ath9k: Store noise immunity values across scanning

CCK/OFDM noise immunilty values are always reset to defaults
during bgscan. This could affect the link quality and
performance when the STA is associated in a noisy channel.
So do not override the learned values across the scanning.

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 9 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ani.c b/drivers/net/wireless/ath/ath9k/ani.c
index d969a11e3425..01240d63896e 100644
--- a/drivers/net/wireless/ath/ath9k/ani.c
+++ b/drivers/net/wireless/ath/ath9k/ani.c
@@ -273,7 +273,8 @@ static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel)
                 immunityLevel, aniState->noiseFloor,
                 aniState->rssiThrLow, aniState->rssiThrHigh);
 
-        aniState->ofdmNoiseImmunityLevel = immunityLevel;
+        if (aniState->update_ani)
+                aniState->ofdmNoiseImmunityLevel = immunityLevel;
 
         entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
         entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
@@ -346,7 +347,8 @@ static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel)
             immunityLevel > ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI)
                 immunityLevel = ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI;
 
-        aniState->cckNoiseImmunityLevel = immunityLevel;
+        if (aniState->update_ani)
+                aniState->cckNoiseImmunityLevel = immunityLevel;
 
         entry_ofdm = &ofdm_level_table[aniState->ofdmNoiseImmunityLevel];
         entry_cck = &cck_level_table[aniState->cckNoiseImmunityLevel];
@@ -593,6 +595,7 @@ void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning)
                                 aniState->ofdmNoiseImmunityLevel,
                                 aniState->cckNoiseImmunityLevel);
 
+                        aniState->update_ani = false;
                         ath9k_hw_set_ofdm_nil(ah, ATH9K_ANI_OFDM_DEF_LEVEL);
                         ath9k_hw_set_cck_nil(ah, ATH9K_ANI_CCK_DEF_LEVEL);
                 }
@@ -609,6 +612,7 @@ void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning)
                         aniState->ofdmNoiseImmunityLevel,
                         aniState->cckNoiseImmunityLevel);
 
+                        aniState->update_ani = true;
                         ath9k_hw_set_ofdm_nil(ah,
                                               aniState->ofdmNoiseImmunityLevel);
                         ath9k_hw_set_cck_nil(ah,
@@ -892,6 +896,8 @@ void ath9k_hw_ani_init(struct ath_hw *ah)
                 ani->ofdmWeakSigDetectOff =
                         !ATH9K_ANI_USE_OFDM_WEAK_SIG;
                 ani->cckNoiseImmunityLevel = ATH9K_ANI_CCK_DEF_LEVEL;
+                ani->ofdmNoiseImmunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL;
+                ani->update_ani = false;
         }
 
         /*
diff --git a/drivers/net/wireless/ath/ath9k/ani.h b/drivers/net/wireless/ath/ath9k/ani.h
index a547005572e7..83029d6c7b22 100644
--- a/drivers/net/wireless/ath/ath9k/ani.h
+++ b/drivers/net/wireless/ath/ath9k/ani.h
@@ -122,6 +122,7 @@ struct ar5416AniState {
         u8 firstepLevel;
         u8 ofdmWeakSigDetectOff;
         u8 cckWeakSigThreshold;
+        bool update_ani;
         u32 listenTime;
         int32_t rssiThrLow;
         int32_t rssiThrHigh;