1 /******************************************************************************
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.
8 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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.
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15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
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21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
24 * The full GNU General Public License is included in this distribution
25 * in the file called LICENSE.GPL.
27 * Contact Information:
28 * Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
33 * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
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60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 *****************************************************************************/
63 #include <linux/slab.h>
64 #include <net/mac80211.h>
70 /*****************************************************************************
71 * INIT calibrations framework
72 *****************************************************************************/
74 struct stats_general_data {
75 u32 beacon_silence_rssi_a;
76 u32 beacon_silence_rssi_b;
77 u32 beacon_silence_rssi_c;
83 void il4965_calib_free_results(struct il_priv *il)
87 for (i = 0; i < IL_CALIB_MAX; i++) {
88 kfree(il->calib_results[i].buf);
89 il->calib_results[i].buf = NULL;
90 il->calib_results[i].buf_len = 0;
94 /*****************************************************************************
95 * RUNTIME calibrations framework
96 *****************************************************************************/
98 /* "false alarms" are signals that our DSP tries to lock onto,
99 * but then determines that they are either noise, or transmissions
100 * from a distant wireless network (also "noise", really) that get
101 * "stepped on" by stronger transmissions within our own network.
102 * This algorithm attempts to set a sensitivity level that is high
103 * enough to receive all of our own network traffic, but not so
104 * high that our DSP gets too busy trying to lock onto non-network
106 static int il4965_sens_energy_cck(struct il_priv *il,
109 struct stats_general_data *rx_info)
113 u8 max_silence_rssi = 0;
115 u8 silence_rssi_a = 0;
116 u8 silence_rssi_b = 0;
117 u8 silence_rssi_c = 0;
120 /* "false_alarms" values below are cross-multiplications to assess the
121 * numbers of false alarms within the measured period of actual Rx
122 * (Rx is off when we're txing), vs the min/max expected false alarms
123 * (some should be expected if rx is sensitive enough) in a
124 * hypothetical listening period of 200 time units (TU), 204.8 msec:
126 * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
129 u32 false_alarms = norm_fa * 200 * 1024;
130 u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
131 u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
132 struct il_sensitivity_data *data = NULL;
133 const struct il_sensitivity_ranges *ranges = il->hw_params.sens;
135 data = &(il->sensitivity_data);
137 data->nrg_auto_corr_silence_diff = 0;
139 /* Find max silence rssi among all 3 receivers.
140 * This is background noise, which may include transmissions from other
141 * networks, measured during silence before our network's beacon */
142 silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
143 ALL_BAND_FILTER) >> 8);
144 silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
145 ALL_BAND_FILTER) >> 8);
146 silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
147 ALL_BAND_FILTER) >> 8);
149 val = max(silence_rssi_b, silence_rssi_c);
150 max_silence_rssi = max(silence_rssi_a, (u8) val);
152 /* Store silence rssi in 20-beacon history table */
153 data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
154 data->nrg_silence_idx++;
155 if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
156 data->nrg_silence_idx = 0;
158 /* Find max silence rssi across 20 beacon history */
159 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
160 val = data->nrg_silence_rssi[i];
161 silence_ref = max(silence_ref, val);
163 D_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n",
164 silence_rssi_a, silence_rssi_b, silence_rssi_c,
167 /* Find max rx energy (min value!) among all 3 receivers,
168 * measured during beacon frame.
169 * Save it in 10-beacon history table. */
170 i = data->nrg_energy_idx;
171 val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
172 data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
174 data->nrg_energy_idx++;
175 if (data->nrg_energy_idx >= 10)
176 data->nrg_energy_idx = 0;
178 /* Find min rx energy (max value) across 10 beacon history.
179 * This is the minimum signal level that we want to receive well.
180 * Add backoff (margin so we don't miss slightly lower energy frames).
181 * This establishes an upper bound (min value) for energy threshold. */
182 max_nrg_cck = data->nrg_value[0];
183 for (i = 1; i < 10; i++)
184 max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
187 D_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
188 rx_info->beacon_energy_a, rx_info->beacon_energy_b,
189 rx_info->beacon_energy_c, max_nrg_cck - 6);
191 /* Count number of consecutive beacons with fewer-than-desired
193 if (false_alarms < min_false_alarms)
194 data->num_in_cck_no_fa++;
196 data->num_in_cck_no_fa = 0;
197 D_CALIB("consecutive bcns with few false alarms = %u\n",
198 data->num_in_cck_no_fa);
200 /* If we got too many false alarms this time, reduce sensitivity */
201 if (false_alarms > max_false_alarms &&
202 data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK) {
203 D_CALIB("norm FA %u > max FA %u\n",
204 false_alarms, max_false_alarms);
205 D_CALIB("... reducing sensitivity\n");
206 data->nrg_curr_state = IL_FA_TOO_MANY;
207 /* Store for "fewer than desired" on later beacon */
208 data->nrg_silence_ref = silence_ref;
210 /* increase energy threshold (reduce nrg value)
211 * to decrease sensitivity */
212 data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK;
213 /* Else if we got fewer than desired, increase sensitivity */
214 } else if (false_alarms < min_false_alarms) {
215 data->nrg_curr_state = IL_FA_TOO_FEW;
217 /* Compare silence level with silence level for most recent
218 * healthy number or too many false alarms */
219 data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
223 "norm FA %u < min FA %u, silence diff %d\n",
224 false_alarms, min_false_alarms,
225 data->nrg_auto_corr_silence_diff);
227 /* Increase value to increase sensitivity, but only if:
228 * 1a) previous beacon did *not* have *too many* false alarms
229 * 1b) AND there's a significant difference in Rx levels
230 * from a previous beacon with too many, or healthy # FAs
231 * OR 2) We've seen a lot of beacons (100) with too few
233 if (data->nrg_prev_state != IL_FA_TOO_MANY &&
234 (data->nrg_auto_corr_silence_diff > NRG_DIFF ||
235 data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA)) {
237 D_CALIB("... increasing sensitivity\n");
238 /* Increase nrg value to increase sensitivity */
239 val = data->nrg_th_cck + NRG_STEP_CCK;
240 data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
243 "... but not changing sensitivity\n");
246 /* Else we got a healthy number of false alarms, keep status quo */
248 D_CALIB(" FA in safe zone\n");
249 data->nrg_curr_state = IL_FA_GOOD_RANGE;
251 /* Store for use in "fewer than desired" with later beacon */
252 data->nrg_silence_ref = silence_ref;
254 /* If previous beacon had too many false alarms,
255 * give it some extra margin by reducing sensitivity again
256 * (but don't go below measured energy of desired Rx) */
257 if (IL_FA_TOO_MANY == data->nrg_prev_state) {
258 D_CALIB("... increasing margin\n");
259 if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
260 data->nrg_th_cck -= NRG_MARGIN;
262 data->nrg_th_cck = max_nrg_cck;
266 /* Make sure the energy threshold does not go above the measured
267 * energy of the desired Rx signals (reduced by backoff margin),
268 * or else we might start missing Rx frames.
269 * Lower value is higher energy, so we use max()!
271 data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
272 D_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck);
274 data->nrg_prev_state = data->nrg_curr_state;
276 /* Auto-correlation CCK algorithm */
277 if (false_alarms > min_false_alarms) {
279 /* increase auto_corr values to decrease sensitivity
280 * so the DSP won't be disturbed by the noise
282 if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
283 data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
285 val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
286 data->auto_corr_cck =
287 min((u32)ranges->auto_corr_max_cck, val);
289 val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
290 data->auto_corr_cck_mrc =
291 min((u32)ranges->auto_corr_max_cck_mrc, val);
292 } else if (false_alarms < min_false_alarms &&
293 (data->nrg_auto_corr_silence_diff > NRG_DIFF ||
294 data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA)) {
296 /* Decrease auto_corr values to increase sensitivity */
297 val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
298 data->auto_corr_cck =
299 max((u32)ranges->auto_corr_min_cck, val);
300 val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
301 data->auto_corr_cck_mrc =
302 max((u32)ranges->auto_corr_min_cck_mrc, val);
309 static int il4965_sens_auto_corr_ofdm(struct il_priv *il,
314 u32 false_alarms = norm_fa * 200 * 1024;
315 u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
316 u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
317 struct il_sensitivity_data *data = NULL;
318 const struct il_sensitivity_ranges *ranges = il->hw_params.sens;
320 data = &(il->sensitivity_data);
322 /* If we got too many false alarms this time, reduce sensitivity */
323 if (false_alarms > max_false_alarms) {
325 D_CALIB("norm FA %u > max FA %u)\n",
326 false_alarms, max_false_alarms);
328 val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
329 data->auto_corr_ofdm =
330 min((u32)ranges->auto_corr_max_ofdm, val);
332 val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
333 data->auto_corr_ofdm_mrc =
334 min((u32)ranges->auto_corr_max_ofdm_mrc, val);
336 val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
337 data->auto_corr_ofdm_x1 =
338 min((u32)ranges->auto_corr_max_ofdm_x1, val);
340 val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
341 data->auto_corr_ofdm_mrc_x1 =
342 min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
345 /* Else if we got fewer than desired, increase sensitivity */
346 else if (false_alarms < min_false_alarms) {
348 D_CALIB("norm FA %u < min FA %u\n",
349 false_alarms, min_false_alarms);
351 val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
352 data->auto_corr_ofdm =
353 max((u32)ranges->auto_corr_min_ofdm, val);
355 val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
356 data->auto_corr_ofdm_mrc =
357 max((u32)ranges->auto_corr_min_ofdm_mrc, val);
359 val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
360 data->auto_corr_ofdm_x1 =
361 max((u32)ranges->auto_corr_min_ofdm_x1, val);
363 val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
364 data->auto_corr_ofdm_mrc_x1 =
365 max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
367 D_CALIB("min FA %u < norm FA %u < max FA %u OK\n",
368 min_false_alarms, false_alarms, max_false_alarms);
373 static void il4965_prepare_legacy_sensitivity_tbl(struct il_priv *il,
374 struct il_sensitivity_data *data,
377 tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_IDX] =
378 cpu_to_le16((u16)data->auto_corr_ofdm);
379 tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_IDX] =
380 cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
381 tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_IDX] =
382 cpu_to_le16((u16)data->auto_corr_ofdm_x1);
383 tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_IDX] =
384 cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
386 tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_IDX] =
387 cpu_to_le16((u16)data->auto_corr_cck);
388 tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_IDX] =
389 cpu_to_le16((u16)data->auto_corr_cck_mrc);
391 tbl[HD_MIN_ENERGY_CCK_DET_IDX] =
392 cpu_to_le16((u16)data->nrg_th_cck);
393 tbl[HD_MIN_ENERGY_OFDM_DET_IDX] =
394 cpu_to_le16((u16)data->nrg_th_ofdm);
396 tbl[HD_BARKER_CORR_TH_ADD_MIN_IDX] =
397 cpu_to_le16(data->barker_corr_th_min);
398 tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_IDX] =
399 cpu_to_le16(data->barker_corr_th_min_mrc);
400 tbl[HD_OFDM_ENERGY_TH_IN_IDX] =
401 cpu_to_le16(data->nrg_th_cca);
403 D_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
404 data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
405 data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
408 D_CALIB("cck: ac %u mrc %u thresh %u\n",
409 data->auto_corr_cck, data->auto_corr_cck_mrc,
413 /* Prepare a C_SENSITIVITY, send to uCode if values have changed */
414 static int il4965_sensitivity_write(struct il_priv *il)
416 struct il_sensitivity_cmd cmd;
417 struct il_sensitivity_data *data = NULL;
418 struct il_host_cmd cmd_out = {
420 .len = sizeof(struct il_sensitivity_cmd),
425 data = &(il->sensitivity_data);
427 memset(&cmd, 0, sizeof(cmd));
429 il4965_prepare_legacy_sensitivity_tbl(il, data, &cmd.table[0]);
431 /* Update uCode's "work" table, and copy it to DSP */
432 cmd.control = C_SENSITIVITY_CONTROL_WORK_TBL;
434 /* Don't send command to uCode if nothing has changed */
435 if (!memcmp(&cmd.table[0], &(il->sensitivity_tbl[0]),
436 sizeof(u16)*HD_TBL_SIZE)) {
437 D_CALIB("No change in C_SENSITIVITY\n");
441 /* Copy table for comparison next time */
442 memcpy(&(il->sensitivity_tbl[0]), &(cmd.table[0]),
443 sizeof(u16)*HD_TBL_SIZE);
445 return il_send_cmd(il, &cmd_out);
448 void il4965_init_sensitivity(struct il_priv *il)
452 struct il_sensitivity_data *data = NULL;
453 const struct il_sensitivity_ranges *ranges = il->hw_params.sens;
455 if (il->disable_sens_cal)
458 D_CALIB("Start il4965_init_sensitivity\n");
460 /* Clear driver's sensitivity algo data */
461 data = &(il->sensitivity_data);
466 memset(data, 0, sizeof(struct il_sensitivity_data));
468 data->num_in_cck_no_fa = 0;
469 data->nrg_curr_state = IL_FA_TOO_MANY;
470 data->nrg_prev_state = IL_FA_TOO_MANY;
471 data->nrg_silence_ref = 0;
472 data->nrg_silence_idx = 0;
473 data->nrg_energy_idx = 0;
475 for (i = 0; i < 10; i++)
476 data->nrg_value[i] = 0;
478 for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
479 data->nrg_silence_rssi[i] = 0;
481 data->auto_corr_ofdm = ranges->auto_corr_min_ofdm;
482 data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
483 data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1;
484 data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
485 data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
486 data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
487 data->nrg_th_cck = ranges->nrg_th_cck;
488 data->nrg_th_ofdm = ranges->nrg_th_ofdm;
489 data->barker_corr_th_min = ranges->barker_corr_th_min;
490 data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc;
491 data->nrg_th_cca = ranges->nrg_th_cca;
493 data->last_bad_plcp_cnt_ofdm = 0;
494 data->last_fa_cnt_ofdm = 0;
495 data->last_bad_plcp_cnt_cck = 0;
496 data->last_fa_cnt_cck = 0;
498 ret |= il4965_sensitivity_write(il);
499 D_CALIB("<<return 0x%X\n", ret);
502 void il4965_sensitivity_calibration(struct il_priv *il, void *resp)
511 struct il_sensitivity_data *data = NULL;
512 struct stats_rx_non_phy *rx_info;
513 struct stats_rx_phy *ofdm, *cck;
515 struct stats_general_data statis;
517 if (il->disable_sens_cal)
520 data = &(il->sensitivity_data);
522 if (!il_is_any_associated(il)) {
523 D_CALIB("<< - not associated\n");
527 spin_lock_irqsave(&il->lock, flags);
529 rx_info = &(((struct il_notif_stats *)resp)->rx.general);
530 ofdm = &(((struct il_notif_stats *)resp)->rx.ofdm);
531 cck = &(((struct il_notif_stats *)resp)->rx.cck);
533 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
534 D_CALIB("<< invalid data.\n");
535 spin_unlock_irqrestore(&il->lock, flags);
539 /* Extract Statistics: */
540 rx_enable_time = le32_to_cpu(rx_info->channel_load);
541 fa_cck = le32_to_cpu(cck->false_alarm_cnt);
542 fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt);
543 bad_plcp_cck = le32_to_cpu(cck->plcp_err);
544 bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err);
546 statis.beacon_silence_rssi_a =
547 le32_to_cpu(rx_info->beacon_silence_rssi_a);
548 statis.beacon_silence_rssi_b =
549 le32_to_cpu(rx_info->beacon_silence_rssi_b);
550 statis.beacon_silence_rssi_c =
551 le32_to_cpu(rx_info->beacon_silence_rssi_c);
552 statis.beacon_energy_a =
553 le32_to_cpu(rx_info->beacon_energy_a);
554 statis.beacon_energy_b =
555 le32_to_cpu(rx_info->beacon_energy_b);
556 statis.beacon_energy_c =
557 le32_to_cpu(rx_info->beacon_energy_c);
559 spin_unlock_irqrestore(&il->lock, flags);
561 D_CALIB("rx_enable_time = %u usecs\n", rx_enable_time);
563 if (!rx_enable_time) {
564 D_CALIB("<< RX Enable Time == 0!\n");
568 /* These stats increase monotonically, and do not reset
569 * at each beacon. Calculate difference from last value, or just
570 * use the new stats value if it has reset or wrapped around. */
571 if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
572 data->last_bad_plcp_cnt_cck = bad_plcp_cck;
574 bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
575 data->last_bad_plcp_cnt_cck += bad_plcp_cck;
578 if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
579 data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
581 bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
582 data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
585 if (data->last_fa_cnt_ofdm > fa_ofdm)
586 data->last_fa_cnt_ofdm = fa_ofdm;
588 fa_ofdm -= data->last_fa_cnt_ofdm;
589 data->last_fa_cnt_ofdm += fa_ofdm;
592 if (data->last_fa_cnt_cck > fa_cck)
593 data->last_fa_cnt_cck = fa_cck;
595 fa_cck -= data->last_fa_cnt_cck;
596 data->last_fa_cnt_cck += fa_cck;
599 /* Total aborted signal locks */
600 norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
601 norm_fa_cck = fa_cck + bad_plcp_cck;
604 "cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck,
605 bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
607 il4965_sens_auto_corr_ofdm(il, norm_fa_ofdm, rx_enable_time);
608 il4965_sens_energy_cck(il, norm_fa_cck, rx_enable_time, &statis);
610 il4965_sensitivity_write(il);
613 static inline u8 il4965_find_first_chain(u8 mask)
623 * Run disconnected antenna algorithm to find out which antennas are
627 il4965_find_disconn_antenna(struct il_priv *il, u32* average_sig,
628 struct il_chain_noise_data *data)
630 u32 active_chains = 0;
632 u16 max_average_sig_antenna_i;
637 average_sig[0] = data->chain_signal_a /
638 il->cfg->base_params->chain_noise_num_beacons;
639 average_sig[1] = data->chain_signal_b /
640 il->cfg->base_params->chain_noise_num_beacons;
641 average_sig[2] = data->chain_signal_c /
642 il->cfg->base_params->chain_noise_num_beacons;
644 if (average_sig[0] >= average_sig[1]) {
645 max_average_sig = average_sig[0];
646 max_average_sig_antenna_i = 0;
647 active_chains = (1 << max_average_sig_antenna_i);
649 max_average_sig = average_sig[1];
650 max_average_sig_antenna_i = 1;
651 active_chains = (1 << max_average_sig_antenna_i);
654 if (average_sig[2] >= max_average_sig) {
655 max_average_sig = average_sig[2];
656 max_average_sig_antenna_i = 2;
657 active_chains = (1 << max_average_sig_antenna_i);
660 D_CALIB("average_sig: a %d b %d c %d\n",
661 average_sig[0], average_sig[1], average_sig[2]);
662 D_CALIB("max_average_sig = %d, antenna %d\n",
663 max_average_sig, max_average_sig_antenna_i);
665 /* Compare signal strengths for all 3 receivers. */
666 for (i = 0; i < NUM_RX_CHAINS; i++) {
667 if (i != max_average_sig_antenna_i) {
668 s32 rssi_delta = (max_average_sig - average_sig[i]);
670 /* If signal is very weak, compared with
671 * strongest, mark it as disconnected. */
672 if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
673 data->disconn_array[i] = 1;
675 active_chains |= (1 << i);
676 D_CALIB("i = %d rssiDelta = %d "
677 "disconn_array[i] = %d\n",
678 i, rssi_delta, data->disconn_array[i]);
683 * The above algorithm sometimes fails when the ucode
684 * reports 0 for all chains. It's not clear why that
685 * happens to start with, but it is then causing trouble
686 * because this can make us enable more chains than the
687 * hardware really has.
689 * To be safe, simply mask out any chains that we know
690 * are not on the device.
692 active_chains &= il->hw_params.valid_rx_ant;
695 for (i = 0; i < NUM_RX_CHAINS; i++) {
696 /* loops on all the bits of
697 * il->hw_setting.valid_tx_ant */
698 u8 ant_msk = (1 << i);
699 if (!(il->hw_params.valid_tx_ant & ant_msk))
703 if (data->disconn_array[i] == 0)
704 /* there is a Tx antenna connected */
706 if (num_tx_chains == il->hw_params.tx_chains_num &&
707 data->disconn_array[i]) {
709 * If all chains are disconnected
710 * connect the first valid tx chain
713 il4965_find_first_chain(il->cfg->valid_tx_ant);
714 data->disconn_array[first_chain] = 0;
715 active_chains |= BIT(first_chain);
717 "All Tx chains are disconnected W/A - declare %d as connected\n",
723 if (active_chains != il->hw_params.valid_rx_ant &&
724 active_chains != il->chain_noise_data.active_chains)
726 "Detected that not all antennas are connected! "
727 "Connected: %#x, valid: %#x.\n",
728 active_chains, il->hw_params.valid_rx_ant);
730 /* Save for use within RXON, TX, SCAN commands, etc. */
731 data->active_chains = active_chains;
732 D_CALIB("active_chains (bitwise) = 0x%x\n",
736 static void il4965_gain_computation(struct il_priv *il,
738 u16 min_average_noise_antenna_i,
739 u32 min_average_noise,
743 struct il_chain_noise_data *data = &il->chain_noise_data;
745 data->delta_gain_code[min_average_noise_antenna_i] = 0;
747 for (i = default_chain; i < NUM_RX_CHAINS; i++) {
750 if (!data->disconn_array[i] &&
751 data->delta_gain_code[i] == CHAIN_NOISE_DELTA_GAIN_INIT_VAL) {
752 delta_g = average_noise[i] - min_average_noise;
753 data->delta_gain_code[i] = (u8)((delta_g * 10) / 15);
754 data->delta_gain_code[i] =
755 min(data->delta_gain_code[i],
756 (u8) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
758 data->delta_gain_code[i] =
759 (data->delta_gain_code[i] | (1 << 2));
761 data->delta_gain_code[i] = 0;
764 D_CALIB("delta_gain_codes: a %d b %d c %d\n",
765 data->delta_gain_code[0],
766 data->delta_gain_code[1],
767 data->delta_gain_code[2]);
769 /* Differential gain gets sent to uCode only once */
770 if (!data->radio_write) {
771 struct il_calib_diff_gain_cmd cmd;
772 data->radio_write = 1;
774 memset(&cmd, 0, sizeof(cmd));
775 cmd.hdr.op_code = IL_PHY_CALIBRATE_DIFF_GAIN_CMD;
776 cmd.diff_gain_a = data->delta_gain_code[0];
777 cmd.diff_gain_b = data->delta_gain_code[1];
778 cmd.diff_gain_c = data->delta_gain_code[2];
779 ret = il_send_cmd_pdu(il, C_PHY_CALIBRATION,
782 D_CALIB("fail sending cmd "
783 "C_PHY_CALIBRATION\n");
785 /* TODO we might want recalculate
786 * rx_chain in rxon cmd */
788 /* Mark so we run this algo only once! */
789 data->state = IL_CHAIN_NOISE_CALIBRATED;
796 * Accumulate 16 beacons of signal and noise stats for each of
797 * 3 receivers/antennas/rx-chains, then figure out:
798 * 1) Which antennas are connected.
799 * 2) Differential rx gain settings to balance the 3 receivers.
801 void il4965_chain_noise_calibration(struct il_priv *il, void *stat_resp)
803 struct il_chain_noise_data *data = NULL;
811 u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
812 u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
813 u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
814 u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
816 u16 rxon_chnum = INITIALIZATION_VALUE;
817 u16 stat_chnum = INITIALIZATION_VALUE;
821 struct stats_rx_non_phy *rx_info;
823 struct il_rxon_context *ctx = &il->ctx;
825 if (il->disable_chain_noise_cal)
828 data = &(il->chain_noise_data);
831 * Accumulate just the first "chain_noise_num_beacons" after
832 * the first association, then we're done forever.
834 if (data->state != IL_CHAIN_NOISE_ACCUMULATE) {
835 if (data->state == IL_CHAIN_NOISE_ALIVE)
836 D_CALIB("Wait for noise calib reset\n");
840 spin_lock_irqsave(&il->lock, flags);
842 rx_info = &(((struct il_notif_stats *)stat_resp)->
845 if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
846 D_CALIB(" << Interference data unavailable\n");
847 spin_unlock_irqrestore(&il->lock, flags);
851 rxon_band24 = !!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK);
852 rxon_chnum = le16_to_cpu(ctx->staging.channel);
854 stat_band24 = !!(((struct il_notif_stats *)
856 STATS_REPLY_FLG_BAND_24G_MSK);
857 stat_chnum = le32_to_cpu(((struct il_notif_stats *)
858 stat_resp)->flag) >> 16;
860 /* Make sure we accumulate data for just the associated channel
861 * (even if scanning). */
862 if (rxon_chnum != stat_chnum || rxon_band24 != stat_band24) {
863 D_CALIB("Stats not from chan=%d, band24=%d\n",
864 rxon_chnum, rxon_band24);
865 spin_unlock_irqrestore(&il->lock, flags);
870 * Accumulate beacon stats values across
871 * "chain_noise_num_beacons"
873 chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
875 chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
877 chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
880 chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
881 chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
882 chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
884 spin_unlock_irqrestore(&il->lock, flags);
886 data->beacon_count++;
888 data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
889 data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
890 data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
892 data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
893 data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
894 data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
896 D_CALIB("chan=%d, band24=%d, beacon=%d\n",
897 rxon_chnum, rxon_band24, data->beacon_count);
898 D_CALIB("chain_sig: a %d b %d c %d\n",
899 chain_sig_a, chain_sig_b, chain_sig_c);
900 D_CALIB("chain_noise: a %d b %d c %d\n",
901 chain_noise_a, chain_noise_b, chain_noise_c);
903 /* If this is the "chain_noise_num_beacons", determine:
904 * 1) Disconnected antennas (using signal strengths)
905 * 2) Differential gain (using silence noise) to balance receivers */
906 if (data->beacon_count !=
907 il->cfg->base_params->chain_noise_num_beacons)
910 /* Analyze signal for disconnected antenna */
911 il4965_find_disconn_antenna(il, average_sig, data);
913 /* Analyze noise for rx balance */
914 average_noise[0] = data->chain_noise_a /
915 il->cfg->base_params->chain_noise_num_beacons;
916 average_noise[1] = data->chain_noise_b /
917 il->cfg->base_params->chain_noise_num_beacons;
918 average_noise[2] = data->chain_noise_c /
919 il->cfg->base_params->chain_noise_num_beacons;
921 for (i = 0; i < NUM_RX_CHAINS; i++) {
922 if (!data->disconn_array[i] &&
923 average_noise[i] <= min_average_noise) {
924 /* This means that chain i is active and has
925 * lower noise values so far: */
926 min_average_noise = average_noise[i];
927 min_average_noise_antenna_i = i;
931 D_CALIB("average_noise: a %d b %d c %d\n",
932 average_noise[0], average_noise[1],
935 D_CALIB("min_average_noise = %d, antenna %d\n",
936 min_average_noise, min_average_noise_antenna_i);
938 il4965_gain_computation(il, average_noise,
939 min_average_noise_antenna_i, min_average_noise,
940 il4965_find_first_chain(il->cfg->valid_rx_ant));
942 /* Some power changes may have been made during the calibration.
943 * Update and commit the RXON
945 if (il->cfg->ops->lib->update_chain_flags)
946 il->cfg->ops->lib->update_chain_flags(il);
948 data->state = IL_CHAIN_NOISE_DONE;
949 il_power_update_mode(il, false);
952 void il4965_reset_run_time_calib(struct il_priv *il)
955 memset(&(il->sensitivity_data), 0,
956 sizeof(struct il_sensitivity_data));
957 memset(&(il->chain_noise_data), 0,
958 sizeof(struct il_chain_noise_data));
959 for (i = 0; i < NUM_RX_CHAINS; i++)
960 il->chain_noise_data.delta_gain_code[i] =
961 CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
963 /* Ask for stats now, the uCode will send notification
964 * periodically after association */
965 il_send_stats_request(il, CMD_ASYNC, true);