ath5k: use noise calibration from madwifi hal
This updates ath5k to calibrate the noise floor similar to the
way it is done in the madwifi hal and ath9k. Of note:
- we start NF measurement at the same time as AGC calibration,
but do not actually read the value until the periodic (long)
calibration
- we keep a history of the last few values read and write the
median back to the hardware for CCA
- we do not complain if NF calibration isn't complete, instead
we keep the last read value.
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath5k/ath5k.h b/drivers/net/wireless/ath/ath5k/ath5k.h
index 647d826..6a2a967 100644
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -198,6 +198,7 @@
#define AR5K_TUNE_CWMAX_11B 1023
#define AR5K_TUNE_CWMAX_XR 7
#define AR5K_TUNE_NOISE_FLOOR -72
+#define AR5K_TUNE_CCA_MAX_GOOD_VALUE -95
#define AR5K_TUNE_MAX_TXPOWER 63
#define AR5K_TUNE_DEFAULT_TXPOWER 25
#define AR5K_TUNE_TPC_TXPOWER false
@@ -1006,6 +1007,14 @@
} cap_queues;
};
+/* size of noise floor history (keep it a power of two) */
+#define ATH5K_NF_CAL_HIST_MAX 8
+struct ath5k_nfcal_hist
+{
+ s16 index; /* current index into nfval */
+ s16 nfval[ATH5K_NF_CAL_HIST_MAX]; /* last few noise floors */
+};
+
/***************************************\
HARDWARE ABSTRACTION LAYER STRUCTURE
@@ -1112,6 +1121,8 @@
struct ieee80211_channel r_last_channel;
} ah_radar;
+ struct ath5k_nfcal_hist ah_nfcal_hist;
+
/* noise floor from last periodic calibration */
s32 ah_noise_floor;
@@ -1274,8 +1285,10 @@
extern bool ath5k_channel_ok(struct ath5k_hw *ah, u16 freq, unsigned int flags);
extern int ath5k_hw_channel(struct ath5k_hw *ah, struct ieee80211_channel *channel);
/* PHY calibration */
+void ath5k_hw_init_nfcal_hist(struct ath5k_hw *ah);
extern int ath5k_hw_phy_calibrate(struct ath5k_hw *ah, struct ieee80211_channel *channel);
extern int ath5k_hw_noise_floor_calibration(struct ath5k_hw *ah, short freq);
+extern s16 ath5k_hw_get_noise_floor(struct ath5k_hw *ah);
extern void ath5k_hw_calibration_poll(struct ath5k_hw *ah);
/* Spur mitigation */
bool ath5k_hw_chan_has_spur_noise(struct ath5k_hw *ah,