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authorMohammed Shafi Shajakhan <mshajakhan@atheros.com>2011-05-13 20:31:09 +0530
committerJohn W. Linville <linville@tuxdriver.com>2011-05-16 14:10:46 -0400
commitb85c5734f00886ee0f33ef4d0038ed9a278eefce (patch)
tree8243a908c73cd799d45fb703e98a8ff60daca045 /drivers
parent8afbcc8bfb549a522298fa4a31ee5155c2b5f7a0 (diff)
ath9k: Implement an API to swap main/ALT LNA's
for the diversity group 2(AR9485) we swap the LNA's of main/ALT antenna based on alternate antenna's rssi average in comparision with main antenna's rssi, while for AR9285(antenna diversity group 0)we still follow the older method of looking at the packet count in alternate antenna Cc: Gabriel Tseng <Gabriel.Tseng@Atheros.com> Cc: Senthilkumar Balasubramanian <Senthilkumar.Balasubramanian@Atheros.com> Signed-off-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/ath/ath9k/recv.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c
index 85e05329a60..47e0fc1aaba 100644
--- a/drivers/net/wireless/ath/ath9k/recv.c
+++ b/drivers/net/wireless/ath/ath9k/recv.c
@@ -28,6 +28,33 @@ static inline bool ath_is_alt_ant_ratio_better(int alt_ratio, int maxdelta,
(alt_rssi_avg > main_rssi_avg + mindelta)) && (pkt_count > 50);
}
+static inline bool ath_ant_div_comb_alt_check(u8 div_group, int alt_ratio,
+ int curr_main_set, int curr_alt_set,
+ int alt_rssi_avg, int main_rssi_avg)
+{
+ bool result = false;
+ switch (div_group) {
+ case 0:
+ if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO)
+ result = true;
+ break;
+ case 1:
+ if ((((curr_main_set == ATH_ANT_DIV_COMB_LNA2) &&
+ (curr_alt_set == ATH_ANT_DIV_COMB_LNA1) &&
+ (alt_rssi_avg >= (main_rssi_avg - 5))) ||
+ ((curr_main_set == ATH_ANT_DIV_COMB_LNA1) &&
+ (curr_alt_set == ATH_ANT_DIV_COMB_LNA2) &&
+ (alt_rssi_avg >= (main_rssi_avg - 2)))) &&
+ (alt_rssi_avg >= 4))
+ result = true;
+ else
+ result = false;
+ break;
+ }
+
+ return result;
+}
+
static inline bool ath9k_check_auto_sleep(struct ath_softc *sc)
{
return sc->ps_enabled &&
@@ -1413,7 +1440,9 @@ static void ath_ant_comb_scan(struct ath_softc *sc, struct ath_rx_status *rs)
}
if (!antcomb->scan) {
- if (alt_ratio > ATH_ANT_DIV_COMB_ALT_ANT_RATIO) {
+ if (ath_ant_div_comb_alt_check(div_ant_conf.div_group,
+ alt_ratio, curr_main_set, curr_alt_set,
+ 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 =