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authorWojciech Dubowik <Wojciech.Dubowik@neratec.com>2018-01-24 09:02:18 +0100
committerKalle Valo <kvalo@codeaurora.org>2018-01-25 07:33:43 +0200
commit8da58553cc63f6e9afcab0db033c79e554334c13 (patch)
tree194ddb074b5e6cf69edbc04e8ffd60f6bbb457ae /drivers/net/wireless/ath
parent34d4fcd8813a990d0afb86893fdd64748adca6cb (diff)
downloadop-kernel-dev-8da58553cc63f6e9afcab0db033c79e554334c13.zip
op-kernel-dev-8da58553cc63f6e9afcab0db033c79e554334c13.tar.gz
ath9k: Use calibrated noise floor value when available
AR9003 series allows to calibrate noise floor for different frequency bins. Once it's done it's possible to get more accurate rssi/signal values over whole frequency band at a given temperature. The RSSI/signal accuracy reported by calibrated RF cards improves from 6 to up to 2dB. This could be interesting for application which require good signal accuracy like roaming or mesh protocols. Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Diffstat (limited to 'drivers/net/wireless/ath')
-rw-r--r--drivers/net/wireless/ath/ath9k/calib.c38
1 files changed, 24 insertions, 14 deletions
diff --git a/drivers/net/wireless/ath/ath9k/calib.c b/drivers/net/wireless/ath/ath9k/calib.c
index 13ab6bc..3d9447e 100644
--- a/drivers/net/wireless/ath/ath9k/calib.c
+++ b/drivers/net/wireless/ath/ath9k/calib.c
@@ -58,19 +58,25 @@ static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah,
}
static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
- struct ath9k_channel *chan)
+ struct ath9k_channel *chan,
+ int chain)
{
- return ath9k_hw_get_nf_limits(ah, chan)->nominal;
+ s16 calib_nf = ath9k_hw_get_nf_limits(ah, chan)->cal[chain];
+
+ if (calib_nf)
+ return calib_nf;
+ else
+ return ath9k_hw_get_nf_limits(ah, chan)->nominal;
}
s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan,
s16 nf)
{
- s8 noise = ATH_DEFAULT_NOISE_FLOOR;
+ s8 noise = ath9k_hw_get_default_nf(ah, chan, 0);
if (nf) {
s8 delta = nf - ATH9K_NF_CAL_NOISE_THRESH -
- ath9k_hw_get_default_nf(ah, chan);
+ ath9k_hw_get_default_nf(ah, chan, 0);
if (delta > 0)
noise += delta;
}
@@ -240,7 +246,7 @@ int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
unsigned i, j;
u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask;
struct ath_common *common = ath9k_hw_common(ah);
- s16 default_nf = ath9k_hw_get_default_nf(ah, chan);
+ s16 default_nf = ath9k_hw_get_nf_limits(ah, chan)->nominal;
u32 bb_agc_ctl = REG_READ(ah, AR_PHY_AGC_CONTROL);
if (ah->caldata)
@@ -258,8 +264,13 @@ int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan)
nfval = ah->nf_override;
else if (h)
nfval = h[i].privNF;
- else
- nfval = default_nf;
+ else {
+ /* Try to get calibrated noise floor value */
+ nfval =
+ ath9k_hw_get_nf_limits(ah, chan)->cal[i];
+ if (nfval > -60 || nfval < -127)
+ nfval = default_nf;
+ }
REG_RMW(ah, ah->nf_regs[i],
(((u32) nfval << 1) & 0x1ff), 0x1ff);
@@ -429,20 +440,19 @@ void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah,
struct ath9k_channel *chan)
{
struct ath9k_nfcal_hist *h;
- s16 default_nf;
- int i, j;
+ int i, j, k = 0;
ah->caldata->channel = chan->channel;
ah->caldata->channelFlags = chan->channelFlags;
h = ah->caldata->nfCalHist;
- default_nf = ath9k_hw_get_default_nf(ah, chan);
for (i = 0; i < NUM_NF_READINGS; i++) {
h[i].currIndex = 0;
- h[i].privNF = default_nf;
+ h[i].privNF = ath9k_hw_get_default_nf(ah, chan, k);
h[i].invalidNFcount = AR_PHY_CCA_FILTERWINDOW_LENGTH;
- for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) {
- h[i].nfCalBuffer[j] = default_nf;
- }
+ for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++)
+ h[i].nfCalBuffer[j] = h[i].privNF;
+ if (++k >= AR5416_MAX_CHAINS)
+ k = 0;
}
}
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