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>

diff --git a/drivers/net/wireless/ath/ath9k/ani.c b/drivers/net/wireless/ath/ath9k/ani.c
index d969a11..01240d6 100644 (file)
--- 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 a547005..83029d6 100644 (file)
--- 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;