r8180_dm.c

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#include "r8180_dm.h"
#include "r8180_hw.h"
#include "r8180_93cx6.h"

 /* Return TRUE if we shall perform High Power Mechanism, FALSE otherwise. */
#define RATE_ADAPTIVE_TIMER_PERIOD      300

bool CheckHighPower(struct net_device *dev)
{
    struct r8180_priv *priv = ieee80211_priv(dev);
    struct ieee80211_device *ieee = priv->ieee80211;

    if(!priv->bRegHighPowerMechanism)
        return false;

    if(ieee->state == IEEE80211_LINKED_SCANNING)
        return false;

    return true;
}

/*
 *  Description:
 *      Update Tx power level if necessary.
 *      See also DoRxHighPower() and SetTxPowerLevel8185() for reference.
 *
 *  Note:
 *      The reason why we udpate Tx power level here instead of DoRxHighPower()
 *      is the number of IO to change Tx power is much more than channel TR switch
 *      and they are related to OFDM and MAC registers.
 *      So, we don't want to update it so frequently in per-Rx packet base.
 */
void DoTxHighPower(struct net_device *dev)
{
    struct r8180_priv *priv = ieee80211_priv(dev);
    u16         HiPwrUpperTh = 0;
    u16         HiPwrLowerTh = 0;
    u8          RSSIHiPwrUpperTh;
    u8          RSSIHiPwrLowerTh;
    u8          u1bTmp;
    char            OfdmTxPwrIdx, CckTxPwrIdx;

    HiPwrUpperTh = priv->RegHiPwrUpperTh;
    HiPwrLowerTh = priv->RegHiPwrLowerTh;

    HiPwrUpperTh = HiPwrUpperTh * 10;
    HiPwrLowerTh = HiPwrLowerTh * 10;
    RSSIHiPwrUpperTh = priv->RegRSSIHiPwrUpperTh;
    RSSIHiPwrLowerTh = priv->RegRSSIHiPwrLowerTh;

    /* lzm add 080826 */
    OfdmTxPwrIdx  = priv->chtxpwr_ofdm[priv->ieee80211->current_network.channel];
    CckTxPwrIdx  = priv->chtxpwr[priv->ieee80211->current_network.channel];

    if ((priv->UndecoratedSmoothedSS > HiPwrUpperTh) ||
        (priv->bCurCCKPkt && (priv->CurCCKRSSI > RSSIHiPwrUpperTh))) {
        /* Stevenl suggested that degrade 8dbm in high power sate. 2007-12-04 Isaiah */

        priv->bToUpdateTxPwr = true;
        u1bTmp= read_nic_byte(dev, CCK_TXAGC);

        /* If it never enter High Power. */
        if (CckTxPwrIdx == u1bTmp) {
            u1bTmp = (u1bTmp > 16) ? (u1bTmp -16): 0;  /* 8dbm */
            write_nic_byte(dev, CCK_TXAGC, u1bTmp);

            u1bTmp= read_nic_byte(dev, OFDM_TXAGC);
            u1bTmp = (u1bTmp > 16) ? (u1bTmp -16): 0;  /* 8dbm */
            write_nic_byte(dev, OFDM_TXAGC, u1bTmp);
        }

    } else if ((priv->UndecoratedSmoothedSS < HiPwrLowerTh) &&
        (!priv->bCurCCKPkt || priv->CurCCKRSSI < RSSIHiPwrLowerTh)) {
        if (priv->bToUpdateTxPwr) {
            priv->bToUpdateTxPwr = false;
            /* SD3 required. */
            u1bTmp= read_nic_byte(dev, CCK_TXAGC);
            if (u1bTmp < CckTxPwrIdx) {
                write_nic_byte(dev, CCK_TXAGC, CckTxPwrIdx);
            }

            u1bTmp= read_nic_byte(dev, OFDM_TXAGC);
            if (u1bTmp < OfdmTxPwrIdx) {
                write_nic_byte(dev, OFDM_TXAGC, OfdmTxPwrIdx);
            }
        }
    }
}


/*
 *  Description:
 *      Callback function of UpdateTxPowerWorkItem.
 *      Because of some event happened, e.g. CCX TPC, High Power Mechanism,
 *      We update Tx power of current channel again.
 */
void rtl8180_tx_pw_wq(struct work_struct *work)
{
    struct delayed_work *dwork = to_delayed_work(work);
    struct ieee80211_device *ieee = container_of(dwork,struct ieee80211_device,tx_pw_wq);
    struct net_device *dev = ieee->dev;

    DoTxHighPower(dev);
}


/*
 *  Return TRUE if we shall perform DIG Mechanism, FALSE otherwise.
 */
bool CheckDig(struct net_device *dev)
{
    struct r8180_priv *priv = ieee80211_priv(dev);
    struct ieee80211_device *ieee = priv->ieee80211;

    if (!priv->bDigMechanism)
        return false;

    if (ieee->state != IEEE80211_LINKED)
        return false;

    if ((priv->ieee80211->rate / 5) < 36) /* Schedule Dig under all OFDM rates. By Bruce, 2007-06-01. */
        return false;
    return true;
}
/*
 *  Implementation of DIG for Zebra and Zebra2.
 */
void DIG_Zebra(struct net_device *dev)
{
    struct r8180_priv *priv = ieee80211_priv(dev);
    u16         CCKFalseAlarm, OFDMFalseAlarm;
    u16         OfdmFA1, OfdmFA2;
    int         InitialGainStep = 7; /* The number of initial gain stages. */
    int         LowestGainStage = 4; /* The capable lowest stage of performing dig workitem. */
    u32         AwakePeriodIn2Sec = 0;

    CCKFalseAlarm = (u16)(priv->FalseAlarmRegValue & 0x0000ffff);
    OFDMFalseAlarm = (u16)((priv->FalseAlarmRegValue >> 16) & 0x0000ffff);
    OfdmFA1 =  0x15;
    OfdmFA2 = ((u16)(priv->RegDigOfdmFaUpTh)) << 8;

    /* The number of initial gain steps is different, by Bruce, 2007-04-13. */
    if (priv->InitialGain == 0) { /* autoDIG */
        /* Advised from SD3 DZ */
        priv->InitialGain = 4; /* In 87B, m74dBm means State 4 (m82dBm) */
    }
    /* Advised from SD3 DZ */
    OfdmFA1 = 0x20;

#if 1 /* lzm reserved 080826 */
    AwakePeriodIn2Sec = (2000 - priv->DozePeriodInPast2Sec);
    priv ->DozePeriodInPast2Sec = 0;

    if (AwakePeriodIn2Sec) {
        OfdmFA1 = (u16)((OfdmFA1 * AwakePeriodIn2Sec) / 2000) ;
        OfdmFA2 = (u16)((OfdmFA2 * AwakePeriodIn2Sec) / 2000) ;
    } else {
        ;
    }
#endif

    InitialGainStep = 8;
    LowestGainStage = priv->RegBModeGainStage; /* Lowest gain stage. */

    if (OFDMFalseAlarm > OfdmFA1) {
        if (OFDMFalseAlarm > OfdmFA2) {
            priv->DIG_NumberFallbackVote++;
            if (priv->DIG_NumberFallbackVote > 1) {
                /* serious OFDM  False Alarm, need fallback */
                if (priv->InitialGain < InitialGainStep) {
                    priv->InitialGainBackUp = priv->InitialGain;

                    priv->InitialGain = (priv->InitialGain + 1);
                    UpdateInitialGain(dev);
                }
                priv->DIG_NumberFallbackVote = 0;
                priv->DIG_NumberUpgradeVote = 0;
            }
        } else {
            if (priv->DIG_NumberFallbackVote)
                priv->DIG_NumberFallbackVote--;
        }
        priv->DIG_NumberUpgradeVote = 0;
    } else {
        if (priv->DIG_NumberFallbackVote)
            priv->DIG_NumberFallbackVote--;
        priv->DIG_NumberUpgradeVote++;

        if (priv->DIG_NumberUpgradeVote > 9) {
            if (priv->InitialGain > LowestGainStage) { /* In 87B, m78dBm means State 4 (m864dBm) */
                priv->InitialGainBackUp = priv->InitialGain;

                priv->InitialGain = (priv->InitialGain - 1);
                UpdateInitialGain(dev);
            }
            priv->DIG_NumberFallbackVote = 0;
            priv->DIG_NumberUpgradeVote = 0;
        }
    }
}

/*
 *  Dispatch DIG implementation according to RF.
 */
void DynamicInitGain(struct net_device *dev)
{
    DIG_Zebra(dev);
}

void rtl8180_hw_dig_wq(struct work_struct *work)
{
    struct delayed_work *dwork = to_delayed_work(work);
    struct ieee80211_device *ieee = container_of(dwork,struct ieee80211_device,hw_dig_wq);
    struct net_device *dev = ieee->dev;
    struct r8180_priv *priv = ieee80211_priv(dev);

    /* Read CCK and OFDM False Alarm. */
    priv->FalseAlarmRegValue = read_nic_dword(dev, CCK_FALSE_ALARM);


    /* Adjust Initial Gain dynamically. */
    DynamicInitGain(dev);

}

int IncludedInSupportedRates(struct r8180_priv *priv, u8 TxRate)
{
    u8 rate_len;
    u8 rate_ex_len;
    u8                      RateMask = 0x7F;
    u8                      idx;
    unsigned short          Found = 0;
    u8                      NaiveTxRate = TxRate&RateMask;

    rate_len = priv->ieee80211->current_network.rates_len;
    rate_ex_len = priv->ieee80211->current_network.rates_ex_len;
    for (idx=0; idx < rate_len; idx++) {
        if ((priv->ieee80211->current_network.rates[idx] & RateMask) == NaiveTxRate) {
            Found = 1;
            goto found_rate;
        }
    }
    for (idx = 0; idx < rate_ex_len; idx++) {
        if ((priv->ieee80211->current_network.rates_ex[idx] & RateMask) == NaiveTxRate) {
            Found = 1;
            goto found_rate;
        }
    }
    return Found;
    found_rate:
    return Found;
}

/*
 *  Get the Tx rate one degree up form the input rate in the supported rates.
 *  Return the upgrade rate if it is successed, otherwise return the input rate.
 */
u8 GetUpgradeTxRate(struct net_device *dev, u8 rate)
{
    struct r8180_priv *priv = ieee80211_priv(dev);
    u8                      UpRate;

    /* Upgrade 1 degree. */
    switch (rate) {
    case 108: /* Up to 54Mbps. */
        UpRate = 108;
        break;

    case 96: /* Up to 54Mbps. */
        UpRate = 108;
        break;

    case 72: /* Up to 48Mbps. */
        UpRate = 96;
        break;

    case 48: /* Up to 36Mbps. */
        UpRate = 72;
        break;

    case 36: /* Up to 24Mbps. */
        UpRate = 48;
        break;

    case 22: /* Up to 18Mbps. */
        UpRate = 36;
        break;

    case 11: /* Up to 11Mbps. */
        UpRate = 22;
        break;

    case 4: /* Up to 5.5Mbps. */
        UpRate = 11;
        break;

    case 2: /* Up to 2Mbps. */
        UpRate = 4;
        break;

    default:
        printk("GetUpgradeTxRate(): Input Tx Rate(%d) is undefined!\n", rate);
        return rate;
    }
    /* Check if the rate is valid. */
    if (IncludedInSupportedRates(priv, UpRate)) {
        return UpRate;
    } else {
        return rate;
    }
    return rate;
}
/*
 *  Get the Tx rate one degree down form the input rate in the supported rates.
 *  Return the degrade rate if it is successed, otherwise return the input rate.
 */

u8 GetDegradeTxRate(struct net_device *dev, u8 rate)
{
    struct r8180_priv *priv = ieee80211_priv(dev);
    u8                      DownRate;

    /* Upgrade 1 degree. */
    switch (rate) {
    case 108: /* Down to 48Mbps. */
        DownRate = 96;
        break;

    case 96: /* Down to 36Mbps. */
        DownRate = 72;
        break;

    case 72: /* Down to 24Mbps. */
        DownRate = 48;
        break;

    case 48: /* Down to 18Mbps. */
        DownRate = 36;
        break;

    case 36: /* Down to 11Mbps. */
        DownRate = 22;
        break;

    case 22: /* Down to 5.5Mbps. */
        DownRate = 11;
        break;

    case 11: /* Down to 2Mbps. */
        DownRate = 4;
        break;

    case 4: /* Down to 1Mbps. */
        DownRate = 2;
        break;

    case 2: /* Down to 1Mbps. */
        DownRate = 2;
        break;

    default:
        printk("GetDegradeTxRate(): Input Tx Rate(%d) is undefined!\n", rate);
        return rate;
    }
    /* Check if the rate is valid. */
    if (IncludedInSupportedRates(priv, DownRate)) {
        return DownRate;
    } else {
        return rate;
    }
    return rate;
}
/*
 *      Helper function to determine if specified data rate is
 *      CCK rate.
 */

bool MgntIsCckRate(u16 rate)
{
    bool bReturn = false;

    if ((rate <= 22) && (rate != 12) && (rate != 18)) {
        bReturn = true;
    }

    return bReturn;
}
/*
 *  Description:
 *      Tx Power tracking mechanism routine on 87SE.
 */
void TxPwrTracking87SE(struct net_device *dev)
{
    struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);
    u8  tmpu1Byte, CurrentThermal, Idx;
    char    CckTxPwrIdx, OfdmTxPwrIdx;

    tmpu1Byte = read_nic_byte(dev, EN_LPF_CAL);
    CurrentThermal = (tmpu1Byte & 0xf0) >> 4; /*[ 7:4]: thermal meter indication. */
    CurrentThermal = (CurrentThermal > 0x0c) ? 0x0c:CurrentThermal;/* lzm add 080826 */

    if (CurrentThermal != priv->ThermalMeter) {
        /* Update Tx Power level on each channel. */
        for (Idx = 1; Idx < 15; Idx++) {
            CckTxPwrIdx = priv->chtxpwr[Idx];
            OfdmTxPwrIdx = priv->chtxpwr_ofdm[Idx];

            if (CurrentThermal > priv->ThermalMeter) {
                /* higher thermal meter. */
                CckTxPwrIdx += (CurrentThermal - priv->ThermalMeter) * 2;
                OfdmTxPwrIdx += (CurrentThermal - priv->ThermalMeter) * 2;

                if (CckTxPwrIdx > 35)
                    CckTxPwrIdx = 35; /* Force TxPower to maximal index. */
                if (OfdmTxPwrIdx > 35)
                    OfdmTxPwrIdx = 35;
            } else {
                /* lower thermal meter. */
                CckTxPwrIdx -= (priv->ThermalMeter - CurrentThermal) * 2;
                OfdmTxPwrIdx -= (priv->ThermalMeter - CurrentThermal) * 2;

                if (CckTxPwrIdx < 0)
                    CckTxPwrIdx = 0;
                if (OfdmTxPwrIdx < 0)
                    OfdmTxPwrIdx = 0;
            }

            /* Update TxPower level on CCK and OFDM resp. */
            priv->chtxpwr[Idx] = CckTxPwrIdx;
            priv->chtxpwr_ofdm[Idx] = OfdmTxPwrIdx;
        }

        /* Update TxPower level immediately. */
        rtl8225z2_SetTXPowerLevel(dev, priv->ieee80211->current_network.channel);
    }
    priv->ThermalMeter = CurrentThermal;
}
void StaRateAdaptive87SE(struct net_device *dev)
{
    struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);
    unsigned long   CurrTxokCnt;
    u16     CurrRetryCnt;
    u16     CurrRetryRate;
    unsigned long   CurrRxokCnt;
    bool        bTryUp = false;
    bool        bTryDown = false;
    u8      TryUpTh = 1;
    u8      TryDownTh = 2;
    u32     TxThroughput;
    long        CurrSignalStrength;
    bool        bUpdateInitialGain = false;
    u8      u1bOfdm = 0, u1bCck = 0;
    char        OfdmTxPwrIdx, CckTxPwrIdx;

    priv->RateAdaptivePeriod = RATE_ADAPTIVE_TIMER_PERIOD;


    CurrRetryCnt    = priv->CurrRetryCnt;
    CurrTxokCnt = priv->NumTxOkTotal - priv->LastTxokCnt;
    CurrRxokCnt = priv->ieee80211->NumRxOkTotal - priv->LastRxokCnt;
    CurrSignalStrength = priv->Stats_RecvSignalPower;
    TxThroughput = (u32)(priv->NumTxOkBytesTotal - priv->LastTxOKBytes);
    priv->LastTxOKBytes = priv->NumTxOkBytesTotal;
    priv->CurrentOperaRate = priv->ieee80211->rate / 5;
    /* 2 Compute retry ratio. */
    if (CurrTxokCnt > 0) {
        CurrRetryRate = (u16)(CurrRetryCnt * 100 / CurrTxokCnt);
    } else {
    /* It may be serious retry. To distinguish serious retry or no packets modified by Bruce */
        CurrRetryRate = (u16)(CurrRetryCnt * 100 / 1);
    }

    priv->LastRetryCnt = priv->CurrRetryCnt;
    priv->LastTxokCnt = priv->NumTxOkTotal;
    priv->LastRxokCnt = priv->ieee80211->NumRxOkTotal;
    priv->CurrRetryCnt = 0;

    /* 2No Tx packets, return to init_rate or not? */
    if (CurrRetryRate == 0 && CurrTxokCnt == 0) {
        /*
         * After 9 (30*300ms) seconds in this condition, we try to raise rate.
         */
        priv->TryupingCountNoData++;

        /* [TRC Dell Lab] Extend raised period from 4.5sec to 9sec, Isaiah 2008-02-15 18:00 */
        if (priv->TryupingCountNoData > 30) {
            priv->TryupingCountNoData = 0;
            priv->CurrentOperaRate = GetUpgradeTxRate(dev, priv->CurrentOperaRate);
            /* Reset Fail Record */
            priv->LastFailTxRate = 0;
            priv->LastFailTxRateSS = -200;
            priv->FailTxRateCount = 0;
        }
        goto SetInitialGain;
    } else {
        priv->TryupingCountNoData = 0; /*Reset trying up times. */
    }


    /*
     * For Netgear case, I comment out the following signal strength estimation,
     * which can results in lower rate to transmit when sample is NOT enough (e.g. PING request).
     *
     * Restructure rate adaptive as the following main stages:
     * (1) Add retry threshold in 54M upgrading condition with signal strength.
     * (2) Add the mechanism to degrade to CCK rate according to signal strength
     *      and retry rate.
     * (3) Remove all Initial Gain Updates over OFDM rate. To avoid the complicated
     *      situation, Initial Gain Update is upon on DIG mechanism except CCK rate.
     * (4) Add the mechanism of trying to upgrade tx rate.
     * (5) Record the information of upping tx rate to avoid trying upping tx rate constantly.
     *
     */

    /*
     *  11Mbps or 36Mbps
     * Check more times in these rate(key rates).
     */
    if (priv->CurrentOperaRate == 22 || priv->CurrentOperaRate == 72)
        TryUpTh += 9;
    /*
     * Let these rates down more difficult.
     */
    if (MgntIsCckRate(priv->CurrentOperaRate) || priv->CurrentOperaRate == 36)
        TryDownTh += 1;

    /* 1 Adjust Rate. */
    if (priv->bTryuping == true) {
        /* 2 For Test Upgrading mechanism
         * Note:
         *  Sometimes the throughput is upon on the capability between the AP and NIC,
         *  thus the low data rate does not improve the performance.
         *  We randomly upgrade the data rate and check if the retry rate is improved.
         */

        /* Upgrading rate did not improve the retry rate, fallback to the original rate. */
        if ((CurrRetryRate > 25) && TxThroughput < priv->LastTxThroughput) {
            /*Not necessary raising rate, fall back rate. */
            bTryDown = true;
        } else {
            priv->bTryuping = false;
        }
    } else if (CurrSignalStrength > -47 && (CurrRetryRate < 50)) {
        /*
         * 2For High Power
         *
         * Return to highest data rate, if signal strength is good enough.
         * SignalStrength threshold(-50dbm) is for RTL8186.
         * Revise SignalStrength threshold to -51dbm.
         */
        /* Also need to check retry rate for safety, by Bruce, 2007-06-05. */
        if (priv->CurrentOperaRate != priv->ieee80211->current_network.HighestOperaRate) {
            bTryUp = true;
            /* Upgrade Tx Rate directly. */
            priv->TryupingCount += TryUpTh;
        }

    } else if (CurrTxokCnt > 9 && CurrTxokCnt < 100 && CurrRetryRate >= 600) {
        /*
         *2 For Serious Retry
         *
         * Traffic is not busy but our Tx retry is serious.
         */
        bTryDown = true;
        /* Let Rate Mechanism to degrade tx rate directly. */
        priv->TryDownCountLowData += TryDownTh;
    } else if (priv->CurrentOperaRate == 108) {
        /* 2For 54Mbps */
        /* Air Link */
        if ((CurrRetryRate > 26) && (priv->LastRetryRate > 25)) {
            bTryDown = true;
        }
        /* Cable Link */
        else if ((CurrRetryRate > 17) && (priv->LastRetryRate > 16) && (CurrSignalStrength > -72)) {
            bTryDown = true;
        }

        if (bTryDown && (CurrSignalStrength < -75)) /* cable link */
            priv->TryDownCountLowData += TryDownTh;
    }
    else if (priv->CurrentOperaRate == 96) {
        /* 2For 48Mbps */
        /* Air Link */
        if (((CurrRetryRate > 48) && (priv->LastRetryRate > 47))) {
            bTryDown = true;
        } else if (((CurrRetryRate > 21) && (priv->LastRetryRate > 20)) && (CurrSignalStrength > -74)) { /* Cable Link */
            /* Down to rate 36Mbps. */
            bTryDown = true;
        } else if ((CurrRetryRate > (priv->LastRetryRate + 50)) && (priv->FailTxRateCount > 2)) {
            bTryDown = true;
            priv->TryDownCountLowData += TryDownTh;
        } else if ((CurrRetryRate < 8) && (priv->LastRetryRate < 8)) { /* TO DO: need to consider (RSSI) */
            bTryUp = true;
        }

        if (bTryDown && (CurrSignalStrength < -75)){
            priv->TryDownCountLowData += TryDownTh;
        }
    } else if (priv->CurrentOperaRate == 72) {
        /* 2For 36Mbps */
        if ((CurrRetryRate > 43) && (priv->LastRetryRate > 41)) {
            /* Down to rate 24Mbps. */
            bTryDown = true;
        } else if ((CurrRetryRate > (priv->LastRetryRate + 50)) && (priv->FailTxRateCount > 2)) {
            bTryDown = true;
            priv->TryDownCountLowData += TryDownTh;
        } else if ((CurrRetryRate < 15) &&  (priv->LastRetryRate < 16)) { /* TO DO: need to consider (RSSI) */
            bTryUp = true;
        }

        if (bTryDown && (CurrSignalStrength < -80))
            priv->TryDownCountLowData += TryDownTh;

    } else if (priv->CurrentOperaRate == 48) {
        /* 2For 24Mbps */
        /* Air Link */
        if (((CurrRetryRate > 63) && (priv->LastRetryRate > 62))) {
            bTryDown = true;
        } else if (((CurrRetryRate > 33) && (priv->LastRetryRate > 32)) && (CurrSignalStrength > -82)) { /* Cable Link */
            bTryDown = true;
        } else if ((CurrRetryRate > (priv->LastRetryRate + 50)) && (priv->FailTxRateCount > 2 )) {
            bTryDown = true;
            priv->TryDownCountLowData += TryDownTh;
        } else if ((CurrRetryRate < 20) && (priv->LastRetryRate < 21)) { /* TO DO: need to consider (RSSI) */
            bTryUp = true;
        }

        if (bTryDown && (CurrSignalStrength < -82))
            priv->TryDownCountLowData += TryDownTh;

    } else if (priv->CurrentOperaRate == 36) {
        if (((CurrRetryRate > 85) && (priv->LastRetryRate > 86))) {
            bTryDown = true;
        } else if ((CurrRetryRate > (priv->LastRetryRate + 50)) && (priv->FailTxRateCount > 2)) {
            bTryDown = true;
            priv->TryDownCountLowData += TryDownTh;
        } else if ((CurrRetryRate < 22) && (priv->LastRetryRate < 23)) { /* TO DO: need to consider (RSSI) */
            bTryUp = true;
        }
    } else if (priv->CurrentOperaRate == 22) {
        /* 2For 11Mbps */
        if (CurrRetryRate > 95) {
            bTryDown = true;
        }
        else if ((CurrRetryRate < 29) && (priv->LastRetryRate < 30)) { /*TO DO: need to consider (RSSI) */
            bTryUp = true;
        }
    } else if (priv->CurrentOperaRate == 11) {
        /* 2For 5.5Mbps */
        if (CurrRetryRate > 149) {
            bTryDown = true;
        } else if ((CurrRetryRate < 60) && (priv->LastRetryRate < 65)) {
            bTryUp = true;
        }
    } else if (priv->CurrentOperaRate == 4) {
        /* 2For 2 Mbps */
        if ((CurrRetryRate > 99) && (priv->LastRetryRate > 99)) {
            bTryDown = true;
        } else if ((CurrRetryRate < 65) && (priv->LastRetryRate < 70)) {
            bTryUp = true;
        }
    } else if (priv->CurrentOperaRate == 2) {
        /* 2For 1 Mbps */
        if ((CurrRetryRate < 70) && (priv->LastRetryRate < 75)) {
            bTryUp = true;
        }
    }

    if (bTryUp && bTryDown)
    printk("StaRateAdaptive87B(): Tx Rate tried upping and downing simultaneously!\n");

    /* 1 Test Upgrading Tx Rate
     * Sometimes the cause of the low throughput (high retry rate) is the compatibility between the AP and NIC.
     * To test if the upper rate may cause lower retry rate, this mechanism randomly occurs to test upgrading tx rate.
     */ 
    if (!bTryUp && !bTryDown && (priv->TryupingCount == 0) && (priv->TryDownCountLowData == 0)
        && priv->CurrentOperaRate != priv->ieee80211->current_network.HighestOperaRate && priv->FailTxRateCount < 2) {
        if (jiffies % (CurrRetryRate + 101) == 0) {
            bTryUp = true;
            priv->bTryuping = true;
        }
    }

    /* 1 Rate Mechanism */
    if (bTryUp) {
        priv->TryupingCount++;
        priv->TryDownCountLowData = 0;

        /*
         * Check more times if we need to upgrade indeed.
         * Because the largest value of pHalData->TryupingCount is 0xFFFF and
         * the largest value of pHalData->FailTxRateCount is 0x14,
         * this condition will be satisfied at most every 2 min.
         */

        if ((priv->TryupingCount > (TryUpTh + priv->FailTxRateCount * priv->FailTxRateCount)) ||
            (CurrSignalStrength > priv->LastFailTxRateSS) || priv->bTryuping) {
            priv->TryupingCount = 0;
            /*
             * When transferring from CCK to OFDM, DIG is an important issue.
             */
            if (priv->CurrentOperaRate == 22)
                bUpdateInitialGain = true;

            /* 
             * The difference in throughput between 48Mbps and 36Mbps is 8M.
             * So, we must be careful in this rate scale. Isaiah 2008-02-15.
             */
            if (((priv->CurrentOperaRate == 72) || (priv->CurrentOperaRate == 48) || (priv->CurrentOperaRate == 36)) &&
                (priv->FailTxRateCount > 2))
                priv->RateAdaptivePeriod = (RATE_ADAPTIVE_TIMER_PERIOD / 2);

            /* (1)To avoid upgrade frequently to the fail tx rate, add the FailTxRateCount into the threshold. */
            /* (2)If the signal strength is increased, it may be able to upgrade. */

            priv->CurrentOperaRate = GetUpgradeTxRate(dev, priv->CurrentOperaRate);

            if (priv->CurrentOperaRate == 36) {
                priv->bUpdateARFR = true;
                write_nic_word(dev, ARFR, 0x0F8F); /* bypass 12/9/6 */
            } else if(priv->bUpdateARFR) {
                priv->bUpdateARFR = false;
                write_nic_word(dev, ARFR, 0x0FFF); /* set 1M ~ 54Mbps. */
            }

            /* Update Fail Tx rate and count. */
            if (priv->LastFailTxRate != priv->CurrentOperaRate) {
                priv->LastFailTxRate = priv->CurrentOperaRate;
                priv->FailTxRateCount = 0;
                priv->LastFailTxRateSS = -200; /* Set lowest power. */
            }
        }
    } else {
        if (priv->TryupingCount > 0)
            priv->TryupingCount --;
    }

    if (bTryDown) {
        priv->TryDownCountLowData++;
        priv->TryupingCount = 0;

        /* Check if Tx rate can be degraded or Test trying upgrading should fallback. */
        if (priv->TryDownCountLowData > TryDownTh || priv->bTryuping) {
            priv->TryDownCountLowData = 0;
            priv->bTryuping = false;
            /* Update fail information. */
            if (priv->LastFailTxRate == priv->CurrentOperaRate) {
                priv->FailTxRateCount++;
                /* Record the Tx fail rate signal strength. */
                if (CurrSignalStrength > priv->LastFailTxRateSS)
                    priv->LastFailTxRateSS = CurrSignalStrength;
            } else {
                priv->LastFailTxRate = priv->CurrentOperaRate;
                priv->FailTxRateCount = 1;
                priv->LastFailTxRateSS = CurrSignalStrength;
            }
            priv->CurrentOperaRate = GetDegradeTxRate(dev, priv->CurrentOperaRate);

            /* Reduce chariot training time at weak signal strength situation. SD3 ED demand. */
            if ((CurrSignalStrength < -80) && (priv->CurrentOperaRate > 72 )) {
                priv->CurrentOperaRate = 72;
            }

            if (priv->CurrentOperaRate == 36) {
                priv->bUpdateARFR = true;
                write_nic_word(dev, ARFR, 0x0F8F); /* bypass 12/9/6 */
            } else if (priv->bUpdateARFR) {
                priv->bUpdateARFR = false;
                write_nic_word(dev, ARFR, 0x0FFF); /* set 1M ~ 54Mbps. */
            }

            /*
             * When it is CCK rate, it may need to update initial gain to receive lower power packets.
             */
            if (MgntIsCckRate(priv->CurrentOperaRate)) {
                bUpdateInitialGain = true;
            }
        }
    } else {
        if (priv->TryDownCountLowData > 0)
            priv->TryDownCountLowData--;
    }

    /* 
     * Keep the Tx fail rate count to equal to 0x15 at most. 
     * Reduce the fail count at least to 10 sec if tx rate is tending stable.
     */
    if (priv->FailTxRateCount >= 0x15 ||
        (!bTryUp && !bTryDown && priv->TryDownCountLowData == 0 && priv->TryupingCount && priv->FailTxRateCount > 0x6)) {
        priv->FailTxRateCount--;
    }


    OfdmTxPwrIdx  = priv->chtxpwr_ofdm[priv->ieee80211->current_network.channel];
    CckTxPwrIdx  = priv->chtxpwr[priv->ieee80211->current_network.channel];

    /* Mac0x9e increase 2 level in 36M~18M situation */
    if ((priv->CurrentOperaRate < 96) && (priv->CurrentOperaRate > 22)) {
        u1bCck = read_nic_byte(dev, CCK_TXAGC);
        u1bOfdm = read_nic_byte(dev, OFDM_TXAGC);

        /* case 1: Never enter High power */
        if (u1bCck == CckTxPwrIdx) {
            if (u1bOfdm != (OfdmTxPwrIdx + 2)) {
            priv->bEnhanceTxPwr = true;
            u1bOfdm = ((u1bOfdm + 2) > 35) ? 35: (u1bOfdm + 2);
            write_nic_byte(dev, OFDM_TXAGC, u1bOfdm);
            }
        } else if (u1bCck < CckTxPwrIdx) {
        /* case 2: enter high power */
            if (!priv->bEnhanceTxPwr) {
                priv->bEnhanceTxPwr = true;
                u1bOfdm = ((u1bOfdm + 2) > 35) ? 35: (u1bOfdm + 2);
                write_nic_byte(dev, OFDM_TXAGC, u1bOfdm);
            }
        }
    } else if (priv->bEnhanceTxPwr) {  /* 54/48/11/5.5/2/1 */
        u1bCck = read_nic_byte(dev, CCK_TXAGC);
        u1bOfdm = read_nic_byte(dev, OFDM_TXAGC);

        /* case 1: Never enter High power */
        if (u1bCck == CckTxPwrIdx) {
            priv->bEnhanceTxPwr = false;
            write_nic_byte(dev, OFDM_TXAGC, OfdmTxPwrIdx);
        }
        /* case 2: enter high power */
        else if (u1bCck < CckTxPwrIdx) {
            priv->bEnhanceTxPwr = false;
            u1bOfdm = ((u1bOfdm - 2) > 0) ? (u1bOfdm - 2): 0;
            write_nic_byte(dev, OFDM_TXAGC, u1bOfdm);
        }
    }

    /*
     * We need update initial gain when we set tx rate "from OFDM to CCK" or
     * "from CCK to OFDM".
     */
SetInitialGain:
    if (bUpdateInitialGain) {
        if (MgntIsCckRate(priv->CurrentOperaRate)) { /* CCK */
            if (priv->InitialGain > priv->RegBModeGainStage) {
                priv->InitialGainBackUp = priv->InitialGain;

                if (CurrSignalStrength < -85) /* Low power, OFDM [0x17] = 26. */
                    /* SD3 SYs suggest that CurrSignalStrength < -65, ofdm 0x17=26. */
                    priv->InitialGain = priv->RegBModeGainStage;

                else if (priv->InitialGain > priv->RegBModeGainStage + 1)
                    priv->InitialGain -= 2;

                else
                    priv->InitialGain--;

                printk("StaRateAdaptive87SE(): update init_gain to index %d for date rate %d\n",priv->InitialGain, priv->CurrentOperaRate);
                UpdateInitialGain(dev);
            }
        } else { /* OFDM */
            if (priv->InitialGain < 4) {
                priv->InitialGainBackUp = priv->InitialGain;

                priv->InitialGain++;
                printk("StaRateAdaptive87SE(): update init_gain to index %d for date rate %d\n",priv->InitialGain, priv->CurrentOperaRate);
                UpdateInitialGain(dev);
            }
        }
    }

    /* Record the related info */
    priv->LastRetryRate = CurrRetryRate;
    priv->LastTxThroughput = TxThroughput;
    priv->ieee80211->rate = priv->CurrentOperaRate * 5;
}

void rtl8180_rate_adapter(struct work_struct *work)
{
    struct delayed_work *dwork = to_delayed_work(work);
    struct ieee80211_device *ieee = container_of(dwork, struct ieee80211_device, rate_adapter_wq);
    struct net_device *dev = ieee->dev;
    StaRateAdaptive87SE(dev);
}
void timer_rate_adaptive(unsigned long data)
{
    struct r8180_priv *priv = ieee80211_priv((struct net_device *)data);
    if (!priv->up) {
        return;
    }
    if ((priv->ieee80211->iw_mode != IW_MODE_MASTER)
            && (priv->ieee80211->state == IEEE80211_LINKED) &&
            (priv->ForcedDataRate == 0)) {
        queue_work(priv->ieee80211->wq, (void *)&priv->ieee80211->rate_adapter_wq);
    }
    priv->rateadapter_timer.expires = jiffies + MSECS(priv->RateAdaptivePeriod);
    add_timer(&priv->rateadapter_timer);
}

void SwAntennaDiversityRxOk8185(struct net_device *dev, u8 SignalStrength)
{
    struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);

    priv->AdRxOkCnt++;

    if (priv->AdRxSignalStrength != -1) {
        priv->AdRxSignalStrength = ((priv->AdRxSignalStrength * 7) + (SignalStrength * 3)) / 10;
    } else { /* Initialization case. */
        priv->AdRxSignalStrength = SignalStrength;
    }
    
    if (priv->LastRxPktAntenna) /* Main antenna. */
        priv->AdMainAntennaRxOkCnt++;
    else     /* Aux antenna. */
        priv->AdAuxAntennaRxOkCnt++;
}
 /* Change Antenna Switch. */
bool SetAntenna8185(struct net_device *dev, u8 u1bAntennaIndex)
{
    struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);
    bool bAntennaSwitched = false;

    switch (u1bAntennaIndex) {
    case 0:
        /* Mac register, main antenna */
        write_nic_byte(dev, ANTSEL, 0x03);
        /* base band */
        write_phy_cck(dev, 0x11, 0x9b); /* Config CCK RX antenna. */
        write_phy_ofdm(dev, 0x0d, 0x5c); /* Config OFDM RX antenna. */

        bAntennaSwitched = true;
        break;

    case 1:
        /* Mac register, aux antenna */
        write_nic_byte(dev, ANTSEL, 0x00);
        /* base band */
        write_phy_cck(dev, 0x11, 0xbb); /* Config CCK RX antenna. */
        write_phy_ofdm(dev, 0x0d, 0x54); /* Config OFDM RX antenna. */

        bAntennaSwitched = true;

        break;

    default:
        printk("SetAntenna8185: unknown u1bAntennaIndex(%d)\n", u1bAntennaIndex);
        break;
    }

    if(bAntennaSwitched)
        priv->CurrAntennaIndex = u1bAntennaIndex;

    return bAntennaSwitched;
}
 /* Toggle Antenna switch. */
bool SwitchAntenna(struct net_device *dev)
{
    struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);

    bool        bResult;

    if (priv->CurrAntennaIndex == 0) {
        bResult = SetAntenna8185(dev, 1);
    } else {
        bResult = SetAntenna8185(dev, 0);
    }

    return bResult;
}
/*
 * Engine of SW Antenna Diversity mechanism.
 * Since 8187 has no Tx part information,
 * this implementation is only dependend on Rx part information.
 */
void SwAntennaDiversity(struct net_device *dev)
{
    struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);
    bool   bSwCheckSS = false;
    if (bSwCheckSS) {
        priv->AdTickCount++;

        printk("(1) AdTickCount: %d, AdCheckPeriod: %d\n",
            priv->AdTickCount, priv->AdCheckPeriod);
        printk("(2) AdRxSignalStrength: %ld, AdRxSsThreshold: %ld\n",
            priv->AdRxSignalStrength, priv->AdRxSsThreshold);
    }

    /* Case 1. No Link. */
    if (priv->ieee80211->state != IEEE80211_LINKED) {
        priv->bAdSwitchedChecking = false;
        /* I switch antenna here to prevent any one of antenna is broken before link established, 2006.04.18, by rcnjko.. */
        SwitchAntenna(dev);

      /* Case 2. Linked but no packet receive.d */
    } else if (priv->AdRxOkCnt == 0) {
        priv->bAdSwitchedChecking = false;
        SwitchAntenna(dev);

      /* Case 3. Evaluate last antenna switch action and undo it if necessary. */
    } else if (priv->bAdSwitchedChecking == true) {
        priv->bAdSwitchedChecking = false;

        /* Adjust Rx signal strength threshold. */
        priv->AdRxSsThreshold = (priv->AdRxSignalStrength + priv->AdRxSsBeforeSwitched) / 2;

        priv->AdRxSsThreshold = (priv->AdRxSsThreshold > priv->AdMaxRxSsThreshold) ?
                    priv->AdMaxRxSsThreshold: priv->AdRxSsThreshold;
        if(priv->AdRxSignalStrength < priv->AdRxSsBeforeSwitched) {
        /* Rx signal strength is not improved after we swtiched antenna. => Swich back. */
            /* Increase Antenna Diversity checking period due to bad decision. */
            priv->AdCheckPeriod *= 2;
            /* Increase Antenna Diversity checking period. */
            if (priv->AdCheckPeriod > priv->AdMaxCheckPeriod)
                priv->AdCheckPeriod = priv->AdMaxCheckPeriod;

            /* Wrong decision => switch back. */
            SwitchAntenna(dev);
        } else {
        /* Rx Signal Strength is improved. */

            /* Reset Antenna Diversity checking period to its min value. */
            priv->AdCheckPeriod = priv->AdMinCheckPeriod;
        }

    }
    /* Case 4. Evaluate if we shall switch antenna now. */
    /* Cause Table Speed is very fast in TRC Dell Lab, we check it every time. */
    else {
        priv->AdTickCount = 0;

        /*
         * <Roger_Notes> We evaluate RxOk counts for each antenna first and than
         * evaluate signal strength.
         * The following operation can overcome the disability of CCA on both two antennas
         * When signal strength was extremely low or high.
         * 2008.01.30.
         */

        /*
         * Evaluate RxOk count from each antenna if we shall switch default antenna now.
         */
        if ((priv->AdMainAntennaRxOkCnt < priv->AdAuxAntennaRxOkCnt)
            && (priv->CurrAntennaIndex == 0)) {
        /* We set Main antenna as default but RxOk count was less than Aux ones. */

            /* Switch to Aux antenna. */
            SwitchAntenna(dev);
            priv->bHWAdSwitched = true;
        } else if ((priv->AdAuxAntennaRxOkCnt < priv->AdMainAntennaRxOkCnt)
            && (priv->CurrAntennaIndex == 1)) {
        /* We set Aux antenna as default but RxOk count was less than Main ones. */

            /* Switch to Main antenna. */
            SwitchAntenna(dev);
            priv->bHWAdSwitched = true;
        } else {
        /* Default antenna is better. */

            /* Still need to check current signal strength. */
            priv->bHWAdSwitched = false;
        }
        /*
         * <Roger_Notes> We evaluate Rx signal strength ONLY when default antenna
         * didn't change by HW evaluation.
         * 2008.02.27.
         *
         * [TRC Dell Lab] SignalStrength is inaccuracy. Isaiah 2008-03-05
         * For example, Throughput of aux is better than main antenna(about 10M v.s 2M),
         * but AdRxSignalStrength is less than main.
         * Our guess is that main antenna have lower throughput and get many change
         * to receive more CCK packets(ex.Beacon) which have stronger SignalStrength.
         */
        if ((!priv->bHWAdSwitched) && (bSwCheckSS)) {
            /* Evaluate Rx signal strength if we shall switch antenna now. */
            if (priv->AdRxSignalStrength < priv->AdRxSsThreshold) {
            /* Rx signal strength is weak => Switch Antenna. */
                priv->AdRxSsBeforeSwitched = priv->AdRxSignalStrength;
                priv->bAdSwitchedChecking = true;

                SwitchAntenna(dev);
            } else {
            /* Rx signal strength is OK. */
                priv->bAdSwitchedChecking = false;
                /* Increase Rx signal strength threshold if necessary. */
                if ((priv->AdRxSignalStrength > (priv->AdRxSsThreshold + 10)) && /* Signal is much stronger than current threshold */
                    priv->AdRxSsThreshold <= priv->AdMaxRxSsThreshold) { /* Current threhold is not yet reach upper limit. */

                    priv->AdRxSsThreshold = (priv->AdRxSsThreshold + priv->AdRxSignalStrength) / 2;
                    priv->AdRxSsThreshold = (priv->AdRxSsThreshold > priv->AdMaxRxSsThreshold) ?
                                priv->AdMaxRxSsThreshold: priv->AdRxSsThreshold;/* +by amy 080312 */
                }

                /* Reduce Antenna Diversity checking period if possible. */
                if (priv->AdCheckPeriod > priv->AdMinCheckPeriod)
                    priv->AdCheckPeriod /= 2;
            }
        }
    }
    /* Reset antenna diversity Rx related statistics. */
    priv->AdRxOkCnt = 0;
    priv->AdMainAntennaRxOkCnt = 0;
    priv->AdAuxAntennaRxOkCnt = 0;
}

 /* Return TRUE if we shall perform Tx Power Tracking Mechanism, FALSE otherwise. */
bool CheckTxPwrTracking(struct net_device *dev)
{
    struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);

    if (!priv->bTxPowerTrack)
        return false;

    /* if 87SE is in High Power , don't do Tx Power Tracking. asked by SD3 ED. 2008-08-08 Isaiah */
    if (priv->bToUpdateTxPwr)
        return false;

    return true;
}


 /* Timer callback function of SW Antenna Diversity. */
void SwAntennaDiversityTimerCallback(struct net_device *dev)
{
    struct r8180_priv *priv = (struct r8180_priv *)ieee80211_priv(dev);
    RT_RF_POWER_STATE rtState;

     /* We do NOT need to switch antenna while RF is off. */
    rtState = priv->eRFPowerState;
    do {
        if (rtState == eRfOff) {
            break;
        } else if (rtState == eRfSleep) {
            /* Don't access BB/RF under Disable PLL situation. */
            break;
        }
        SwAntennaDiversity(dev);

    } while (false);

    if (priv->up) {
        priv->SwAntennaDiversityTimer.expires = jiffies + MSECS(ANTENNA_DIVERSITY_TIMER_PERIOD);
        add_timer(&priv->SwAntennaDiversityTimer);
    }
}