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Commit 102885a5 authored by Vasanthakumar Thiagarajan's avatar Vasanthakumar Thiagarajan Committed by John W. Linville
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ath9k: Implement an algorithm for Antenna diversity and combining 

This algorithm chooses the best main and alt lna out of
LNA1, LNA2, LNA1+LNA2 and LNA1-LNA2 to improve rx for single
chain chips(AR9285). This would greatly improve rx when there
is only one antenna is connected with AR9285.
Signed-off-by: default avatarVasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 21cc630f
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drivers/net/wireless/ath/ath9k/ath9k.h
View file @ 102885a5
...@@ -481,6 +481,60 @@ struct ath_led { ...@@ -481,6 +481,60 @@ struct ath_led {
void ath_init_leds(struct ath_softc *sc); void ath_init_leds(struct ath_softc *sc);
void ath_deinit_leds(struct ath_softc *sc); void ath_deinit_leds(struct ath_softc *sc);
/* Antenna diversity/combining */
#define ATH_ANT_RX_CURRENT_SHIFT 4
#define ATH_ANT_RX_MAIN_SHIFT 2
#define ATH_ANT_RX_MASK 0x3
#define ATH_ANT_DIV_COMB_SHORT_SCAN_INTR 50
#define ATH_ANT_DIV_COMB_SHORT_SCAN_PKTCOUNT 0x100
#define ATH_ANT_DIV_COMB_MAX_PKTCOUNT 0x200
#define ATH_ANT_DIV_COMB_INIT_COUNT 95
#define ATH_ANT_DIV_COMB_MAX_COUNT 100
#define ATH_ANT_DIV_COMB_ALT_ANT_RATIO 30
#define ATH_ANT_DIV_COMB_ALT_ANT_RATIO2 20
#define ATH_ANT_DIV_COMB_LNA1_LNA2_DELTA -3
#define ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA -1
#define ATH_ANT_DIV_COMB_LNA1_DELTA_HI -4
#define ATH_ANT_DIV_COMB_LNA1_DELTA_MID -2
#define ATH_ANT_DIV_COMB_LNA1_DELTA_LOW 2
enum ath9k_ant_div_comb_lna_conf {
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2,
ATH_ANT_DIV_COMB_LNA2,
ATH_ANT_DIV_COMB_LNA1,
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2,
};
struct ath_ant_comb {
u16 count;
u16 total_pkt_count;
bool scan;
bool scan_not_start;
int main_total_rssi;
int alt_total_rssi;
int alt_recv_cnt;
int main_recv_cnt;
int rssi_lna1;
int rssi_lna2;
int rssi_add;
int rssi_sub;
int rssi_first;
int rssi_second;
int rssi_third;
bool alt_good;
int quick_scan_cnt;
int main_conf;
enum ath9k_ant_div_comb_lna_conf first_quick_scan_conf;
enum ath9k_ant_div_comb_lna_conf second_quick_scan_conf;
int first_bias;
int second_bias;
bool first_ratio;
bool second_ratio;
unsigned long scan_start_time;
};
/********************/ /********************/
/* Main driver core */ /* Main driver core */
/********************/ /********************/
...@@ -597,6 +651,8 @@ struct ath_softc { ...@@ -597,6 +651,8 @@ struct ath_softc {
struct ath_btcoex btcoex; struct ath_btcoex btcoex;
struct ath_descdma txsdma; struct ath_descdma txsdma;
struct ath_ant_comb ant_comb;
}; };
struct ath_wiphy { struct ath_wiphy {
......
drivers/net/wireless/ath/ath9k/init.c
View file @ 102885a5
...@@ -531,6 +531,9 @@ static void ath9k_init_misc(struct ath_softc *sc) ...@@ -531,6 +531,9 @@ static void ath9k_init_misc(struct ath_softc *sc)
sc->beacon.bslot[i] = NULL; sc->beacon.bslot[i] = NULL;
sc->beacon.bslot_aphy[i] = NULL; sc->beacon.bslot_aphy[i] = NULL;
} }
if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB)
sc->ant_comb.count = ATH_ANT_DIV_COMB_INIT_COUNT;
} }
static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid, static int ath9k_init_softc(u16 devid, struct ath_softc *sc, u16 subsysid,
......
drivers/net/wireless/ath/ath9k/recv.c
View file @ 102885a5
...@@ -19,6 +19,15 @@ ...@@ -19,6 +19,15 @@
#define SKB_CB_ATHBUF(__skb) (*((struct ath_buf **)__skb->cb)) #define SKB_CB_ATHBUF(__skb) (*((struct ath_buf **)__skb->cb))
static inline bool ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta,
int mindelta, int main_rssi_avg,
int alt_rssi_avg, int pkt_count)
{
return (((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
(alt_rssi_avg > main_rssi_avg + maxdelta)) ||
(alt_rssi_avg > main_rssi_avg + mindelta)) && (pkt_count > 50);
}
static inline bool ath9k_check_auto_sleep(struct ath_softc *sc) static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
{ {
return sc->ps_enabled && return sc->ps_enabled &&
...@@ -1076,6 +1085,539 @@ static void ath9k_rx_skb_postprocess(struct ath_common *common, ...@@ -1076,6 +1085,539 @@ static void ath9k_rx_skb_postprocess(struct ath_common *common,
rxs->flag &= ~RX_FLAG_DECRYPTED; rxs->flag &= ~RX_FLAG_DECRYPTED;
} }
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_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(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(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 ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
(alt_rssi_avg > main_rssi_avg +
ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
(alt_rssi_avg > main_rssi_avg)) &&
(antcomb->total_pkt_count > 50))
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;
if (antcomb->second_quick_scan_conf == ATH_ANT_DIV_COMB_LNA1)
antcomb->rssi_lna1 = alt_rssi_avg;
else if (antcomb->second_quick_scan_conf ==
ATH_ANT_DIV_COMB_LNA2)
antcomb->rssi_lna2 = alt_rssi_avg;
else if (antcomb->second_quick_scan_conf ==
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;
}
if (antcomb->rssi_lna2 > antcomb->rssi_lna1 +
ATH_ANT_DIV_COMB_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(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(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 ((((alt_ratio >= ATH_ANT_DIV_COMB_ALT_ANT_RATIO2) &&
(alt_rssi_avg > main_rssi_avg +
ATH_ANT_DIV_COMB_LNA1_DELTA_HI)) ||
(alt_rssi_avg > main_rssi_avg)) &&
(antcomb->total_pkt_count > 50))
antcomb->second_ratio = true;
else
antcomb->second_ratio = false;
}
/* 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 (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
else
/* Set alt to A+B or A-B */
div_ant_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 (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
} else {
/* Set alt to A+B or A-B */
div_ant_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 (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
else
/* Set alt to A+B or A-B */
div_ant_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 (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
else
/* Set alt to A+B or A-B */
div_ant_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 (div_ant_conf->main_lna_conf ==
ATH_ANT_DIV_COMB_LNA2)
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
else
div_ant_conf->alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
else
/* Set alt to A+B or A-B */
div_ant_conf->alt_lna_conf = antcomb->main_conf;
}
break;
default:
break;
}
}
void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf)
{
/* 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;
}
}
/* Antenna diversity and combining */
static 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, curr_bias;
int main_rssi = rs->rs_rssi_ctl0;
int alt_rssi = rs->rs_rssi_ctl1;
int rx_ant_conf, main_ant_conf;
bool short_scan = false;
rx_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_CURRENT_SHIFT) &
ATH_ANT_RX_MASK;
main_ant_conf = (rs->rs_rssi_ctl2 >> ATH_ANT_RX_MAIN_SHIFT) &
ATH_ANT_RX_MASK;
/* Record packet only when alt_rssi is positive */
if (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++;
}
/* Short scan check */
if (antcomb->scan && antcomb->alt_good) {
if (time_after(jiffies, antcomb->scan_start_time +
msecs_to_jiffies(ATH_ANT_DIV_COMB_SHORT_SCAN_INTR)))
short_scan = true;
else
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 < ATH_ANT_DIV_COMB_ALT_ANT_RATIO)
short_scan = true;
}
}
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;
curr_bias = div_ant_conf.fast_div_bias;
antcomb->count++;
if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) {
if (alt_ratio > ATH_ANT_DIV_COMB_ALT_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) {
if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) {
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;
}
goto div_comb_done;
} 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;
goto div_comb_done;
}
if ((alt_rssi_avg < (main_rssi_avg +
ATH_ANT_DIV_COMB_LNA1_LNA2_DELTA)))
goto div_comb_done;
}
if (!antcomb->scan_not_start) {
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 */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_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 */
div_ant_conf.main_lna_conf = ATH_ANT_DIV_COMB_LNA2;
div_ant_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 */
div_ant_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 +
ATH_ANT_DIV_COMB_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 */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
} else if (antcomb->rssi_sub >
antcomb->rssi_lna1) {
/* set to A-B */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
} else {
/* set to LNA1 */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
div_ant_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 */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_PLUS_LNA2;
} else if (antcomb->rssi_sub >
antcomb->rssi_lna1) {
/* set to A-B */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA1_MINUS_LNA2;
} else {
/* set to LNA2 */
div_ant_conf.main_lna_conf =
ATH_ANT_DIV_COMB_LNA1;
div_ant_conf.alt_lna_conf =
ATH_ANT_DIV_COMB_LNA2;
}
}
break;
default:
break;
}
} 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);
ath9k_hw_antdiv_comb_conf_set(sc->sc_ah, &div_ant_conf);
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;
}
int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
{ {
struct ath_buf *bf; struct ath_buf *bf;
...@@ -1213,6 +1755,9 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp) ...@@ -1213,6 +1755,9 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
PS_WAIT_FOR_PSPOLL_DATA)))) PS_WAIT_FOR_PSPOLL_DATA))))
ath_rx_ps(sc, skb); ath_rx_ps(sc, skb);
if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB)
ath_ant_comb_scan(sc, &rs);
ath_rx_send_to_mac80211(hw, sc, skb, rxs); ath_rx_send_to_mac80211(hw, sc, skb, rxs);
requeue: requeue:
......
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