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Release 4.11 drivers/net/wireless/ath/ath9k/antenna.c

/*
 * Copyright (c) 2012 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "ath9k.h"

/*
 * AR9285
 * ======
 *
 * EEPROM has 2 4-bit fields containing the card configuration.
 *
 * antdiv_ctl1:
 * ------------
 * bb_enable_ant_div_lnadiv : 1
 * bb_ant_div_alt_gaintb    : 1
 * bb_ant_div_main_gaintb   : 1
 * bb_enable_ant_fast_div   : 1
 *
 * antdiv_ctl2:
 * -----------
 * bb_ant_div_alt_lnaconf  : 2
 * bb_ant_div_main_lnaconf : 2
 *
 * The EEPROM bits are used as follows:
 * ------------------------------------
 *
 * bb_enable_ant_div_lnadiv      - Enable LNA path rx antenna diversity/combining.
 *                                 Set in AR_PHY_MULTICHAIN_GAIN_CTL.
 *
 * bb_ant_div_[alt/main]_gaintb  - 0 -> Antenna config Alt/Main uses gaintable 0
 *                                 1 -> Antenna config Alt/Main uses gaintable 1
 *                                 Set in AR_PHY_MULTICHAIN_GAIN_CTL.
 *
 * bb_enable_ant_fast_div        - Enable fast antenna diversity.
 *                                 Set in AR_PHY_CCK_DETECT.
 *
 * bb_ant_div_[alt/main]_lnaconf - Alt/Main LNA diversity/combining input config.
 *                                 Set in AR_PHY_MULTICHAIN_GAIN_CTL.
 *                                 10=LNA1
 *                                 01=LNA2
 *                                 11=LNA1+LNA2
 *                                 00=LNA1-LNA2
 *
 * AR9485 / AR9565 / AR9331
 * ========================
 *
 * The same bits are present in the EEPROM, but the location in the
 * EEPROM is different (ant_div_control in ar9300_BaseExtension_1).
 *
 * ant_div_alt_lnaconf      ==> bit 0~1
 * ant_div_main_lnaconf     ==> bit 2~3
 * ant_div_alt_gaintb       ==> bit 4
 * ant_div_main_gaintb      ==> bit 5
 * enable_ant_div_lnadiv    ==> bit 6
 * enable_ant_fast_div      ==> bit 7
 */


static inline bool ath_is_alt_ant_ratio_better(struct ath_ant_comb *antcomb, int alt_ratio, int maxdelta, int mindelta, int main_rssi_avg, int alt_rssi_avg, int pkt_count) { if (pkt_count <= 50) return false; if (alt_rssi_avg > main_rssi_avg + mindelta) return true; if (alt_ratio >= antcomb->ant_ratio2 && alt_rssi_avg >= antcomb->low_rssi_thresh && (alt_rssi_avg > main_rssi_avg + maxdelta)) return true; return false; }

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static inline bool ath_ant_div_comb_alt_check(struct ath_hw_antcomb_conf *conf, struct ath_ant_comb *antcomb, int alt_ratio, int alt_rssi_avg, int main_rssi_avg) { bool result, set1, set2; result = set1 = set2 = false; if (conf->main_lna_conf == ATH_ANT_DIV_COMB_LNA2 && conf->alt_lna_conf == ATH_ANT_DIV_COMB_LNA1) set1 = true; if (conf->main_lna_conf == ATH_ANT_DIV_COMB_LNA1 && conf->alt_lna_conf == ATH_ANT_DIV_COMB_LNA2) set2 = true; switch (conf->div_group) { case 0: if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) result = true; break; case 1: case 2: if (alt_rssi_avg < 4 || alt_rssi_avg < antcomb->low_rssi_thresh) break; if ((set1 && (alt_rssi_avg >= (main_rssi_avg - 5))) || (set2 && (alt_rssi_avg >= (main_rssi_avg - 2))) || (alt_ratio > antcomb->ant_ratio)) result = true; break; case 3: if (alt_rssi_avg < 4 || alt_rssi_avg < antcomb->low_rssi_thresh) break; if ((set1 && (alt_rssi_avg >= (main_rssi_avg - 3))) || (set2 && (alt_rssi_avg >= (main_rssi_avg + 3))) || (alt_ratio > antcomb->ant_ratio)) result = true; break; } return result; }

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static void ath_lnaconf_alt_good_scan(struct ath_ant_comb *antcomb, struct ath_hw_antcomb_conf ant_conf, int main_rssi_avg) { antcomb->quick_scan_cnt = 0; if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA2) antcomb->rssi_lna2 = main_rssi_avg; else if (ant_conf.main_lna_conf == ATH_ANT_DIV_COMB_LNA1) antcomb->rssi_lna1 = main_rssi_avg; switch ((ant_conf.main_lna_conf << 4) | ant_conf.alt_lna_conf) { case 0x10: /* LNA2 A-B */ antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; antcomb->first_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1; break; case 0x20: /* LNA1 A-B */ antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; antcomb->first_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2; break; case 0x21: /* LNA1 LNA2 */ antcomb->main_conf = ATH_ANT_DIV_COMB_LNA2; antcomb->first_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; break; case 0x12: /* LNA2 LNA1 */ antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1; antcomb->first_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; break; case 0x13: /* LNA2 A+B */ antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; antcomb->first_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1; break; case 0x23: /* LNA1 A+B */ antcomb->main_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; antcomb->first_quick_scan_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; antcomb->second_quick_scan_conf = ATH_ANT_DIV_COMB_LNA2; break; default: break; } }

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static void ath_ant_set_alt_ratio(struct ath_ant_comb *antcomb, struct ath_hw_antcomb_conf *conf) { /* set alt to the conf with maximun ratio */ if (antcomb->first_ratio && antcomb->second_ratio) { if (antcomb->rssi_second > antcomb->rssi_third) { /* first alt*/ if ((antcomb->first_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1) || (antcomb->first_quick_scan_conf == ATH_ANT_DIV_COMB_LNA2)) /* Set alt LNA1 or LNA2*/ if (conf->main_lna_conf == ATH_ANT_DIV_COMB_LNA2) conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; else conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; else /* Set alt to A+B or A-B */ conf->alt_lna_conf = antcomb->first_quick_scan_conf; } else if ((antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1) || (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA2)) { /* Set alt LNA1 or LNA2 */ if (conf->main_lna_conf == ATH_ANT_DIV_COMB_LNA2) conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; else conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; } else { /* Set alt to A+B or A-B */ conf->alt_lna_conf = antcomb->second_quick_scan_conf; } } else if (antcomb->first_ratio) { /* first alt */ if ((antcomb->first_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1) || (antcomb->first_quick_scan_conf == ATH_ANT_DIV_COMB_LNA2)) /* Set alt LNA1 or LNA2 */ if (conf->main_lna_conf == ATH_ANT_DIV_COMB_LNA2) conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; else conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; else /* Set alt to A+B or A-B */ conf->alt_lna_conf = antcomb->first_quick_scan_conf; } else if (antcomb->second_ratio) { /* second alt */ if ((antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1) || (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA2)) /* Set alt LNA1 or LNA2 */ if (conf->main_lna_conf == ATH_ANT_DIV_COMB_LNA2) conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; else conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; else /* Set alt to A+B or A-B */ conf->alt_lna_conf = antcomb->second_quick_scan_conf; } else { /* main is largest */ if ((antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) || (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2)) /* Set alt LNA1 or LNA2 */ if (conf->main_lna_conf == ATH_ANT_DIV_COMB_LNA2) conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; else conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; else /* Set alt to A+B or A-B */ conf->alt_lna_conf = antcomb->main_conf; } }

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static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb, struct ath_hw_antcomb_conf *div_ant_conf, int main_rssi_avg, int alt_rssi_avg, int alt_ratio) { /* alt_good */ switch (antcomb->quick_scan_cnt) { case 0: /* set alt to main, and alt to first conf */ div_ant_conf->main_lna_conf = antcomb->main_conf; div_ant_conf->alt_lna_conf = antcomb->first_quick_scan_conf; break; case 1: /* set alt to main, and alt to first conf */ div_ant_conf->main_lna_conf = antcomb->main_conf; div_ant_conf->alt_lna_conf = antcomb->second_quick_scan_conf; antcomb->rssi_first = main_rssi_avg; antcomb->rssi_second = alt_rssi_avg; if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) { /* main is LNA1 */ if (ath_is_alt_ant_ratio_better(antcomb, alt_ratio, ATH_ANT_DIV_COMB_LNA1_DELTA_HI, ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, main_rssi_avg, alt_rssi_avg, antcomb->total_pkt_count)) antcomb->first_ratio = true; else antcomb->first_ratio = false; } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) { if (ath_is_alt_ant_ratio_better(antcomb, alt_ratio, ATH_ANT_DIV_COMB_LNA1_DELTA_MID, ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, main_rssi_avg, alt_rssi_avg, antcomb->total_pkt_count)) antcomb->first_ratio = true; else antcomb->first_ratio = false; } else { if (ath_is_alt_ant_ratio_better(antcomb, alt_ratio, ATH_ANT_DIV_COMB_LNA1_DELTA_HI, 0, main_rssi_avg, alt_rssi_avg, antcomb->total_pkt_count)) antcomb->first_ratio = true; else antcomb->first_ratio = false; } break; case 2: antcomb->alt_good = false; antcomb->scan_not_start = false; antcomb->scan = false; antcomb->rssi_first = main_rssi_avg; antcomb->rssi_third = alt_rssi_avg; switch(antcomb->second_quick_scan_conf) { case ATH_ANT_DIV_COMB_LNA1: antcomb->rssi_lna1 = alt_rssi_avg; break; case ATH_ANT_DIV_COMB_LNA2: antcomb->rssi_lna2 = alt_rssi_avg; break; case ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2: if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) antcomb->rssi_lna2 = main_rssi_avg; else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) antcomb->rssi_lna1 = main_rssi_avg; break; default: break; } if (antcomb->rssi_lna2 > antcomb->rssi_lna1 + div_ant_conf->lna1_lna2_switch_delta) div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2; else div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1; if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) { if (ath_is_alt_ant_ratio_better(antcomb, alt_ratio, ATH_ANT_DIV_COMB_LNA1_DELTA_HI, ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, main_rssi_avg, alt_rssi_avg, antcomb->total_pkt_count)) antcomb->second_ratio = true; else antcomb->second_ratio = false; } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) { if (ath_is_alt_ant_ratio_better(antcomb, alt_ratio, ATH_ANT_DIV_COMB_LNA1_DELTA_MID, ATH_ANT_DIV_COMB_LNA1_DELTA_LOW, main_rssi_avg, alt_rssi_avg, antcomb->total_pkt_count)) antcomb->second_ratio = true; else antcomb->second_ratio = false; } else { if (ath_is_alt_ant_ratio_better(antcomb, alt_ratio, ATH_ANT_DIV_COMB_LNA1_DELTA_HI, 0, main_rssi_avg, alt_rssi_avg, antcomb->total_pkt_count)) antcomb->second_ratio = true; else antcomb->second_ratio = false; } ath_ant_set_alt_ratio(antcomb, div_ant_conf); break; default: break; } }

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static void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf, struct ath_ant_comb *antcomb, int alt_ratio) { ant_conf->main_gaintb = 0; ant_conf->alt_gaintb = 0; if (ant_conf->div_group == 0) { /* Adjust the fast_div_bias based on main and alt lna conf */ switch ((ant_conf->main_lna_conf << 4) | ant_conf->alt_lna_conf) { case 0x01: /* A-B LNA2 */ ant_conf->fast_div_bias = 0x3b; break; case 0x02: /* A-B LNA1 */ ant_conf->fast_div_bias = 0x3d; break; case 0x03: /* A-B A+B */ ant_conf->fast_div_bias = 0x1; break; case 0x10: /* LNA2 A-B */ ant_conf->fast_div_bias = 0x7; break; case 0x12: /* LNA2 LNA1 */ ant_conf->fast_div_bias = 0x2; break; case 0x13: /* LNA2 A+B */ ant_conf->fast_div_bias = 0x7; break; case 0x20: /* LNA1 A-B */ ant_conf->fast_div_bias = 0x6; break; case 0x21: /* LNA1 LNA2 */ ant_conf->fast_div_bias = 0x0; break; case 0x23: /* LNA1 A+B */ ant_conf->fast_div_bias = 0x6; break; case 0x30: /* A+B A-B */ ant_conf->fast_div_bias = 0x1; break; case 0x31: /* A+B LNA2 */ ant_conf->fast_div_bias = 0x3b; break; case 0x32: /* A+B LNA1 */ ant_conf->fast_div_bias = 0x3d; break; default: break; } } else if (ant_conf->div_group == 1) { /* Adjust the fast_div_bias based on main and alt_lna_conf */ switch ((ant_conf->main_lna_conf << 4) | ant_conf->alt_lna_conf) { case 0x01: /* A-B LNA2 */ ant_conf->fast_div_bias = 0x1; break; case 0x02: /* A-B LNA1 */ ant_conf->fast_div_bias = 0x1; break; case 0x03: /* A-B A+B */ ant_conf->fast_div_bias = 0x1; break; case 0x10: /* LNA2 A-B */ if (!(antcomb->scan) && (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) ant_conf->fast_div_bias = 0x3f; else ant_conf->fast_div_bias = 0x1; break; case 0x12: /* LNA2 LNA1 */ ant_conf->fast_div_bias = 0x1; break; case 0x13: /* LNA2 A+B */ if (!(antcomb->scan) && (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) ant_conf->fast_div_bias = 0x3f; else ant_conf->fast_div_bias = 0x1; break; case 0x20: /* LNA1 A-B */ if (!(antcomb->scan) && (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) ant_conf->fast_div_bias = 0x3f; else ant_conf->fast_div_bias = 0x1; break; case 0x21: /* LNA1 LNA2 */ ant_conf->fast_div_bias = 0x1; break; case 0x23: /* LNA1 A+B */ if (!(antcomb->scan) && (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) ant_conf->fast_div_bias = 0x3f; else ant_conf->fast_div_bias = 0x1; break; case 0x30: /* A+B A-B */ ant_conf->fast_div_bias = 0x1; break; case 0x31: /* A+B LNA2 */ ant_conf->fast_div_bias = 0x1; break; case 0x32: /* A+B LNA1 */ ant_conf->fast_div_bias = 0x1; break; default: break; } } else if (ant_conf->div_group == 2) { /* Adjust the fast_div_bias based on main and alt_lna_conf */ switch ((ant_conf->main_lna_conf << 4) | ant_conf->alt_lna_conf) { case 0x01: /* A-B LNA2 */ ant_conf->fast_div_bias = 0x1; break; case 0x02: /* A-B LNA1 */ ant_conf->fast_div_bias = 0x1; break; case 0x03: /* A-B A+B */ ant_conf->fast_div_bias = 0x1; break; case 0x10: /* LNA2 A-B */ if (!antcomb->scan && (alt_ratio > antcomb->ant_ratio)) ant_conf->fast_div_bias = 0x1; else ant_conf->fast_div_bias = 0x2; break; case 0x12: /* LNA2 LNA1 */ ant_conf->fast_div_bias = 0x1; break; case 0x13: /* LNA2 A+B */ if (!antcomb->scan && (alt_ratio > antcomb->ant_ratio)) ant_conf->fast_div_bias = 0x1; else ant_conf->fast_div_bias = 0x2; break; case 0x20: /* LNA1 A-B */ if (!antcomb->scan && (alt_ratio > antcomb->ant_ratio)) ant_conf->fast_div_bias = 0x1; else ant_conf->fast_div_bias = 0x2; break; case 0x21: /* LNA1 LNA2 */ ant_conf->fast_div_bias = 0x1; break; case 0x23: /* LNA1 A+B */ if (!antcomb->scan && (alt_ratio > antcomb->ant_ratio)) ant_conf->fast_div_bias = 0x1; else ant_conf->fast_div_bias = 0x2; break; case 0x30: /* A+B A-B */ ant_conf->fast_div_bias = 0x1; break; case 0x31: /* A+B LNA2 */ ant_conf->fast_div_bias = 0x1; break; case 0x32: /* A+B LNA1 */ ant_conf->fast_div_bias = 0x1; break; default: break; } if (antcomb->fast_div_bias) ant_conf->fast_div_bias = antcomb->fast_div_bias; } else if (ant_conf->div_group == 3) { switch ((ant_conf->main_lna_conf << 4) | ant_conf->alt_lna_conf) { case 0x01: /* A-B LNA2 */ ant_conf->fast_div_bias = 0x1; break; case 0x02: /* A-B LNA1 */ ant_conf->fast_div_bias = 0x39; break; case 0x03: /* A-B A+B */ ant_conf->fast_div_bias = 0x1; break; case 0x10: /* LNA2 A-B */ ant_conf->fast_div_bias = 0x2; break; case 0x12: /* LNA2 LNA1 */ ant_conf->fast_div_bias = 0x3f; break; case 0x13: /* LNA2 A+B */ ant_conf->fast_div_bias = 0x2; break; case 0x20: /* LNA1 A-B */ ant_conf->fast_div_bias = 0x3; break; case 0x21: /* LNA1 LNA2 */ ant_conf->fast_div_bias = 0x3; break; case 0x23: /* LNA1 A+B */ ant_conf->fast_div_bias = 0x3; break; case 0x30: /* A+B A-B */ ant_conf->fast_div_bias = 0x1; break; case 0x31: /* A+B LNA2 */ ant_conf->fast_div_bias = 0x6; break; case 0x32: /* A+B LNA1 */ ant_conf->fast_div_bias = 0x1; break; default: break; } } }

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static void ath_ant_try_scan(struct ath_ant_comb *antcomb, struct ath_hw_antcomb_conf *conf, int curr_alt_set, int alt_rssi_avg, int main_rssi_avg) { switch (curr_alt_set) { case ATH_ANT_DIV_COMB_LNA2: antcomb->rssi_lna2 = alt_rssi_avg; antcomb->rssi_lna1 = main_rssi_avg; antcomb->scan = true; /* set to A+B */ conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1; conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; break; case ATH_ANT_DIV_COMB_LNA1: antcomb->rssi_lna1 = alt_rssi_avg; antcomb->rssi_lna2 = main_rssi_avg; antcomb->scan = true; /* set to A+B */ conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2; conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; break; case ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2: antcomb->rssi_add = alt_rssi_avg; antcomb->scan = true; /* set to A-B */ conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; break; case ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2: antcomb->rssi_sub = alt_rssi_avg; antcomb->scan = false; if (antcomb->rssi_lna2 > (antcomb->rssi_lna1 + conf->lna1_lna2_switch_delta)) { /* use LNA2 as main LNA */ if ((antcomb->rssi_add > antcomb->rssi_lna1) && (antcomb->rssi_add > antcomb->rssi_sub)) { /* set to A+B */ conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2; conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; } else if (antcomb->rssi_sub > antcomb->rssi_lna1) { /* set to A-B */ conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2; conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; } else { /* set to LNA1 */ conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2; conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; } } else { /* use LNA1 as main LNA */ if ((antcomb->rssi_add > antcomb->rssi_lna2) && (antcomb->rssi_add > antcomb->rssi_sub)) { /* set to A+B */ conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1; conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2; } else if (antcomb->rssi_sub > antcomb->rssi_lna1) { /* set to A-B */ conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1; conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2; } else { /* set to LNA2 */ conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1; conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; } } break; default: break; } }

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Sujith Manoharan323100.00%6100.00%
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static bool ath_ant_try_switch(struct ath_hw_antcomb_conf *div_ant_conf, struct ath_ant_comb *antcomb, int alt_ratio, int alt_rssi_avg, int main_rssi_avg, int curr_main_set, int curr_alt_set) { bool ret = false; if (ath_ant_div_comb_alt_check(div_ant_conf, antcomb, alt_ratio, alt_rssi_avg, main_rssi_avg)) { if (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) { /* * Switch main and alt LNA. */ div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA2; div_ant_conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; } else if (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) { div_ant_conf->main_lna_conf = ATH_ANT_DIV_COMB_LNA1; div_ant_conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; } ret = true; } else if ((curr_alt_set != ATH_ANT_DIV_COMB_LNA1) && (curr_alt_set != ATH_ANT_DIV_COMB_LNA2)) { /* Set alt to another LNA. */ if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) div_ant_conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) div_ant_conf->alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; ret = true; } return ret; }

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PersonTokensPropCommitsCommitProp
Sujith Manoharan149100.00%4100.00%
Total149100.00%4100.00%


static bool ath_ant_short_scan_check(struct ath_ant_comb *antcomb) { int alt_ratio; if (!antcomb->scan || !antcomb->alt_good) return false; if (time_after(jiffies, antcomb->scan_start_time + msecs_to_jiffies(ATH_ANT_DIV_COMB_SHORT_SCAN_INTR))) return true; if (antcomb->total_pkt_count == ATH_ANT_DIV_COMB_SHORT_SCAN_PKTCOUNT) { alt_ratio = ((antcomb->alt_recv_cnt * 100) / antcomb->total_pkt_count); if (alt_ratio < antcomb->ant_ratio) return true; } return false; }

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PersonTokensPropCommitsCommitProp
Sujith Manoharan88100.00%3100.00%
Total88100.00%3100.00%


void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs) { struct ath_hw_antcomb_conf div_ant_conf; struct ath_ant_comb *antcomb = &sc->ant_comb; int alt_ratio = 0, alt_rssi_avg = 0, main_rssi_avg = 0, curr_alt_set; int curr_main_set; int main_rssi = rs->rs_rssi_ctl[0]; int alt_rssi = rs->rs_rssi_ctl[1]; int rx_ant_conf, main_ant_conf; bool short_scan = false, ret; rx_ant_conf = (rs->rs_rssi_ctl[2] >> ATH_ANT_RX_CURRENT_SHIFT) & ATH_ANT_RX_MASK; main_ant_conf = (rs->rs_rssi_ctl[2] >> ATH_ANT_RX_MAIN_SHIFT) & ATH_ANT_RX_MASK; if (alt_rssi >= antcomb->low_rssi_thresh) { antcomb->ant_ratio = ATH_ANT_DIV_COMB_ALT_ANT_RATIO; antcomb->ant_ratio2 = ATH_ANT_DIV_COMB_ALT_ANT_RATIO2; } else { antcomb->ant_ratio = ATH_ANT_DIV_COMB_ALT_ANT_RATIO_LOW_RSSI; antcomb->ant_ratio2 = ATH_ANT_DIV_COMB_ALT_ANT_RATIO2_LOW_RSSI; } /* Record packet only when both main_rssi and alt_rssi is positive */ if (main_rssi > 0 && alt_rssi > 0) { antcomb->total_pkt_count++; antcomb->main_total_rssi += main_rssi; antcomb->alt_total_rssi += alt_rssi; if (main_ant_conf == rx_ant_conf) antcomb->main_recv_cnt++; else antcomb->alt_recv_cnt++; } if (main_ant_conf == rx_ant_conf) { ANT_STAT_INC(ANT_MAIN, recv_cnt); ANT_LNA_INC(ANT_MAIN, rx_ant_conf); } else { ANT_STAT_INC(ANT_ALT, recv_cnt); ANT_LNA_INC(ANT_ALT, rx_ant_conf); } /* Short scan check */ short_scan = ath_ant_short_scan_check(antcomb); if (((antcomb->total_pkt_count < ATH_ANT_DIV_COMB_MAX_PKTCOUNT) || rs->rs_moreaggr) && !short_scan) return; if (antcomb->total_pkt_count) { alt_ratio = ((antcomb->alt_recv_cnt * 100) / antcomb->total_pkt_count); main_rssi_avg = (antcomb->main_total_rssi / antcomb->total_pkt_count); alt_rssi_avg = (antcomb->alt_total_rssi / antcomb->total_pkt_count); } ath9k_hw_antdiv_comb_conf_get(sc->sc_ah, &div_ant_conf); curr_alt_set = div_ant_conf.alt_lna_conf; curr_main_set = div_ant_conf.main_lna_conf; antcomb->count++; if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) { if (alt_ratio > antcomb->ant_ratio) { ath_lnaconf_alt_good_scan(antcomb, div_ant_conf, main_rssi_avg); antcomb->alt_good = true; } else { antcomb->alt_good = false; } antcomb->count = 0; antcomb->scan = true; antcomb->scan_not_start = true; } if (!antcomb->scan) { ret = ath_ant_try_switch(&div_ant_conf, antcomb, alt_ratio, alt_rssi_avg, main_rssi_avg, curr_main_set, curr_alt_set); if (ret) goto div_comb_done; } if (!antcomb->scan && (alt_rssi_avg < (main_rssi_avg + div_ant_conf.lna1_lna2_delta))) goto div_comb_done; if (!antcomb->scan_not_start) { ath_ant_try_scan(antcomb, &div_ant_conf, curr_alt_set, alt_rssi_avg, main_rssi_avg); } else { if (!antcomb->alt_good) { antcomb->scan_not_start = false; /* Set alt to another LNA */ if (curr_main_set == ATH_ANT_DIV_COMB_LNA2) { div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA2; div_ant_conf.alt_lna_conf = ATH_ANT_DIV_COMB_LNA1; } else if (curr_main_set == ATH_ANT_DIV_COMB_LNA1) { div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA1; div_ant_conf.alt_lna_conf = ATH_ANT_DIV_COMB_LNA2; } goto div_comb_done; } ath_select_ant_div_from_quick_scan(antcomb, &div_ant_conf, main_rssi_avg, alt_rssi_avg, alt_ratio); antcomb->quick_scan_cnt++; } div_comb_done: ath_ant_div_conf_fast_divbias(&div_ant_conf, antcomb, alt_ratio); ath9k_hw_antdiv_comb_conf_set(sc->sc_ah, &div_ant_conf); ath9k_debug_stat_ant(sc, &div_ant_conf, main_rssi_avg, alt_rssi_avg); antcomb->scan_start_time = jiffies; antcomb->total_pkt_count = 0; antcomb->main_total_rssi = 0; antcomb->alt_total_rssi = 0; antcomb->main_recv_cnt = 0; antcomb->alt_recv_cnt = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Sujith Manoharan61497.46%583.33%
Felix Fietkau162.54%116.67%
Total630100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Sujith Manoharan335199.52%1493.33%
Felix Fietkau160.48%16.67%
Total3367100.00%15100.00%
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