Received-SPF: pass (google.com: domain of linux-wireless-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Sergey Ryazanov <ryazanov.s.a@gmail.com>
To:     Kalle Valo <kvalo@codeaurora.org>
Cc:     QCA ath9k Development <ath9k-devel@qca.qualcomm.com>,
        linux-wireless@vger.kernel.org
Subject: [PATCH 4/6] ath9k: interleaved NF calibration on AR9002
Date:   Fri, 24 Apr 2020 03:49:21 +0300
Message-Id: <20200424004923.17129-5-ryazanov.s.a@gmail.com>
In-Reply-To: <20200424004923.17129-1-ryazanov.s.a@gmail.com>
References: <20200424004923.17129-1-ryazanov.s.a@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-wireless-owner@vger.kernel.org
Precedence: bulk

NF calibration and other elements of long calibration are usually faster
than ADCs & I/Q calibrations due to independence of receiption of the
OFDM signal. Moreover sometime I/Q calibration can not be completed at
all without preceding NF calibration. This is due to AGC, which has a
habit to block a weak signal without regular NF calibration. Thus, we do
not need to deferr the long calibration forever.

So, if the long calibration is requested, then deferr the ADCs & I/Q
calibration(s) and run the longcal (the NF calibration in particular) to
obtain fresh noise data.

Run tested with AR9220.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
---
 drivers/net/wireless/ath/ath9k/ar9002_calib.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/ar9002_calib.c b/drivers/net/wireless/ath/ath9k/ar9002_calib.c
index ad8db7720993..68188f500949 100644
--- a/drivers/net/wireless/ath/ath9k/ar9002_calib.c
+++ b/drivers/net/wireless/ath/ath9k/ar9002_calib.c
@@ -680,8 +680,12 @@ static int ar9002_hw_calibrate(struct ath_hw *ah, struct ath9k_channel *chan,
 			return 0;
 
 		ah->cal_list_curr = currCal = currCal->calNext;
-		if (currCal->calState == CAL_WAITING)
-			ath9k_hw_reset_calibration(ah, currCal);
+		percal_pending = currCal->calState == CAL_WAITING;
+	}
+
+	/* Do not start a next calibration if the longcal is in action */
+	if (percal_pending && !nfcal && !longcal) {
+		ath9k_hw_reset_calibration(ah, currCal);
 
 		return 0;
 	}
-- 
2.24.1