From 3afa6b4f54181e88814680e71b2f12fae64057f4 Mon Sep 17 00:00:00 2001 From: Sujith Manoharan Date: Sun, 4 Aug 2013 14:21:54 +0530 Subject: [PATCH] ath9k: Fix antenna diversity for CUS198 CUS198/CUS230 need a few tweaks in the antenna diversity algorithm to accomodate RSSI variation. Add a couple of knobs to control low RSSI threshold and fast antenna diversity bias values. Signed-off-by: Sujith Manoharan Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/antenna.c | 73 ++++++++++++++++++++------------ drivers/net/wireless/ath/ath9k/ath9k.h | 10 +++++ drivers/net/wireless/ath/ath9k/init.c | 2 + 3 files changed, 59 insertions(+), 26 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/antenna.c b/drivers/net/wireless/ath/ath9k/antenna.c index 4cd2bce..8de314c 100644 --- a/drivers/net/wireless/ath/ath9k/antenna.c +++ b/drivers/net/wireless/ath/ath9k/antenna.c @@ -68,16 +68,27 @@ * enable_ant_fast_div ==> bit 7 */ -static inline bool ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta, +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) { - 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); + 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) { @@ -100,20 +111,22 @@ static inline bool ath_ant_div_comb_alt_check(struct ath_hw_antcomb_conf *conf, break; case 1: case 2: - if (alt_rssi_avg < 4) + 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)))) + (set2 && (alt_rssi_avg >= (main_rssi_avg - 2))) || + (alt_ratio > antcomb->ant_ratio)) result = true; break; case 3: - if (alt_rssi_avg < 4) + 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)))) + (set2 && (alt_rssi_avg >= (main_rssi_avg + 3))) || + (alt_ratio > antcomb->ant_ratio)) result = true; break; @@ -266,7 +279,7 @@ static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb, if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA1) { /* main is LNA1 */ - if (ath_is_alt_ant_ratio_better(alt_ratio, + 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, @@ -275,7 +288,7 @@ static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb, else antcomb->first_ratio = false; } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) { - if (ath_is_alt_ant_ratio_better(alt_ratio, + 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, @@ -284,7 +297,7 @@ static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb, else antcomb->first_ratio = false; } else { - if (ath_is_alt_ant_ratio_better(alt_ratio, + if (ath_is_alt_ant_ratio_better(antcomb, alt_ratio, ATH_ANT_DIV_COMB_LNA1_DELTA_HI, 0, main_rssi_avg, alt_rssi_avg, @@ -325,7 +338,7 @@ static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb, 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, + 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, @@ -334,7 +347,7 @@ static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb, else antcomb->second_ratio = false; } else if (antcomb->main_conf == ATH_ANT_DIV_COMB_LNA2) { - if (ath_is_alt_ant_ratio_better(alt_ratio, + 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, @@ -343,7 +356,7 @@ static void ath_select_ant_div_from_quick_scan(struct ath_ant_comb *antcomb, else antcomb->second_ratio = false; } else { - if (ath_is_alt_ant_ratio_better(alt_ratio, + if (ath_is_alt_ant_ratio_better(antcomb, alt_ratio, ATH_ANT_DIV_COMB_LNA1_DELTA_HI, 0, main_rssi_avg, alt_rssi_avg, @@ -484,8 +497,7 @@ static void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf, ant_conf->fast_div_bias = 0x1; break; case 0x10: /* LNA2 A-B */ - if (!(antcomb->scan) && - (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) + if (!antcomb->scan && (alt_ratio > antcomb->ant_ratio)) ant_conf->fast_div_bias = 0x1; else ant_conf->fast_div_bias = 0x2; @@ -494,15 +506,13 @@ static void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf, ant_conf->fast_div_bias = 0x1; break; case 0x13: /* LNA2 A+B */ - if (!(antcomb->scan) && - (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) + 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 > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) + if (!antcomb->scan && (alt_ratio > antcomb->ant_ratio)) ant_conf->fast_div_bias = 0x1; else ant_conf->fast_div_bias = 0x2; @@ -511,8 +521,7 @@ static void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf, ant_conf->fast_div_bias = 0x1; break; case 0x23: /* LNA1 A+B */ - if (!(antcomb->scan) && - (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)) + if (!antcomb->scan && (alt_ratio > antcomb->ant_ratio)) ant_conf->fast_div_bias = 0x1; else ant_conf->fast_div_bias = 0x2; @@ -529,6 +538,9 @@ static void ath_ant_div_conf_fast_divbias(struct ath_hw_antcomb_conf *ant_conf, 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) { @@ -668,13 +680,14 @@ static void ath_ant_try_scan(struct ath_ant_comb *antcomb, } 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, alt_ratio, + 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) { /* @@ -718,7 +731,7 @@ static bool ath_ant_short_scan_check(struct ath_ant_comb *antcomb) 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) + if (alt_ratio < antcomb->ant_ratio) return true; } @@ -741,6 +754,14 @@ void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs) main_ant_conf = (rs->rs_rssi_ctl2 >> 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++; @@ -783,7 +804,7 @@ void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs) antcomb->count++; if (antcomb->count == ATH_ANT_DIV_COMB_MAX_COUNT) { - if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) { + if (alt_ratio > antcomb->ant_ratio) { ath_lnaconf_alt_good_scan(antcomb, div_ant_conf, main_rssi_avg); antcomb->alt_good = true; @@ -797,7 +818,7 @@ void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs) } if (!antcomb->scan) { - ret = ath_ant_try_switch(&div_ant_conf, alt_ratio, + 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) diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h index ed8f8ef..74009f1 100644 --- a/drivers/net/wireless/ath/ath9k/ath9k.h +++ b/drivers/net/wireless/ath/ath9k/ath9k.h @@ -585,6 +585,8 @@ static inline void ath_fill_led_pin(struct ath_softc *sc) #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_ALT_ANT_RATIO_LOW_RSSI 50 +#define ATH_ANT_DIV_COMB_ALT_ANT_RATIO2_LOW_RSSI 50 #define ATH_ANT_DIV_COMB_LNA1_LNA2_SWITCH_DELTA -1 #define ATH_ANT_DIV_COMB_LNA1_DELTA_HI -4 @@ -607,6 +609,8 @@ struct ath_ant_comb { int rssi_first; int rssi_second; int rssi_third; + int ant_ratio; + int ant_ratio2; bool alt_good; int quick_scan_cnt; enum ath9k_ant_div_comb_lna_conf main_conf; @@ -615,6 +619,12 @@ struct ath_ant_comb { bool first_ratio; bool second_ratio; unsigned long scan_start_time; + + /* + * Card-specific config values. + */ + int low_rssi_thresh; + int fast_div_bias; }; void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs); diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c index 16f8b20..7ded9d6 100644 --- a/drivers/net/wireless/ath/ath9k/init.c +++ b/drivers/net/wireless/ath/ath9k/init.c @@ -525,6 +525,8 @@ static void ath9k_init_platform(struct ath_softc *sc) ATH9K_PCI_CUS230)) { ah->config.xlna_gpio = 9; ah->config.xatten_margin_cfg = true; + sc->ant_comb.low_rssi_thresh = 20; + sc->ant_comb.fast_div_bias = 3; ath_info(common, "Set parameters for %s\n", (sc->driver_data & ATH9K_PCI_CUS198) ? -- 2.7.4