ath9k_hw: calculate a much better approximation of channel noise

Currently ath9k presents the internal calibrated noise floor as channel
noise measurement, however this results in highly chip specific values
that are only useful as relative measurements but do not resemble any
real channel noise values.

In order to give a much better approximation of the real channel noise,
add the difference between the measured noise floor and the nominal
chip specific noise floor to the default minimum channel noise value,
which is currently used to calculate the signal strength from the RSSI
value. This may not be 100% accurate, but it's much better than what's
there before.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/calib.c b/drivers/net/wireless/ath/ath9k/calib.c
index a1250c586e40..ac2da3cce788 100644
--- a/drivers/net/wireless/ath/ath9k/calib.c
+++ b/drivers/net/wireless/ath/ath9k/calib.c
@@ -63,6 +63,19 @@ static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
 	return ath9k_hw_get_nf_limits(ah, chan)->nominal;
 }
 
+s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
+{
+	s8 noise = ATH_DEFAULT_NOISE_FLOOR;
+
+	if (chan && chan->noisefloor) {
+		s8 delta = chan->noisefloor -
+			   ath9k_hw_get_default_nf(ah, chan);
+		if (delta > 0)
+			noise += delta;
+	}
+	return noise;
+}
+EXPORT_SYMBOL(ath9k_hw_getchan_noise);
 
 static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah,
 					      struct ath9k_hw_cal_data *cal,
@@ -378,6 +391,7 @@ bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan)
 
 	if (!caldata) {
 		chan->noisefloor = nf;
+		ah->noise = ath9k_hw_getchan_noise(ah, chan);
 		return false;
 	}
 
@@ -385,6 +399,7 @@ bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan)
 	caldata->nfcal_pending = false;
 	ath9k_hw_update_nfcal_hist_buffer(ah, caldata, nfarray);
 	chan->noisefloor = h[0].privNF;
+	ah->noise = ath9k_hw_getchan_noise(ah, chan);
 	return true;
 }