1057 lines · c
1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause2/*3 * Copyright (C) 2005-2014 Intel Corporation4 */5#include <linux/slab.h>6#include <net/mac80211.h>7 8#include "iwl-trans.h"9 10#include "dev.h"11#include "calib.h"12#include "agn.h"13 14/*****************************************************************************15 * INIT calibrations framework16 *****************************************************************************/17 18/* Opaque calibration results */19struct iwl_calib_result {20 struct list_head list;21 size_t cmd_len;22 struct iwl_calib_cmd cmd;23};24 25struct statistics_general_data {26 u32 beacon_silence_rssi_a;27 u32 beacon_silence_rssi_b;28 u32 beacon_silence_rssi_c;29 u32 beacon_energy_a;30 u32 beacon_energy_b;31 u32 beacon_energy_c;32};33 34int iwl_send_calib_results(struct iwl_priv *priv)35{36 struct iwl_host_cmd hcmd = {37 .id = REPLY_PHY_CALIBRATION_CMD,38 };39 struct iwl_calib_result *res;40 41 list_for_each_entry(res, &priv->calib_results, list) {42 int ret;43 44 hcmd.len[0] = res->cmd_len;45 hcmd.data[0] = &res->cmd;46 hcmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;47 ret = iwl_dvm_send_cmd(priv, &hcmd);48 if (ret) {49 IWL_ERR(priv, "Error %d on calib cmd %d\n",50 ret, res->cmd.hdr.op_code);51 return ret;52 }53 }54 55 return 0;56}57 58int iwl_calib_set(struct iwl_priv *priv,59 const struct iwl_calib_cmd *cmd, size_t len)60{61 struct iwl_calib_result *res, *tmp;62 63 if (check_sub_overflow(len, sizeof(*cmd), &len))64 return -ENOMEM;65 66 res = kmalloc(struct_size(res, cmd.data, len), GFP_ATOMIC);67 if (!res)68 return -ENOMEM;69 res->cmd = *cmd;70 memcpy(res->cmd.data, cmd->data, len);71 res->cmd_len = struct_size(cmd, data, len);72 73 list_for_each_entry(tmp, &priv->calib_results, list) {74 if (tmp->cmd.hdr.op_code == res->cmd.hdr.op_code) {75 list_replace(&tmp->list, &res->list);76 kfree(tmp);77 return 0;78 }79 }80 81 /* wasn't in list already */82 list_add_tail(&res->list, &priv->calib_results);83 84 return 0;85}86 87void iwl_calib_free_results(struct iwl_priv *priv)88{89 struct iwl_calib_result *res, *tmp;90 91 list_for_each_entry_safe(res, tmp, &priv->calib_results, list) {92 list_del(&res->list);93 kfree(res);94 }95}96 97/*****************************************************************************98 * RUNTIME calibrations framework99 *****************************************************************************/100 101/* "false alarms" are signals that our DSP tries to lock onto,102 * but then determines that they are either noise, or transmissions103 * from a distant wireless network (also "noise", really) that get104 * "stepped on" by stronger transmissions within our own network.105 * This algorithm attempts to set a sensitivity level that is high106 * enough to receive all of our own network traffic, but not so107 * high that our DSP gets too busy trying to lock onto non-network108 * activity/noise. */109static int iwl_sens_energy_cck(struct iwl_priv *priv,110 u32 norm_fa,111 u32 rx_enable_time,112 struct statistics_general_data *rx_info)113{114 u32 max_nrg_cck = 0;115 int i = 0;116 u8 max_silence_rssi = 0;117 u32 silence_ref = 0;118 u8 silence_rssi_a = 0;119 u8 silence_rssi_b = 0;120 u8 silence_rssi_c = 0;121 u32 val;122 123 /* "false_alarms" values below are cross-multiplications to assess the124 * numbers of false alarms within the measured period of actual Rx125 * (Rx is off when we're txing), vs the min/max expected false alarms126 * (some should be expected if rx is sensitive enough) in a127 * hypothetical listening period of 200 time units (TU), 204.8 msec:128 *129 * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time130 *131 * */132 u32 false_alarms = norm_fa * 200 * 1024;133 u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;134 u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;135 struct iwl_sensitivity_data *data = NULL;136 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;137 138 data = &(priv->sensitivity_data);139 140 data->nrg_auto_corr_silence_diff = 0;141 142 /* Find max silence rssi among all 3 receivers.143 * This is background noise, which may include transmissions from other144 * networks, measured during silence before our network's beacon */145 silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &146 ALL_BAND_FILTER) >> 8);147 silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &148 ALL_BAND_FILTER) >> 8);149 silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &150 ALL_BAND_FILTER) >> 8);151 152 val = max(silence_rssi_b, silence_rssi_c);153 max_silence_rssi = max(silence_rssi_a, (u8) val);154 155 /* Store silence rssi in 20-beacon history table */156 data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;157 data->nrg_silence_idx++;158 if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)159 data->nrg_silence_idx = 0;160 161 /* Find max silence rssi across 20 beacon history */162 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {163 val = data->nrg_silence_rssi[i];164 silence_ref = max(silence_ref, val);165 }166 IWL_DEBUG_CALIB(priv, "silence a %u, b %u, c %u, 20-bcn max %u\n",167 silence_rssi_a, silence_rssi_b, silence_rssi_c,168 silence_ref);169 170 /* Find max rx energy (min value!) among all 3 receivers,171 * measured during beacon frame.172 * Save it in 10-beacon history table. */173 i = data->nrg_energy_idx;174 val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);175 data->nrg_value[i] = min(rx_info->beacon_energy_a, val);176 177 data->nrg_energy_idx++;178 if (data->nrg_energy_idx >= 10)179 data->nrg_energy_idx = 0;180 181 /* Find min rx energy (max value) across 10 beacon history.182 * This is the minimum signal level that we want to receive well.183 * Add backoff (margin so we don't miss slightly lower energy frames).184 * This establishes an upper bound (min value) for energy threshold. */185 max_nrg_cck = data->nrg_value[0];186 for (i = 1; i < 10; i++)187 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));188 max_nrg_cck += 6;189 190 IWL_DEBUG_CALIB(priv, "rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",191 rx_info->beacon_energy_a, rx_info->beacon_energy_b,192 rx_info->beacon_energy_c, max_nrg_cck - 6);193 194 /* Count number of consecutive beacons with fewer-than-desired195 * false alarms. */196 if (false_alarms < min_false_alarms)197 data->num_in_cck_no_fa++;198 else199 data->num_in_cck_no_fa = 0;200 IWL_DEBUG_CALIB(priv, "consecutive bcns with few false alarms = %u\n",201 data->num_in_cck_no_fa);202 203 /* If we got too many false alarms this time, reduce sensitivity */204 if ((false_alarms > max_false_alarms) &&205 (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {206 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u\n",207 false_alarms, max_false_alarms);208 IWL_DEBUG_CALIB(priv, "... reducing sensitivity\n");209 data->nrg_curr_state = IWL_FA_TOO_MANY;210 /* Store for "fewer than desired" on later beacon */211 data->nrg_silence_ref = silence_ref;212 213 /* increase energy threshold (reduce nrg value)214 * to decrease sensitivity */215 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;216 /* Else if we got fewer than desired, increase sensitivity */217 } else if (false_alarms < min_false_alarms) {218 data->nrg_curr_state = IWL_FA_TOO_FEW;219 220 /* Compare silence level with silence level for most recent221 * healthy number or too many false alarms */222 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -223 (s32)silence_ref;224 225 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u, silence diff %d\n",226 false_alarms, min_false_alarms,227 data->nrg_auto_corr_silence_diff);228 229 /* Increase value to increase sensitivity, but only if:230 * 1a) previous beacon did *not* have *too many* false alarms231 * 1b) AND there's a significant difference in Rx levels232 * from a previous beacon with too many, or healthy # FAs233 * OR 2) We've seen a lot of beacons (100) with too few234 * false alarms */235 if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&236 ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||237 (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {238 239 IWL_DEBUG_CALIB(priv, "... increasing sensitivity\n");240 /* Increase nrg value to increase sensitivity */241 val = data->nrg_th_cck + NRG_STEP_CCK;242 data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);243 } else {244 IWL_DEBUG_CALIB(priv, "... but not changing sensitivity\n");245 }246 247 /* Else we got a healthy number of false alarms, keep status quo */248 } else {249 IWL_DEBUG_CALIB(priv, " FA in safe zone\n");250 data->nrg_curr_state = IWL_FA_GOOD_RANGE;251 252 /* Store for use in "fewer than desired" with later beacon */253 data->nrg_silence_ref = silence_ref;254 255 /* If previous beacon had too many false alarms,256 * give it some extra margin by reducing sensitivity again257 * (but don't go below measured energy of desired Rx) */258 if (data->nrg_prev_state == IWL_FA_TOO_MANY) {259 IWL_DEBUG_CALIB(priv, "... increasing margin\n");260 if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))261 data->nrg_th_cck -= NRG_MARGIN;262 else263 data->nrg_th_cck = max_nrg_cck;264 }265 }266 267 /* Make sure the energy threshold does not go above the measured268 * energy of the desired Rx signals (reduced by backoff margin),269 * or else we might start missing Rx frames.270 * Lower value is higher energy, so we use max()!271 */272 data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);273 IWL_DEBUG_CALIB(priv, "new nrg_th_cck %u\n", data->nrg_th_cck);274 275 data->nrg_prev_state = data->nrg_curr_state;276 277 /* Auto-correlation CCK algorithm */278 if (false_alarms > min_false_alarms) {279 280 /* increase auto_corr values to decrease sensitivity281 * so the DSP won't be disturbed by the noise282 */283 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)284 data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;285 else {286 val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;287 data->auto_corr_cck =288 min((u32)ranges->auto_corr_max_cck, val);289 }290 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;291 data->auto_corr_cck_mrc =292 min((u32)ranges->auto_corr_max_cck_mrc, val);293 } else if ((false_alarms < min_false_alarms) &&294 ((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||295 (data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {296 297 /* Decrease auto_corr values to increase sensitivity */298 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;299 data->auto_corr_cck =300 max((u32)ranges->auto_corr_min_cck, val);301 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;302 data->auto_corr_cck_mrc =303 max((u32)ranges->auto_corr_min_cck_mrc, val);304 }305 306 return 0;307}308 309 310static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,311 u32 norm_fa,312 u32 rx_enable_time)313{314 u32 val;315 u32 false_alarms = norm_fa * 200 * 1024;316 u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;317 u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;318 struct iwl_sensitivity_data *data = NULL;319 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;320 321 data = &(priv->sensitivity_data);322 323 /* If we got too many false alarms this time, reduce sensitivity */324 if (false_alarms > max_false_alarms) {325 326 IWL_DEBUG_CALIB(priv, "norm FA %u > max FA %u)\n",327 false_alarms, max_false_alarms);328 329 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;330 data->auto_corr_ofdm =331 min((u32)ranges->auto_corr_max_ofdm, val);332 333 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;334 data->auto_corr_ofdm_mrc =335 min((u32)ranges->auto_corr_max_ofdm_mrc, val);336 337 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;338 data->auto_corr_ofdm_x1 =339 min((u32)ranges->auto_corr_max_ofdm_x1, val);340 341 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;342 data->auto_corr_ofdm_mrc_x1 =343 min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);344 }345 346 /* Else if we got fewer than desired, increase sensitivity */347 else if (false_alarms < min_false_alarms) {348 349 IWL_DEBUG_CALIB(priv, "norm FA %u < min FA %u\n",350 false_alarms, min_false_alarms);351 352 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;353 data->auto_corr_ofdm =354 max((u32)ranges->auto_corr_min_ofdm, val);355 356 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;357 data->auto_corr_ofdm_mrc =358 max((u32)ranges->auto_corr_min_ofdm_mrc, val);359 360 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;361 data->auto_corr_ofdm_x1 =362 max((u32)ranges->auto_corr_min_ofdm_x1, val);363 364 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;365 data->auto_corr_ofdm_mrc_x1 =366 max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);367 } else {368 IWL_DEBUG_CALIB(priv, "min FA %u < norm FA %u < max FA %u OK\n",369 min_false_alarms, false_alarms, max_false_alarms);370 }371 return 0;372}373 374static void iwl_prepare_legacy_sensitivity_tbl(struct iwl_priv *priv,375 struct iwl_sensitivity_data *data,376 __le16 *tbl)377{378 tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =379 cpu_to_le16((u16)data->auto_corr_ofdm);380 tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =381 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);382 tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =383 cpu_to_le16((u16)data->auto_corr_ofdm_x1);384 tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =385 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);386 387 tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =388 cpu_to_le16((u16)data->auto_corr_cck);389 tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =390 cpu_to_le16((u16)data->auto_corr_cck_mrc);391 392 tbl[HD_MIN_ENERGY_CCK_DET_INDEX] =393 cpu_to_le16((u16)data->nrg_th_cck);394 tbl[HD_MIN_ENERGY_OFDM_DET_INDEX] =395 cpu_to_le16((u16)data->nrg_th_ofdm);396 397 tbl[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =398 cpu_to_le16(data->barker_corr_th_min);399 tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =400 cpu_to_le16(data->barker_corr_th_min_mrc);401 tbl[HD_OFDM_ENERGY_TH_IN_INDEX] =402 cpu_to_le16(data->nrg_th_cca);403 404 IWL_DEBUG_CALIB(priv, "ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",405 data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,406 data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,407 data->nrg_th_ofdm);408 409 IWL_DEBUG_CALIB(priv, "cck: ac %u mrc %u thresh %u\n",410 data->auto_corr_cck, data->auto_corr_cck_mrc,411 data->nrg_th_cck);412}413 414/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */415static int iwl_sensitivity_write(struct iwl_priv *priv)416{417 struct iwl_sensitivity_cmd cmd;418 struct iwl_sensitivity_data *data = NULL;419 struct iwl_host_cmd cmd_out = {420 .id = SENSITIVITY_CMD,421 .len = { sizeof(struct iwl_sensitivity_cmd), },422 .flags = CMD_ASYNC,423 .data = { &cmd, },424 };425 426 data = &(priv->sensitivity_data);427 428 memset(&cmd, 0, sizeof(cmd));429 430 iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.table[0]);431 432 /* Update uCode's "work" table, and copy it to DSP */433 cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;434 435 /* Don't send command to uCode if nothing has changed */436 if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),437 sizeof(u16)*HD_TABLE_SIZE)) {438 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");439 return 0;440 }441 442 /* Copy table for comparison next time */443 memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),444 sizeof(u16)*HD_TABLE_SIZE);445 446 return iwl_dvm_send_cmd(priv, &cmd_out);447}448 449/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */450static int iwl_enhance_sensitivity_write(struct iwl_priv *priv)451{452 struct iwl_enhance_sensitivity_cmd cmd;453 struct iwl_sensitivity_data *data = NULL;454 struct iwl_host_cmd cmd_out = {455 .id = SENSITIVITY_CMD,456 .len = { sizeof(struct iwl_enhance_sensitivity_cmd), },457 .flags = CMD_ASYNC,458 .data = { &cmd, },459 };460 461 data = &(priv->sensitivity_data);462 463 memset(&cmd, 0, sizeof(cmd));464 465 iwl_prepare_legacy_sensitivity_tbl(priv, data, &cmd.enhance_table[0]);466 467 if (priv->lib->hd_v2) {468 cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =469 HD_INA_NON_SQUARE_DET_OFDM_DATA_V2;470 cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =471 HD_INA_NON_SQUARE_DET_CCK_DATA_V2;472 cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =473 HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V2;474 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =475 HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;476 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =477 HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;478 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =479 HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V2;480 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =481 HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V2;482 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =483 HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V2;484 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =485 HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V2;486 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =487 HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V2;488 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =489 HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V2;490 } else {491 cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX] =492 HD_INA_NON_SQUARE_DET_OFDM_DATA_V1;493 cmd.enhance_table[HD_INA_NON_SQUARE_DET_CCK_INDEX] =494 HD_INA_NON_SQUARE_DET_CCK_DATA_V1;495 cmd.enhance_table[HD_CORR_11_INSTEAD_OF_CORR_9_EN_INDEX] =496 HD_CORR_11_INSTEAD_OF_CORR_9_EN_DATA_V1;497 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_INDEX] =498 HD_OFDM_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;499 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =500 HD_OFDM_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;501 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_SLOPE_INDEX] =502 HD_OFDM_NON_SQUARE_DET_SLOPE_DATA_V1;503 cmd.enhance_table[HD_OFDM_NON_SQUARE_DET_INTERCEPT_INDEX] =504 HD_OFDM_NON_SQUARE_DET_INTERCEPT_DATA_V1;505 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_MRC_INDEX] =506 HD_CCK_NON_SQUARE_DET_SLOPE_MRC_DATA_V1;507 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_INDEX] =508 HD_CCK_NON_SQUARE_DET_INTERCEPT_MRC_DATA_V1;509 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_SLOPE_INDEX] =510 HD_CCK_NON_SQUARE_DET_SLOPE_DATA_V1;511 cmd.enhance_table[HD_CCK_NON_SQUARE_DET_INTERCEPT_INDEX] =512 HD_CCK_NON_SQUARE_DET_INTERCEPT_DATA_V1;513 }514 515 /* Update uCode's "work" table, and copy it to DSP */516 cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;517 518 /* Don't send command to uCode if nothing has changed */519 if (!memcmp(&cmd.enhance_table[0], &(priv->sensitivity_tbl[0]),520 sizeof(u16)*HD_TABLE_SIZE) &&521 !memcmp(&cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX],522 &(priv->enhance_sensitivity_tbl[0]),523 sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES)) {524 IWL_DEBUG_CALIB(priv, "No change in SENSITIVITY_CMD\n");525 return 0;526 }527 528 /* Copy table for comparison next time */529 memcpy(&(priv->sensitivity_tbl[0]), &(cmd.enhance_table[0]),530 sizeof(u16)*HD_TABLE_SIZE);531 memcpy(&(priv->enhance_sensitivity_tbl[0]),532 &(cmd.enhance_table[HD_INA_NON_SQUARE_DET_OFDM_INDEX]),533 sizeof(u16)*ENHANCE_HD_TABLE_ENTRIES);534 535 return iwl_dvm_send_cmd(priv, &cmd_out);536}537 538void iwl_init_sensitivity(struct iwl_priv *priv)539{540 int ret = 0;541 int i;542 struct iwl_sensitivity_data *data = NULL;543 const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;544 545 if (priv->calib_disabled & IWL_SENSITIVITY_CALIB_DISABLED)546 return;547 548 IWL_DEBUG_CALIB(priv, "Start iwl_init_sensitivity\n");549 550 /* Clear driver's sensitivity algo data */551 data = &(priv->sensitivity_data);552 553 if (ranges == NULL)554 return;555 556 memset(data, 0, sizeof(struct iwl_sensitivity_data));557 558 data->num_in_cck_no_fa = 0;559 data->nrg_curr_state = IWL_FA_TOO_MANY;560 data->nrg_prev_state = IWL_FA_TOO_MANY;561 data->nrg_silence_ref = 0;562 data->nrg_silence_idx = 0;563 data->nrg_energy_idx = 0;564 565 for (i = 0; i < 10; i++)566 data->nrg_value[i] = 0;567 568 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)569 data->nrg_silence_rssi[i] = 0;570 571 data->auto_corr_ofdm = ranges->auto_corr_min_ofdm;572 data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;573 data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1;574 data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;575 data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;576 data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;577 data->nrg_th_cck = ranges->nrg_th_cck;578 data->nrg_th_ofdm = ranges->nrg_th_ofdm;579 data->barker_corr_th_min = ranges->barker_corr_th_min;580 data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;581 data->nrg_th_cca = ranges->nrg_th_cca;582 583 data->last_bad_plcp_cnt_ofdm = 0;584 data->last_fa_cnt_ofdm = 0;585 data->last_bad_plcp_cnt_cck = 0;586 data->last_fa_cnt_cck = 0;587 588 if (priv->fw->enhance_sensitivity_table)589 ret |= iwl_enhance_sensitivity_write(priv);590 else591 ret |= iwl_sensitivity_write(priv);592 IWL_DEBUG_CALIB(priv, "<<return 0x%X\n", ret);593}594 595void iwl_sensitivity_calibration(struct iwl_priv *priv)596{597 u32 rx_enable_time;598 u32 fa_cck;599 u32 fa_ofdm;600 u32 bad_plcp_cck;601 u32 bad_plcp_ofdm;602 u32 norm_fa_ofdm;603 u32 norm_fa_cck;604 struct iwl_sensitivity_data *data = NULL;605 struct statistics_rx_non_phy *rx_info;606 struct statistics_rx_phy *ofdm, *cck;607 struct statistics_general_data statis;608 609 if (priv->calib_disabled & IWL_SENSITIVITY_CALIB_DISABLED)610 return;611 612 data = &(priv->sensitivity_data);613 614 if (!iwl_is_any_associated(priv)) {615 IWL_DEBUG_CALIB(priv, "<< - not associated\n");616 return;617 }618 619 spin_lock_bh(&priv->statistics.lock);620 rx_info = &priv->statistics.rx_non_phy;621 ofdm = &priv->statistics.rx_ofdm;622 cck = &priv->statistics.rx_cck;623 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {624 IWL_DEBUG_CALIB(priv, "<< invalid data.\n");625 spin_unlock_bh(&priv->statistics.lock);626 return;627 }628 629 /* Extract Statistics: */630 rx_enable_time = le32_to_cpu(rx_info->channel_load);631 fa_cck = le32_to_cpu(cck->false_alarm_cnt);632 fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);633 bad_plcp_cck = le32_to_cpu(cck->plcp_err);634 bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);635 636 statis.beacon_silence_rssi_a =637 le32_to_cpu(rx_info->beacon_silence_rssi_a);638 statis.beacon_silence_rssi_b =639 le32_to_cpu(rx_info->beacon_silence_rssi_b);640 statis.beacon_silence_rssi_c =641 le32_to_cpu(rx_info->beacon_silence_rssi_c);642 statis.beacon_energy_a =643 le32_to_cpu(rx_info->beacon_energy_a);644 statis.beacon_energy_b =645 le32_to_cpu(rx_info->beacon_energy_b);646 statis.beacon_energy_c =647 le32_to_cpu(rx_info->beacon_energy_c);648 649 spin_unlock_bh(&priv->statistics.lock);650 651 IWL_DEBUG_CALIB(priv, "rx_enable_time = %u usecs\n", rx_enable_time);652 653 if (!rx_enable_time) {654 IWL_DEBUG_CALIB(priv, "<< RX Enable Time == 0!\n");655 return;656 }657 658 /* These statistics increase monotonically, and do not reset659 * at each beacon. Calculate difference from last value, or just660 * use the new statistics value if it has reset or wrapped around. */661 if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)662 data->last_bad_plcp_cnt_cck = bad_plcp_cck;663 else {664 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;665 data->last_bad_plcp_cnt_cck += bad_plcp_cck;666 }667 668 if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)669 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;670 else {671 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;672 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;673 }674 675 if (data->last_fa_cnt_ofdm > fa_ofdm)676 data->last_fa_cnt_ofdm = fa_ofdm;677 else {678 fa_ofdm -= data->last_fa_cnt_ofdm;679 data->last_fa_cnt_ofdm += fa_ofdm;680 }681 682 if (data->last_fa_cnt_cck > fa_cck)683 data->last_fa_cnt_cck = fa_cck;684 else {685 fa_cck -= data->last_fa_cnt_cck;686 data->last_fa_cnt_cck += fa_cck;687 }688 689 /* Total aborted signal locks */690 norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;691 norm_fa_cck = fa_cck + bad_plcp_cck;692 693 IWL_DEBUG_CALIB(priv, "cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck,694 bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);695 696 iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);697 iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);698 if (priv->fw->enhance_sensitivity_table)699 iwl_enhance_sensitivity_write(priv);700 else701 iwl_sensitivity_write(priv);702}703 704static inline u8 find_first_chain(u8 mask)705{706 if (mask & ANT_A)707 return CHAIN_A;708 if (mask & ANT_B)709 return CHAIN_B;710 return CHAIN_C;711}712 713/*714 * Run disconnected antenna algorithm to find out which antennas are715 * disconnected.716 */717static void iwl_find_disconn_antenna(struct iwl_priv *priv, u32* average_sig,718 struct iwl_chain_noise_data *data)719{720 u32 active_chains = 0;721 u32 max_average_sig;722 u16 max_average_sig_antenna_i;723 u8 num_tx_chains;724 u8 first_chain;725 u16 i = 0;726 727 average_sig[0] = data->chain_signal_a / IWL_CAL_NUM_BEACONS;728 average_sig[1] = data->chain_signal_b / IWL_CAL_NUM_BEACONS;729 average_sig[2] = data->chain_signal_c / IWL_CAL_NUM_BEACONS;730 731 if (average_sig[0] >= average_sig[1]) {732 max_average_sig = average_sig[0];733 max_average_sig_antenna_i = 0;734 active_chains = (1 << max_average_sig_antenna_i);735 } else {736 max_average_sig = average_sig[1];737 max_average_sig_antenna_i = 1;738 active_chains = (1 << max_average_sig_antenna_i);739 }740 741 if (average_sig[2] >= max_average_sig) {742 max_average_sig = average_sig[2];743 max_average_sig_antenna_i = 2;744 active_chains = (1 << max_average_sig_antenna_i);745 }746 747 IWL_DEBUG_CALIB(priv, "average_sig: a %d b %d c %d\n",748 average_sig[0], average_sig[1], average_sig[2]);749 IWL_DEBUG_CALIB(priv, "max_average_sig = %d, antenna %d\n",750 max_average_sig, max_average_sig_antenna_i);751 752 /* Compare signal strengths for all 3 receivers. */753 for (i = 0; i < NUM_RX_CHAINS; i++) {754 if (i != max_average_sig_antenna_i) {755 s32 rssi_delta = (max_average_sig - average_sig[i]);756 757 /* If signal is very weak, compared with758 * strongest, mark it as disconnected. */759 if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)760 data->disconn_array[i] = 1;761 else762 active_chains |= (1 << i);763 IWL_DEBUG_CALIB(priv, "i = %d rssiDelta = %d "764 "disconn_array[i] = %d\n",765 i, rssi_delta, data->disconn_array[i]);766 }767 }768 769 /*770 * The above algorithm sometimes fails when the ucode771 * reports 0 for all chains. It's not clear why that772 * happens to start with, but it is then causing trouble773 * because this can make us enable more chains than the774 * hardware really has.775 *776 * To be safe, simply mask out any chains that we know777 * are not on the device.778 */779 active_chains &= priv->nvm_data->valid_rx_ant;780 781 num_tx_chains = 0;782 for (i = 0; i < NUM_RX_CHAINS; i++) {783 /* loops on all the bits of784 * priv->hw_setting.valid_tx_ant */785 u8 ant_msk = (1 << i);786 if (!(priv->nvm_data->valid_tx_ant & ant_msk))787 continue;788 789 num_tx_chains++;790 if (data->disconn_array[i] == 0)791 /* there is a Tx antenna connected */792 break;793 if (num_tx_chains == priv->hw_params.tx_chains_num &&794 data->disconn_array[i]) {795 /*796 * If all chains are disconnected797 * connect the first valid tx chain798 */799 first_chain =800 find_first_chain(priv->nvm_data->valid_tx_ant);801 data->disconn_array[first_chain] = 0;802 active_chains |= BIT(first_chain);803 IWL_DEBUG_CALIB(priv,804 "All Tx chains are disconnected W/A - declare %d as connected\n",805 first_chain);806 break;807 }808 }809 810 if (active_chains != priv->nvm_data->valid_rx_ant &&811 active_chains != priv->chain_noise_data.active_chains)812 IWL_DEBUG_CALIB(priv,813 "Detected that not all antennas are connected! "814 "Connected: %#x, valid: %#x.\n",815 active_chains,816 priv->nvm_data->valid_rx_ant);817 818 /* Save for use within RXON, TX, SCAN commands, etc. */819 data->active_chains = active_chains;820 IWL_DEBUG_CALIB(priv, "active_chains (bitwise) = 0x%x\n",821 active_chains);822}823 824static void iwlagn_gain_computation(struct iwl_priv *priv,825 u32 average_noise[NUM_RX_CHAINS],826 u8 default_chain)827{828 int i;829 s32 delta_g;830 struct iwl_chain_noise_data *data = &priv->chain_noise_data;831 832 /*833 * Find Gain Code for the chains based on "default chain"834 */835 for (i = default_chain + 1; i < NUM_RX_CHAINS; i++) {836 if ((data->disconn_array[i])) {837 data->delta_gain_code[i] = 0;838 continue;839 }840 841 delta_g = (priv->lib->chain_noise_scale *842 ((s32)average_noise[default_chain] -843 (s32)average_noise[i])) / 1500;844 845 /* bound gain by 2 bits value max, 3rd bit is sign */846 data->delta_gain_code[i] =847 min(abs(delta_g), CHAIN_NOISE_MAX_DELTA_GAIN_CODE);848 849 if (delta_g < 0)850 /*851 * set negative sign ...852 * note to Intel developers: This is uCode API format,853 * not the format of any internal device registers.854 * Do not change this format for e.g. 6050 or similar855 * devices. Change format only if more resolution856 * (i.e. more than 2 bits magnitude) is needed.857 */858 data->delta_gain_code[i] |= (1 << 2);859 }860 861 IWL_DEBUG_CALIB(priv, "Delta gains: ANT_B = %d ANT_C = %d\n",862 data->delta_gain_code[1], data->delta_gain_code[2]);863 864 if (!data->radio_write) {865 struct iwl_calib_chain_noise_gain_cmd cmd;866 867 memset(&cmd, 0, sizeof(cmd));868 869 iwl_set_calib_hdr(&cmd.hdr,870 priv->phy_calib_chain_noise_gain_cmd);871 cmd.delta_gain_1 = data->delta_gain_code[1];872 cmd.delta_gain_2 = data->delta_gain_code[2];873 iwl_dvm_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,874 CMD_ASYNC, sizeof(cmd), &cmd);875 876 data->radio_write = 1;877 data->state = IWL_CHAIN_NOISE_CALIBRATED;878 }879}880 881/*882 * Accumulate 16 beacons of signal and noise statistics for each of883 * 3 receivers/antennas/rx-chains, then figure out:884 * 1) Which antennas are connected.885 * 2) Differential rx gain settings to balance the 3 receivers.886 */887void iwl_chain_noise_calibration(struct iwl_priv *priv)888{889 struct iwl_chain_noise_data *data = NULL;890 891 u32 chain_noise_a;892 u32 chain_noise_b;893 u32 chain_noise_c;894 u32 chain_sig_a;895 u32 chain_sig_b;896 u32 chain_sig_c;897 u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};898 u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};899 u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;900 u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;901 u16 i = 0;902 u16 rxon_chnum = INITIALIZATION_VALUE;903 u16 stat_chnum = INITIALIZATION_VALUE;904 u8 rxon_band24;905 u8 stat_band24;906 struct statistics_rx_non_phy *rx_info;907 908 /*909 * MULTI-FIXME:910 * When we support multiple interfaces on different channels,911 * this must be modified/fixed.912 */913 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];914 915 if (priv->calib_disabled & IWL_CHAIN_NOISE_CALIB_DISABLED)916 return;917 918 data = &(priv->chain_noise_data);919 920 /*921 * Accumulate just the first "chain_noise_num_beacons" after922 * the first association, then we're done forever.923 */924 if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {925 if (data->state == IWL_CHAIN_NOISE_ALIVE)926 IWL_DEBUG_CALIB(priv, "Wait for noise calib reset\n");927 return;928 }929 930 spin_lock_bh(&priv->statistics.lock);931 932 rx_info = &priv->statistics.rx_non_phy;933 934 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {935 IWL_DEBUG_CALIB(priv, " << Interference data unavailable\n");936 spin_unlock_bh(&priv->statistics.lock);937 return;938 }939 940 rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);941 rxon_chnum = le16_to_cpu(ctx->staging.channel);942 stat_band24 =943 !!(priv->statistics.flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);944 stat_chnum = le32_to_cpu(priv->statistics.flag) >> 16;945 946 /* Make sure we accumulate data for just the associated channel947 * (even if scanning). */948 if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {949 IWL_DEBUG_CALIB(priv, "Stats not from chan=%d, band24=%d\n",950 rxon_chnum, rxon_band24);951 spin_unlock_bh(&priv->statistics.lock);952 return;953 }954 955 /*956 * Accumulate beacon statistics values across957 * "chain_noise_num_beacons"958 */959 chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &960 IN_BAND_FILTER;961 chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &962 IN_BAND_FILTER;963 chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &964 IN_BAND_FILTER;965 966 chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;967 chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;968 chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;969 970 spin_unlock_bh(&priv->statistics.lock);971 972 data->beacon_count++;973 974 data->chain_noise_a = (chain_noise_a + data->chain_noise_a);975 data->chain_noise_b = (chain_noise_b + data->chain_noise_b);976 data->chain_noise_c = (chain_noise_c + data->chain_noise_c);977 978 data->chain_signal_a = (chain_sig_a + data->chain_signal_a);979 data->chain_signal_b = (chain_sig_b + data->chain_signal_b);980 data->chain_signal_c = (chain_sig_c + data->chain_signal_c);981 982 IWL_DEBUG_CALIB(priv, "chan=%d, band24=%d, beacon=%d\n",983 rxon_chnum, rxon_band24, data->beacon_count);984 IWL_DEBUG_CALIB(priv, "chain_sig: a %d b %d c %d\n",985 chain_sig_a, chain_sig_b, chain_sig_c);986 IWL_DEBUG_CALIB(priv, "chain_noise: a %d b %d c %d\n",987 chain_noise_a, chain_noise_b, chain_noise_c);988 989 /* If this is the "chain_noise_num_beacons", determine:990 * 1) Disconnected antennas (using signal strengths)991 * 2) Differential gain (using silence noise) to balance receivers */992 if (data->beacon_count != IWL_CAL_NUM_BEACONS)993 return;994 995 /* Analyze signal for disconnected antenna */996 if (priv->lib->bt_params &&997 priv->lib->bt_params->advanced_bt_coexist) {998 /* Disable disconnected antenna algorithm for advanced999 bt coex, assuming valid antennas are connected */1000 data->active_chains = priv->nvm_data->valid_rx_ant;1001 for (i = 0; i < NUM_RX_CHAINS; i++)1002 if (!(data->active_chains & (1<<i)))1003 data->disconn_array[i] = 1;1004 } else1005 iwl_find_disconn_antenna(priv, average_sig, data);1006 1007 /* Analyze noise for rx balance */1008 average_noise[0] = data->chain_noise_a / IWL_CAL_NUM_BEACONS;1009 average_noise[1] = data->chain_noise_b / IWL_CAL_NUM_BEACONS;1010 average_noise[2] = data->chain_noise_c / IWL_CAL_NUM_BEACONS;1011 1012 for (i = 0; i < NUM_RX_CHAINS; i++) {1013 if (!(data->disconn_array[i]) &&1014 (average_noise[i] <= min_average_noise)) {1015 /* This means that chain i is active and has1016 * lower noise values so far: */1017 min_average_noise = average_noise[i];1018 min_average_noise_antenna_i = i;1019 }1020 }1021 1022 IWL_DEBUG_CALIB(priv, "average_noise: a %d b %d c %d\n",1023 average_noise[0], average_noise[1],1024 average_noise[2]);1025 1026 IWL_DEBUG_CALIB(priv, "min_average_noise = %d, antenna %d\n",1027 min_average_noise, min_average_noise_antenna_i);1028 1029 iwlagn_gain_computation(1030 priv, average_noise,1031 find_first_chain(priv->nvm_data->valid_rx_ant));1032 1033 /* Some power changes may have been made during the calibration.1034 * Update and commit the RXON1035 */1036 iwl_update_chain_flags(priv);1037 1038 data->state = IWL_CHAIN_NOISE_DONE;1039 iwl_power_update_mode(priv, false);1040}1041 1042void iwl_reset_run_time_calib(struct iwl_priv *priv)1043{1044 int i;1045 memset(&(priv->sensitivity_data), 0,1046 sizeof(struct iwl_sensitivity_data));1047 memset(&(priv->chain_noise_data), 0,1048 sizeof(struct iwl_chain_noise_data));1049 for (i = 0; i < NUM_RX_CHAINS; i++)1050 priv->chain_noise_data.delta_gain_code[i] =1051 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;1052 1053 /* Ask for statistics now, the uCode will send notification1054 * periodically after association */1055 iwl_send_statistics_request(priv, CMD_ASYNC, true);1056}1057