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ath9k_hw: do not lower ANI setting below default on AR913x

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When the amount of noise fluctuates strongly, low immunity settings
can sometimes disrupt signal detection on AR913x chips. When that
happens, no OFDM/CCK errors are reported anymore, and ANI tunes the
radio to the lowest immunity settings.
Usually rx/tx fails as well in that case.

To fix this, keep noise immunity settings at or above ANI default level,
which will keep radio parameters at or above INI values.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2014-04-27 16:37:39 +02:00 committed by John W. Linville
parent 38f3106a9b
commit ae9c25a182
1 changed files with 6 additions and 0 deletions
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6
drivers/net/wireless/ath/ath9k/ani.c
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@ -155,6 +155,9 @@ static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel,
ATH9K_ANI_RSSI_THR_LOW,
ATH9K_ANI_RSSI_THR_HIGH);
if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_OFDM_DEF_LEVEL)
immunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
if (!scan)
aniState->ofdmNoiseImmunityLevel = immunityLevel;
@ -235,6 +238,9 @@ static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel,
BEACON_RSSI(ah), ATH9K_ANI_RSSI_THR_LOW,
ATH9K_ANI_RSSI_THR_HIGH);
if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_CCK_DEF_LEVEL)
immunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
if (ah->opmode == NL80211_IFTYPE_STATION &&
BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_LOW &&
immunityLevel > ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI)