Re: [4.9.0-rc5] AR9300 calibration problems with antenna selected
From: Kalle Valo
Date: Thu Nov 17 2016 - 06:09:51 EST
> I recently tried to select a single antenna on AR9300 and it works for
> 30 seconds only. The subsequent calibration makes the RX signal level to
> drop from the usual -30/-40 dBm to -70/-80 dBm, and the transmission
> practically stops.
> With the attached patch it works, though selecting the antenna doesn't
> seem to have any visible effect, at least with "iw wlanX station dump"
> (perhaps it works for TX).
> I'm using ad-hoc mode:
> rmmod ath9k
> modprobe ath9k
> iw dev wlan0 set type ibss
> iw phy phyX set antenna 2
> ip link set up dev wlan0
> iw dev wlan0 set bitrates legacy-2.4 18
> iw dev wlan0 ibss join nameXXX freqYYY
> ip addr add ZZZ broadcast + dev wlan0
> The card in question is Mikrotik (Routerboard) R11e-2HPnD mPCIe adapter:
> AR9580 Wireless Network Adapter (rev 01), ID 168c:0033, subsystem
> ieee80211 phy0: Atheros AR9300 Rev:4 mem=0xc0f40000, irq=334
> Linux 4.9.0-rc5.
> Is there a better way?
> Signed-off-by: Krzysztof Halasa <khalasa@xxxxxxx>
> diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
> index e9f32b5..7f17e5d 100644
> --- a/drivers/net/wireless/ath/ath9k/main.c
> +++ b/drivers/net/wireless/ath/ath9k/main.c
> @@ -2245,7 +2245,7 @@ static int ath9k_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
> return 0;
> /* AR9100 runs into calibration issues if not all rx chains are enabled */
> - if (AR_SREV_9100(ah))
> + if (AR_SREV_9100(ah) || AR_SREV_9300(ah))
> ah->rxchainmask = 0x7;
> ah->rxchainmask = fill_chainmask(ah->caps.rx_chainmask, rx_ant);
I'll assume this is an RFC patch. Please resubmit if this is the right
Patch set to RFC.
Documentation about submitting wireless patches and checking status