This is a note to let you know that I've just added the patch titled
ath9k_hw: Fix signal strength / channel noise reporting
to the 3.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ath9k_hw-fix-signal-strength-channel-noise-reporting.patch
and it can be found in the queue-3.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From b7c0c238898d200e80487516e2b67aba2a522cc0 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <[email protected]>
Date: Mon, 10 Dec 2012 14:03:17 +0100
Subject: ath9k_hw: Fix signal strength / channel noise reporting
From: Felix Fietkau <[email protected]>
commit b7c0c238898d200e80487516e2b67aba2a522cc0 upstream.
While AR_PHY_CCA_NOM_VAL_* does contain the expected internal noise floor
for a chip measured in clean air, it refers to the lowest expected reading.
Depending on the frequency, this measurement can vary by about 6db, thus
causing a higher reported channel noise and signal strength.
Factor in the 6db offset when converting internal noisefloor to channel noise.
This patch makes the reported values more accurate for all chips without
affecting NF calibration behavior.
Signed-off-by: Felix Fietkau <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/ath/ath9k/calib.c | 1 +
drivers/net/wireless/ath/ath9k/calib.h | 3 +++
2 files changed, 4 insertions(+)
--- a/drivers/net/wireless/ath/ath9k/calib.c
+++ b/drivers/net/wireless/ath/ath9k/calib.c
@@ -69,6 +69,7 @@ s16 ath9k_hw_getchan_noise(struct ath_hw
if (chan && chan->noisefloor) {
s8 delta = chan->noisefloor -
+ ATH9K_NF_CAL_NOISE_THRESH -
ath9k_hw_get_default_nf(ah, chan);
if (delta > 0)
noise += delta;
--- a/drivers/net/wireless/ath/ath9k/calib.h
+++ b/drivers/net/wireless/ath/ath9k/calib.h
@@ -21,6 +21,9 @@
#define AR_PHY_CCA_FILTERWINDOW_LENGTH 5
+/* Internal noise floor can vary by about 6db depending on the frequency */
+#define ATH9K_NF_CAL_NOISE_THRESH 6
+
#define NUM_NF_READINGS 6
#define ATH9K_NF_CAL_HIST_MAX 5
Patches currently in stable-queue which might be from [email protected] are
queue-3.7/ath9k_hw-fix-signal-strength-channel-noise-reporting.patch
queue-3.7/revert-ath9k_hw-update-ar9003-high_power-tx-gain-table.patch
queue-3.7/ath5k-fix-tx-path-skb-leaks.patch
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