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487 lines
13 KiB
487 lines
13 KiB
/* |
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* Copyright (c) 2008-2011 Atheros Communications Inc. |
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* |
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* Permission to use, copy, modify, and/or distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include "hw.h" |
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#include "hw-ops.h" |
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#include <linux/export.h> |
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/* Common calibration code */ |
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static int16_t ath9k_hw_get_nf_hist_mid(int16_t *nfCalBuffer) |
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{ |
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int16_t nfval; |
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int16_t sort[ATH9K_NF_CAL_HIST_MAX]; |
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int i, j; |
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for (i = 0; i < ATH9K_NF_CAL_HIST_MAX; i++) |
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sort[i] = nfCalBuffer[i]; |
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for (i = 0; i < ATH9K_NF_CAL_HIST_MAX - 1; i++) { |
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for (j = 1; j < ATH9K_NF_CAL_HIST_MAX - i; j++) { |
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if (sort[j] > sort[j - 1]) { |
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nfval = sort[j]; |
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sort[j] = sort[j - 1]; |
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sort[j - 1] = nfval; |
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} |
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} |
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} |
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nfval = sort[(ATH9K_NF_CAL_HIST_MAX - 1) >> 1]; |
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return nfval; |
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} |
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static struct ath_nf_limits *ath9k_hw_get_nf_limits(struct ath_hw *ah, |
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struct ath9k_channel *chan) |
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{ |
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struct ath_nf_limits *limit; |
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if (!chan || IS_CHAN_2GHZ(chan)) |
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limit = &ah->nf_2g; |
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else |
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limit = &ah->nf_5g; |
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return limit; |
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} |
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static s16 ath9k_hw_get_default_nf(struct ath_hw *ah, |
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struct ath9k_channel *chan, |
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int chain) |
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{ |
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s16 calib_nf = ath9k_hw_get_nf_limits(ah, chan)->cal[chain]; |
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if (calib_nf) |
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return calib_nf; |
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else |
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return ath9k_hw_get_nf_limits(ah, chan)->nominal; |
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} |
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s16 ath9k_hw_getchan_noise(struct ath_hw *ah, struct ath9k_channel *chan, |
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s16 nf) |
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{ |
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s8 noise = ATH_DEFAULT_NOISE_FLOOR; |
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if (nf) { |
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s8 delta = nf - ATH9K_NF_CAL_NOISE_THRESH - |
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ath9k_hw_get_default_nf(ah, chan, 0); |
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if (delta > 0) |
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noise += delta; |
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} |
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return noise; |
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} |
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EXPORT_SYMBOL(ath9k_hw_getchan_noise); |
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static void ath9k_hw_update_nfcal_hist_buffer(struct ath_hw *ah, |
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struct ath9k_hw_cal_data *cal, |
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int16_t *nfarray) |
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{ |
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struct ath_common *common = ath9k_hw_common(ah); |
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struct ath_nf_limits *limit; |
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struct ath9k_nfcal_hist *h; |
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bool high_nf_mid = false; |
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u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask; |
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int i; |
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h = cal->nfCalHist; |
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limit = ath9k_hw_get_nf_limits(ah, ah->curchan); |
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for (i = 0; i < NUM_NF_READINGS; i++) { |
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if (!(chainmask & (1 << i)) || |
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((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(ah->curchan))) |
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continue; |
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h[i].nfCalBuffer[h[i].currIndex] = nfarray[i]; |
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if (++h[i].currIndex >= ATH9K_NF_CAL_HIST_MAX) |
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h[i].currIndex = 0; |
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if (h[i].invalidNFcount > 0) { |
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h[i].invalidNFcount--; |
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h[i].privNF = nfarray[i]; |
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} else { |
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h[i].privNF = |
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ath9k_hw_get_nf_hist_mid(h[i].nfCalBuffer); |
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} |
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if (!h[i].privNF) |
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continue; |
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if (h[i].privNF > limit->max) { |
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high_nf_mid = true; |
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ath_dbg(common, CALIBRATE, |
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"NFmid[%d] (%d) > MAX (%d), %s\n", |
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i, h[i].privNF, limit->max, |
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(test_bit(NFCAL_INTF, &cal->cal_flags) ? |
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"not corrected (due to interference)" : |
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"correcting to MAX")); |
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/* |
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* Normally we limit the average noise floor by the |
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* hardware specific maximum here. However if we have |
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* encountered stuck beacons because of interference, |
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* we bypass this limit here in order to better deal |
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* with our environment. |
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*/ |
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if (!test_bit(NFCAL_INTF, &cal->cal_flags)) |
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h[i].privNF = limit->max; |
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} |
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} |
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/* |
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* If the noise floor seems normal for all chains, assume that |
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* there is no significant interference in the environment anymore. |
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* Re-enable the enforcement of the NF maximum again. |
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*/ |
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if (!high_nf_mid) |
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clear_bit(NFCAL_INTF, &cal->cal_flags); |
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} |
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static bool ath9k_hw_get_nf_thresh(struct ath_hw *ah, |
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enum nl80211_band band, |
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int16_t *nft) |
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{ |
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switch (band) { |
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case NL80211_BAND_5GHZ: |
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*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_5); |
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break; |
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case NL80211_BAND_2GHZ: |
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*nft = (int8_t)ah->eep_ops->get_eeprom(ah, EEP_NFTHRESH_2); |
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break; |
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default: |
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BUG_ON(1); |
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return false; |
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} |
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return true; |
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} |
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void ath9k_hw_reset_calibration(struct ath_hw *ah, |
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struct ath9k_cal_list *currCal) |
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{ |
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int i; |
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ath9k_hw_setup_calibration(ah, currCal); |
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ah->cal_start_time = jiffies; |
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currCal->calState = CAL_RUNNING; |
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for (i = 0; i < AR5416_MAX_CHAINS; i++) { |
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ah->meas0.sign[i] = 0; |
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ah->meas1.sign[i] = 0; |
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ah->meas2.sign[i] = 0; |
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ah->meas3.sign[i] = 0; |
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} |
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ah->cal_samples = 0; |
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} |
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/* This is done for the currently configured channel */ |
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bool ath9k_hw_reset_calvalid(struct ath_hw *ah) |
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{ |
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struct ath_common *common = ath9k_hw_common(ah); |
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struct ath9k_cal_list *currCal = ah->cal_list_curr; |
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if (!ah->caldata) |
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return true; |
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if (!AR_SREV_9100(ah) && !AR_SREV_9160_10_OR_LATER(ah)) |
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return true; |
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if (currCal == NULL) |
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return true; |
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if (currCal->calState != CAL_DONE) { |
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ath_dbg(common, CALIBRATE, "Calibration state incorrect, %d\n", |
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currCal->calState); |
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return true; |
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} |
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currCal = ah->cal_list; |
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do { |
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ath_dbg(common, CALIBRATE, "Resetting Cal %d state for channel %u\n", |
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currCal->calData->calType, |
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ah->curchan->chan->center_freq); |
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ah->caldata->CalValid &= ~currCal->calData->calType; |
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currCal->calState = CAL_WAITING; |
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currCal = currCal->calNext; |
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} while (currCal != ah->cal_list); |
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return false; |
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} |
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EXPORT_SYMBOL(ath9k_hw_reset_calvalid); |
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void ath9k_hw_start_nfcal(struct ath_hw *ah, bool update) |
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{ |
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if (ah->caldata) |
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set_bit(NFCAL_PENDING, &ah->caldata->cal_flags); |
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, |
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AR_PHY_AGC_CONTROL_ENABLE_NF); |
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if (update) |
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REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, |
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AR_PHY_AGC_CONTROL_NO_UPDATE_NF); |
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else |
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, |
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AR_PHY_AGC_CONTROL_NO_UPDATE_NF); |
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); |
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} |
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int ath9k_hw_loadnf(struct ath_hw *ah, struct ath9k_channel *chan) |
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{ |
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struct ath9k_nfcal_hist *h = NULL; |
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unsigned i, j; |
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u8 chainmask = (ah->rxchainmask << 3) | ah->rxchainmask; |
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struct ath_common *common = ath9k_hw_common(ah); |
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s16 default_nf = ath9k_hw_get_nf_limits(ah, chan)->nominal; |
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u32 bb_agc_ctl = REG_READ(ah, AR_PHY_AGC_CONTROL); |
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if (ah->caldata) |
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h = ah->caldata->nfCalHist; |
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ENABLE_REG_RMW_BUFFER(ah); |
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for (i = 0; i < NUM_NF_READINGS; i++) { |
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if (chainmask & (1 << i)) { |
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s16 nfval; |
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if ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan)) |
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continue; |
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if (ah->nf_override) |
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nfval = ah->nf_override; |
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else if (h) |
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nfval = h[i].privNF; |
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else { |
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/* Try to get calibrated noise floor value */ |
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nfval = |
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ath9k_hw_get_nf_limits(ah, chan)->cal[i]; |
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if (nfval > -60 || nfval < -127) |
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nfval = default_nf; |
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} |
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REG_RMW(ah, ah->nf_regs[i], |
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(((u32) nfval << 1) & 0x1ff), 0x1ff); |
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} |
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} |
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/* |
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* stop NF cal if ongoing to ensure NF load completes immediately |
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* (or after end rx/tx frame if ongoing) |
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*/ |
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if (bb_agc_ctl & AR_PHY_AGC_CONTROL_NF) { |
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REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); |
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REG_RMW_BUFFER_FLUSH(ah); |
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ENABLE_REG_RMW_BUFFER(ah); |
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} |
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/* |
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* Load software filtered NF value into baseband internal minCCApwr |
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* variable. |
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*/ |
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REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, |
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AR_PHY_AGC_CONTROL_ENABLE_NF); |
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REG_CLR_BIT(ah, AR_PHY_AGC_CONTROL, |
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AR_PHY_AGC_CONTROL_NO_UPDATE_NF); |
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); |
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REG_RMW_BUFFER_FLUSH(ah); |
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/* |
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* Wait for load to complete, should be fast, a few 10s of us. |
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* The max delay was changed from an original 250us to 22.2 msec. |
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* This would increase timeout to the longest possible frame |
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* (11n max length 22.1 msec) |
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*/ |
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for (j = 0; j < 22200; j++) { |
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if ((REG_READ(ah, AR_PHY_AGC_CONTROL) & |
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AR_PHY_AGC_CONTROL_NF) == 0) |
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break; |
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udelay(10); |
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} |
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/* |
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* Restart NF so it can continue. |
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*/ |
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if (bb_agc_ctl & AR_PHY_AGC_CONTROL_NF) { |
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ENABLE_REG_RMW_BUFFER(ah); |
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if (bb_agc_ctl & AR_PHY_AGC_CONTROL_ENABLE_NF) |
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, |
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AR_PHY_AGC_CONTROL_ENABLE_NF); |
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if (bb_agc_ctl & AR_PHY_AGC_CONTROL_NO_UPDATE_NF) |
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, |
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AR_PHY_AGC_CONTROL_NO_UPDATE_NF); |
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REG_SET_BIT(ah, AR_PHY_AGC_CONTROL, AR_PHY_AGC_CONTROL_NF); |
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REG_RMW_BUFFER_FLUSH(ah); |
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} |
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/* |
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* We timed out waiting for the noisefloor to load, probably due to an |
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* in-progress rx. Simply return here and allow the load plenty of time |
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* to complete before the next calibration interval. We need to avoid |
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* trying to load -50 (which happens below) while the previous load is |
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* still in progress as this can cause rx deafness. Instead by returning |
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* here, the baseband nf cal will just be capped by our present |
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* noisefloor until the next calibration timer. |
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*/ |
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if (j == 22200) { |
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ath_dbg(common, ANY, |
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"Timeout while waiting for nf to load: AR_PHY_AGC_CONTROL=0x%x\n", |
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REG_READ(ah, AR_PHY_AGC_CONTROL)); |
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return -ETIMEDOUT; |
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} |
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/* |
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* Restore maxCCAPower register parameter again so that we're not capped |
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* by the median we just loaded. This will be initial (and max) value |
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* of next noise floor calibration the baseband does. |
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*/ |
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ENABLE_REG_RMW_BUFFER(ah); |
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for (i = 0; i < NUM_NF_READINGS; i++) { |
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if (chainmask & (1 << i)) { |
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if ((i >= AR5416_MAX_CHAINS) && !IS_CHAN_HT40(chan)) |
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continue; |
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REG_RMW(ah, ah->nf_regs[i], |
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(((u32) (-50) << 1) & 0x1ff), 0x1ff); |
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} |
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} |
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REG_RMW_BUFFER_FLUSH(ah); |
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return 0; |
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} |
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EXPORT_SYMBOL(ath9k_hw_loadnf); |
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static void ath9k_hw_nf_sanitize(struct ath_hw *ah, s16 *nf) |
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{ |
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struct ath_common *common = ath9k_hw_common(ah); |
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struct ath_nf_limits *limit; |
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int i; |
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if (IS_CHAN_2GHZ(ah->curchan)) |
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limit = &ah->nf_2g; |
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else |
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limit = &ah->nf_5g; |
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for (i = 0; i < NUM_NF_READINGS; i++) { |
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if (!nf[i]) |
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continue; |
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ath_dbg(common, CALIBRATE, |
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"NF calibrated [%s] [chain %d] is %d\n", |
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(i >= 3 ? "ext" : "ctl"), i % 3, nf[i]); |
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if (nf[i] > limit->max) { |
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ath_dbg(common, CALIBRATE, |
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"NF[%d] (%d) > MAX (%d), correcting to MAX\n", |
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i, nf[i], limit->max); |
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nf[i] = limit->max; |
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} else if (nf[i] < limit->min) { |
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ath_dbg(common, CALIBRATE, |
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"NF[%d] (%d) < MIN (%d), correcting to NOM\n", |
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i, nf[i], limit->min); |
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nf[i] = limit->nominal; |
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} |
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} |
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} |
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bool ath9k_hw_getnf(struct ath_hw *ah, struct ath9k_channel *chan) |
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{ |
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struct ath_common *common = ath9k_hw_common(ah); |
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int16_t nf, nfThresh; |
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int16_t nfarray[NUM_NF_READINGS] = { 0 }; |
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struct ath9k_nfcal_hist *h; |
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struct ieee80211_channel *c = chan->chan; |
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struct ath9k_hw_cal_data *caldata = ah->caldata; |
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if (REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF) { |
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ath_dbg(common, CALIBRATE, |
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"NF did not complete in calibration window\n"); |
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return false; |
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} |
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ath9k_hw_do_getnf(ah, nfarray); |
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ath9k_hw_nf_sanitize(ah, nfarray); |
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nf = nfarray[0]; |
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if (ath9k_hw_get_nf_thresh(ah, c->band, &nfThresh) |
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&& nf > nfThresh) { |
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ath_dbg(common, CALIBRATE, |
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"noise floor failed detected; detected %d, threshold %d\n", |
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nf, nfThresh); |
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} |
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if (!caldata) { |
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chan->noisefloor = nf; |
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return false; |
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} |
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h = caldata->nfCalHist; |
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clear_bit(NFCAL_PENDING, &caldata->cal_flags); |
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ath9k_hw_update_nfcal_hist_buffer(ah, caldata, nfarray); |
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chan->noisefloor = h[0].privNF; |
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ah->noise = ath9k_hw_getchan_noise(ah, chan, chan->noisefloor); |
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return true; |
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} |
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EXPORT_SYMBOL(ath9k_hw_getnf); |
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void ath9k_init_nfcal_hist_buffer(struct ath_hw *ah, |
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struct ath9k_channel *chan) |
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{ |
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struct ath9k_nfcal_hist *h; |
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int i, j, k = 0; |
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ah->caldata->channel = chan->channel; |
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ah->caldata->channelFlags = chan->channelFlags; |
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h = ah->caldata->nfCalHist; |
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for (i = 0; i < NUM_NF_READINGS; i++) { |
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h[i].currIndex = 0; |
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h[i].privNF = ath9k_hw_get_default_nf(ah, chan, k); |
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h[i].invalidNFcount = AR_PHY_CCA_FILTERWINDOW_LENGTH; |
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for (j = 0; j < ATH9K_NF_CAL_HIST_MAX; j++) |
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h[i].nfCalBuffer[j] = h[i].privNF; |
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if (++k >= AR5416_MAX_CHAINS) |
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k = 0; |
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} |
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} |
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void ath9k_hw_bstuck_nfcal(struct ath_hw *ah) |
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{ |
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struct ath9k_hw_cal_data *caldata = ah->caldata; |
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|
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if (unlikely(!caldata)) |
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return; |
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/* |
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* If beacons are stuck, the most likely cause is interference. |
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* Triggering a noise floor calibration at this point helps the |
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* hardware adapt to a noisy environment much faster. |
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* To ensure that we recover from stuck beacons quickly, let |
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* the baseband update the internal NF value itself, similar to |
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* what is being done after a full reset. |
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*/ |
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if (!test_bit(NFCAL_PENDING, &caldata->cal_flags)) |
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ath9k_hw_start_nfcal(ah, true); |
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else if (!(REG_READ(ah, AR_PHY_AGC_CONTROL) & AR_PHY_AGC_CONTROL_NF)) |
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ath9k_hw_getnf(ah, ah->curchan); |
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set_bit(NFCAL_INTF, &caldata->cal_flags); |
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} |
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EXPORT_SYMBOL(ath9k_hw_bstuck_nfcal); |
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