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ath9k_hw: do PA offset calibration only on longcal interval

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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).

Cc: stable@kernel.org
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: Rajkumar Manoharan <rmanoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Rajkumar Manoharan 2011-01-17 15:21:40 +05:30 committed by John W. Linville
parent dc738cb6c5
commit 811ea256b3
1 changed files with 5 additions and 5 deletions
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10
drivers/net/wireless/ath/ath9k/ar9002_calib.c
View file

@ -679,10 +679,6 @@ static bool ar9002_hw_calibrate(struct ath_hw *ah,
/* Do NF cal only at longer intervals */ /* Do NF cal only at longer intervals */
if (longcal || nfcal_pending) { 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 * Get the value from the previous NF cal and update
* history buffer. * history buffer.
@ -697,8 +693,12 @@ static bool ar9002_hw_calibrate(struct ath_hw *ah,
ath9k_hw_loadnf(ah, ah->curchan); ath9k_hw_loadnf(ah, ah->curchan);
} }
if (longcal) if (longcal) {
ath9k_hw_start_nfcal(ah, false); ath9k_hw_start_nfcal(ah, false);
/* Do periodic PAOffset Cal */
ar9002_hw_pa_cal(ah, false);
ar9002_hw_olc_temp_compensation(ah);
}
} }
return iscaldone; return iscaldone;