From b90189759a7ff92aa47e8878f6b5a9f868e19895 Mon Sep 17 00:00:00 2001 From: Simon Wunderlich Date: Thu, 23 Mar 2017 14:30:48 +0100 Subject: ath9k: add noise floor override option Introduce a debugfs option to manually override the noise floor, ignoring the automatically tuned noise floor of the driver/hw. In my tests with a AR9580 based module and a tx99 5 MHz interferer, I could tune the noisefloor to -95 dBm or above to allow communication again. The automatic noise floor calibration sometimes could adapt to the situation as well, but not reliably and permanently. I would consider this "feature" experimental and interesting for people debugging the noise floor calibration or other effects of the hardware. Signed-off-by: Simon Wunderlich Signed-off-by: Mathias Kretschmer Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath9k/calib.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'drivers/net/wireless/ath/ath9k/calib.c') diff --git a/drivers/net/wireless/ath/ath9k/calib.c b/drivers/net/wireless/ath/ath9k/calib.c index 0f71146b781d..13ab6bc46775 100644 --- a/drivers/net/wireless/ath/ath9k/calib.c +++ b/drivers/net/wireless/ath/ath9k/calib.c @@ -254,7 +254,9 @@ int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan) if ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan)) continue; - if (h) + if (ah->nf_override) + nfval = ah->nf_override; + else if (h) nfval = h[i].privNF; else nfval = default_nf; @@ -348,6 +350,7 @@ int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan) return 0; } +EXPORT_SYMBOL(ath9k_hw_loadnf); static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf) -- cgit v1.2.3