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Code Issues Releases Activity

Fix 5ghz calibration logic when using AR9280 w/ fast clock.

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When the fast clock (44mhz) is enabled for 5ghz HT20, the
dual ADCs aren't enabled. Trying to do the ADC calibrations
here would result in calibration never completing; this
resulted in IQ calibration never running and thus performance
issues in 11a/11n HT20 mode.

Leave it enabled for non-fastclock (40mhz) 11a mode and
HT40 modes.

This has been fixed in discussion with Felix Fietkau (nbd)
and discussions with the Atheros baseband team.

Linux ath9k now has a similar fix.

Approved by:	re (kib)
This commit is contained in:
Adrian Chadd 2011-09-06 10:54:56 +00:00
parent d497ffcab4
commit aacc74998a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=225421
1 changed files with 9 additions and 8 deletions
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17
sys/dev/ath/ath_hal/ar5416/ar5416_cal.c
View File

@ -72,16 +72,17 @@ ar5416IsCalSupp(struct ath_hal *ah, const struct ieee80211_channel *chan,
return !IEEE80211_IS_CHAN_B(chan);
case ADC_GAIN_CAL:
case ADC_DC_CAL:
/* Run ADC Gain Cal for either 5ghz any or 2ghz HT40 */
/*
* Merlin (AR9280) doesn't ever complete ADC calibrations
* in 5ghz non-HT40 mode (ie, HT20, 11a). For now, disable
* it for Merlin only until further information is
* available.
* Run ADC Gain Cal for either 5ghz any or 2ghz HT40.
*
* Don't run ADC calibrations for 5ghz fast clock mode
* in HT20 - only one ADC is used.
*/
if (! AR_SREV_MERLIN(ah))
if (IEEE80211_IS_CHAN_5GHZ(chan))
return AH_TRUE;
if (IEEE80211_IS_CHAN_HT20(chan) &&
(IS_5GHZ_FAST_CLOCK_EN(ah, chan)))
return AH_FALSE;
if (IEEE80211_IS_CHAN_5GHZ(chan))
return AH_TRUE;
if (IEEE80211_IS_CHAN_HT40(chan))
return AH_TRUE;
return AH_FALSE;