I noticed while running powertop that I was always seeing wakeups due to ath9k
like so:
2.7% ( 10.0) phy4 : ath9k_bss_info_changed (ath_ani_calibrate)
It struck me as odd that this calibration never completed. This is on an HP
dv5z, the driver reports
[ 12.343107] phy0: Atheros AR9280 MAC/BB Rev:2 AR5133 RF Rev:d0:
mem=0xffffc20005460000, irq=17
I recompiled the module with debugging enabled to see what it was doing, and used
insmod ath9k.ko debug=0x0110
(ANI and CALIBRATION)
It basically looks like short calibration never completes. I added a few more
debug messages as well:
[ 3230.147303] ath9k: Writing ofdmbase=12582412 cckbase=12582712
[ 3230.747582] ath9k: Writing ofdmbase=12582412 cckbase=12582712
[ 3230.946444] ath9k: shortcal @4295846580
[ 3230.946509] ath9k: ah_calSamples: 0, calNumSamples 1
[ 3230.946539] ath9k: ath9k_hw_per_cal: isCalDone: 0
[ 3230.946556] ath9k: calibrate chan 2447/500e0 nf: -115
[ 3231.347291] ath9k: Writing ofdmbase=12582412 cckbase=12582712
[ 3231.946418] ath9k: shortcal @4295846880
[ 3231.946475] ath9k: Writing ofdmbase=12582412 cckbase=12582712
[ 3231.946519] ath9k: ah_calSamples: 0, calNumSamples 1
[ 3231.946542] ath9k: ath9k_hw_per_cal: isCalDone: 0
[ 3231.946557] ath9k: calibrate chan 2447/500e0 nf: -115
[ 3232.546444] ath9k: Writing ofdmbase=12582412 cckbase=12582712
[ 3232.946425] ath9k: shortcal @4295847180
[ 3232.946496] ath9k: ah_calSamples: 0, calNumSamples 1
[ 3232.946519] ath9k: ath9k_hw_per_cal: isCalDone: 0
[ 3232.946535] ath9k: calibrate chan 2447/500e0 nf: -115
[ 3233.146461] ath9k: Writing ofdmbase=12582412 cckbase=12582712
[ 3233.746450] ath9k: Writing ofdmbase=12582412 cckbase=12582712
[ 3233.947255] ath9k: shortcal @4295847480
It seems that in calib.c ath9k_hw_per_calibration() this REG_READ test always
fails:
>>>
*isCalDone = false;
if (currCal->calState == CAL_RUNNING) {
DPRINTF(ah->ah_sc, ATH_DBG_CALIBRATE,
"ah_calSamples: %d, calNumSamples %d\n",
ahp->ah_CalSamples, currCal->calData->calNumSamples);
if (!(REG_READ(ah, AR_PHY_TIMING_CTRL4(0)) &
AR_PHY_TIMING_CTRL4_DO_CAL)) {
currCal->calData->calCollect(ah);
ahp->ah_CalSamples++;
<<<
(I added the DPRINTF there)
How is this intended to work, and why isn't it getting what it wants?
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/