commit a126ff511b12bd0e7b6ca9c16ab3f6f325ba6356
author Rajkumar Manoharan <rmanohar@qca.qualcomm.com> Thu Oct 13 11:00:42 2011 +0530
committer John W. Linville <linville@tuxdriver.com> Fri Oct 14 14:48:23 2011 -0400
tree 934315709161521ed845cc32cfd2df2d1fff6897
parent 324c74ad64c7528a9cf243455723d5ed57238e15

ath9k_hw: Do fast channel change based on reusable calibration results

Support the fast channel change across band switch only when there
are available of reusable cabliration results. And also observed that
doing agc control calibration on fastcc, sometimes causing calibration
timeout. Hence changing agc control to be run only on full chip reset.

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/hw.c

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 0eb0b3b..67831a3 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1445,6 +1445,7 @@
 	ath9k_hw_spur_mitigate_freq(ah, chan);
 
 	if (edma && (band_switch || mode_diff)) {
+		ah->ah_flags |= AH_FASTCC;
 		if (band_switch || ini_reloaded)
 			ah->eep_ops->set_board_values(ah, chan);
 
@@ -1452,6 +1453,7 @@
 
 		if (band_switch || ini_reloaded)
 			ath9k_hw_init_cal(ah, chan);
+		ah->ah_flags &= ~AH_FASTCC;
 	}
 
 	return true;
@@ -1509,6 +1511,7 @@
 	u32 macStaId1;
 	u64 tsf = 0;
 	int i, r;
+	bool allow_fbs = false;
 
 	if (!ath9k_hw_setpower(ah, ATH9K_PM_AWAKE))
 		return -EIO;
@@ -1530,12 +1533,19 @@
 	if (AR_SREV_9280(ah) && common->bus_ops->ath_bus_type == ATH_PCI)
 		bChannelChange = false;
 
+	if (caldata &&
+	    caldata->done_txiqcal_once &&
+	    caldata->done_txclcal_once &&
+	    caldata->rtt_hist.num_readings)
+		allow_fbs = true;
+
 	if (bChannelChange &&
 	    (ah->chip_fullsleep != true) &&
 	    (ah->curchan != NULL) &&
 	    (chan->channel != ah->curchan->channel) &&
-	    ((chan->channelFlags & CHANNEL_ALL) ==
-	     (ah->curchan->channelFlags & CHANNEL_ALL))) {
+	    (allow_fbs ||
+	     ((chan->channelFlags & CHANNEL_ALL) ==
+	      (ah->curchan->channelFlags & CHANNEL_ALL)))) {
 		if (ath9k_hw_channel_change(ah, chan)) {
 			ath9k_hw_loadnf(ah, ah->curchan);
 			ath9k_hw_start_nfcal(ah, true);