ath9k_hw: Fix RTT calibration

This patch fixes multiple issues with the current RTT
implementation in ath9k.

* The data that is obtained from the RTT interface registers
  are stored in 31:5 - mask out the extra bits when reading them.

* A history buffer is maintained which is not needed at all.
  Remove this array and just store the baseband data for each
  chain (or bank).

* A 'num_readings' variable was being used to handle the
  last entry. But it was being used in an improper manner, with
  the result that the RTT values were never being written
  to the RTT Interface registers. Fix this by using a simple
  flag.

* Stop baseband operations before programming the calibration values
  to the HW.

* Do not restore RX gain settings as part of RTT.

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

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index f84477c5ebb..abe05ec85d5 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -1702,10 +1702,10 @@ static int ath9k_hw_do_fastcc(struct ath_hw *ah, struct ath9k_channel *chan)
          * For AR9462, make sure that calibration data for
          * re-using are present.
          */
-        if (AR_SREV_9462(ah) && (!ah->caldata ||
-                                 !ah->caldata->done_txiqcal_once ||
-                                 !ah->caldata->done_txclcal_once ||
-                                 !ah->caldata->rtt_hist.num_readings))
+        if (AR_SREV_9462(ah) && (ah->caldata &&
+                                 (!ah->caldata->done_txiqcal_once ||
+                                  !ah->caldata->done_txclcal_once ||
+                                  !ah->caldata->rtt_done)))
                 goto fail;
 
         ath_dbg(common, RESET, "FastChannelChange for %d -> %d\n",
@@ -1941,7 +1941,6 @@ int ath9k_hw_reset(struct ath_hw *ah, struct ath9k_channel *chan,
         if (caldata) {
                 caldata->done_txiqcal_once = false;
                 caldata->done_txclcal_once = false;
-                caldata->rtt_hist.num_readings = 0;
         }
         if (!ath9k_hw_init_cal(ah, chan))
                 return -EIO;