kernel/drivers/net/wireless/iwlwifi/dvm/calib.c

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