ath9k: enable ANI to help with noisy environments

[linux-2.6-microblaze.git] / drivers / net / wireless / ath9k / hw.c

diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index 272c758..62e44a0 100644 (file)
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -329,7 +329,7 @@ static void ath9k_hw_set_defaults(struct ath_hal *ah)
        ah->ah_config.ofdm_trig_high = 500;
        ah->ah_config.cck_trig_high = 200;
        ah->ah_config.cck_trig_low = 100;
-       ah->ah_config.enable_ani = 0;
+       ah->ah_config.enable_ani = 1;
        ah->ah_config.noise_immunity_level = 4;
        ah->ah_config.ofdm_weaksignal_det = 1;
        ah->ah_config.cck_weaksignal_thr = 0;
@@ -8405,23 +8405,48 @@ u32 ath9k_hw_mhz2ieee(struct ath_hal *ah, u32 freq, u32 flags)
        }
 }
 
-int16_t
+/* We can tune this as we go by monitoring really low values */
+#define ATH9K_NF_TOO_LOW       -60
+
+/* AR5416 may return very high value (like -31 dBm), in those cases the nf
+ * is incorrect and we should use the static NF value. Later we can try to
+ * find out why they are reporting these values */
+static bool ath9k_hw_nf_in_range(struct ath_hal *ah, s16 nf)
+{
+       if (nf > ATH9K_NF_TOO_LOW) {
+               DPRINTF(ah->ah_sc, ATH_DBG_NF_CAL,
+                        "%s: noise floor value detected (%d) is "
+                       "lower than what we think is a "
+                       "reasonable value (%d)\n",
+                        __func__, nf, ATH9K_NF_TOO_LOW);
+               return false;
+       }
+       return true;
+}
+
+s16
 ath9k_hw_getchan_noise(struct ath_hal *ah, struct ath9k_channel *chan)
 {
        struct ath9k_channel *ichan;
+       s16 nf;
 
        ichan = ath9k_regd_check_channel(ah, chan);
        if (ichan == NULL) {
                DPRINTF(ah->ah_sc, ATH_DBG_NF_CAL,
                         "%s: invalid channel %u/0x%x; no mapping\n",
                         __func__, chan->channel, chan->channelFlags);
-               return 0;
+               return ATH_DEFAULT_NOISE_FLOOR;
        }
        if (ichan->rawNoiseFloor == 0) {
                enum wireless_mode mode = ath9k_hw_chan2wmode(ah, chan);
-               return NOISE_FLOOR[mode];
+               nf = NOISE_FLOOR[mode];
        } else
-               return ichan->rawNoiseFloor;
+               nf = ichan->rawNoiseFloor;
+
+       if (!ath9k_hw_nf_in_range(ah, nf))
+               nf = ATH_DEFAULT_NOISE_FLOOR;
+
+       return nf;
 }
 
 bool ath9k_hw_set_tsfadjust(struct ath_hal *ah, u32 setting)