1 | /****************************************************************************** |
2 | * |
3 | * This file is provided under a dual BSD/GPLv2 license. When using or |
4 | * redistributing this file, you may do so under either license. |
5 | * |
6 | * GPL LICENSE SUMMARY |
7 | * |
8 | * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * General Public License for more details. |
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23 | * |
24 | * The full GNU General Public License is included in this distribution |
25 | * in the file called LICENSE.GPL. |
26 | * |
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28 | * Intel Linux Wireless <ilw@linux.intel.com> |
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30 | * |
31 | * BSD LICENSE |
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33 | * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved. |
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61 | *****************************************************************************/ |
62 | |
63 | #include <linux/slab.h> |
64 | #include <net/mac80211.h> |
65 | |
66 | #include "common.h" |
67 | #include "4965.h" |
68 | |
69 | /***************************************************************************** |
70 | * INIT calibrations framework |
71 | *****************************************************************************/ |
72 | |
73 | struct stats_general_data { |
74 | u32 ; |
75 | u32 ; |
76 | u32 ; |
77 | u32 beacon_energy_a; |
78 | u32 beacon_energy_b; |
79 | u32 beacon_energy_c; |
80 | }; |
81 | |
82 | /***************************************************************************** |
83 | * RUNTIME calibrations framework |
84 | *****************************************************************************/ |
85 | |
86 | /* "false alarms" are signals that our DSP tries to lock onto, |
87 | * but then determines that they are either noise, or transmissions |
88 | * from a distant wireless network (also "noise", really) that get |
89 | * "stepped on" by stronger transmissions within our own network. |
90 | * This algorithm attempts to set a sensitivity level that is high |
91 | * enough to receive all of our own network traffic, but not so |
92 | * high that our DSP gets too busy trying to lock onto non-network |
93 | * activity/noise. */ |
94 | static int |
95 | il4965_sens_energy_cck(struct il_priv *il, u32 norm_fa, u32 rx_enable_time, |
96 | struct stats_general_data *rx_info) |
97 | { |
98 | u32 max_nrg_cck = 0; |
99 | int i = 0; |
100 | u8 = 0; |
101 | u32 silence_ref = 0; |
102 | u8 = 0; |
103 | u8 = 0; |
104 | u8 = 0; |
105 | u32 val; |
106 | |
107 | /* "false_alarms" values below are cross-multiplications to assess the |
108 | * numbers of false alarms within the measured period of actual Rx |
109 | * (Rx is off when we're txing), vs the min/max expected false alarms |
110 | * (some should be expected if rx is sensitive enough) in a |
111 | * hypothetical listening period of 200 time units (TU), 204.8 msec: |
112 | * |
113 | * MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time |
114 | * |
115 | * */ |
116 | u32 false_alarms = norm_fa * 200 * 1024; |
117 | u32 max_false_alarms = MAX_FA_CCK * rx_enable_time; |
118 | u32 min_false_alarms = MIN_FA_CCK * rx_enable_time; |
119 | struct il_sensitivity_data *data = NULL; |
120 | const struct il_sensitivity_ranges *ranges = il->hw_params.sens; |
121 | |
122 | data = &(il->sensitivity_data); |
123 | |
124 | data->nrg_auto_corr_silence_diff = 0; |
125 | |
126 | /* Find max silence rssi among all 3 receivers. |
127 | * This is background noise, which may include transmissions from other |
128 | * networks, measured during silence before our network's beacon */ |
129 | silence_rssi_a = |
130 | (u8) ((rx_info->beacon_silence_rssi_a & ALL_BAND_FILTER) >> 8); |
131 | silence_rssi_b = |
132 | (u8) ((rx_info->beacon_silence_rssi_b & ALL_BAND_FILTER) >> 8); |
133 | silence_rssi_c = |
134 | (u8) ((rx_info->beacon_silence_rssi_c & ALL_BAND_FILTER) >> 8); |
135 | |
136 | val = max(silence_rssi_b, silence_rssi_c); |
137 | max_silence_rssi = max(silence_rssi_a, (u8) val); |
138 | |
139 | /* Store silence rssi in 20-beacon history table */ |
140 | data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi; |
141 | data->nrg_silence_idx++; |
142 | if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L) |
143 | data->nrg_silence_idx = 0; |
144 | |
145 | /* Find max silence rssi across 20 beacon history */ |
146 | for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) { |
147 | val = data->nrg_silence_rssi[i]; |
148 | silence_ref = max(silence_ref, val); |
149 | } |
150 | D_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n" , silence_rssi_a, |
151 | silence_rssi_b, silence_rssi_c, silence_ref); |
152 | |
153 | /* Find max rx energy (min value!) among all 3 receivers, |
154 | * measured during beacon frame. |
155 | * Save it in 10-beacon history table. */ |
156 | i = data->nrg_energy_idx; |
157 | val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c); |
158 | data->nrg_value[i] = min(rx_info->beacon_energy_a, val); |
159 | |
160 | data->nrg_energy_idx++; |
161 | if (data->nrg_energy_idx >= 10) |
162 | data->nrg_energy_idx = 0; |
163 | |
164 | /* Find min rx energy (max value) across 10 beacon history. |
165 | * This is the minimum signal level that we want to receive well. |
166 | * Add backoff (margin so we don't miss slightly lower energy frames). |
167 | * This establishes an upper bound (min value) for energy threshold. */ |
168 | max_nrg_cck = data->nrg_value[0]; |
169 | for (i = 1; i < 10; i++) |
170 | max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i])); |
171 | max_nrg_cck += 6; |
172 | |
173 | D_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n" , |
174 | rx_info->beacon_energy_a, rx_info->beacon_energy_b, |
175 | rx_info->beacon_energy_c, max_nrg_cck - 6); |
176 | |
177 | /* Count number of consecutive beacons with fewer-than-desired |
178 | * false alarms. */ |
179 | if (false_alarms < min_false_alarms) |
180 | data->num_in_cck_no_fa++; |
181 | else |
182 | data->num_in_cck_no_fa = 0; |
183 | D_CALIB("consecutive bcns with few false alarms = %u\n" , |
184 | data->num_in_cck_no_fa); |
185 | |
186 | /* If we got too many false alarms this time, reduce sensitivity */ |
187 | if (false_alarms > max_false_alarms && |
188 | data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK) { |
189 | D_CALIB("norm FA %u > max FA %u\n" , false_alarms, |
190 | max_false_alarms); |
191 | D_CALIB("... reducing sensitivity\n" ); |
192 | data->nrg_curr_state = IL_FA_TOO_MANY; |
193 | /* Store for "fewer than desired" on later beacon */ |
194 | data->nrg_silence_ref = silence_ref; |
195 | |
196 | /* increase energy threshold (reduce nrg value) |
197 | * to decrease sensitivity */ |
198 | data->nrg_th_cck = data->nrg_th_cck - NRG_STEP_CCK; |
199 | /* Else if we got fewer than desired, increase sensitivity */ |
200 | } else if (false_alarms < min_false_alarms) { |
201 | data->nrg_curr_state = IL_FA_TOO_FEW; |
202 | |
203 | /* Compare silence level with silence level for most recent |
204 | * healthy number or too many false alarms */ |
205 | data->nrg_auto_corr_silence_diff = |
206 | (s32) data->nrg_silence_ref - (s32) silence_ref; |
207 | |
208 | D_CALIB("norm FA %u < min FA %u, silence diff %d\n" , |
209 | false_alarms, min_false_alarms, |
210 | data->nrg_auto_corr_silence_diff); |
211 | |
212 | /* Increase value to increase sensitivity, but only if: |
213 | * 1a) previous beacon did *not* have *too many* false alarms |
214 | * 1b) AND there's a significant difference in Rx levels |
215 | * from a previous beacon with too many, or healthy # FAs |
216 | * OR 2) We've seen a lot of beacons (100) with too few |
217 | * false alarms */ |
218 | if (data->nrg_prev_state != IL_FA_TOO_MANY && |
219 | (data->nrg_auto_corr_silence_diff > NRG_DIFF || |
220 | data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA)) { |
221 | |
222 | D_CALIB("... increasing sensitivity\n" ); |
223 | /* Increase nrg value to increase sensitivity */ |
224 | val = data->nrg_th_cck + NRG_STEP_CCK; |
225 | data->nrg_th_cck = min((u32) ranges->min_nrg_cck, val); |
226 | } else { |
227 | D_CALIB("... but not changing sensitivity\n" ); |
228 | } |
229 | |
230 | /* Else we got a healthy number of false alarms, keep status quo */ |
231 | } else { |
232 | D_CALIB(" FA in safe zone\n" ); |
233 | data->nrg_curr_state = IL_FA_GOOD_RANGE; |
234 | |
235 | /* Store for use in "fewer than desired" with later beacon */ |
236 | data->nrg_silence_ref = silence_ref; |
237 | |
238 | /* If previous beacon had too many false alarms, |
239 | * give it some extra margin by reducing sensitivity again |
240 | * (but don't go below measured energy of desired Rx) */ |
241 | if (IL_FA_TOO_MANY == data->nrg_prev_state) { |
242 | D_CALIB("... increasing margin\n" ); |
243 | if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN)) |
244 | data->nrg_th_cck -= NRG_MARGIN; |
245 | else |
246 | data->nrg_th_cck = max_nrg_cck; |
247 | } |
248 | } |
249 | |
250 | /* Make sure the energy threshold does not go above the measured |
251 | * energy of the desired Rx signals (reduced by backoff margin), |
252 | * or else we might start missing Rx frames. |
253 | * Lower value is higher energy, so we use max()! |
254 | */ |
255 | data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck); |
256 | D_CALIB("new nrg_th_cck %u\n" , data->nrg_th_cck); |
257 | |
258 | data->nrg_prev_state = data->nrg_curr_state; |
259 | |
260 | /* Auto-correlation CCK algorithm */ |
261 | if (false_alarms > min_false_alarms) { |
262 | |
263 | /* increase auto_corr values to decrease sensitivity |
264 | * so the DSP won't be disturbed by the noise |
265 | */ |
266 | if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK) |
267 | data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1; |
268 | else { |
269 | val = data->auto_corr_cck + AUTO_CORR_STEP_CCK; |
270 | data->auto_corr_cck = |
271 | min((u32) ranges->auto_corr_max_cck, val); |
272 | } |
273 | val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK; |
274 | data->auto_corr_cck_mrc = |
275 | min((u32) ranges->auto_corr_max_cck_mrc, val); |
276 | } else if (false_alarms < min_false_alarms && |
277 | (data->nrg_auto_corr_silence_diff > NRG_DIFF || |
278 | data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA)) { |
279 | |
280 | /* Decrease auto_corr values to increase sensitivity */ |
281 | val = data->auto_corr_cck - AUTO_CORR_STEP_CCK; |
282 | data->auto_corr_cck = max((u32) ranges->auto_corr_min_cck, val); |
283 | val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK; |
284 | data->auto_corr_cck_mrc = |
285 | max((u32) ranges->auto_corr_min_cck_mrc, val); |
286 | } |
287 | |
288 | return 0; |
289 | } |
290 | |
291 | static int |
292 | il4965_sens_auto_corr_ofdm(struct il_priv *il, u32 norm_fa, u32 rx_enable_time) |
293 | { |
294 | u32 val; |
295 | u32 false_alarms = norm_fa * 200 * 1024; |
296 | u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time; |
297 | u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time; |
298 | struct il_sensitivity_data *data = NULL; |
299 | const struct il_sensitivity_ranges *ranges = il->hw_params.sens; |
300 | |
301 | data = &(il->sensitivity_data); |
302 | |
303 | /* If we got too many false alarms this time, reduce sensitivity */ |
304 | if (false_alarms > max_false_alarms) { |
305 | |
306 | D_CALIB("norm FA %u > max FA %u)\n" , false_alarms, |
307 | max_false_alarms); |
308 | |
309 | val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM; |
310 | data->auto_corr_ofdm = |
311 | min((u32) ranges->auto_corr_max_ofdm, val); |
312 | |
313 | val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM; |
314 | data->auto_corr_ofdm_mrc = |
315 | min((u32) ranges->auto_corr_max_ofdm_mrc, val); |
316 | |
317 | val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM; |
318 | data->auto_corr_ofdm_x1 = |
319 | min((u32) ranges->auto_corr_max_ofdm_x1, val); |
320 | |
321 | val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM; |
322 | data->auto_corr_ofdm_mrc_x1 = |
323 | min((u32) ranges->auto_corr_max_ofdm_mrc_x1, val); |
324 | } |
325 | |
326 | /* Else if we got fewer than desired, increase sensitivity */ |
327 | else if (false_alarms < min_false_alarms) { |
328 | |
329 | D_CALIB("norm FA %u < min FA %u\n" , false_alarms, |
330 | min_false_alarms); |
331 | |
332 | val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM; |
333 | data->auto_corr_ofdm = |
334 | max((u32) ranges->auto_corr_min_ofdm, val); |
335 | |
336 | val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM; |
337 | data->auto_corr_ofdm_mrc = |
338 | max((u32) ranges->auto_corr_min_ofdm_mrc, val); |
339 | |
340 | val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM; |
341 | data->auto_corr_ofdm_x1 = |
342 | max((u32) ranges->auto_corr_min_ofdm_x1, val); |
343 | |
344 | val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM; |
345 | data->auto_corr_ofdm_mrc_x1 = |
346 | max((u32) ranges->auto_corr_min_ofdm_mrc_x1, val); |
347 | } else { |
348 | D_CALIB("min FA %u < norm FA %u < max FA %u OK\n" , |
349 | min_false_alarms, false_alarms, max_false_alarms); |
350 | } |
351 | return 0; |
352 | } |
353 | |
354 | static void |
355 | il4965_prepare_legacy_sensitivity_tbl(struct il_priv *il, |
356 | struct il_sensitivity_data *data, |
357 | __le16 *tbl) |
358 | { |
359 | tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_IDX] = |
360 | cpu_to_le16((u16) data->auto_corr_ofdm); |
361 | tbl[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_IDX] = |
362 | cpu_to_le16((u16) data->auto_corr_ofdm_mrc); |
363 | tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_IDX] = |
364 | cpu_to_le16((u16) data->auto_corr_ofdm_x1); |
365 | tbl[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_IDX] = |
366 | cpu_to_le16((u16) data->auto_corr_ofdm_mrc_x1); |
367 | |
368 | tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_IDX] = |
369 | cpu_to_le16((u16) data->auto_corr_cck); |
370 | tbl[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_IDX] = |
371 | cpu_to_le16((u16) data->auto_corr_cck_mrc); |
372 | |
373 | tbl[HD_MIN_ENERGY_CCK_DET_IDX] = cpu_to_le16((u16) data->nrg_th_cck); |
374 | tbl[HD_MIN_ENERGY_OFDM_DET_IDX] = cpu_to_le16((u16) data->nrg_th_ofdm); |
375 | |
376 | tbl[HD_BARKER_CORR_TH_ADD_MIN_IDX] = |
377 | cpu_to_le16(data->barker_corr_th_min); |
378 | tbl[HD_BARKER_CORR_TH_ADD_MIN_MRC_IDX] = |
379 | cpu_to_le16(data->barker_corr_th_min_mrc); |
380 | tbl[HD_OFDM_ENERGY_TH_IN_IDX] = cpu_to_le16(data->nrg_th_cca); |
381 | |
382 | D_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n" , |
383 | data->auto_corr_ofdm, data->auto_corr_ofdm_mrc, |
384 | data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1, |
385 | data->nrg_th_ofdm); |
386 | |
387 | D_CALIB("cck: ac %u mrc %u thresh %u\n" , data->auto_corr_cck, |
388 | data->auto_corr_cck_mrc, data->nrg_th_cck); |
389 | } |
390 | |
391 | /* Prepare a C_SENSITIVITY, send to uCode if values have changed */ |
392 | static int |
393 | il4965_sensitivity_write(struct il_priv *il) |
394 | { |
395 | struct il_sensitivity_cmd cmd; |
396 | struct il_sensitivity_data *data = NULL; |
397 | struct il_host_cmd cmd_out = { |
398 | .id = C_SENSITIVITY, |
399 | .len = sizeof(struct il_sensitivity_cmd), |
400 | .flags = CMD_ASYNC, |
401 | .data = &cmd, |
402 | }; |
403 | |
404 | data = &(il->sensitivity_data); |
405 | |
406 | memset(&cmd, 0, sizeof(cmd)); |
407 | |
408 | il4965_prepare_legacy_sensitivity_tbl(il, data, tbl: &cmd.table[0]); |
409 | |
410 | /* Update uCode's "work" table, and copy it to DSP */ |
411 | cmd.control = C_SENSITIVITY_CONTROL_WORK_TBL; |
412 | |
413 | /* Don't send command to uCode if nothing has changed */ |
414 | if (!memcmp |
415 | (p: &cmd.table[0], q: &(il->sensitivity_tbl[0]), |
416 | size: sizeof(u16) * HD_TBL_SIZE)) { |
417 | D_CALIB("No change in C_SENSITIVITY\n" ); |
418 | return 0; |
419 | } |
420 | |
421 | /* Copy table for comparison next time */ |
422 | memcpy(&(il->sensitivity_tbl[0]), &(cmd.table[0]), |
423 | sizeof(u16) * HD_TBL_SIZE); |
424 | |
425 | return il_send_cmd(il, cmd: &cmd_out); |
426 | } |
427 | |
428 | void |
429 | il4965_init_sensitivity(struct il_priv *il) |
430 | { |
431 | int ret = 0; |
432 | int i; |
433 | struct il_sensitivity_data *data = NULL; |
434 | const struct il_sensitivity_ranges *ranges = il->hw_params.sens; |
435 | |
436 | if (il->disable_sens_cal) |
437 | return; |
438 | |
439 | D_CALIB("Start il4965_init_sensitivity\n" ); |
440 | |
441 | /* Clear driver's sensitivity algo data */ |
442 | data = &(il->sensitivity_data); |
443 | |
444 | if (ranges == NULL) |
445 | return; |
446 | |
447 | memset(data, 0, sizeof(struct il_sensitivity_data)); |
448 | |
449 | data->num_in_cck_no_fa = 0; |
450 | data->nrg_curr_state = IL_FA_TOO_MANY; |
451 | data->nrg_prev_state = IL_FA_TOO_MANY; |
452 | data->nrg_silence_ref = 0; |
453 | data->nrg_silence_idx = 0; |
454 | data->nrg_energy_idx = 0; |
455 | |
456 | for (i = 0; i < 10; i++) |
457 | data->nrg_value[i] = 0; |
458 | |
459 | for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) |
460 | data->nrg_silence_rssi[i] = 0; |
461 | |
462 | data->auto_corr_ofdm = ranges->auto_corr_min_ofdm; |
463 | data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc; |
464 | data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1; |
465 | data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1; |
466 | data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF; |
467 | data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc; |
468 | data->nrg_th_cck = ranges->nrg_th_cck; |
469 | data->nrg_th_ofdm = ranges->nrg_th_ofdm; |
470 | data->barker_corr_th_min = ranges->barker_corr_th_min; |
471 | data->barker_corr_th_min_mrc = ranges->barker_corr_th_min_mrc; |
472 | data->nrg_th_cca = ranges->nrg_th_cca; |
473 | |
474 | data->last_bad_plcp_cnt_ofdm = 0; |
475 | data->last_fa_cnt_ofdm = 0; |
476 | data->last_bad_plcp_cnt_cck = 0; |
477 | data->last_fa_cnt_cck = 0; |
478 | |
479 | ret |= il4965_sensitivity_write(il); |
480 | D_CALIB("<<return 0x%X\n" , ret); |
481 | } |
482 | |
483 | void |
484 | il4965_sensitivity_calibration(struct il_priv *il, void *resp) |
485 | { |
486 | u32 rx_enable_time; |
487 | u32 fa_cck; |
488 | u32 fa_ofdm; |
489 | u32 bad_plcp_cck; |
490 | u32 bad_plcp_ofdm; |
491 | u32 norm_fa_ofdm; |
492 | u32 norm_fa_cck; |
493 | struct il_sensitivity_data *data = NULL; |
494 | struct stats_rx_non_phy *rx_info; |
495 | struct stats_rx_phy *ofdm, *cck; |
496 | unsigned long flags; |
497 | struct stats_general_data statis; |
498 | |
499 | if (il->disable_sens_cal) |
500 | return; |
501 | |
502 | data = &(il->sensitivity_data); |
503 | |
504 | if (!il_is_any_associated(il)) { |
505 | D_CALIB("<< - not associated\n" ); |
506 | return; |
507 | } |
508 | |
509 | spin_lock_irqsave(&il->lock, flags); |
510 | |
511 | rx_info = &(((struct il_notif_stats *)resp)->rx.general); |
512 | ofdm = &(((struct il_notif_stats *)resp)->rx.ofdm); |
513 | cck = &(((struct il_notif_stats *)resp)->rx.cck); |
514 | |
515 | if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { |
516 | D_CALIB("<< invalid data.\n" ); |
517 | spin_unlock_irqrestore(lock: &il->lock, flags); |
518 | return; |
519 | } |
520 | |
521 | /* Extract Statistics: */ |
522 | rx_enable_time = le32_to_cpu(rx_info->channel_load); |
523 | fa_cck = le32_to_cpu(cck->false_alarm_cnt); |
524 | fa_ofdm = le32_to_cpu(ofdm->false_alarm_cnt); |
525 | bad_plcp_cck = le32_to_cpu(cck->plcp_err); |
526 | bad_plcp_ofdm = le32_to_cpu(ofdm->plcp_err); |
527 | |
528 | statis.beacon_silence_rssi_a = |
529 | le32_to_cpu(rx_info->beacon_silence_rssi_a); |
530 | statis.beacon_silence_rssi_b = |
531 | le32_to_cpu(rx_info->beacon_silence_rssi_b); |
532 | statis.beacon_silence_rssi_c = |
533 | le32_to_cpu(rx_info->beacon_silence_rssi_c); |
534 | statis.beacon_energy_a = le32_to_cpu(rx_info->beacon_energy_a); |
535 | statis.beacon_energy_b = le32_to_cpu(rx_info->beacon_energy_b); |
536 | statis.beacon_energy_c = le32_to_cpu(rx_info->beacon_energy_c); |
537 | |
538 | spin_unlock_irqrestore(lock: &il->lock, flags); |
539 | |
540 | D_CALIB("rx_enable_time = %u usecs\n" , rx_enable_time); |
541 | |
542 | if (!rx_enable_time) { |
543 | D_CALIB("<< RX Enable Time == 0!\n" ); |
544 | return; |
545 | } |
546 | |
547 | /* These stats increase monotonically, and do not reset |
548 | * at each beacon. Calculate difference from last value, or just |
549 | * use the new stats value if it has reset or wrapped around. */ |
550 | if (data->last_bad_plcp_cnt_cck > bad_plcp_cck) |
551 | data->last_bad_plcp_cnt_cck = bad_plcp_cck; |
552 | else { |
553 | bad_plcp_cck -= data->last_bad_plcp_cnt_cck; |
554 | data->last_bad_plcp_cnt_cck += bad_plcp_cck; |
555 | } |
556 | |
557 | if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm) |
558 | data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm; |
559 | else { |
560 | bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm; |
561 | data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm; |
562 | } |
563 | |
564 | if (data->last_fa_cnt_ofdm > fa_ofdm) |
565 | data->last_fa_cnt_ofdm = fa_ofdm; |
566 | else { |
567 | fa_ofdm -= data->last_fa_cnt_ofdm; |
568 | data->last_fa_cnt_ofdm += fa_ofdm; |
569 | } |
570 | |
571 | if (data->last_fa_cnt_cck > fa_cck) |
572 | data->last_fa_cnt_cck = fa_cck; |
573 | else { |
574 | fa_cck -= data->last_fa_cnt_cck; |
575 | data->last_fa_cnt_cck += fa_cck; |
576 | } |
577 | |
578 | /* Total aborted signal locks */ |
579 | norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm; |
580 | norm_fa_cck = fa_cck + bad_plcp_cck; |
581 | |
582 | D_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n" , fa_cck, |
583 | bad_plcp_cck, fa_ofdm, bad_plcp_ofdm); |
584 | |
585 | il4965_sens_auto_corr_ofdm(il, norm_fa: norm_fa_ofdm, rx_enable_time); |
586 | il4965_sens_energy_cck(il, norm_fa: norm_fa_cck, rx_enable_time, rx_info: &statis); |
587 | |
588 | il4965_sensitivity_write(il); |
589 | } |
590 | |
591 | static inline u8 |
592 | il4965_find_first_chain(u8 mask) |
593 | { |
594 | if (mask & ANT_A) |
595 | return CHAIN_A; |
596 | if (mask & ANT_B) |
597 | return CHAIN_B; |
598 | return CHAIN_C; |
599 | } |
600 | |
601 | /* |
602 | * Run disconnected antenna algorithm to find out which antennas are |
603 | * disconnected. |
604 | */ |
605 | static void |
606 | il4965_find_disconn_antenna(struct il_priv *il, u32 * average_sig, |
607 | struct il_chain_noise_data *data) |
608 | { |
609 | u32 active_chains = 0; |
610 | u32 max_average_sig; |
611 | u16 max_average_sig_antenna_i; |
612 | u8 num_tx_chains; |
613 | u8 first_chain; |
614 | u16 i = 0; |
615 | |
616 | average_sig[0] = |
617 | data->chain_signal_a / |
618 | il->cfg->chain_noise_num_beacons; |
619 | average_sig[1] = |
620 | data->chain_signal_b / |
621 | il->cfg->chain_noise_num_beacons; |
622 | average_sig[2] = |
623 | data->chain_signal_c / |
624 | il->cfg->chain_noise_num_beacons; |
625 | |
626 | if (average_sig[0] >= average_sig[1]) { |
627 | max_average_sig = average_sig[0]; |
628 | max_average_sig_antenna_i = 0; |
629 | active_chains = (1 << max_average_sig_antenna_i); |
630 | } else { |
631 | max_average_sig = average_sig[1]; |
632 | max_average_sig_antenna_i = 1; |
633 | active_chains = (1 << max_average_sig_antenna_i); |
634 | } |
635 | |
636 | if (average_sig[2] >= max_average_sig) { |
637 | max_average_sig = average_sig[2]; |
638 | max_average_sig_antenna_i = 2; |
639 | active_chains = (1 << max_average_sig_antenna_i); |
640 | } |
641 | |
642 | D_CALIB("average_sig: a %d b %d c %d\n" , average_sig[0], average_sig[1], |
643 | average_sig[2]); |
644 | D_CALIB("max_average_sig = %d, antenna %d\n" , max_average_sig, |
645 | max_average_sig_antenna_i); |
646 | |
647 | /* Compare signal strengths for all 3 receivers. */ |
648 | for (i = 0; i < NUM_RX_CHAINS; i++) { |
649 | if (i != max_average_sig_antenna_i) { |
650 | s32 = (max_average_sig - average_sig[i]); |
651 | |
652 | /* If signal is very weak, compared with |
653 | * strongest, mark it as disconnected. */ |
654 | if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS) |
655 | data->disconn_array[i] = 1; |
656 | else |
657 | active_chains |= (1 << i); |
658 | D_CALIB("i = %d rssiDelta = %d " |
659 | "disconn_array[i] = %d\n" , i, rssi_delta, |
660 | data->disconn_array[i]); |
661 | } |
662 | } |
663 | |
664 | /* |
665 | * The above algorithm sometimes fails when the ucode |
666 | * reports 0 for all chains. It's not clear why that |
667 | * happens to start with, but it is then causing trouble |
668 | * because this can make us enable more chains than the |
669 | * hardware really has. |
670 | * |
671 | * To be safe, simply mask out any chains that we know |
672 | * are not on the device. |
673 | */ |
674 | active_chains &= il->hw_params.valid_rx_ant; |
675 | |
676 | num_tx_chains = 0; |
677 | for (i = 0; i < NUM_RX_CHAINS; i++) { |
678 | /* loops on all the bits of |
679 | * il->hw_setting.valid_tx_ant */ |
680 | u8 ant_msk = (1 << i); |
681 | if (!(il->hw_params.valid_tx_ant & ant_msk)) |
682 | continue; |
683 | |
684 | num_tx_chains++; |
685 | if (data->disconn_array[i] == 0) |
686 | /* there is a Tx antenna connected */ |
687 | break; |
688 | if (num_tx_chains == il->hw_params.tx_chains_num && |
689 | data->disconn_array[i]) { |
690 | /* |
691 | * If all chains are disconnected |
692 | * connect the first valid tx chain |
693 | */ |
694 | first_chain = |
695 | il4965_find_first_chain(mask: il->cfg->valid_tx_ant); |
696 | data->disconn_array[first_chain] = 0; |
697 | active_chains |= BIT(first_chain); |
698 | D_CALIB("All Tx chains are disconnected" |
699 | "- declare %d as connected\n" , first_chain); |
700 | break; |
701 | } |
702 | } |
703 | |
704 | if (active_chains != il->hw_params.valid_rx_ant && |
705 | active_chains != il->chain_noise_data.active_chains) |
706 | D_CALIB("Detected that not all antennas are connected! " |
707 | "Connected: %#x, valid: %#x.\n" , active_chains, |
708 | il->hw_params.valid_rx_ant); |
709 | |
710 | /* Save for use within RXON, TX, SCAN commands, etc. */ |
711 | data->active_chains = active_chains; |
712 | D_CALIB("active_chains (bitwise) = 0x%x\n" , active_chains); |
713 | } |
714 | |
715 | static void |
716 | il4965_gain_computation(struct il_priv *il, u32 * average_noise, |
717 | u16 min_average_noise_antenna_i, u32 min_average_noise, |
718 | u8 default_chain) |
719 | { |
720 | int i, ret; |
721 | struct il_chain_noise_data *data = &il->chain_noise_data; |
722 | |
723 | data->delta_gain_code[min_average_noise_antenna_i] = 0; |
724 | |
725 | for (i = default_chain; i < NUM_RX_CHAINS; i++) { |
726 | s32 delta_g = 0; |
727 | |
728 | if (!data->disconn_array[i] && |
729 | data->delta_gain_code[i] == |
730 | CHAIN_NOISE_DELTA_GAIN_INIT_VAL) { |
731 | delta_g = average_noise[i] - min_average_noise; |
732 | data->delta_gain_code[i] = (u8) ((delta_g * 10) / 15); |
733 | data->delta_gain_code[i] = |
734 | min(data->delta_gain_code[i], |
735 | (u8) CHAIN_NOISE_MAX_DELTA_GAIN_CODE); |
736 | |
737 | data->delta_gain_code[i] = |
738 | (data->delta_gain_code[i] | (1 << 2)); |
739 | } else { |
740 | data->delta_gain_code[i] = 0; |
741 | } |
742 | } |
743 | D_CALIB("delta_gain_codes: a %d b %d c %d\n" , data->delta_gain_code[0], |
744 | data->delta_gain_code[1], data->delta_gain_code[2]); |
745 | |
746 | /* Differential gain gets sent to uCode only once */ |
747 | if (!data->radio_write) { |
748 | struct il_calib_diff_gain_cmd cmd; |
749 | data->radio_write = 1; |
750 | |
751 | memset(&cmd, 0, sizeof(cmd)); |
752 | cmd.hdr.op_code = IL_PHY_CALIBRATE_DIFF_GAIN_CMD; |
753 | cmd.diff_gain_a = data->delta_gain_code[0]; |
754 | cmd.diff_gain_b = data->delta_gain_code[1]; |
755 | cmd.diff_gain_c = data->delta_gain_code[2]; |
756 | ret = il_send_cmd_pdu(il, id: C_PHY_CALIBRATION, len: sizeof(cmd), data: &cmd); |
757 | if (ret) |
758 | D_CALIB("fail sending cmd " "C_PHY_CALIBRATION\n" ); |
759 | |
760 | /* TODO we might want recalculate |
761 | * rx_chain in rxon cmd */ |
762 | |
763 | /* Mark so we run this algo only once! */ |
764 | data->state = IL_CHAIN_NOISE_CALIBRATED; |
765 | } |
766 | } |
767 | |
768 | /* |
769 | * Accumulate 16 beacons of signal and noise stats for each of |
770 | * 3 receivers/antennas/rx-chains, then figure out: |
771 | * 1) Which antennas are connected. |
772 | * 2) Differential rx gain settings to balance the 3 receivers. |
773 | */ |
774 | void |
775 | il4965_chain_noise_calibration(struct il_priv *il, void *stat_resp) |
776 | { |
777 | struct il_chain_noise_data *data = NULL; |
778 | |
779 | u32 chain_noise_a; |
780 | u32 chain_noise_b; |
781 | u32 chain_noise_c; |
782 | u32 chain_sig_a; |
783 | u32 chain_sig_b; |
784 | u32 chain_sig_c; |
785 | u32 average_sig[NUM_RX_CHAINS] = { INITIALIZATION_VALUE }; |
786 | u32 average_noise[NUM_RX_CHAINS] = { INITIALIZATION_VALUE }; |
787 | u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE; |
788 | u16 min_average_noise_antenna_i = INITIALIZATION_VALUE; |
789 | u16 i = 0; |
790 | u16 rxon_chnum = INITIALIZATION_VALUE; |
791 | u16 stat_chnum = INITIALIZATION_VALUE; |
792 | u8 rxon_band24; |
793 | u8 stat_band24; |
794 | unsigned long flags; |
795 | struct stats_rx_non_phy *rx_info; |
796 | |
797 | if (il->disable_chain_noise_cal) |
798 | return; |
799 | |
800 | data = &(il->chain_noise_data); |
801 | |
802 | /* |
803 | * Accumulate just the first "chain_noise_num_beacons" after |
804 | * the first association, then we're done forever. |
805 | */ |
806 | if (data->state != IL_CHAIN_NOISE_ACCUMULATE) { |
807 | if (data->state == IL_CHAIN_NOISE_ALIVE) |
808 | D_CALIB("Wait for noise calib reset\n" ); |
809 | return; |
810 | } |
811 | |
812 | spin_lock_irqsave(&il->lock, flags); |
813 | |
814 | rx_info = &(((struct il_notif_stats *)stat_resp)->rx.general); |
815 | |
816 | if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) { |
817 | D_CALIB(" << Interference data unavailable\n" ); |
818 | spin_unlock_irqrestore(lock: &il->lock, flags); |
819 | return; |
820 | } |
821 | |
822 | rxon_band24 = !!(il->staging.flags & RXON_FLG_BAND_24G_MSK); |
823 | rxon_chnum = le16_to_cpu(il->staging.channel); |
824 | |
825 | stat_band24 = |
826 | !!(((struct il_notif_stats *)stat_resp)-> |
827 | flag & STATS_REPLY_FLG_BAND_24G_MSK); |
828 | stat_chnum = |
829 | le32_to_cpu(((struct il_notif_stats *)stat_resp)->flag) >> 16; |
830 | |
831 | /* Make sure we accumulate data for just the associated channel |
832 | * (even if scanning). */ |
833 | if (rxon_chnum != stat_chnum || rxon_band24 != stat_band24) { |
834 | D_CALIB("Stats not from chan=%d, band24=%d\n" , rxon_chnum, |
835 | rxon_band24); |
836 | spin_unlock_irqrestore(lock: &il->lock, flags); |
837 | return; |
838 | } |
839 | |
840 | /* |
841 | * Accumulate beacon stats values across |
842 | * "chain_noise_num_beacons" |
843 | */ |
844 | chain_noise_a = |
845 | le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER; |
846 | chain_noise_b = |
847 | le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER; |
848 | chain_noise_c = |
849 | le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER; |
850 | |
851 | chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER; |
852 | chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER; |
853 | chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER; |
854 | |
855 | spin_unlock_irqrestore(lock: &il->lock, flags); |
856 | |
857 | data->beacon_count++; |
858 | |
859 | data->chain_noise_a = (chain_noise_a + data->chain_noise_a); |
860 | data->chain_noise_b = (chain_noise_b + data->chain_noise_b); |
861 | data->chain_noise_c = (chain_noise_c + data->chain_noise_c); |
862 | |
863 | data->chain_signal_a = (chain_sig_a + data->chain_signal_a); |
864 | data->chain_signal_b = (chain_sig_b + data->chain_signal_b); |
865 | data->chain_signal_c = (chain_sig_c + data->chain_signal_c); |
866 | |
867 | D_CALIB("chan=%d, band24=%d, beacon=%d\n" , rxon_chnum, rxon_band24, |
868 | data->beacon_count); |
869 | D_CALIB("chain_sig: a %d b %d c %d\n" , chain_sig_a, chain_sig_b, |
870 | chain_sig_c); |
871 | D_CALIB("chain_noise: a %d b %d c %d\n" , chain_noise_a, chain_noise_b, |
872 | chain_noise_c); |
873 | |
874 | /* If this is the "chain_noise_num_beacons", determine: |
875 | * 1) Disconnected antennas (using signal strengths) |
876 | * 2) Differential gain (using silence noise) to balance receivers */ |
877 | if (data->beacon_count != il->cfg->chain_noise_num_beacons) |
878 | return; |
879 | |
880 | /* Analyze signal for disconnected antenna */ |
881 | il4965_find_disconn_antenna(il, average_sig, data); |
882 | |
883 | /* Analyze noise for rx balance */ |
884 | average_noise[0] = |
885 | data->chain_noise_a / il->cfg->chain_noise_num_beacons; |
886 | average_noise[1] = |
887 | data->chain_noise_b / il->cfg->chain_noise_num_beacons; |
888 | average_noise[2] = |
889 | data->chain_noise_c / il->cfg->chain_noise_num_beacons; |
890 | |
891 | for (i = 0; i < NUM_RX_CHAINS; i++) { |
892 | if (!data->disconn_array[i] && |
893 | average_noise[i] <= min_average_noise) { |
894 | /* This means that chain i is active and has |
895 | * lower noise values so far: */ |
896 | min_average_noise = average_noise[i]; |
897 | min_average_noise_antenna_i = i; |
898 | } |
899 | } |
900 | |
901 | D_CALIB("average_noise: a %d b %d c %d\n" , average_noise[0], |
902 | average_noise[1], average_noise[2]); |
903 | |
904 | D_CALIB("min_average_noise = %d, antenna %d\n" , min_average_noise, |
905 | min_average_noise_antenna_i); |
906 | |
907 | il4965_gain_computation(il, average_noise, min_average_noise_antenna_i, |
908 | min_average_noise, |
909 | default_chain: il4965_find_first_chain(mask: il->cfg->valid_rx_ant)); |
910 | |
911 | /* Some power changes may have been made during the calibration. |
912 | * Update and commit the RXON |
913 | */ |
914 | if (il->ops->update_chain_flags) |
915 | il->ops->update_chain_flags(il); |
916 | |
917 | data->state = IL_CHAIN_NOISE_DONE; |
918 | il_power_update_mode(il, force: false); |
919 | } |
920 | |
921 | void |
922 | il4965_reset_run_time_calib(struct il_priv *il) |
923 | { |
924 | int i; |
925 | memset(&(il->sensitivity_data), 0, sizeof(struct il_sensitivity_data)); |
926 | memset(&(il->chain_noise_data), 0, sizeof(struct il_chain_noise_data)); |
927 | for (i = 0; i < NUM_RX_CHAINS; i++) |
928 | il->chain_noise_data.delta_gain_code[i] = |
929 | CHAIN_NOISE_DELTA_GAIN_INIT_VAL; |
930 | |
931 | /* Ask for stats now, the uCode will send notification |
932 | * periodically after association */ |
933 | il_send_stats_request(il, flags: CMD_ASYNC, clear: true); |
934 | } |
935 | |