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 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.
14 * This program is distributed in the hope that it will be useful, but
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.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
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 * Tomas Winkler <tomas.winkler@intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
33 * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
34 * All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
40 * * Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * * Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
46 * * Neither the name Intel Corporation nor the names of its
47 * contributors may be used to endorse or promote products derived
48 * from this software without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 *****************************************************************************/
63 #include <linux/kernel.h>
64 #include <net/mac80211.h>
68 #include "iwl-calib.h"
69 #include "iwl-eeprom.h"
71 /* "false alarms" are signals that our DSP tries to lock onto,
72 * but then determines that they are either noise, or transmissions
73 * from a distant wireless network (also "noise", really) that get
74 * "stepped on" by stronger transmissions within our own network.
75 * This algorithm attempts to set a sensitivity level that is high
76 * enough to receive all of our own network traffic, but not so
77 * high that our DSP gets too busy trying to lock onto non-network
79 static int iwl_sens_energy_cck(struct iwl_priv
*priv
,
82 struct statistics_general_data
*rx_info
)
86 u8 max_silence_rssi
= 0;
88 u8 silence_rssi_a
= 0;
89 u8 silence_rssi_b
= 0;
90 u8 silence_rssi_c
= 0;
93 /* "false_alarms" values below are cross-multiplications to assess the
94 * numbers of false alarms within the measured period of actual Rx
95 * (Rx is off when we're txing), vs the min/max expected false alarms
96 * (some should be expected if rx is sensitive enough) in a
97 * hypothetical listening period of 200 time units (TU), 204.8 msec:
99 * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
102 u32 false_alarms
= norm_fa
* 200 * 1024;
103 u32 max_false_alarms
= MAX_FA_CCK
* rx_enable_time
;
104 u32 min_false_alarms
= MIN_FA_CCK
* rx_enable_time
;
105 struct iwl_sensitivity_data
*data
= NULL
;
106 const struct iwl_sensitivity_ranges
*ranges
= priv
->hw_params
.sens
;
108 data
= &(priv
->sensitivity_data
);
110 data
->nrg_auto_corr_silence_diff
= 0;
112 /* Find max silence rssi among all 3 receivers.
113 * This is background noise, which may include transmissions from other
114 * networks, measured during silence before our network's beacon */
115 silence_rssi_a
= (u8
)((rx_info
->beacon_silence_rssi_a
&
116 ALL_BAND_FILTER
) >> 8);
117 silence_rssi_b
= (u8
)((rx_info
->beacon_silence_rssi_b
&
118 ALL_BAND_FILTER
) >> 8);
119 silence_rssi_c
= (u8
)((rx_info
->beacon_silence_rssi_c
&
120 ALL_BAND_FILTER
) >> 8);
122 val
= max(silence_rssi_b
, silence_rssi_c
);
123 max_silence_rssi
= max(silence_rssi_a
, (u8
) val
);
125 /* Store silence rssi in 20-beacon history table */
126 data
->nrg_silence_rssi
[data
->nrg_silence_idx
] = max_silence_rssi
;
127 data
->nrg_silence_idx
++;
128 if (data
->nrg_silence_idx
>= NRG_NUM_PREV_STAT_L
)
129 data
->nrg_silence_idx
= 0;
131 /* Find max silence rssi across 20 beacon history */
132 for (i
= 0; i
< NRG_NUM_PREV_STAT_L
; i
++) {
133 val
= data
->nrg_silence_rssi
[i
];
134 silence_ref
= max(silence_ref
, val
);
136 IWL_DEBUG_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n",
137 silence_rssi_a
, silence_rssi_b
, silence_rssi_c
,
140 /* Find max rx energy (min value!) among all 3 receivers,
141 * measured during beacon frame.
142 * Save it in 10-beacon history table. */
143 i
= data
->nrg_energy_idx
;
144 val
= min(rx_info
->beacon_energy_b
, rx_info
->beacon_energy_c
);
145 data
->nrg_value
[i
] = min(rx_info
->beacon_energy_a
, val
);
147 data
->nrg_energy_idx
++;
148 if (data
->nrg_energy_idx
>= 10)
149 data
->nrg_energy_idx
= 0;
151 /* Find min rx energy (max value) across 10 beacon history.
152 * This is the minimum signal level that we want to receive well.
153 * Add backoff (margin so we don't miss slightly lower energy frames).
154 * This establishes an upper bound (min value) for energy threshold. */
155 max_nrg_cck
= data
->nrg_value
[0];
156 for (i
= 1; i
< 10; i
++)
157 max_nrg_cck
= (u32
) max(max_nrg_cck
, (data
->nrg_value
[i
]));
160 IWL_DEBUG_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
161 rx_info
->beacon_energy_a
, rx_info
->beacon_energy_b
,
162 rx_info
->beacon_energy_c
, max_nrg_cck
- 6);
164 /* Count number of consecutive beacons with fewer-than-desired
166 if (false_alarms
< min_false_alarms
)
167 data
->num_in_cck_no_fa
++;
169 data
->num_in_cck_no_fa
= 0;
170 IWL_DEBUG_CALIB("consecutive bcns with few false alarms = %u\n",
171 data
->num_in_cck_no_fa
);
173 /* If we got too many false alarms this time, reduce sensitivity */
174 if ((false_alarms
> max_false_alarms
) &&
175 (data
->auto_corr_cck
> AUTO_CORR_MAX_TH_CCK
)) {
176 IWL_DEBUG_CALIB("norm FA %u > max FA %u\n",
177 false_alarms
, max_false_alarms
);
178 IWL_DEBUG_CALIB("... reducing sensitivity\n");
179 data
->nrg_curr_state
= IWL_FA_TOO_MANY
;
180 /* Store for "fewer than desired" on later beacon */
181 data
->nrg_silence_ref
= silence_ref
;
183 /* increase energy threshold (reduce nrg value)
184 * to decrease sensitivity */
185 if (data
->nrg_th_cck
>
186 (ranges
->max_nrg_cck
+ NRG_STEP_CCK
))
187 data
->nrg_th_cck
= data
->nrg_th_cck
190 data
->nrg_th_cck
= ranges
->max_nrg_cck
;
191 /* Else if we got fewer than desired, increase sensitivity */
192 } else if (false_alarms
< min_false_alarms
) {
193 data
->nrg_curr_state
= IWL_FA_TOO_FEW
;
195 /* Compare silence level with silence level for most recent
196 * healthy number or too many false alarms */
197 data
->nrg_auto_corr_silence_diff
= (s32
)data
->nrg_silence_ref
-
200 IWL_DEBUG_CALIB("norm FA %u < min FA %u, silence diff %d\n",
201 false_alarms
, min_false_alarms
,
202 data
->nrg_auto_corr_silence_diff
);
204 /* Increase value to increase sensitivity, but only if:
205 * 1a) previous beacon did *not* have *too many* false alarms
206 * 1b) AND there's a significant difference in Rx levels
207 * from a previous beacon with too many, or healthy # FAs
208 * OR 2) We've seen a lot of beacons (100) with too few
210 if ((data
->nrg_prev_state
!= IWL_FA_TOO_MANY
) &&
211 ((data
->nrg_auto_corr_silence_diff
> NRG_DIFF
) ||
212 (data
->num_in_cck_no_fa
> MAX_NUMBER_CCK_NO_FA
))) {
214 IWL_DEBUG_CALIB("... increasing sensitivity\n");
215 /* Increase nrg value to increase sensitivity */
216 val
= data
->nrg_th_cck
+ NRG_STEP_CCK
;
217 data
->nrg_th_cck
= min((u32
)ranges
->min_nrg_cck
, val
);
219 IWL_DEBUG_CALIB("... but not changing sensitivity\n");
222 /* Else we got a healthy number of false alarms, keep status quo */
224 IWL_DEBUG_CALIB(" FA in safe zone\n");
225 data
->nrg_curr_state
= IWL_FA_GOOD_RANGE
;
227 /* Store for use in "fewer than desired" with later beacon */
228 data
->nrg_silence_ref
= silence_ref
;
230 /* If previous beacon had too many false alarms,
231 * give it some extra margin by reducing sensitivity again
232 * (but don't go below measured energy of desired Rx) */
233 if (IWL_FA_TOO_MANY
== data
->nrg_prev_state
) {
234 IWL_DEBUG_CALIB("... increasing margin\n");
235 if (data
->nrg_th_cck
> (max_nrg_cck
+ NRG_MARGIN
))
236 data
->nrg_th_cck
-= NRG_MARGIN
;
238 data
->nrg_th_cck
= max_nrg_cck
;
242 /* Make sure the energy threshold does not go above the measured
243 * energy of the desired Rx signals (reduced by backoff margin),
244 * or else we might start missing Rx frames.
245 * Lower value is higher energy, so we use max()!
247 data
->nrg_th_cck
= max(max_nrg_cck
, data
->nrg_th_cck
);
248 IWL_DEBUG_CALIB("new nrg_th_cck %u\n", data
->nrg_th_cck
);
250 data
->nrg_prev_state
= data
->nrg_curr_state
;
252 /* Auto-correlation CCK algorithm */
253 if (false_alarms
> min_false_alarms
) {
255 /* increase auto_corr values to decrease sensitivity
256 * so the DSP won't be disturbed by the noise
258 if (data
->auto_corr_cck
< AUTO_CORR_MAX_TH_CCK
)
259 data
->auto_corr_cck
= AUTO_CORR_MAX_TH_CCK
+ 1;
261 val
= data
->auto_corr_cck
+ AUTO_CORR_STEP_CCK
;
262 data
->auto_corr_cck
=
263 min((u32
)ranges
->auto_corr_max_cck
, val
);
265 val
= data
->auto_corr_cck_mrc
+ AUTO_CORR_STEP_CCK
;
266 data
->auto_corr_cck_mrc
=
267 min((u32
)ranges
->auto_corr_max_cck_mrc
, val
);
268 } else if ((false_alarms
< min_false_alarms
) &&
269 ((data
->nrg_auto_corr_silence_diff
> NRG_DIFF
) ||
270 (data
->num_in_cck_no_fa
> MAX_NUMBER_CCK_NO_FA
))) {
272 /* Decrease auto_corr values to increase sensitivity */
273 val
= data
->auto_corr_cck
- AUTO_CORR_STEP_CCK
;
274 data
->auto_corr_cck
=
275 max((u32
)ranges
->auto_corr_min_cck
, val
);
276 val
= data
->auto_corr_cck_mrc
- AUTO_CORR_STEP_CCK
;
277 data
->auto_corr_cck_mrc
=
278 max((u32
)ranges
->auto_corr_min_cck_mrc
, val
);
285 static int iwl_sens_auto_corr_ofdm(struct iwl_priv
*priv
,
290 u32 false_alarms
= norm_fa
* 200 * 1024;
291 u32 max_false_alarms
= MAX_FA_OFDM
* rx_enable_time
;
292 u32 min_false_alarms
= MIN_FA_OFDM
* rx_enable_time
;
293 struct iwl_sensitivity_data
*data
= NULL
;
294 const struct iwl_sensitivity_ranges
*ranges
= priv
->hw_params
.sens
;
296 data
= &(priv
->sensitivity_data
);
298 /* If we got too many false alarms this time, reduce sensitivity */
299 if (false_alarms
> max_false_alarms
) {
301 IWL_DEBUG_CALIB("norm FA %u > max FA %u)\n",
302 false_alarms
, max_false_alarms
);
304 val
= data
->auto_corr_ofdm
+ AUTO_CORR_STEP_OFDM
;
305 data
->auto_corr_ofdm
=
306 min((u32
)ranges
->auto_corr_max_ofdm
, val
);
308 val
= data
->auto_corr_ofdm_mrc
+ AUTO_CORR_STEP_OFDM
;
309 data
->auto_corr_ofdm_mrc
=
310 min((u32
)ranges
->auto_corr_max_ofdm_mrc
, val
);
312 val
= data
->auto_corr_ofdm_x1
+ AUTO_CORR_STEP_OFDM
;
313 data
->auto_corr_ofdm_x1
=
314 min((u32
)ranges
->auto_corr_max_ofdm_x1
, val
);
316 val
= data
->auto_corr_ofdm_mrc_x1
+ AUTO_CORR_STEP_OFDM
;
317 data
->auto_corr_ofdm_mrc_x1
=
318 min((u32
)ranges
->auto_corr_max_ofdm_mrc_x1
, val
);
321 /* Else if we got fewer than desired, increase sensitivity */
322 else if (false_alarms
< min_false_alarms
) {
324 IWL_DEBUG_CALIB("norm FA %u < min FA %u\n",
325 false_alarms
, min_false_alarms
);
327 val
= data
->auto_corr_ofdm
- AUTO_CORR_STEP_OFDM
;
328 data
->auto_corr_ofdm
=
329 max((u32
)ranges
->auto_corr_min_ofdm
, val
);
331 val
= data
->auto_corr_ofdm_mrc
- AUTO_CORR_STEP_OFDM
;
332 data
->auto_corr_ofdm_mrc
=
333 max((u32
)ranges
->auto_corr_min_ofdm_mrc
, val
);
335 val
= data
->auto_corr_ofdm_x1
- AUTO_CORR_STEP_OFDM
;
336 data
->auto_corr_ofdm_x1
=
337 max((u32
)ranges
->auto_corr_min_ofdm_x1
, val
);
339 val
= data
->auto_corr_ofdm_mrc_x1
- AUTO_CORR_STEP_OFDM
;
340 data
->auto_corr_ofdm_mrc_x1
=
341 max((u32
)ranges
->auto_corr_min_ofdm_mrc_x1
, val
);
343 IWL_DEBUG_CALIB("min FA %u < norm FA %u < max FA %u OK\n",
344 min_false_alarms
, false_alarms
, max_false_alarms
);
349 /* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
350 static int iwl_sensitivity_write(struct iwl_priv
*priv
)
353 struct iwl_sensitivity_cmd cmd
;
354 struct iwl_sensitivity_data
*data
= NULL
;
355 struct iwl_host_cmd cmd_out
= {
356 .id
= SENSITIVITY_CMD
,
357 .len
= sizeof(struct iwl_sensitivity_cmd
),
358 .meta
.flags
= CMD_ASYNC
,
362 data
= &(priv
->sensitivity_data
);
364 memset(&cmd
, 0, sizeof(cmd
));
366 cmd
.table
[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX
] =
367 cpu_to_le16((u16
)data
->auto_corr_ofdm
);
368 cmd
.table
[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX
] =
369 cpu_to_le16((u16
)data
->auto_corr_ofdm_mrc
);
370 cmd
.table
[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX
] =
371 cpu_to_le16((u16
)data
->auto_corr_ofdm_x1
);
372 cmd
.table
[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX
] =
373 cpu_to_le16((u16
)data
->auto_corr_ofdm_mrc_x1
);
375 cmd
.table
[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX
] =
376 cpu_to_le16((u16
)data
->auto_corr_cck
);
377 cmd
.table
[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX
] =
378 cpu_to_le16((u16
)data
->auto_corr_cck_mrc
);
380 cmd
.table
[HD_MIN_ENERGY_CCK_DET_INDEX
] =
381 cpu_to_le16((u16
)data
->nrg_th_cck
);
382 cmd
.table
[HD_MIN_ENERGY_OFDM_DET_INDEX
] =
383 cpu_to_le16((u16
)data
->nrg_th_ofdm
);
385 cmd
.table
[HD_BARKER_CORR_TH_ADD_MIN_INDEX
] =
386 __constant_cpu_to_le16(190);
387 cmd
.table
[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX
] =
388 __constant_cpu_to_le16(390);
389 cmd
.table
[HD_OFDM_ENERGY_TH_IN_INDEX
] =
390 __constant_cpu_to_le16(62);
392 IWL_DEBUG_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
393 data
->auto_corr_ofdm
, data
->auto_corr_ofdm_mrc
,
394 data
->auto_corr_ofdm_x1
, data
->auto_corr_ofdm_mrc_x1
,
397 IWL_DEBUG_CALIB("cck: ac %u mrc %u thresh %u\n",
398 data
->auto_corr_cck
, data
->auto_corr_cck_mrc
,
401 /* Update uCode's "work" table, and copy it to DSP */
402 cmd
.control
= SENSITIVITY_CMD_CONTROL_WORK_TABLE
;
404 /* Don't send command to uCode if nothing has changed */
405 if (!memcmp(&cmd
.table
[0], &(priv
->sensitivity_tbl
[0]),
406 sizeof(u16
)*HD_TABLE_SIZE
)) {
407 IWL_DEBUG_CALIB("No change in SENSITIVITY_CMD\n");
411 /* Copy table for comparison next time */
412 memcpy(&(priv
->sensitivity_tbl
[0]), &(cmd
.table
[0]),
413 sizeof(u16
)*HD_TABLE_SIZE
);
415 ret
= iwl_send_cmd(priv
, &cmd_out
);
417 IWL_ERROR("SENSITIVITY_CMD failed\n");
422 void iwl_init_sensitivity(struct iwl_priv
*priv
)
426 struct iwl_sensitivity_data
*data
= NULL
;
427 const struct iwl_sensitivity_ranges
*ranges
= priv
->hw_params
.sens
;
429 IWL_DEBUG_CALIB("Start iwl_init_sensitivity\n");
431 /* Clear driver's sensitivity algo data */
432 data
= &(priv
->sensitivity_data
);
435 /* can happen if IWLWIFI_RUN_TIME_CALIB is selected
436 * but no IWLXXXX_RUN_TIME_CALIB for specific is selected */
439 memset(data
, 0, sizeof(struct iwl_sensitivity_data
));
441 data
->num_in_cck_no_fa
= 0;
442 data
->nrg_curr_state
= IWL_FA_TOO_MANY
;
443 data
->nrg_prev_state
= IWL_FA_TOO_MANY
;
444 data
->nrg_silence_ref
= 0;
445 data
->nrg_silence_idx
= 0;
446 data
->nrg_energy_idx
= 0;
448 for (i
= 0; i
< 10; i
++)
449 data
->nrg_value
[i
] = 0;
451 for (i
= 0; i
< NRG_NUM_PREV_STAT_L
; i
++)
452 data
->nrg_silence_rssi
[i
] = 0;
454 data
->auto_corr_ofdm
= 90;
455 data
->auto_corr_ofdm_mrc
= ranges
->auto_corr_min_ofdm_mrc
;
456 data
->auto_corr_ofdm_x1
= ranges
->auto_corr_min_ofdm_x1
;
457 data
->auto_corr_ofdm_mrc_x1
= ranges
->auto_corr_min_ofdm_mrc_x1
;
458 data
->auto_corr_cck
= AUTO_CORR_CCK_MIN_VAL_DEF
;
459 data
->auto_corr_cck_mrc
= ranges
->auto_corr_min_cck_mrc
;
460 data
->nrg_th_cck
= ranges
->nrg_th_cck
;
461 data
->nrg_th_ofdm
= ranges
->nrg_th_ofdm
;
463 data
->last_bad_plcp_cnt_ofdm
= 0;
464 data
->last_fa_cnt_ofdm
= 0;
465 data
->last_bad_plcp_cnt_cck
= 0;
466 data
->last_fa_cnt_cck
= 0;
468 ret
|= iwl_sensitivity_write(priv
);
469 IWL_DEBUG_CALIB("<<return 0x%X\n", ret
);
471 EXPORT_SYMBOL(iwl_init_sensitivity
);
473 void iwl_sensitivity_calibration(struct iwl_priv
*priv
,
474 struct iwl4965_notif_statistics
*resp
)
483 struct iwl_sensitivity_data
*data
= NULL
;
484 struct statistics_rx_non_phy
*rx_info
= &(resp
->rx
.general
);
485 struct statistics_rx
*statistics
= &(resp
->rx
);
487 struct statistics_general_data statis
;
489 data
= &(priv
->sensitivity_data
);
491 if (!iwl_is_associated(priv
)) {
492 IWL_DEBUG_CALIB("<< - not associated\n");
496 spin_lock_irqsave(&priv
->lock
, flags
);
497 if (rx_info
->interference_data_flag
!= INTERFERENCE_DATA_AVAILABLE
) {
498 IWL_DEBUG_CALIB("<< invalid data.\n");
499 spin_unlock_irqrestore(&priv
->lock
, flags
);
503 /* Extract Statistics: */
504 rx_enable_time
= le32_to_cpu(rx_info
->channel_load
);
505 fa_cck
= le32_to_cpu(statistics
->cck
.false_alarm_cnt
);
506 fa_ofdm
= le32_to_cpu(statistics
->ofdm
.false_alarm_cnt
);
507 bad_plcp_cck
= le32_to_cpu(statistics
->cck
.plcp_err
);
508 bad_plcp_ofdm
= le32_to_cpu(statistics
->ofdm
.plcp_err
);
510 statis
.beacon_silence_rssi_a
=
511 le32_to_cpu(statistics
->general
.beacon_silence_rssi_a
);
512 statis
.beacon_silence_rssi_b
=
513 le32_to_cpu(statistics
->general
.beacon_silence_rssi_b
);
514 statis
.beacon_silence_rssi_c
=
515 le32_to_cpu(statistics
->general
.beacon_silence_rssi_c
);
516 statis
.beacon_energy_a
=
517 le32_to_cpu(statistics
->general
.beacon_energy_a
);
518 statis
.beacon_energy_b
=
519 le32_to_cpu(statistics
->general
.beacon_energy_b
);
520 statis
.beacon_energy_c
=
521 le32_to_cpu(statistics
->general
.beacon_energy_c
);
523 spin_unlock_irqrestore(&priv
->lock
, flags
);
525 IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time
);
527 if (!rx_enable_time
) {
528 IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n");
532 /* These statistics increase monotonically, and do not reset
533 * at each beacon. Calculate difference from last value, or just
534 * use the new statistics value if it has reset or wrapped around. */
535 if (data
->last_bad_plcp_cnt_cck
> bad_plcp_cck
)
536 data
->last_bad_plcp_cnt_cck
= bad_plcp_cck
;
538 bad_plcp_cck
-= data
->last_bad_plcp_cnt_cck
;
539 data
->last_bad_plcp_cnt_cck
+= bad_plcp_cck
;
542 if (data
->last_bad_plcp_cnt_ofdm
> bad_plcp_ofdm
)
543 data
->last_bad_plcp_cnt_ofdm
= bad_plcp_ofdm
;
545 bad_plcp_ofdm
-= data
->last_bad_plcp_cnt_ofdm
;
546 data
->last_bad_plcp_cnt_ofdm
+= bad_plcp_ofdm
;
549 if (data
->last_fa_cnt_ofdm
> fa_ofdm
)
550 data
->last_fa_cnt_ofdm
= fa_ofdm
;
552 fa_ofdm
-= data
->last_fa_cnt_ofdm
;
553 data
->last_fa_cnt_ofdm
+= fa_ofdm
;
556 if (data
->last_fa_cnt_cck
> fa_cck
)
557 data
->last_fa_cnt_cck
= fa_cck
;
559 fa_cck
-= data
->last_fa_cnt_cck
;
560 data
->last_fa_cnt_cck
+= fa_cck
;
563 /* Total aborted signal locks */
564 norm_fa_ofdm
= fa_ofdm
+ bad_plcp_ofdm
;
565 norm_fa_cck
= fa_cck
+ bad_plcp_cck
;
567 IWL_DEBUG_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck
,
568 bad_plcp_cck
, fa_ofdm
, bad_plcp_ofdm
);
570 iwl_sens_auto_corr_ofdm(priv
, norm_fa_ofdm
, rx_enable_time
);
571 iwl_sens_energy_cck(priv
, norm_fa_cck
, rx_enable_time
, &statis
);
572 iwl_sensitivity_write(priv
);
576 EXPORT_SYMBOL(iwl_sensitivity_calibration
);
579 * Accumulate 20 beacons of signal and noise statistics for each of
580 * 3 receivers/antennas/rx-chains, then figure out:
581 * 1) Which antennas are connected.
582 * 2) Differential rx gain settings to balance the 3 receivers.
584 void iwl_chain_noise_calibration(struct iwl_priv
*priv
,
585 struct iwl4965_notif_statistics
*stat_resp
)
587 struct iwl_chain_noise_data
*data
= NULL
;
595 u32 average_sig
[NUM_RX_CHAINS
] = {INITIALIZATION_VALUE
};
596 u32 average_noise
[NUM_RX_CHAINS
] = {INITIALIZATION_VALUE
};
598 u16 max_average_sig_antenna_i
;
599 u32 min_average_noise
= MIN_AVERAGE_NOISE_MAX_VALUE
;
600 u16 min_average_noise_antenna_i
= INITIALIZATION_VALUE
;
602 u16 rxon_chnum
= INITIALIZATION_VALUE
;
603 u16 stat_chnum
= INITIALIZATION_VALUE
;
606 u32 active_chains
= 0;
609 struct statistics_rx_non_phy
*rx_info
= &(stat_resp
->rx
.general
);
611 data
= &(priv
->chain_noise_data
);
613 /* Accumulate just the first 20 beacons after the first association,
614 * then we're done forever. */
615 if (data
->state
!= IWL_CHAIN_NOISE_ACCUMULATE
) {
616 if (data
->state
== IWL_CHAIN_NOISE_ALIVE
)
617 IWL_DEBUG_CALIB("Wait for noise calib reset\n");
621 spin_lock_irqsave(&priv
->lock
, flags
);
622 if (rx_info
->interference_data_flag
!= INTERFERENCE_DATA_AVAILABLE
) {
623 IWL_DEBUG_CALIB(" << Interference data unavailable\n");
624 spin_unlock_irqrestore(&priv
->lock
, flags
);
628 rxon_band24
= !!(priv
->staging_rxon
.flags
& RXON_FLG_BAND_24G_MSK
);
629 rxon_chnum
= le16_to_cpu(priv
->staging_rxon
.channel
);
630 stat_band24
= !!(stat_resp
->flag
& STATISTICS_REPLY_FLG_BAND_24G_MSK
);
631 stat_chnum
= le32_to_cpu(stat_resp
->flag
) >> 16;
633 /* Make sure we accumulate data for just the associated channel
634 * (even if scanning). */
635 if ((rxon_chnum
!= stat_chnum
) || (rxon_band24
!= stat_band24
)) {
636 IWL_DEBUG_CALIB("Stats not from chan=%d, band24=%d\n",
637 rxon_chnum
, rxon_band24
);
638 spin_unlock_irqrestore(&priv
->lock
, flags
);
642 /* Accumulate beacon statistics values across 20 beacons */
643 chain_noise_a
= le32_to_cpu(rx_info
->beacon_silence_rssi_a
) &
645 chain_noise_b
= le32_to_cpu(rx_info
->beacon_silence_rssi_b
) &
647 chain_noise_c
= le32_to_cpu(rx_info
->beacon_silence_rssi_c
) &
650 chain_sig_a
= le32_to_cpu(rx_info
->beacon_rssi_a
) & IN_BAND_FILTER
;
651 chain_sig_b
= le32_to_cpu(rx_info
->beacon_rssi_b
) & IN_BAND_FILTER
;
652 chain_sig_c
= le32_to_cpu(rx_info
->beacon_rssi_c
) & IN_BAND_FILTER
;
654 spin_unlock_irqrestore(&priv
->lock
, flags
);
656 data
->beacon_count
++;
658 data
->chain_noise_a
= (chain_noise_a
+ data
->chain_noise_a
);
659 data
->chain_noise_b
= (chain_noise_b
+ data
->chain_noise_b
);
660 data
->chain_noise_c
= (chain_noise_c
+ data
->chain_noise_c
);
662 data
->chain_signal_a
= (chain_sig_a
+ data
->chain_signal_a
);
663 data
->chain_signal_b
= (chain_sig_b
+ data
->chain_signal_b
);
664 data
->chain_signal_c
= (chain_sig_c
+ data
->chain_signal_c
);
666 IWL_DEBUG_CALIB("chan=%d, band24=%d, beacon=%d\n",
667 rxon_chnum
, rxon_band24
, data
->beacon_count
);
668 IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n",
669 chain_sig_a
, chain_sig_b
, chain_sig_c
);
670 IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n",
671 chain_noise_a
, chain_noise_b
, chain_noise_c
);
673 /* If this is the 20th beacon, determine:
674 * 1) Disconnected antennas (using signal strengths)
675 * 2) Differential gain (using silence noise) to balance receivers */
676 if (data
->beacon_count
!= CAL_NUM_OF_BEACONS
)
679 /* Analyze signal for disconnected antenna */
680 average_sig
[0] = (data
->chain_signal_a
) / CAL_NUM_OF_BEACONS
;
681 average_sig
[1] = (data
->chain_signal_b
) / CAL_NUM_OF_BEACONS
;
682 average_sig
[2] = (data
->chain_signal_c
) / CAL_NUM_OF_BEACONS
;
684 if (average_sig
[0] >= average_sig
[1]) {
685 max_average_sig
= average_sig
[0];
686 max_average_sig_antenna_i
= 0;
687 active_chains
= (1 << max_average_sig_antenna_i
);
689 max_average_sig
= average_sig
[1];
690 max_average_sig_antenna_i
= 1;
691 active_chains
= (1 << max_average_sig_antenna_i
);
694 if (average_sig
[2] >= max_average_sig
) {
695 max_average_sig
= average_sig
[2];
696 max_average_sig_antenna_i
= 2;
697 active_chains
= (1 << max_average_sig_antenna_i
);
700 IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n",
701 average_sig
[0], average_sig
[1], average_sig
[2]);
702 IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n",
703 max_average_sig
, max_average_sig_antenna_i
);
705 /* Compare signal strengths for all 3 receivers. */
706 for (i
= 0; i
< NUM_RX_CHAINS
; i
++) {
707 if (i
!= max_average_sig_antenna_i
) {
708 s32 rssi_delta
= (max_average_sig
- average_sig
[i
]);
710 /* If signal is very weak, compared with
711 * strongest, mark it as disconnected. */
712 if (rssi_delta
> MAXIMUM_ALLOWED_PATHLOSS
)
713 data
->disconn_array
[i
] = 1;
715 active_chains
|= (1 << i
);
716 IWL_DEBUG_CALIB("i = %d rssiDelta = %d "
717 "disconn_array[i] = %d\n",
718 i
, rssi_delta
, data
->disconn_array
[i
]);
723 for (i
= 0; i
< NUM_RX_CHAINS
; i
++) {
724 /* loops on all the bits of
725 * priv->hw_setting.valid_tx_ant */
726 u8 ant_msk
= (1 << i
);
727 if (!(priv
->hw_params
.valid_tx_ant
& ant_msk
))
731 if (data
->disconn_array
[i
] == 0)
732 /* there is a Tx antenna connected */
734 if (num_tx_chains
== priv
->hw_params
.tx_chains_num
&&
735 data
->disconn_array
[i
]) {
736 /* This is the last TX antenna and is also
737 * disconnected connect it anyway */
738 data
->disconn_array
[i
] = 0;
739 active_chains
|= ant_msk
;
740 IWL_DEBUG_CALIB("All Tx chains are disconnected W/A - "
741 "declare %d as connected\n", i
);
746 IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n",
749 /* Save for use within RXON, TX, SCAN commands, etc. */
750 priv
->valid_antenna
= active_chains
;
752 /* Analyze noise for rx balance */
753 average_noise
[0] = ((data
->chain_noise_a
)/CAL_NUM_OF_BEACONS
);
754 average_noise
[1] = ((data
->chain_noise_b
)/CAL_NUM_OF_BEACONS
);
755 average_noise
[2] = ((data
->chain_noise_c
)/CAL_NUM_OF_BEACONS
);
757 for (i
= 0; i
< NUM_RX_CHAINS
; i
++) {
758 if (!(data
->disconn_array
[i
]) &&
759 (average_noise
[i
] <= min_average_noise
)) {
760 /* This means that chain i is active and has
761 * lower noise values so far: */
762 min_average_noise
= average_noise
[i
];
763 min_average_noise_antenna_i
= i
;
767 IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n",
768 average_noise
[0], average_noise
[1],
771 IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n",
772 min_average_noise
, min_average_noise_antenna_i
);
774 priv
->cfg
->ops
->utils
->gain_computation(priv
, average_noise
,
775 min_average_noise_antenna_i
, min_average_noise
);
777 EXPORT_SYMBOL(iwl_chain_noise_calibration
);