| From 6d19cb7b3325e6c460db0f07f178793f4500783a Mon Sep 17 00:00:00 2001 |
| From: Rajkumar Manoharan <rmanohar@qca.qualcomm.com> |
| Date: Thu, 15 Mar 2012 06:08:04 +0530 |
| Subject: ath9k: fix max noise floor threshold |
| |
| From: Rajkumar Manoharan <rmanohar@qca.qualcomm.com> |
| |
| commit 2ee0a07028d2cde6e131b73f029dae2b93c50f3a upstream. |
| |
| Currently the maximum noise floor limit is set as too high (-60dB). The |
| assumption of having a higher threshold limit is that it would help |
| de-sensitize the receiver (reduce phy errors) from continuous |
| interference. But when we have a bursty interference where there are |
| collisions and then free air time and if the receiver is desensitized too |
| much, it will miss the normal packets too. Lets make use of chips |
| specific min, nom and max limits always. This patch helps to improve the |
| connection stability in congested networks. |
| |
| Cc: Paul Stewart <pstew@google.com> |
| Tested-by: Gary Morain <gmorain@google.com> |
| Signed-off-by: Madhan Jaganathan <madhanj@qca.qualcomm.com> |
| Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com> |
| Signed-off-by: John W. Linville <linville@tuxdriver.com> |
| [bwh: Backported to 3.0/3.2: adjust context] |
| Signed-off-by: Ben Hutchings <ben@decadent.org.uk> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| drivers/net/wireless/ath/ath9k/calib.c | 5 ++--- |
| 1 file changed, 2 insertions(+), 3 deletions(-) |
| |
| --- a/drivers/net/wireless/ath/ath9k/calib.c |
| +++ b/drivers/net/wireless/ath/ath9k/calib.c |
| @@ -20,7 +20,6 @@ |
| |
| /* Common calibration code */ |
| |
| -#define ATH9K_NF_TOO_HIGH -60 |
| |
| static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer) |
| { |
| @@ -348,10 +347,10 @@ static void ath9k_hw_nf_sanitize(struct |
| "NF calibrated [%s] [chain %d] is %d\n", |
| (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]); |
| |
| - if (nf[i] > ATH9K_NF_TOO_HIGH) { |
| + if (nf[i] > limit->max) { |
| ath_dbg(common, ATH_DBG_CALIBRATE, |
| "NF[%d] (%d) > MAX (%d), correcting to MAX\n", |
| - i, nf[i], ATH9K_NF_TOO_HIGH); |
| + i, nf[i], limit->max); |
| nf[i] = limit->max; |
| } else if (nf[i] < limit->min) { |
| ath_dbg(common, ATH_DBG_CALIBRATE, |
