ath9k: improve noise immunity behavior for older chipsets (ar92xx and earlier), should improve stability
Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 39767
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Felix Fietkau
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@ -1,3 +1,41 @@
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commit 1abdeca3c6fb9cf1f84f85e78ed8d1c33bd69db0
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Author: Felix Fietkau <nbd@openwrt.org>
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Date: Fri Feb 28 18:52:56 2014 +0100
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ath9k_hw: tweak noise immunity thresholds for older chipsets
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Older chipsets are more sensitive to high PHY error counts, and the
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current noise immunity thresholds were based on tests run at QCA with
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newer chipsets.
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This patch brings back the values from the old ANI implementation for
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old chipsets, and it also disables weak signal detection on an earlier
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noise immunity level, to improve overall radio stability on affected
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devices.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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commit 431e506da5953adc3b65af25f4b90873d528c115
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Author: Felix Fietkau <nbd@openwrt.org>
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Date: Fri Feb 28 18:44:13 2014 +0100
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ath9k_hw: toggle weak signal detection in AP mode on older chipsets
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The commit 80b4205b "ath9k: Fix OFDM weak signal detection for AP mode"
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prevented weak signal detection changes from taking effect in AP mode on
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all chipsets, claiming it is "not allowed".
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The main reason for not disabling weak signal detection in AP mode is
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that typically beacon RSSI is used to track whether it is needed to
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boost range, and this is unavailable in AP mode for obvious reasons.
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The problem with not disabling weak signal detection is that older
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chipsets are very sensitive to high PHY error counts. When faced with
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heavy noise, this can lead to an excessive amount of "Failed to stop
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TX DMA" errors in the field.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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commit 98d1a6c5b14688ed030e81b889f607be308e0df9
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Author: Felix Fietkau <nbd@openwrt.org>
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Date: Mon Feb 24 22:20:32 2014 +0100
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@ -3591,3 +3629,81 @@ Date: Thu Jan 23 20:06:34 2014 +0100
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}
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static void ath9k_rx_skb_postprocess(struct ath_common *common,
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--- a/drivers/net/wireless/ath/ath9k/ani.c
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+++ b/drivers/net/wireless/ath/ath9k/ani.c
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@@ -176,16 +176,26 @@ static void ath9k_hw_set_ofdm_nil(struct
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if (ah->opmode == NL80211_IFTYPE_STATION &&
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BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_HIGH)
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weak_sig = true;
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-
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/*
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- * OFDM Weak signal detection is always enabled for AP mode.
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+ * Newer chipsets are better at dealing with high PHY error counts -
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+ * keep weak signal detection enabled when no RSSI threshold is
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+ * available to determine if it is needed (mode != STA)
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*/
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- if (ah->opmode != NL80211_IFTYPE_AP &&
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- aniState->ofdmWeakSigDetect != weak_sig) {
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- ath9k_hw_ani_control(ah,
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- ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
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- entry_ofdm->ofdm_weak_signal_on);
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- }
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+ else if (AR_SREV_9300_20_OR_LATER(ah) &&
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+ ah->opmode != NL80211_IFTYPE_STATION)
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+ weak_sig = true;
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+
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+ /* Older chipsets are more sensitive to high PHY error counts */
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+ else if (!AR_SREV_9300_20_OR_LATER(ah) &&
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+ aniState->ofdmNoiseImmunityLevel >= 8)
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+ weak_sig = false;
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+
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+ if (aniState->ofdmWeakSigDetect != weak_sig)
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+ ath9k_hw_ani_control(ah, ATH9K_ANI_OFDM_WEAK_SIGNAL_DETECTION,
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+ weak_sig);
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+
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+ if (!AR_SREV_9300_20_OR_LATER(ah))
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+ return;
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if (aniState->ofdmNoiseImmunityLevel >= ATH9K_ANI_OFDM_DEF_LEVEL) {
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ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
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@@ -483,10 +493,17 @@ void ath9k_hw_ani_init(struct ath_hw *ah
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ath_dbg(common, ANI, "Initialize ANI\n");
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- ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
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- ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
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- ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH;
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- ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW;
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+ if (AR_SREV_9300_20_OR_LATER(ah)) {
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+ ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH;
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+ ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW;
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+ ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH;
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+ ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW;
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+ } else {
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+ ah->config.ofdm_trig_high = ATH9K_ANI_OFDM_TRIG_HIGH_OLD;
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+ ah->config.ofdm_trig_low = ATH9K_ANI_OFDM_TRIG_LOW_OLD;
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+ ah->config.cck_trig_high = ATH9K_ANI_CCK_TRIG_HIGH_OLD;
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+ ah->config.cck_trig_low = ATH9K_ANI_CCK_TRIG_LOW_OLD;
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+ }
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ani->spurImmunityLevel = ATH9K_ANI_SPUR_IMMUNE_LVL;
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ani->firstepLevel = ATH9K_ANI_FIRSTEP_LVL;
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--- a/drivers/net/wireless/ath/ath9k/ani.h
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+++ b/drivers/net/wireless/ath/ath9k/ani.h
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@@ -22,12 +22,16 @@
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/* units are errors per second */
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#define ATH9K_ANI_OFDM_TRIG_HIGH 3500
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#define ATH9K_ANI_OFDM_TRIG_HIGH_BELOW_INI 1000
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+#define ATH9K_ANI_OFDM_TRIG_HIGH_OLD 500
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#define ATH9K_ANI_OFDM_TRIG_LOW 400
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#define ATH9K_ANI_OFDM_TRIG_LOW_ABOVE_INI 900
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+#define ATH9K_ANI_OFDM_TRIG_LOW_OLD 200
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#define ATH9K_ANI_CCK_TRIG_HIGH 600
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+#define ATH9K_ANI_CCK_TRIG_HIGH_OLD 200
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#define ATH9K_ANI_CCK_TRIG_LOW 300
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+#define ATH9K_ANI_CCK_TRIG_LOW_OLD 100
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#define ATH9K_ANI_SPUR_IMMUNE_LVL 3
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#define ATH9K_ANI_FIRSTEP_LVL 2
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@ -1,6 +1,6 @@
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--- a/drivers/net/wireless/ath/ath9k/ani.h
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+++ b/drivers/net/wireless/ath/ath9k/ani.h
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@@ -38,7 +38,7 @@
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@@ -42,7 +42,7 @@
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#define ATH9K_ANI_PERIOD 300
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/* in ms */
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