ath9k_hw: fix periodic noise floor calibration on AR9003

The periodic noise floor calibration is broken on this chip family, because
it keeps triggering a software-filtered noise floor calibration, but never
reads the result before uploading the history buffer value to the hardware.

Fix this with a call to ath9k_hw_getnf(), just like on AR9002.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Acked-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_calib.c b/drivers/net/wireless/ath/ath9k/ar9003_calib.c
index 938365eebae6..f51ab89c989d 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_calib.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_calib.c
@@ -149,6 +149,12 @@ static bool ar9003_hw_calibrate(struct ath_hw *ah,
         /* Do NF cal only at longer intervals */
         if (longcal) {
                 /*
+                 * Get the value from the previous NF cal and update
+                 * history buffer.
+                 */
+                ath9k_hw_getnf(ah, chan);
+
+                /*
                  * Load the NF from history buffer of the current channel.
                  * NF is slow time-variant, so it is OK to use a historical
                  * value.