ath9k_hw: restrict valid nf readings for AR9271 to -114

Noisefloor values read on AR9271 are unreliable if they
are less than -114, set those statically to -116.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/calib.c b/drivers/net/wireless/ath/ath9k/calib.c
index 0c3e9c8fa017..e76dd7498653 100644
--- a/drivers/net/wireless/ath/ath9k/calib.c
+++ b/drivers/net/wireless/ath/ath9k/calib.c
@@ -101,6 +101,10 @@ static void ath9k_hw_do_getnf(struct ath_hw *ah,
                 nf = 0 - ((nf ^ 0x1ff) + 1);
         ath_print(common, ATH_DBG_CALIBRATE,
                   "NF calibrated [ctl] [chain 0] is %d\n", nf);
+
+        if (AR_SREV_9271(ah) && (nf >= -114))
+                nf = -116;
+
         nfarray[0] = nf;
 
         if (!AR_SREV_9285(ah) && !AR_SREV_9271(ah)) {
@@ -139,6 +143,10 @@ static void ath9k_hw_do_getnf(struct ath_hw *ah,
                 nf = 0 - ((nf ^ 0x1ff) + 1);
         ath_print(common, ATH_DBG_CALIBRATE,
                   "NF calibrated [ext] [chain 0] is %d\n", nf);
+
+        if (AR_SREV_9271(ah) && (nf >= -114))
+                nf = -116;
+
         nfarray[3] = nf;
 
         if (!AR_SREV_9285(ah) && !AR_SREV_9271(ah)) {