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: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 175c36f3fdac944772f56c74d4ea386967d1cdac..8b8656898dfeb6e79b93f23bef421c78b2fa9215 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1869,6 +1869,8 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
            !(AR_SREV_9271(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;
        else
                /* Use rx_chainmask from EEPROM. */
                pCap->rx_chainmask = ah->eep_ops->get_eeprom(ah, EEP_RX_MASK);