/* Common calibration code */
-/* We can tune this as we go by monitoring really low values */
-#define ATH9K_NF_TOO_LOW -60
+#define ATH9K_NF_TOO_HIGH -60
static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer)
{
return nfval;
}
-static void ath9k_hw_update_nfcal_hist_buffer(struct ath9k_nfcal_hist *h,
+static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah,
+ struct ath9k_channel *chan)
+{
+ struct ath_nf_limits *limit;
+
+ if (!chan || IS_CHAN_2GHZ(chan))
+ limit = &ah->nf_2g;
+ else
+ limit = &ah->nf_5g;
+
+ return limit;
+}
+
+static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
+ struct ath9k_channel *chan)
+{
+ return ath9k_hw_get_nf_limits(ah, chan)->nominal;
+}
+
+
+static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah,
+ struct ath9k_hw_cal_data *cal,
int16_t *nfarray)
{
+ struct ath_common *common = ath9k_hw_common(ah);
+ struct ath_nf_limits *limit;
+ struct ath9k_nfcal_hist *h;
+ bool high_nf_mid = false;
int i;
+ h = cal->nfCalHist;
+ limit = ath9k_hw_get_nf_limits(ah, ah->curchan);
+
for (i = 0; i < NUM_NF_READINGS; i++) {
h[i].nfCalBuffer[h[i].currIndex] = nfarray[i];
h[i].privNF =
ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer);
}
+
+ if (!h[i].privNF)
+ continue;
+
+ if (h[i].privNF > limit->max) {
+ high_nf_mid = true;
+
+ ath_dbg(common, ATH_DBG_CALIBRATE,
+ "NFmid[%d] (%d) > MAX (%d), %s\n",
+ i, h[i].privNF, limit->max,
+ (cal->nfcal_interference ?
+ "not corrected (due to interference)" :
+ "correcting to MAX"));
+
+ /*
+ * Normally we limit the average noise floor by the
+ * hardware specific maximum here. However if we have
+ * encountered stuck beacons because of interference,
+ * we bypass this limit here in order to better deal
+ * with our environment.
+ */
+ if (!cal->nfcal_interference)
+ h[i].privNF = limit->max;
+ }
}
+
+ /*
+ * If the noise floor seems normal for all chains, assume that
+ * there is no significant interference in the environment anymore.
+ * Re-enable the enforcement of the NF maximum again.
+ */
+ if (!high_nf_mid)
+ cal->nfcal_interference = false;
}
static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah,
ah->cal_samples = 0;
}
-static s16 ath9k_hw_get_default_nf(struct ath_hw *ah,
- struct ath9k_channel *chan)
-{
- struct ath_nf_limits *limit;
-
- if (!chan || IS_CHAN_2GHZ(chan))
- limit = &ah->nf_2g;
- else
- limit = &ah->nf_5g;
-
- return limit->nominal;
-}
-
/* This is done for the currently configured channel */
bool ath9k_hw_reset_calvalid(struct ath_hw *ah)
{
return true;
if (currCal->calState != CAL_DONE) {
- ath_print(common, ATH_DBG_CALIBRATE,
- "Calibration state incorrect, %d\n",
- currCal->calState);
+ ath_dbg(common, ATH_DBG_CALIBRATE,
+ "Calibration state incorrect, %d\n",
+ currCal->calState);
return true;
}
- if (!ath9k_hw_iscal_supported(ah, currCal->calData->calType))
+ if (!(ah->supp_cals & currCal->calData->calType))
return true;
- ath_print(common, ATH_DBG_CALIBRATE,
- "Resetting Cal %d state for channel %u\n",
- currCal->calData->calType, conf->channel->center_freq);
+ ath_dbg(common, ATH_DBG_CALIBRATE,
+ "Resetting Cal %d state for channel %u\n",
+ currCal->calData->calType, conf->channel->center_freq);
ah->caldata->CalValid &= ~currCal->calData->calType;
currCal->calState = CAL_WAITING;
* noisefloor until the next calibration timer.
*/
if (j == 1000) {
- ath_print(common, ATH_DBG_ANY, "Timeout while waiting for nf "
- "to load: AR_PHY_AGC_CONTROL=0x%x\n",
- REG_READ(ah, AR_PHY_AGC_CONTROL));
+ ath_dbg(common, ATH_DBG_ANY,
+ "Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n",
+ REG_READ(ah, AR_PHY_AGC_CONTROL));
return;
}
}
}
REGWRITE_BUFFER_FLUSH(ah);
- DISABLE_REGWRITE_BUFFER(ah);
}
if (!nf[i])
continue;
- ath_print(common, ATH_DBG_CALIBRATE,
- "NF calibrated [%s] [chain %d] is %d\n",
- (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]);
+ ath_dbg(common, ATH_DBG_CALIBRATE,
+ "NF calibrated [%s] [chain %d] is %d\n",
+ (i >= 3 ? "ext" : "ctl"), i % 3, nf[i]);
- if (nf[i] > limit->max) {
- ath_print(common, ATH_DBG_CALIBRATE,
- "NF[%d] (%d) > MAX (%d), correcting to MAX",
- i, nf[i], limit->max);
+ if (nf[i] > ATH9K_NF_TOO_HIGH) {
+ ath_dbg(common, ATH_DBG_CALIBRATE,
+ "NF[%d] (%d) > MAX (%d), correcting to MAX\n",
+ i, nf[i], ATH9K_NF_TOO_HIGH);
nf[i] = limit->max;
} else if (nf[i] < limit->min) {
- ath_print(common, ATH_DBG_CALIBRATE,
- "NF[%d] (%d) < MIN (%d), correcting to NOM",
- i, nf[i], limit->min);
+ ath_dbg(common, ATH_DBG_CALIBRATE,
+ "NF[%d] (%d) < MIN (%d), correcting to NOM\n",
+ i, nf[i], limit->min);
nf[i] = limit->nominal;
}
}
struct ieee80211_channel *c = chan->chan;
struct ath9k_hw_cal_data *caldata = ah->caldata;
- if (!caldata)
- return false;
-
chan->channelFlags &= (~CHANNEL_CW_INT);
if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) {
- ath_print(common, ATH_DBG_CALIBRATE,
- "NF did not complete in calibration window\n");
- nf = 0;
- caldata->rawNoiseFloor = nf;
+ ath_dbg(common, ATH_DBG_CALIBRATE,
+ "NF did not complete in calibration window\n");
+ return false;
+ }
+
+ ath9k_hw_do_getnf(ah, nfarray);
+ ath9k_hw_nf_sanitize(ah, nfarray);
+ nf = nfarray[0];
+ if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
+ && nf > nfThresh) {
+ ath_dbg(common, ATH_DBG_CALIBRATE,
+ "noise floor failed detected; detected %d, threshold %d\n",
+ nf, nfThresh);
+ chan->channelFlags |= CHANNEL_CW_INT;
+ }
+
+ if (!caldata) {
+ chan->noisefloor = nf;
return false;
- } else {
- ath9k_hw_do_getnf(ah, nfarray);
- ath9k_hw_nf_sanitize(ah, nfarray);
- nf = nfarray[0];
- if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh)
- && nf > nfThresh) {
- ath_print(common, ATH_DBG_CALIBRATE,
- "noise floor failed detected; "
- "detected %d, threshold %d\n",
- nf, nfThresh);
- chan->channelFlags |= CHANNEL_CW_INT;
- }
}
h = caldata->nfCalHist;
caldata->nfcal_pending = false;
- ath9k_hw_update_nfcal_hist_buffer(h, nfarray);
- caldata->rawNoiseFloor = h[0].privNF;
+ ath9k_hw_update_nfcal_hist_buffer(ah, caldata, nfarray);
+ chan->noisefloor = h[0].privNF;
return true;
}
s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan)
{
- if (!ah->caldata || !ah->caldata->rawNoiseFloor)
+ if (!ah->curchan || !ah->curchan->noisefloor)
return ath9k_hw_get_default_nf(ah, chan);
- return ah->caldata->rawNoiseFloor;
+ return ah->curchan->noisefloor;
}
EXPORT_SYMBOL(ath9k_hw_getchan_noise);
+
+void ath9k_hw_bstuck_nfcal(struct ath_hw *ah)
+{
+ struct ath9k_hw_cal_data *caldata = ah->caldata;
+
+ if (unlikely(!caldata))
+ return;
+
+ /*
+ * If beacons are stuck, the most likely cause is interference.
+ * Triggering a noise floor calibration at this point helps the
+ * hardware adapt to a noisy environment much faster.
+ * To ensure that we recover from stuck beacons quickly, let
+ * the baseband update the internal NF value itself, similar to
+ * what is being done after a full reset.
+ */
+ if (!caldata->nfcal_pending)
+ ath9k_hw_start_nfcal(ah, true);
+ else if (!(REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF))
+ ath9k_hw_getnf(ah, ah->curchan);
+
+ caldata->nfcal_interference = true;
+}
+EXPORT_SYMBOL(ath9k_hw_bstuck_nfcal);
+
projects / mv-sheeva.git / blobdiff