ar9285_diversity.c revision 220593
1/* 2 * Copyright (c) 2008-2010 Atheros Communications Inc. 3 * Copyright (c) 2011 Adrian Chadd, Xenion Pty Ltd. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: head/sys/dev/ath/ath_hal/ar9002/ar9285_diversity.c 220593 2011-04-13 11:32:15Z adrian $ 27 */ 28#include "opt_ah.h" 29 30#include "ah.h" 31#include "ah_desc.h" 32#include "ah_internal.h" 33#include "ah_eeprom_v4k.h" 34 35#include "ar9002/ar9280.h" 36#include "ar9002/ar9285_diversity.h" 37#include "ar9002/ar9285.h" 38#include "ar5416/ar5416reg.h" 39#include "ar5416/ar5416phy.h" 40#include "ar9002/ar9285phy.h" 41#include "ar9002/ar9285_phy.h" 42 43 44/* Linux compability macros */ 45/* 46 * XXX these don't handle rounding, underflow, overflow, wrapping! 47 */ 48#define msecs_to_jiffies(a) ( (a) * hz / 1000 ) 49#define time_after(a, b) ( (long) (b) - (long) (a) < 0 ) 50 51static HAL_BOOL 52ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta, int mindelta, 53 int main_rssi_avg, int alt_rssi_avg, int pkt_count) 54{ 55 return (((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) && 56 (alt_rssi_avg > main_rssi_avg + maxdelta)) || 57 (alt_rssi_avg > main_rssi_avg + mindelta)) && (pkt_count > 50); 58} 59 60static void 61ath_lnaconf_alt_good_scan(struct ar9285_ant_comb *antcomb, 62 struct ar9285_antcomb_conf ant_conf, int main_rssi_avg) 63{ 64 antcomb->quick_scan_cnt = 0; 65 66 if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA2) 67 antcomb->rssi_lna2 = main_rssi_avg; 68 else if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA1) 69 antcomb->rssi_lna1 = main_rssi_avg; 70 71 switch ((ant_conf.main_lna_conf << 4) | ant_conf.alt_lna_conf) { 72 case (0x10): /* LNA2 A-B */ 73 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 74 antcomb->first_quick_scan_conf = 75 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 76 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1; 77 break; 78 case (0x20): /* LNA1 A-B */ 79 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 80 antcomb->first_quick_scan_conf = 81 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 82 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2; 83 break; 84 case (0x21): /* LNA1 LNA2 */ 85 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA2; 86 antcomb->first_quick_scan_conf = 87 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 88 antcomb->second_quick_scan_conf = 89 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 90 break; 91 case (0x12): /* LNA2 LNA1 */ 92 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1; 93 antcomb->first_quick_scan_conf = 94 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 95 antcomb->second_quick_scan_conf = 96 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 97 break; 98 case (0x13): /* LNA2 A+B */ 99 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 100 antcomb->first_quick_scan_conf = 101 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 102 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1; 103 break; 104 case (0x23): /* LNA1 A+B */ 105 antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 106 antcomb->first_quick_scan_conf = 107 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 108 antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2; 109 break; 110 default: 111 break; 112 } 113} 114 115static void 116ath_select_ant_div_from_quick_scan(struct ar9285_ant_comb *antcomb, 117 struct ar9285_antcomb_conf *div_ant_conf, int main_rssi_avg, 118 int alt_rssi_avg, int alt_ratio) 119{ 120 /* alt_good */ 121 switch (antcomb->quick_scan_cnt) { 122 case 0: 123 /* set alt to main, and alt to first conf */ 124 div_ant_conf->main_lna_conf = antcomb->main_conf; 125 div_ant_conf->alt_lna_conf = antcomb->first_quick_scan_conf; 126 break; 127 case 1: 128 /* set alt to main, and alt to first conf */ 129 div_ant_conf->main_lna_conf = antcomb->main_conf; 130 div_ant_conf->alt_lna_conf = antcomb->second_quick_scan_conf; 131 antcomb->rssi_first = main_rssi_avg; 132 antcomb->rssi_second = alt_rssi_avg; 133 134 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) { 135 /* main is LNA1 */ 136 if (ath_is_alt_ant_ratio_better(alt_ratio, 137 ATH_ANT_DIV_COMB_LNA1_DELTA_HI, 138 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, 139 main_rssi_avg, alt_rssi_avg, 140 antcomb->total_pkt_count)) 141 antcomb->first_ratio = AH_TRUE; 142 else 143 antcomb->first_ratio = AH_FALSE; 144 } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) { 145 if (ath_is_alt_ant_ratio_better(alt_ratio, 146 ATH_ANT_DIV_COMB_LNA1_DELTA_MID, 147 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, 148 main_rssi_avg, alt_rssi_avg, 149 antcomb->total_pkt_count)) 150 antcomb->first_ratio = AH_TRUE; 151 else 152 antcomb->first_ratio = AH_FALSE; 153 } else { 154 if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) && 155 (alt_rssi_avg > main_rssi_avg + 156 ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) || 157 (alt_rssi_avg > main_rssi_avg)) && 158 (antcomb->total_pkt_count > 50)) 159 antcomb->first_ratio = AH_TRUE; 160 else 161 antcomb->first_ratio = AH_FALSE; 162 } 163 break; 164 case 2: 165 antcomb->alt_good = AH_FALSE; 166 antcomb->scan_not_start = AH_FALSE; 167 antcomb->scan = AH_FALSE; 168 antcomb->rssi_first = main_rssi_avg; 169 antcomb->rssi_third = alt_rssi_avg; 170 171 if (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1) 172 antcomb->rssi_lna1 = alt_rssi_avg; 173 else if (antcomb->second_quick_scan_conf == 174 ATH_ANT_DIV_COMB_LNA2) 175 antcomb->rssi_lna2 = alt_rssi_avg; 176 else if (antcomb->second_quick_scan_conf == 177 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2) { 178 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) 179 antcomb->rssi_lna2 = main_rssi_avg; 180 else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) 181 antcomb->rssi_lna1 = main_rssi_avg; 182 } 183 184 if (antcomb->rssi_lna2 > antcomb->rssi_lna1 + 185 ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA) 186 div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2; 187 else 188 div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1; 189 190 if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) { 191 if (ath_is_alt_ant_ratio_better(alt_ratio, 192 ATH_ANT_DIV_COMB_LNA1_DELTA_HI, 193 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, 194 main_rssi_avg, alt_rssi_avg, 195 antcomb->total_pkt_count)) 196 antcomb->second_ratio = AH_TRUE; 197 else 198 antcomb->second_ratio = AH_FALSE; 199 } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) { 200 if (ath_is_alt_ant_ratio_better(alt_ratio, 201 ATH_ANT_DIV_COMB_LNA1_DELTA_MID, 202 ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, 203 main_rssi_avg, alt_rssi_avg, 204 antcomb->total_pkt_count)) 205 antcomb->second_ratio = AH_TRUE; 206 else 207 antcomb->second_ratio = AH_FALSE; 208 } else { 209 if ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) && 210 (alt_rssi_avg > main_rssi_avg + 211 ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) || 212 (alt_rssi_avg > main_rssi_avg)) && 213 (antcomb->total_pkt_count > 50)) 214 antcomb->second_ratio = AH_TRUE; 215 else 216 antcomb->second_ratio = AH_FALSE; 217 } 218 219 /* set alt to the conf with maximun ratio */ 220 if (antcomb->first_ratio && antcomb->second_ratio) { 221 if (antcomb->rssi_second > antcomb->rssi_third) { 222 /* first alt*/ 223 if ((antcomb->first_quick_scan_conf == 224 ATH_ANT_DIV_COMB_LNA1) || 225 (antcomb->first_quick_scan_conf == 226 ATH_ANT_DIV_COMB_LNA2)) 227 /* Set alt LNA1 or LNA2*/ 228 if (div_ant_conf->main_lna_conf == 229 ATH_ANT_DIV_COMB_LNA2) 230 div_ant_conf->alt_lna_conf = 231 ATH_ANT_DIV_COMB_LNA1; 232 else 233 div_ant_conf->alt_lna_conf = 234 ATH_ANT_DIV_COMB_LNA2; 235 else 236 /* Set alt to A+B or A-B */ 237 div_ant_conf->alt_lna_conf = 238 antcomb->first_quick_scan_conf; 239 } else if ((antcomb->second_quick_scan_conf == 240 ATH_ANT_DIV_COMB_LNA1) || 241 (antcomb->second_quick_scan_conf == 242 ATH_ANT_DIV_COMB_LNA2)) { 243 /* Set alt LNA1 or LNA2 */ 244 if (div_ant_conf->main_lna_conf == 245 ATH_ANT_DIV_COMB_LNA2) 246 div_ant_conf->alt_lna_conf = 247 ATH_ANT_DIV_COMB_LNA1; 248 else 249 div_ant_conf->alt_lna_conf = 250 ATH_ANT_DIV_COMB_LNA2; 251 } else { 252 /* Set alt to A+B or A-B */ 253 div_ant_conf->alt_lna_conf = 254 antcomb->second_quick_scan_conf; 255 } 256 } else if (antcomb->first_ratio) { 257 /* first alt */ 258 if ((antcomb->first_quick_scan_conf == 259 ATH_ANT_DIV_COMB_LNA1) || 260 (antcomb->first_quick_scan_conf == 261 ATH_ANT_DIV_COMB_LNA2)) 262 /* Set alt LNA1 or LNA2 */ 263 if (div_ant_conf->main_lna_conf == 264 ATH_ANT_DIV_COMB_LNA2) 265 div_ant_conf->alt_lna_conf = 266 ATH_ANT_DIV_COMB_LNA1; 267 else 268 div_ant_conf->alt_lna_conf = 269 ATH_ANT_DIV_COMB_LNA2; 270 else 271 /* Set alt to A+B or A-B */ 272 div_ant_conf->alt_lna_conf = 273 antcomb->first_quick_scan_conf; 274 } else if (antcomb->second_ratio) { 275 /* second alt */ 276 if ((antcomb->second_quick_scan_conf == 277 ATH_ANT_DIV_COMB_LNA1) || 278 (antcomb->second_quick_scan_conf == 279 ATH_ANT_DIV_COMB_LNA2)) 280 /* Set alt LNA1 or LNA2 */ 281 if (div_ant_conf->main_lna_conf == 282 ATH_ANT_DIV_COMB_LNA2) 283 div_ant_conf->alt_lna_conf = 284 ATH_ANT_DIV_COMB_LNA1; 285 else 286 div_ant_conf->alt_lna_conf = 287 ATH_ANT_DIV_COMB_LNA2; 288 else 289 /* Set alt to A+B or A-B */ 290 div_ant_conf->alt_lna_conf = 291 antcomb->second_quick_scan_conf; 292 } else { 293 /* main is largest */ 294 if ((antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) || 295 (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2)) 296 /* Set alt LNA1 or LNA2 */ 297 if (div_ant_conf->main_lna_conf == 298 ATH_ANT_DIV_COMB_LNA2) 299 div_ant_conf->alt_lna_conf = 300 ATH_ANT_DIV_COMB_LNA1; 301 else 302 div_ant_conf->alt_lna_conf = 303 ATH_ANT_DIV_COMB_LNA2; 304 else 305 /* Set alt to A+B or A-B */ 306 div_ant_conf->alt_lna_conf = antcomb->main_conf; 307 } 308 break; 309 default: 310 break; 311 } 312} 313 314static void 315ath_ant_div_conf_fast_divbias(struct ar9285_antcomb_conf *ant_conf) 316{ 317 /* Adjust the fast_div_bias based on main and alt lna conf */ 318 switch ((ant_conf->main_lna_conf << 4) | ant_conf->alt_lna_conf) { 319 case (0x01): /* A-B LNA2 */ 320 ant_conf->fast_div_bias = 0x3b; 321 break; 322 case (0x02): /* A-B LNA1 */ 323 ant_conf->fast_div_bias = 0x3d; 324 break; 325 case (0x03): /* A-B A+B */ 326 ant_conf->fast_div_bias = 0x1; 327 break; 328 case (0x10): /* LNA2 A-B */ 329 ant_conf->fast_div_bias = 0x7; 330 break; 331 case (0x12): /* LNA2 LNA1 */ 332 ant_conf->fast_div_bias = 0x2; 333 break; 334 case (0x13): /* LNA2 A+B */ 335 ant_conf->fast_div_bias = 0x7; 336 break; 337 case (0x20): /* LNA1 A-B */ 338 ant_conf->fast_div_bias = 0x6; 339 break; 340 case (0x21): /* LNA1 LNA2 */ 341 ant_conf->fast_div_bias = 0x0; 342 break; 343 case (0x23): /* LNA1 A+B */ 344 ant_conf->fast_div_bias = 0x6; 345 break; 346 case (0x30): /* A+B A-B */ 347 ant_conf->fast_div_bias = 0x1; 348 break; 349 case (0x31): /* A+B LNA2 */ 350 ant_conf->fast_div_bias = 0x3b; 351 break; 352 case (0x32): /* A+B LNA1 */ 353 ant_conf->fast_div_bias = 0x3d; 354 break; 355 default: 356 break; 357 } 358} 359 360/* Antenna diversity and combining */ 361void 362ar9285_ant_comb_scan(struct ath_hal *ah, struct ath_rx_status *rs, 363 unsigned long ticks, int hz) 364{ 365 struct ar9285_antcomb_conf div_ant_conf; 366 struct ar9285_ant_comb *antcomb = &AH9285(ah)->ant_comb; 367 int alt_ratio = 0, alt_rssi_avg = 0, main_rssi_avg = 0, curr_alt_set; 368 int curr_main_set, curr_bias; 369 int main_rssi = rs->rs_rssi_ctl[0]; 370 int alt_rssi = rs->rs_rssi_ctl[1]; 371 int rx_ant_conf, main_ant_conf; 372 HAL_BOOL short_scan = AH_FALSE; 373 374 rx_ant_conf = (rs->rs_rssi_ctl[2] >> ATH_ANT_RX_CURRENT_SHIFT) & 375 ATH_ANT_RX_MASK; 376 main_ant_conf = (rs->rs_rssi_ctl[2] >> ATH_ANT_RX_MAIN_SHIFT) & 377 ATH_ANT_RX_MASK; 378 379 /* Record packet only when alt_rssi is positive */ 380 if (alt_rssi > 0) { 381 antcomb->total_pkt_count++; 382 antcomb->main_total_rssi += main_rssi; 383 antcomb->alt_total_rssi += alt_rssi; 384 if (main_ant_conf == rx_ant_conf) 385 antcomb->main_recv_cnt++; 386 else 387 antcomb->alt_recv_cnt++; 388 } 389 390 /* Short scan check */ 391 if (antcomb->scan && antcomb->alt_good) { 392 if (time_after(ticks, antcomb->scan_start_time + 393 msecs_to_jiffies(ATH_ANT_DIV_COMB_SHORT_SCAN_INTR))) 394 short_scan = AH_TRUE; 395 else 396 if (antcomb->total_pkt_count == 397 ATH_ANT_DIV_COMB_SHORT_SCAN_PKTCOUNT) { 398 alt_ratio = ((antcomb->alt_recv_cnt * 100) / 399 antcomb->total_pkt_count); 400 if (alt_ratio < ATH_ANT_DIV_COMB_ALT_ANT_RATIO) 401 short_scan = AH_TRUE; 402 } 403 } 404 405 if (((antcomb->total_pkt_count < ATH_ANT_DIV_COMB_MAX_PKTCOUNT) || 406 rs->rs_moreaggr) && !short_scan) 407 return; 408 409 if (antcomb->total_pkt_count) { 410 alt_ratio = ((antcomb->alt_recv_cnt * 100) / 411 antcomb->total_pkt_count); 412 main_rssi_avg = (antcomb->main_total_rssi / 413 antcomb->total_pkt_count); 414 alt_rssi_avg = (antcomb->alt_total_rssi / 415 antcomb->total_pkt_count); 416 } 417 418 419 ar9285_antdiv_comb_conf_get(ah, &div_ant_conf); 420 curr_alt_set = div_ant_conf.alt_lna_conf; 421 curr_main_set = div_ant_conf.main_lna_conf; 422 curr_bias = div_ant_conf.fast_div_bias; 423 424 antcomb->count++; 425 426 if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) { 427 if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) { 428 ath_lnaconf_alt_good_scan(antcomb, div_ant_conf, 429 main_rssi_avg); 430 antcomb->alt_good = AH_TRUE; 431 } else { 432 antcomb->alt_good = AH_FALSE; 433 } 434 435 antcomb->count = 0; 436 antcomb->scan = AH_TRUE; 437 antcomb->scan_not_start = AH_TRUE; 438 } 439 440 if (!antcomb->scan) { 441 if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) { 442 if (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) { 443 /* Switch main and alt LNA */ 444 div_ant_conf.main_lna_conf = 445 ATH_ANT_DIV_COMB_LNA2; 446 div_ant_conf.alt_lna_conf = 447 ATH_ANT_DIV_COMB_LNA1; 448 } else if (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) { 449 div_ant_conf.main_lna_conf = 450 ATH_ANT_DIV_COMB_LNA1; 451 div_ant_conf.alt_lna_conf = 452 ATH_ANT_DIV_COMB_LNA2; 453 } 454 455 goto div_comb_done; 456 } else if ((curr_alt_set != ATH_ANT_DIV_COMB_LNA1) && 457 (curr_alt_set != ATH_ANT_DIV_COMB_LNA2)) { 458 /* Set alt to another LNA */ 459 if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) 460 div_ant_conf.alt_lna_conf = 461 ATH_ANT_DIV_COMB_LNA1; 462 else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) 463 div_ant_conf.alt_lna_conf = 464 ATH_ANT_DIV_COMB_LNA2; 465 466 goto div_comb_done; 467 } 468 469 if ((alt_rssi_avg < (main_rssi_avg + 470 ATH_ANT_DIV_COMB_LNA1_LNA2_DELTA))) 471 goto div_comb_done; 472 } 473 474 if (!antcomb->scan_not_start) { 475 switch (curr_alt_set) { 476 case ATH_ANT_DIV_COMB_LNA2: 477 antcomb->rssi_lna2 = alt_rssi_avg; 478 antcomb->rssi_lna1 = main_rssi_avg; 479 antcomb->scan = AH_TRUE; 480 /* set to A+B */ 481 div_ant_conf.main_lna_conf = 482 ATH_ANT_DIV_COMB_LNA1; 483 div_ant_conf.alt_lna_conf = 484 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 485 break; 486 case ATH_ANT_DIV_COMB_LNA1: 487 antcomb->rssi_lna1 = alt_rssi_avg; 488 antcomb->rssi_lna2 = main_rssi_avg; 489 antcomb->scan = AH_TRUE; 490 /* set to A+B */ 491 div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA2; 492 div_ant_conf.alt_lna_conf = 493 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 494 break; 495 case ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2: 496 antcomb->rssi_add = alt_rssi_avg; 497 antcomb->scan = AH_TRUE; 498 /* set to A-B */ 499 div_ant_conf.alt_lna_conf = 500 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 501 break; 502 case ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2: 503 antcomb->rssi_sub = alt_rssi_avg; 504 antcomb->scan = AH_FALSE; 505 if (antcomb->rssi_lna2 > 506 (antcomb->rssi_lna1 + 507 ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA)) { 508 /* use LNA2 as main LNA */ 509 if ((antcomb->rssi_add > antcomb->rssi_lna1) && 510 (antcomb->rssi_add > antcomb->rssi_sub)) { 511 /* set to A+B */ 512 div_ant_conf.main_lna_conf = 513 ATH_ANT_DIV_COMB_LNA2; 514 div_ant_conf.alt_lna_conf = 515 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 516 } else if (antcomb->rssi_sub > 517 antcomb->rssi_lna1) { 518 /* set to A-B */ 519 div_ant_conf.main_lna_conf = 520 ATH_ANT_DIV_COMB_LNA2; 521 div_ant_conf.alt_lna_conf = 522 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 523 } else { 524 /* set to LNA1 */ 525 div_ant_conf.main_lna_conf = 526 ATH_ANT_DIV_COMB_LNA2; 527 div_ant_conf.alt_lna_conf = 528 ATH_ANT_DIV_COMB_LNA1; 529 } 530 } else { 531 /* use LNA1 as main LNA */ 532 if ((antcomb->rssi_add > antcomb->rssi_lna2) && 533 (antcomb->rssi_add > antcomb->rssi_sub)) { 534 /* set to A+B */ 535 div_ant_conf.main_lna_conf = 536 ATH_ANT_DIV_COMB_LNA1; 537 div_ant_conf.alt_lna_conf = 538 ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; 539 } else if (antcomb->rssi_sub > 540 antcomb->rssi_lna1) { 541 /* set to A-B */ 542 div_ant_conf.main_lna_conf = 543 ATH_ANT_DIV_COMB_LNA1; 544 div_ant_conf.alt_lna_conf = 545 ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; 546 } else { 547 /* set to LNA2 */ 548 div_ant_conf.main_lna_conf = 549 ATH_ANT_DIV_COMB_LNA1; 550 div_ant_conf.alt_lna_conf = 551 ATH_ANT_DIV_COMB_LNA2; 552 } 553 } 554 break; 555 default: 556 break; 557 } 558 } else { 559 if (!antcomb->alt_good) { 560 antcomb->scan_not_start = AH_FALSE; 561 /* Set alt to another LNA */ 562 if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) { 563 div_ant_conf.main_lna_conf = 564 ATH_ANT_DIV_COMB_LNA2; 565 div_ant_conf.alt_lna_conf = 566 ATH_ANT_DIV_COMB_LNA1; 567 } else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) { 568 div_ant_conf.main_lna_conf = 569 ATH_ANT_DIV_COMB_LNA1; 570 div_ant_conf.alt_lna_conf = 571 ATH_ANT_DIV_COMB_LNA2; 572 } 573 goto div_comb_done; 574 } 575 } 576 577 ath_select_ant_div_from_quick_scan(antcomb, &div_ant_conf, 578 main_rssi_avg, alt_rssi_avg, 579 alt_ratio); 580 581 antcomb->quick_scan_cnt++; 582 583div_comb_done: 584 ath_ant_div_conf_fast_divbias(&div_ant_conf); 585 586 ar9285_antdiv_comb_conf_set(ah, &div_ant_conf); 587 588 antcomb->scan_start_time = ticks; 589 antcomb->total_pkt_count = 0; 590 antcomb->main_total_rssi = 0; 591 antcomb->alt_total_rssi = 0; 592 antcomb->main_recv_cnt = 0; 593 antcomb->alt_recv_cnt = 0; 594} 595