Commit 598cdd52 authored by Felix Fietkau's avatar Felix Fietkau Committed by John W. Linville
Browse files

ath9k_hw: force rx chainmask to 7 on AR9100

Most AR9100 devices already have a chainmask of 7 (three antennas), however
on the ones that don't (rx and tx chainmask set to 5), problems with IQ
mismatch calibration have been observed.
This shows up as tx queue hangs (and subsequent hardware resets) if traffic
is sent during this type of calibration.
Forcing the rx chainmask to 7 fixes the calibration issues with no apparent
negative side effects on throughput and stability.
Signed-off-by: default avatarFelix Fietkau <>
Signed-off-by: default avatarJohn W. Linville <>
parent f171760c
......@@ -1869,6 +1869,8 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
/* CB71: GPIO 0 is pulled down to indicate 3 rx chains */
pCap->rx_chainmask = ath9k_hw_gpio_get(ah, 0) ? 0x5 : 0x7;
else if (AR_SREV_9100(ah))
pCap->rx_chainmask = 0x7;
/* Use rx_chainmask from EEPROM. */
pCap->rx_chainmask = ah->eep_ops->get_eeprom(ah, EEP_RX_MASK);
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment