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linux-pinenote/drivers/net/wireless/ath/ath9k/antenna.c
Felix Fietkau e45e91d881 ath9k: add support for reporting per-chain signal strength 
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2013-12-18 15:23:19 -05:00

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/*
* 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;
}
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;
}
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;
}
}
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;
}
}
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;
}
}
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;
}
}
}
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;
}
}
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;
}
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;
}
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;
}
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