This is a note to let you know that I've just added the patch titled
ath9k_hw: do PA offset calibration only on longcal interval
to the 2.6.36-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-do-pa-offset-calibration-only-on-longcal-interval.patch
and it can be found in the queue-2.6.36 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 811ea256b30b37091b5bbf41517404cf98ab56c1 Mon Sep 17 00:00:00 2001
From: Rajkumar Manoharan <[email protected]>
Date: Mon, 17 Jan 2011 15:21:40 +0530
Subject: ath9k_hw: do PA offset calibration only on longcal interval
From: Rajkumar Manoharan <[email protected]>
commit 811ea256b30b37091b5bbf41517404cf98ab56c1 upstream.
The power detector adc offset calibration has to be done
on 4 minutes interval (longcal * pa_skip_count). But the commit
"ath9k_hw: fix a noise floor calibration related race condition"
makes the PA calibration executed more frequently beased on
nfcal_pending value. Running PAOffset calibration lesser than
longcal interval doesn't help anything and the worse part is that
it causes NF load timeouts and RX deaf conditions.
In a very noisy environment, where the distance b/w AP & station
is ~10 meter and running a downlink udp traffic with frequent
background scan causes "Timeout while waiting for nf to load:
AR_PHY_AGC_CONTROL=0x40d1a" and moves the chip into deaf state.
This issue was originaly reported in Android platform where
the network-manager application does bgscan more frequently
on AR9271 chips. (AR9285 family usb device).
Signed-off-by: Vasanthakumar Thiagarajan <[email protected]>
Signed-off-by: Rajkumar Manoharan <[email protected]>
Signed-off-by: John W. Linville <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/wireless/ath/ath9k/ar9002_calib.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/drivers/net/wireless/ath/ath9k/ar9002_calib.c
+++ b/drivers/net/wireless/ath/ath9k/ar9002_calib.c
@@ -710,10 +710,6 @@ static bool ar9002_hw_calibrate(struct a
/* Do NF cal only at longer intervals */
if (longcal || nfcal_pending) {
- /* Do periodic PAOffset Cal */
- ar9002_hw_pa_cal(ah, false);
- ar9002_hw_olc_temp_compensation(ah);
-
/*
* Get the value from the previous NF cal and update
* history buffer.
@@ -728,8 +724,12 @@ static bool ar9002_hw_calibrate(struct a
ath9k_hw_loadnf(ah, ah->curchan);
}
- if (longcal)
+ if (longcal) {
ath9k_hw_start_nfcal(ah, false);
+ /* Do periodic PAOffset Cal */
+ ar9002_hw_pa_cal(ah, false);
+ ar9002_hw_olc_temp_compensation(ah);
+ }
}
return iscaldone;
Patches currently in stable-queue which might be from [email protected] are
queue-2.6.36/ath9k_hw-do-pa-offset-calibration-only-on-longcal-interval.patch
queue-2.6.36/ath9k-fix-beacon-restart-on-channel-change.patch
queue-2.6.36/ath9k_hw-fix-system-hang-when-resuming-from-s3-s4.patch
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