iwlagn_gain_computation(struct iwl_priv *priv,
 869                 u32 average_noise[NUM_RX_CHAINS],
 870                 u16 min_average_noise_antenna_i,
 871                 u32 min_average_noise,
 872                 u8 default_chain)
 873 {
 874         int i;
 875         s32 delta_g;
 876         struct iwl_chain_noise_data *data = &priv->chain_noise_data;
 877
 878         /*
 879          * Find Gain Code for the chains based on "default chain"
 880          */
 881         for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {
 882                 if ((data->disconn_array[i])) {
 883                         data->delta_gain_code[i] = 0;
 884                         continue;
 885                 }
 886
 887                 delta_g = (priv->cfg->base_params->chain_noise_scale *
 888                         ((s32)average_noise[default_chain] -
 889                         (s32)average_noise[i])) / 1500;
 890
 891                 /* bound gain by 2 bits value max, 3rd bit is sign */
 892                 data->delta_gain_code[i] =
 893                         min(abs(delta_g),
 894                         (long) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
 895
 896                 if (delta_g < 0)
 897                         /*
 898                          * set negative sign ...
 899                          * note to Intel developers:  This is uCode API format,
 900                          *   not the format of any internal device registers.
 901                          *   Do not change this format for e.g. 6050 or similar
 902                          *   devices.  Change format only if more resolution
 903                          *   (i.e. more than 2 bits magnitude) is needed.
 904                          */
 905                         data->delta_gain_code[i] |= (1 << 2);
 906         }
 907
 908         IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d  ANT_C = %d\n",
 909                         data->delta_gain_code[1], data->delta_gain_code[2]);
 910
 911         if (!data->radio_write) {
 912                 struct iwl_calib_chain_noise_gain_cmd cmd;
 913
 914                 memset(&cmd, 0, sizeof(cmd));
 915
 916                 iwl_set_calib_hdr(&cmd.hdr,
 917                         priv->phy_calib_chain_noise_gain_cmd);
 918                 cmd.delta_gain_1 = data->delta_gain_code[1];
 919                 cmd.delta_gain_2 = data->delta_gain_code[2];
 920                 trans_send_cmd_pdu(&priv->trans, REPLY_PHY_CALIBRATION_CMD,
 921                         CMD_ASYNC, sizeof(cmd), &cmd);
 922
 923                 data->radio_write = 1;
 924                 data->state = IWL_CHAIN_NOISE_CALIBRATED;
 925         }
 926 }
 927
 928 /*
 929  * Accumulate 16 beacons of signal and noise statistics for each of
 930  *   3 receivers/antennas/rx-chains, then figure out:
 931  * 1)  Which antennas are connected.
 932  * 2)  Differential rx gain settings to balance the 3 receivers.
 933  */
 934 void iwl_chain_noise_calibration(struct iwl_priv *priv)
 935 {
 936         struct iwl_chain_noise_data *data = NULL;
 937
 938         u32 chain_noise_a;
 939         u32 chain_noise_b;
 940         u32 chain_noise_c;
 941         u32 chain_sig_a;
 942         u32 chain_sig_b;
 943         u32 chain_sig_c;
 944         u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 945         u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
 946         u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
 947         u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
 948         u16 i = 0;
 949         u16 rxon_chnum = INITIALIZATION_VALUE;
 950         u16 stat_chnum = INITIALIZATION_VALUE;
 951         u8 rxon_band24;
 952         u8 stat_band24;
 953         unsigned long flags;
 954         struct statistics_rx_non_phy *rx_info;
 955
 956         /*
 957          * MULTI-FIXME:
 958          * When we support multiple interfaces on different channels,
 959          * this must be modified/fixed.
 960          */
 961         struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
 962
 963         if (priv->disable_chain_noise_cal)
 964                 return;
 965
 966         data = &(priv->chain_noise_data);
 967
 968         /*
 969          * Accumulate just the first "chain_noise_num_beacons" after
 970          * the first association, then we're done forever.
 971          */
 972         if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
 973                 if (data->state == IWL_CHAIN_NOISE_ALIVE)
 974                         IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");
 975                 return;
 976         }
 977
 978         spin_lock_irqsave(&priv->lock, flags);
 979
 980         rx_info = &priv->statistics.rx_non_phy;
 981
 982         if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
 983                 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");
 984                 spin_unlock_irqrestore(&priv->lock, flags);
 985                 return;
 986         }
 987
 988         rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
 989         rxon_chnum = le16_to_cpu(ctx->staging.channel);
 990         stat_band24 =
 991                 !!(priv->statistics.flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
 992         stat_chnum = le32_to_cpu(priv->statistics.flag) >> 16;
 993
 994         /* Make sure we accumulate data for just the associated channel
 995          *   (even if scanning). */
 996         if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
 997                 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",
 998                                 rxon_chnum, rxon_band24);
 999                 spin_unlock_irqrestore(&priv->lock, flags);
1000                 return;
1001         }
1002
1003         /*
1004          *  Accumulate beacon statistics values across
1005          * "chain_noise_num_beacons"
1006          */
1007         chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
1008                                 IN_BAND_FILTER;
1009         chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
1010                                 IN_BAND_FILTER;
1011         chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
1012                                 IN_BAND_FILTER;
1013
1014         chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
1015         chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
1016         chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
1017
1018         spin_unlock_irqrestore(&priv->lock, flags);
1019
1020         data->beacon_count++;
1021
1022         data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
1023         data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
1024         data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
1025
1026         data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
1027         data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
1028         data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
1029
1030         IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",
1031                         rxon_chnum, rxon_band24, data->beacon_count);
1032         IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",
1033                         chain_sig_a, chain_sig_b, chain_sig_c);
1034         IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",
1035                         chain_noise_a, chain_noise_b, chain_noise_c);
1036
1037         /* If this is the "chain_noise_num_beacons", determine:
1038          * 1)  Disconnected antennas (using signal strengths)
1039          * 2)  Differential gain (using silence noise) to balance receivers */
1040         if (data->beacon_count !=
1041                 priv->cfg->base_params->chain_noise_num_beacons)
1042                 return;
1043
1044         /* Analyze signal for disconnected antenna */
1045         if (priv->cfg->bt_params &&
1046             priv->cfg->bt_params->advanced_bt_coexist) {
1047                 /* Disable disconnected antenna algorithm for advanced
1048                    bt coex, assuming valid antennas are connected */
1049                 data->active_chains = priv->hw_params.valid_rx_ant;
1050                 for (i = 0; i < NUM_RX_CHAINS; i++)
1051                         if (!(data->active_chains & (1<<i)))
1052                                 data->disconn_array[i] = 1;
1053         } else
1054                 iwl_find_disconn_antenna(priv, average_sig, data);
1055
1056         /* Analyze noise for rx balance */
1057         average_noise[0] = data->chain_noise_a /
1058                            priv->cfg->base_params->chain_noise_num_beacons;
1059         average_noise[1] = data->chain_noise_b /
1060                            priv->cfg->base_params->chain_noise_num_beacons;
1061         average_noise[2] = data->chain_noise_c /
1062                            priv->cfg->base_params->chain_noise_num_beacons;
1063
1064         for (i = 0; i < NUM_RX_CHAINS; i++) {
1065                 if (!(data->disconn_array[i]) &&
1066                    (average_noise[i] <= min_average_noise)) {
1067                         /* This means that chain i is active and has
1068                          * lower noise values so far: */
1069                         min_average_noise = average_noise[i];
1070                         min_average_noise_antenna_i = i;
1071                 }
1072         }
1073
1074         IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",
1075                         average_noise[0], average_noise[1],
1076                         average_noise[2]);
1077
1078         IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",
1079                         min_average_noise, min_average_noise_antenna_i);
1080
1081         iwlagn_gain_computation(priv, average_noise,
1082                                 min_average_noise_antenna_i, min_average_noise,
1083                                 find_first_chain(priv->cfg->valid_rx_ant));
1084
1085         /* Some power changes may have been made during the calibration.
1086          * Update and commit the RXON
1087          */
1088         iwl_update_chain_flags(priv);
1089
1090         data->state = IWL_CHAIN_NOISE_DONE;
1091         iwl_power_update_mode(priv, false);
1092 }
1093
1094 void iwl_reset_run_time_calib(struct iwl_priv *priv)
1095 {
1096         int i;
1097         memset(&(priv->sensitivity_data), 0,
1098                sizeof(struct iwl_sensitivity_data));
1099         memset(&(priv->chain_noise_data), 0,
1100                sizeof(struct iwl_chain_noise_data));
1101         for (i = 0; i < NUM_RX_CHAINS; i++)
1102                 priv->chain_noise_data.delta_gain_code[i] =
1103                                 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
1104
1105         /* Ask for statistics now, the uCode will send notification
1106          * periodically after association */
1107         iwl_send_statistics_request(priv, CMD_ASYNC, true);
1108 }