drivers/net/wireless/ath/ath9k/ar9003_paprd.c

   1 /*
   2  * Copyright (c) 2010-2011 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/export.h>
  18 #include "hw.h"
  19 #include "ar9003_phy.h"
  20
  21 void ar9003_paprd_enable(struct ath_hw *ah, bool val)
  22 {
  23         struct ath9k_channel *chan = ah->curchan;
  24         struct ar9300_eeprom *eep = &ah->eeprom.ar9300_eep;
  25
  26         /*
  27          * 3 bits for modalHeader5G.papdRateMaskHt20
  28          * is used for sub-band disabling of PAPRD.
  29          * 5G band is divided into 3 sub-bands -- upper,
  30          * middle, lower.
  31          * if bit 30 of modalHeader5G.papdRateMaskHt20 is set
  32          * -- disable PAPRD for upper band 5GHz
  33          * if bit 29 of modalHeader5G.papdRateMaskHt20 is set
  34          * -- disable PAPRD for middle band 5GHz
  35          * if bit 28 of modalHeader5G.papdRateMaskHt20 is set
  36          * -- disable PAPRD for lower band 5GHz
  37          */
  38
  39         if (IS_CHAN_5GHZ(chan)) {
  40                 if (chan->channel >= UPPER_5G_SUB_BAND_START) {
  41                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  42                                                                   & BIT(30))
  43                                 val = false;
  44                 } else if (chan->channel >= MID_5G_SUB_BAND_START) {
  45                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  46                                                                   & BIT(29))
  47                                 val = false;
  48                 } else {
  49                         if (le32_to_cpu(eep->modalHeader5G.papdRateMaskHt20)
  50                                                                   & BIT(28))
  51                                 val = false;
  52                 }
  53         }
  54
  55         if (val) {
  56                 ah->paprd_table_write_done = true;
  57                 ath9k_hw_apply_txpower(ah, chan, false);
  58         }
  59
  60         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B0,
  61                       AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  62         if (ah->caps.tx_chainmask & BIT(1))
  63                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B1,
  64                               AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  65         if (ah->caps.tx_chainmask & BIT(2))
  66                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL0_B2,
  67                               AR_PHY_PAPRD_CTRL0_PAPRD_ENABLE, !!val);
  68 }
  69 EXPORT_SYMBOL(ar9003_paprd_enable);
  70
  71 static int ar9003_get_training_power_2g(struct ath_hw *ah)
  72 {
  73         struct ath9k_channel *chan = ah->curchan;
  74         unsigned int power, scale, delta;
  75
  76         scale = ar9003_get_paprd_scale_factor(ah, chan);
  77         power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE5,
  78                                AR_PHY_POWERTX_RATE5_POWERTXHT20_0);
  79
  80         delta = abs((int) ah->paprd_target_power - (int) power);
  81         if (delta > scale)
  82                 return -1;
  83
  84         if (delta < 4)
  85                 power -= 4 - delta;
  86
  87         return power;
  88 }
  89
  90 static int ar9003_get_training_power_5g(struct ath_hw *ah)
  91 {
  92         struct ath_common *common = ath9k_hw_common(ah);
  93         struct ath9k_channel *chan = ah->curchan;
  94         unsigned int power, scale, delta;
  95
  96         scale = ar9003_get_paprd_scale_factor(ah, chan);
  97
  98         if (IS_CHAN_HT40(chan))
  99                 power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE8,
 100                         AR_PHY_POWERTX_RATE8_POWERTXHT40_5);
 101         else
 102                 power = REG_READ_FIELD(ah, AR_PHY_POWERTX_RATE6,
 103                         AR_PHY_POWERTX_RATE6_POWERTXHT20_5);
 104
 105         power += scale;
 106         delta = abs((int) ah->paprd_target_power - (int) power);
 107         if (delta > scale)
 108                 return -1;
 109
 110         switch (get_streams(ah->txchainmask)) {
 111         case 1:
 112                 delta = 6;
 113                 break;
 114         case 2:
 115                 delta = 4;
 116                 break;
 117         case 3:
 118                 delta = 2;
 119                 break;
 120         default:
 121                 delta = 0;
 122                 ath_dbg(common, CALIBRATE, "Invalid tx-chainmask: %u\n",
 123                         ah->txchainmask);
 124         }
 125
 126         power += delta;
 127         return power;
 128 }
 129
 130 static int ar9003_paprd_setup_single_table(struct ath_hw *ah)
 131 {
 132         struct ath_common *common = ath9k_hw_common(ah);
 133         static const u32 ctrl0[3] = {
 134                 AR_PHY_PAPRD_CTRL0_B0,
 135                 AR_PHY_PAPRD_CTRL0_B1,
 136                 AR_PHY_PAPRD_CTRL0_B2
 137         };
 138         static const u32 ctrl1[3] = {
 139                 AR_PHY_PAPRD_CTRL1_B0,
 140                 AR_PHY_PAPRD_CTRL1_B1,
 141                 AR_PHY_PAPRD_CTRL1_B2
 142         };
 143         int training_power;
 144         int i, val;
 145         u32 am2pm_mask = ah->paprd_ratemask;
 146
 147         if (IS_CHAN_2GHZ(ah->curchan))
 148                 training_power = ar9003_get_training_power_2g(ah);
 149         else
 150                 training_power = ar9003_get_training_power_5g(ah);
 151
 152         ath_dbg(common, CALIBRATE, "Training power: %d, Target power: %d\n",
 153                 training_power, ah->paprd_target_power);
 154
 155         if (training_power < 0) {
 156                 ath_dbg(common, CALIBRATE,
 157                         "PAPRD target power delta out of range\n");
 158                 return -ERANGE;
 159         }
 160         ah->paprd_training_power = training_power;
 161
 162         if (AR_SREV_9330(ah))
 163                 am2pm_mask = 0;
 164
 165         REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2AM, AR_PHY_PAPRD_AM2AM_MASK,
 166                       ah->paprd_ratemask);
 167         REG_RMW_FIELD(ah, AR_PHY_PAPRD_AM2PM, AR_PHY_PAPRD_AM2PM_MASK,
 168                       am2pm_mask);
 169         REG_RMW_FIELD(ah, AR_PHY_PAPRD_HT40, AR_PHY_PAPRD_HT40_MASK,
 170                       ah->paprd_ratemask_ht40);
 171
 172         for (i = 0; i < ah->caps.max_txchains; i++) {
 173                 REG_RMW_FIELD(ah, ctrl0[i],
 174                               AR_PHY_PAPRD_CTRL0_USE_SINGLE_TABLE_MASK, 1);
 175                 REG_RMW_FIELD(ah, ctrl1[i],
 176                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2PM_ENABLE, 1);
 177                 REG_RMW_FIELD(ah, ctrl1[i],
 178                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_AM2AM_ENABLE, 1);
 179                 REG_RMW_FIELD(ah, ctrl1[i],
 180                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
 181                 REG_RMW_FIELD(ah, ctrl1[i],
 182                               AR_PHY_PAPRD_CTRL1_PA_GAIN_SCALE_FACT_MASK, 181);
 183                 REG_RMW_FIELD(ah, ctrl1[i],
 184                               AR_PHY_PAPRD_CTRL1_PAPRD_MAG_SCALE_FACT, 361);
 185                 REG_RMW_FIELD(ah, ctrl1[i],
 186                               AR_PHY_PAPRD_CTRL1_ADAPTIVE_SCALING_ENA, 0);
 187                 REG_RMW_FIELD(ah, ctrl0[i],
 188                               AR_PHY_PAPRD_CTRL0_PAPRD_MAG_THRSH, 3);
 189         }
 190
 191         ar9003_paprd_enable(ah, false);
 192
 193         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 194                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_SKIP, 0x30);
 195         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 196                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_LB_ENABLE, 1);
 197         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 198                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_TX_GAIN_FORCE, 1);
 199         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 200                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_RX_BB_GAIN_FORCE, 0);
 201         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 202                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_IQCORR_ENABLE, 0);
 203         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 204                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_PAPRD_AGC2_SETTLING, 28);
 205         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL1,
 206                       AR_PHY_PAPRD_TRAINER_CNTL1_CF_CF_PAPRD_TRAIN_ENABLE, 1);
 207         val = AR_SREV_9462(ah) ? 0x91 : 147;
 208         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL2,
 209                       AR_PHY_PAPRD_TRAINER_CNTL2_CF_PAPRD_INIT_RX_BB_GAIN, val);
 210         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 211                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_FINE_CORR_LEN, 4);
 212         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 213                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_COARSE_CORR_LEN, 4);
 214         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 215                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_NUM_CORR_STAGES, 7);
 216         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 217                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_MIN_LOOPBACK_DEL, 1);
 218         if (AR_SREV_9485(ah) || AR_SREV_9462(ah) || AR_SREV_9550(ah))
 219                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 220                               AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 221                               -3);
 222         else
 223                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 224                               AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 225                               -6);
 226         val = AR_SREV_9462(ah) ? -10 : -15;
 227         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 228                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_ADC_DESIRED_SIZE,
 229                       val);
 230         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 231                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_BBTXMIX_DISABLE, 1);
 232         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 233                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_SAFETY_DELTA, 0);
 234         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 235                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_MIN_CORR, 400);
 236         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL4,
 237                       AR_PHY_PAPRD_TRAINER_CNTL4_CF_PAPRD_NUM_TRAIN_SAMPLES,
 238                       100);
 239         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_0_B0,
 240                       AR_PHY_PAPRD_PRE_POST_SCALING, 261376);
 241         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_1_B0,
 242                       AR_PHY_PAPRD_PRE_POST_SCALING, 248079);
 243         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_2_B0,
 244                       AR_PHY_PAPRD_PRE_POST_SCALING, 233759);
 245         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_3_B0,
 246                       AR_PHY_PAPRD_PRE_POST_SCALING, 220464);
 247         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_4_B0,
 248                       AR_PHY_PAPRD_PRE_POST_SCALING, 208194);
 249         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_5_B0,
 250                       AR_PHY_PAPRD_PRE_POST_SCALING, 196949);
 251         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_6_B0,
 252                       AR_PHY_PAPRD_PRE_POST_SCALING, 185706);
 253         REG_RMW_FIELD(ah, AR_PHY_PAPRD_PRE_POST_SCALE_7_B0,
 254                       AR_PHY_PAPRD_PRE_POST_SCALING, 175487);
 255         return 0;
 256 }
 257
 258 static void ar9003_paprd_get_gain_table(struct ath_hw *ah)
 259 {
 260         u32 *entry = ah->paprd_gain_table_entries;
 261         u8 *index = ah->paprd_gain_table_index;
 262         u32 reg = AR_PHY_TXGAIN_TABLE;
 263         int i;
 264
 265         memset(entry, 0, sizeof(ah->paprd_gain_table_entries));
 266         memset(index, 0, sizeof(ah->paprd_gain_table_index));
 267
 268         for (i = 0; i < PAPRD_GAIN_TABLE_ENTRIES; i++) {
 269                 entry[i] = REG_READ(ah, reg);
 270                 index[i] = (entry[i] >> 24) & 0xff;
 271                 reg += 4;
 272         }
 273 }
 274
 275 static unsigned int ar9003_get_desired_gain(struct ath_hw *ah, int chain,
 276                                             int target_power)
 277 {
 278         int olpc_gain_delta = 0, cl_gain_mod;
 279         int alpha_therm, alpha_volt;
 280         int therm_cal_value, volt_cal_value;
 281         int therm_value, volt_value;
 282         int thermal_gain_corr, voltage_gain_corr;
 283         int desired_scale, desired_gain = 0;
 284         u32 reg_olpc  = 0, reg_cl_gain  = 0;
 285
 286         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 287                     AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 288         desired_scale = REG_READ_FIELD(ah, AR_PHY_TPC_12,
 289                                        AR_PHY_TPC_12_DESIRED_SCALE_HT40_5);
 290         alpha_therm = REG_READ_FIELD(ah, AR_PHY_TPC_19,
 291                                      AR_PHY_TPC_19_ALPHA_THERM);
 292         alpha_volt = REG_READ_FIELD(ah, AR_PHY_TPC_19,
 293                                     AR_PHY_TPC_19_ALPHA_VOLT);
 294         therm_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
 295                                          AR_PHY_TPC_18_THERM_CAL_VALUE);
 296         volt_cal_value = REG_READ_FIELD(ah, AR_PHY_TPC_18,
 297                                         AR_PHY_TPC_18_VOLT_CAL_VALUE);
 298         therm_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
 299                                      AR_PHY_BB_THERM_ADC_4_LATEST_THERM_VALUE);
 300         volt_value = REG_READ_FIELD(ah, AR_PHY_BB_THERM_ADC_4,
 301                                     AR_PHY_BB_THERM_ADC_4_LATEST_VOLT_VALUE);
 302
 303         switch (chain) {
 304         case 0:
 305                 reg_olpc = AR_PHY_TPC_11_B0;
 306                 reg_cl_gain = AR_PHY_CL_TAB_0;
 307                 break;
 308         case 1:
 309                 reg_olpc = AR_PHY_TPC_11_B1;
 310                 reg_cl_gain = AR_PHY_CL_TAB_1;
 311                 break;
 312         case 2:
 313                 reg_olpc = AR_PHY_TPC_11_B2;
 314                 reg_cl_gain = AR_PHY_CL_TAB_2;
 315                 break;
 316         default:
 317                 ath_dbg(ath9k_hw_common(ah), CALIBRATE,
 318                         "Invalid chainmask: %d\n", chain);
 319                 break;
 320         }
 321
 322         olpc_gain_delta = REG_READ_FIELD(ah, reg_olpc,
 323                                          AR_PHY_TPC_11_OLPC_GAIN_DELTA);
 324         cl_gain_mod = REG_READ_FIELD(ah, reg_cl_gain,
 325                                          AR_PHY_CL_TAB_CL_GAIN_MOD);
 326
 327         if (olpc_gain_delta >= 128)
 328                 olpc_gain_delta = olpc_gain_delta - 256;
 329
 330         thermal_gain_corr = (alpha_therm * (therm_value - therm_cal_value) +
 331                              (256 / 2)) / 256;
 332         voltage_gain_corr = (alpha_volt * (volt_value - volt_cal_value) +
 333                              (128 / 2)) / 128;
 334         desired_gain = target_power - olpc_gain_delta - thermal_gain_corr -
 335             voltage_gain_corr + desired_scale + cl_gain_mod;
 336
 337         return desired_gain;
 338 }
 339
 340 static void ar9003_tx_force_gain(struct ath_hw *ah, unsigned int gain_index)
 341 {
 342         int selected_gain_entry, txbb1dbgain, txbb6dbgain, txmxrgain;
 343         int padrvgnA, padrvgnB, padrvgnC, padrvgnD;
 344         u32 *gain_table_entries = ah->paprd_gain_table_entries;
 345
 346         selected_gain_entry = gain_table_entries[gain_index];
 347         txbb1dbgain = selected_gain_entry & 0x7;
 348         txbb6dbgain = (selected_gain_entry >> 3) & 0x3;
 349         txmxrgain = (selected_gain_entry >> 5) & 0xf;
 350         padrvgnA = (selected_gain_entry >> 9) & 0xf;
 351         padrvgnB = (selected_gain_entry >> 13) & 0xf;
 352         padrvgnC = (selected_gain_entry >> 17) & 0xf;
 353         padrvgnD = (selected_gain_entry >> 21) & 0x3;
 354
 355         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 356                       AR_PHY_TX_FORCED_GAIN_FORCED_TXBB1DBGAIN, txbb1dbgain);
 357         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 358                       AR_PHY_TX_FORCED_GAIN_FORCED_TXBB6DBGAIN, txbb6dbgain);
 359         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 360                       AR_PHY_TX_FORCED_GAIN_FORCED_TXMXRGAIN, txmxrgain);
 361         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 362                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNA, padrvgnA);
 363         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 364                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNB, padrvgnB);
 365         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 366                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGNC, padrvgnC);
 367         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 368                       AR_PHY_TX_FORCED_GAIN_FORCED_PADRVGND, padrvgnD);
 369         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 370                       AR_PHY_TX_FORCED_GAIN_FORCED_ENABLE_PAL, 0);
 371         REG_RMW_FIELD(ah, AR_PHY_TX_FORCED_GAIN,
 372                       AR_PHY_TX_FORCED_GAIN_FORCE_TX_GAIN, 0);
 373         REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCED_DAC_GAIN, 0);
 374         REG_RMW_FIELD(ah, AR_PHY_TPC_1, AR_PHY_TPC_1_FORCE_DAC_GAIN, 0);
 375 }
 376
 377 static inline int find_expn(int num)
 378 {
 379         return fls(num) - 1;
 380 }
 381
 382 static inline int find_proper_scale(int expn, int N)
 383 {
 384         return (expn > N) ? expn - 10 : 0;
 385 }
 386
 387 #define NUM_BIN 23
 388
 389 static bool create_pa_curve(u32 *data_L, u32 *data_U, u32 *pa_table, u16 *gain)
 390 {
 391         unsigned int thresh_accum_cnt;
 392         int x_est[NUM_BIN + 1], Y[NUM_BIN + 1], theta[NUM_BIN + 1];
 393         int PA_in[NUM_BIN + 1];
 394         int B1_tmp[NUM_BIN + 1], B2_tmp[NUM_BIN + 1];
 395         unsigned int B1_abs_max, B2_abs_max;
 396         int max_index, scale_factor;
 397         int y_est[NUM_BIN + 1];
 398         int x_est_fxp1_nonlin, x_tilde[NUM_BIN + 1];
 399         unsigned int x_tilde_abs;
 400         int G_fxp, Y_intercept, order_x_by_y, M, I, L, sum_y_sqr, sum_y_quad;
 401         int Q_x, Q_B1, Q_B2, beta_raw, alpha_raw, scale_B;
 402         int Q_scale_B, Q_beta, Q_alpha, alpha, beta, order_1, order_2;
 403         int order1_5x, order2_3x, order1_5x_rem, order2_3x_rem;
 404         int y5, y3, tmp;
 405         int theta_low_bin = 0;
 406         int i;
 407
 408         /* disregard any bin that contains <= 16 samples */
 409         thresh_accum_cnt = 16;
 410         scale_factor = 5;
 411         max_index = 0;
 412         memset(theta, 0, sizeof(theta));
 413         memset(x_est, 0, sizeof(x_est));
 414         memset(Y, 0, sizeof(Y));
 415         memset(y_est, 0, sizeof(y_est));
 416         memset(x_tilde, 0, sizeof(x_tilde));
 417
 418         for (i = 0; i < NUM_BIN; i++) {
 419                 s32 accum_cnt, accum_tx, accum_rx, accum_ang;
 420
 421                 /* number of samples */
 422                 accum_cnt = data_L[i] & 0xffff;
 423
 424                 if (accum_cnt <= thresh_accum_cnt)
 425                         continue;
 426
 427                 /* sum(tx amplitude) */
 428                 accum_tx = ((data_L[i] >> 16) & 0xffff) |
 429                     ((data_U[i] & 0x7ff) << 16);
 430
 431                 /* sum(rx amplitude distance to lower bin edge) */
 432                 accum_rx = ((data_U[i] >> 11) & 0x1f) |
 433                     ((data_L[i + 23] & 0xffff) << 5);
 434
 435                 /* sum(angles) */
 436                 accum_ang = ((data_L[i + 23] >> 16) & 0xffff) |
 437                     ((data_U[i + 23] & 0x7ff) << 16);
 438
 439                 accum_tx <<= scale_factor;
 440                 accum_rx <<= scale_factor;
 441                 x_est[i + 1] = (((accum_tx + accum_cnt) / accum_cnt) + 32) >>
 442                     scale_factor;
 443
 444                 Y[i + 1] = ((((accum_rx + accum_cnt) / accum_cnt) + 32) >>
 445                             scale_factor) +
 446                             (1 << scale_factor) * max_index + 16;
 447
 448                 if (accum_ang >= (1 << 26))
 449                         accum_ang -= 1 << 27;
 450
 451                 theta[i + 1] = ((accum_ang * (1 << scale_factor)) + accum_cnt) /
 452                     accum_cnt;
 453
 454                 max_index++;
 455         }
 456
 457         /*
 458          * Find average theta of first 5 bin and all of those to same value.
 459          * Curve is linear at that range.
 460          */
 461         for (i = 1; i < 6; i++)
 462                 theta_low_bin += theta[i];
 463
 464         theta_low_bin = theta_low_bin / 5;
 465         for (i = 1; i < 6; i++)
 466                 theta[i] = theta_low_bin;
 467
 468         /* Set values at origin */
 469         theta[0] = theta_low_bin;
 470         for (i = 0; i <= max_index; i++)
 471                 theta[i] -= theta_low_bin;
 472
 473         x_est[0] = 0;
 474         Y[0] = 0;
 475         scale_factor = 8;
 476
 477         /* low signal gain */
 478         if (x_est[6] == x_est[3])
 479                 return false;
 480
 481         G_fxp =
 482             (((Y[6] - Y[3]) * 1 << scale_factor) +
 483              (x_est[6] - x_est[3])) / (x_est[6] - x_est[3]);
 484
 485         /* prevent division by zero */
 486         if (G_fxp == 0)
 487                 return false;
 488
 489         Y_intercept =
 490             (G_fxp * (x_est[0] - x_est[3]) +
 491              (1 << scale_factor)) / (1 << scale_factor) + Y[3];
 492
 493         for (i = 0; i <= max_index; i++)
 494                 y_est[i] = Y[i] - Y_intercept;
 495
 496         for (i = 0; i <= 3; i++) {
 497                 y_est[i] = i * 32;
 498                 x_est[i] = ((y_est[i] * 1 << scale_factor) + G_fxp) / G_fxp;
 499         }
 500
 501         if (y_est[max_index] == 0)
 502                 return false;
 503
 504         x_est_fxp1_nonlin =
 505             x_est[max_index] - ((1 << scale_factor) * y_est[max_index] +
 506                                 G_fxp) / G_fxp;
 507
 508         order_x_by_y =
 509             (x_est_fxp1_nonlin + y_est[max_index]) / y_est[max_index];
 510
 511         if (order_x_by_y == 0)
 512                 M = 10;
 513         else if (order_x_by_y == 1)
 514                 M = 9;
 515         else
 516                 M = 8;
 517
 518         I = (max_index > 15) ? 7 : max_index >> 1;
 519         L = max_index - I;
 520         scale_factor = 8;
 521         sum_y_sqr = 0;
 522         sum_y_quad = 0;
 523         x_tilde_abs = 0;
 524
 525         for (i = 0; i <= L; i++) {
 526                 unsigned int y_sqr;
 527                 unsigned int y_quad;
 528                 unsigned int tmp_abs;
 529
 530                 /* prevent division by zero */
 531                 if (y_est[i + I] == 0)
 532                         return false;
 533
 534                 x_est_fxp1_nonlin =
 535                     x_est[i + I] - ((1 << scale_factor) * y_est[i + I] +
 536                                     G_fxp) / G_fxp;
 537
 538                 x_tilde[i] =
 539                     (x_est_fxp1_nonlin * (1 << M) + y_est[i + I]) / y_est[i +
 540                                                                           I];
 541                 x_tilde[i] =
 542                     (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
 543                 x_tilde[i] =
 544                     (x_tilde[i] * (1 << M) + y_est[i + I]) / y_est[i + I];
 545                 y_sqr =
 546                     (y_est[i + I] * y_est[i + I] +
 547                      (scale_factor * scale_factor)) / (scale_factor *
 548                                                        scale_factor);
 549                 tmp_abs = abs(x_tilde[i]);
 550                 if (tmp_abs > x_tilde_abs)
 551                         x_tilde_abs = tmp_abs;
 552
 553                 y_quad = y_sqr * y_sqr;
 554                 sum_y_sqr = sum_y_sqr + y_sqr;
 555                 sum_y_quad = sum_y_quad + y_quad;
 556                 B1_tmp[i] = y_sqr * (L + 1);
 557                 B2_tmp[i] = y_sqr;
 558         }
 559
 560         B1_abs_max = 0;
 561         B2_abs_max = 0;
 562         for (i = 0; i <= L; i++) {
 563                 int abs_val;
 564
 565                 B1_tmp[i] -= sum_y_sqr;
 566                 B2_tmp[i] = sum_y_quad - sum_y_sqr * B2_tmp[i];
 567
 568                 abs_val = abs(B1_tmp[i]);
 569                 if (abs_val > B1_abs_max)
 570                         B1_abs_max = abs_val;
 571
 572                 abs_val = abs(B2_tmp[i]);
 573                 if (abs_val > B2_abs_max)
 574                         B2_abs_max = abs_val;
 575         }
 576
 577         Q_x = find_proper_scale(find_expn(x_tilde_abs), 10);
 578         Q_B1 = find_proper_scale(find_expn(B1_abs_max), 10);
 579         Q_B2 = find_proper_scale(find_expn(B2_abs_max), 10);
 580
 581         beta_raw = 0;
 582         alpha_raw = 0;
 583         for (i = 0; i <= L; i++) {
 584                 x_tilde[i] = x_tilde[i] / (1 << Q_x);
 585                 B1_tmp[i] = B1_tmp[i] / (1 << Q_B1);
 586                 B2_tmp[i] = B2_tmp[i] / (1 << Q_B2);
 587                 beta_raw = beta_raw + B1_tmp[i] * x_tilde[i];
 588                 alpha_raw = alpha_raw + B2_tmp[i] * x_tilde[i];
 589         }
 590
 591         scale_B =
 592             ((sum_y_quad / scale_factor) * (L + 1) -
 593              (sum_y_sqr / scale_factor) * sum_y_sqr) * scale_factor;
 594
 595         Q_scale_B = find_proper_scale(find_expn(abs(scale_B)), 10);
 596         scale_B = scale_B / (1 << Q_scale_B);
 597         if (scale_B == 0)
 598                 return false;
 599         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
 600         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
 601         beta_raw = beta_raw / (1 << Q_beta);
 602         alpha_raw = alpha_raw / (1 << Q_alpha);
 603         alpha = (alpha_raw << 10) / scale_B;
 604         beta = (beta_raw << 10) / scale_B;
 605         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B;
 606         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B;
 607         order1_5x = order_1 / 5;
 608         order2_3x = order_2 / 3;
 609         order1_5x_rem = order_1 - 5 * order1_5x;
 610         order2_3x_rem = order_2 - 3 * order2_3x;
 611
 612         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 613                 tmp = i * 32;
 614                 y5 = ((beta * tmp) >> 6) >> order1_5x;
 615                 y5 = (y5 * tmp) >> order1_5x;
 616                 y5 = (y5 * tmp) >> order1_5x;
 617                 y5 = (y5 * tmp) >> order1_5x;
 618                 y5 = (y5 * tmp) >> order1_5x;
 619                 y5 = y5 >> order1_5x_rem;
 620                 y3 = (alpha * tmp) >> order2_3x;
 621                 y3 = (y3 * tmp) >> order2_3x;
 622                 y3 = (y3 * tmp) >> order2_3x;
 623                 y3 = y3 >> order2_3x_rem;
 624                 PA_in[i] = y5 + y3 + (256 * tmp) / G_fxp;
 625
 626                 if (i >= 2) {
 627                         tmp = PA_in[i] - PA_in[i - 1];
 628                         if (tmp < 0)
 629                                 PA_in[i] =
 630                                     PA_in[i - 1] + (PA_in[i - 1] -
 631                                                     PA_in[i - 2]);
 632                 }
 633
 634                 PA_in[i] = (PA_in[i] < 1400) ? PA_in[i] : 1400;
 635         }
 636
 637         beta_raw = 0;
 638         alpha_raw = 0;
 639
 640         for (i = 0; i <= L; i++) {
 641                 int theta_tilde =
 642                     ((theta[i + I] << M) + y_est[i + I]) / y_est[i + I];
 643                 theta_tilde =
 644                     ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
 645                 theta_tilde =
 646                     ((theta_tilde << M) + y_est[i + I]) / y_est[i + I];
 647                 beta_raw = beta_raw + B1_tmp[i] * theta_tilde;
 648                 alpha_raw = alpha_raw + B2_tmp[i] * theta_tilde;
 649         }
 650
 651         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
 652         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
 653         beta_raw = beta_raw / (1 << Q_beta);
 654         alpha_raw = alpha_raw / (1 << Q_alpha);
 655
 656         alpha = (alpha_raw << 10) / scale_B;
 657         beta = (beta_raw << 10) / scale_B;
 658         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B + 5;
 659         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B + 5;
 660         order1_5x = order_1 / 5;
 661         order2_3x = order_2 / 3;
 662         order1_5x_rem = order_1 - 5 * order1_5x;
 663         order2_3x_rem = order_2 - 3 * order2_3x;
 664
 665         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 666                 int PA_angle;
 667
 668                 /* pa_table[4] is calculated from PA_angle for i=5 */
 669                 if (i == 4)
 670                         continue;
 671
 672                 tmp = i * 32;
 673                 if (beta > 0)
 674                         y5 = (((beta * tmp - 64) >> 6) -
 675                               (1 << order1_5x)) / (1 << order1_5x);
 676                 else
 677                         y5 = ((((beta * tmp - 64) >> 6) +
 678                                (1 << order1_5x)) / (1 << order1_5x));
 679
 680                 y5 = (y5 * tmp) / (1 << order1_5x);
 681                 y5 = (y5 * tmp) / (1 << order1_5x);
 682                 y5 = (y5 * tmp) / (1 << order1_5x);
 683                 y5 = (y5 * tmp) / (1 << order1_5x);
 684                 y5 = y5 / (1 << order1_5x_rem);
 685
 686                 if (beta > 0)
 687                         y3 = (alpha * tmp -
 688                               (1 << order2_3x)) / (1 << order2_3x);
 689                 else
 690                         y3 = (alpha * tmp +
 691                               (1 << order2_3x)) / (1 << order2_3x);
 692                 y3 = (y3 * tmp) / (1 << order2_3x);
 693                 y3 = (y3 * tmp) / (1 << order2_3x);
 694                 y3 = y3 / (1 << order2_3x_rem);
 695
 696                 if (i < 4) {
 697                         PA_angle = 0;
 698                 } else {
 699                         PA_angle = y5 + y3;
 700                         if (PA_angle < -150)
 701                                 PA_angle = -150;
 702                         else if (PA_angle > 150)
 703                                 PA_angle = 150;
 704                 }
 705
 706                 pa_table[i] = ((PA_in[i] & 0x7ff) << 11) + (PA_angle & 0x7ff);
 707                 if (i == 5) {
 708                         PA_angle = (PA_angle + 2) >> 1;
 709                         pa_table[i - 1] = ((PA_in[i - 1] & 0x7ff) << 11) +
 710                             (PA_angle & 0x7ff);
 711                 }
 712         }
 713
 714         *gain = G_fxp;
 715         return true;
 716 }
 717
 718 void ar9003_paprd_populate_single_table(struct ath_hw *ah,
 719                                         struct ath9k_hw_cal_data *caldata,
 720                                         int chain)
 721 {
 722         u32 *paprd_table_val = caldata->pa_table[chain];
 723         u32 small_signal_gain = caldata->small_signal_gain[chain];
 724         u32 training_power = ah->paprd_training_power;
 725         u32 reg = 0;
 726         int i;
 727
 728         if (chain == 0)
 729                 reg = AR_PHY_PAPRD_MEM_TAB_B0;
 730         else if (chain == 1)
 731                 reg = AR_PHY_PAPRD_MEM_TAB_B1;
 732         else if (chain == 2)
 733                 reg = AR_PHY_PAPRD_MEM_TAB_B2;
 734
 735         for (i = 0; i < PAPRD_TABLE_SZ; i++) {
 736                 REG_WRITE(ah, reg, paprd_table_val[i]);
 737                 reg = reg + 4;
 738         }
 739
 740         if (chain == 0)
 741                 reg = AR_PHY_PA_GAIN123_B0;
 742         else if (chain == 1)
 743                 reg = AR_PHY_PA_GAIN123_B1;
 744         else
 745                 reg = AR_PHY_PA_GAIN123_B2;
 746
 747         REG_RMW_FIELD(ah, reg, AR_PHY_PA_GAIN123_PA_GAIN1, small_signal_gain);
 748
 749         REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B0,
 750                       AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 751                       training_power);
 752
 753         if (ah->caps.tx_chainmask & BIT(1))
 754                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B1,
 755                               AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 756                               training_power);
 757
 758         if (ah->caps.tx_chainmask & BIT(2))
 759                 /* val AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL correct? */
 760                 REG_RMW_FIELD(ah, AR_PHY_PAPRD_CTRL1_B2,
 761                               AR_PHY_PAPRD_CTRL1_PAPRD_POWER_AT_AM2AM_CAL,
 762                               training_power);
 763 }
 764 EXPORT_SYMBOL(ar9003_paprd_populate_single_table);
 765
 766 int ar9003_paprd_setup_gain_table(struct ath_hw *ah, int chain)
 767 {
 768         unsigned int i, desired_gain, gain_index;
 769         unsigned int train_power = ah->paprd_training_power;
 770
 771         desired_gain = ar9003_get_desired_gain(ah, chain, train_power);
 772
 773         gain_index = 0;
 774         for (i = 0; i < PAPRD_GAIN_TABLE_ENTRIES; i++) {
 775                 if (ah->paprd_gain_table_index[i] >= desired_gain)
 776                         break;
 777                 gain_index++;
 778         }
 779
 780         ar9003_tx_force_gain(ah, gain_index);
 781
 782         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 783                         AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 784
 785         return 0;
 786 }
 787 EXPORT_SYMBOL(ar9003_paprd_setup_gain_table);
 788
 789 static bool ar9003_paprd_retrain_pa_in(struct ath_hw *ah,
 790                                        struct ath9k_hw_cal_data *caldata,
 791                                        int chain)
 792 {
 793         u32 *pa_in = caldata->pa_table[chain];
 794         int capdiv_offset, quick_drop_offset;
 795         int capdiv2g, quick_drop;
 796         int count = 0;
 797         int i;
 798
 799         if (!AR_SREV_9485(ah) && !AR_SREV_9330(ah))
 800                 return false;
 801
 802         capdiv2g = REG_READ_FIELD(ah, AR_PHY_65NM_CH0_TXRF3,
 803                                   AR_PHY_65NM_CH0_TXRF3_CAPDIV2G);
 804
 805         quick_drop = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 806                                     AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP);
 807
 808         if (quick_drop)
 809                 quick_drop -= 0x40;
 810
 811         for (i = 0; i < NUM_BIN + 1; i++) {
 812                 if (pa_in[i] == 1400)
 813                         count++;
 814         }
 815
 816         if (AR_SREV_9485(ah)) {
 817                 if (pa_in[23] < 800) {
 818                         capdiv_offset = (int)((1000 - pa_in[23] + 75) / 150);
 819                         capdiv2g += capdiv_offset;
 820                         if (capdiv2g > 7) {
 821                                 capdiv2g = 7;
 822                                 if (pa_in[23] < 600) {
 823                                         quick_drop++;
 824                                         if (quick_drop > 0)
 825                                                 quick_drop = 0;
 826                                 }
 827                         }
 828                 } else if (pa_in[23] == 1400) {
 829                         quick_drop_offset = min_t(int, count / 3, 2);
 830                         quick_drop += quick_drop_offset;
 831                         capdiv2g += quick_drop_offset / 2;
 832
 833                         if (capdiv2g > 7)
 834                                 capdiv2g = 7;
 835
 836                         if (quick_drop > 0) {
 837                                 quick_drop = 0;
 838                                 capdiv2g -= quick_drop_offset;
 839                                 if (capdiv2g < 0)
 840                                         capdiv2g = 0;
 841                         }
 842                 } else {
 843                         return false;
 844                 }
 845         } else if (AR_SREV_9330(ah)) {
 846                 if (pa_in[23] < 1000) {
 847                         capdiv_offset = (1000 - pa_in[23]) / 100;
 848                         capdiv2g += capdiv_offset;
 849                         if (capdiv_offset > 3) {
 850                                 capdiv_offset = 1;
 851                                 quick_drop--;
 852                         }
 853
 854                         capdiv2g += capdiv_offset;
 855                         if (capdiv2g > 6)
 856                                 capdiv2g = 6;
 857                         if (quick_drop < -4)
 858                                 quick_drop = -4;
 859                 } else if (pa_in[23] == 1400) {
 860                         if (count > 3) {
 861                                 quick_drop++;
 862                                 capdiv2g -= count / 4;
 863                                 if (quick_drop > -2)
 864                                         quick_drop = -2;
 865                         } else {
 866                                 capdiv2g--;
 867                         }
 868
 869                         if (capdiv2g < 0)
 870                                 capdiv2g = 0;
 871                 } else {
 872                         return false;
 873                 }
 874         }
 875
 876         REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_TXRF3,
 877                       AR_PHY_65NM_CH0_TXRF3_CAPDIV2G, capdiv2g);
 878         REG_RMW_FIELD(ah, AR_PHY_PAPRD_TRAINER_CNTL3,
 879                       AR_PHY_PAPRD_TRAINER_CNTL3_CF_PAPRD_QUICK_DROP,
 880                       quick_drop);
 881
 882         return true;
 883 }
 884
 885 int ar9003_paprd_create_curve(struct ath_hw *ah,
 886                               struct ath9k_hw_cal_data *caldata, int chain)
 887 {
 888         u16 *small_signal_gain = &caldata->small_signal_gain[chain];
 889         u32 *pa_table = caldata->pa_table[chain];
 890         u32 *data_L, *data_U;
 891         int i, status = 0;
 892         u32 *buf;
 893         u32 reg;
 894
 895         memset(caldata->pa_table[chain], 0, sizeof(caldata->pa_table[chain]));
 896
 897         buf = kmalloc(2 * 48 * sizeof(u32), GFP_ATOMIC);
 898         if (!buf)
 899                 return -ENOMEM;
 900
 901         data_L = &buf[0];
 902         data_U = &buf[48];
 903
 904         REG_CLR_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
 905                     AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);
 906
 907         reg = AR_PHY_CHAN_INFO_TAB_0;
 908         for (i = 0; i < 48; i++)
 909                 data_L[i] = REG_READ(ah, reg + (i << 2));
 910
 911         REG_SET_BIT(ah, AR_PHY_CHAN_INFO_MEMORY,
 912                     AR_PHY_CHAN_INFO_MEMORY_CHANINFOMEM_S2_READ);
 913
 914         for (i = 0; i < 48; i++)
 915                 data_U[i] = REG_READ(ah, reg + (i << 2));
 916
 917         if (!create_pa_curve(data_L, data_U, pa_table, small_signal_gain))
 918                 status = -2;
 919
 920         if (ar9003_paprd_retrain_pa_in(ah, caldata, chain))
 921                 status = -EINPROGRESS;
 922
 923         REG_CLR_BIT(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 924                     AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 925
 926         kfree(buf);
 927
 928         return status;
 929 }
 930 EXPORT_SYMBOL(ar9003_paprd_create_curve);
 931
 932 int ar9003_paprd_init_table(struct ath_hw *ah)
 933 {
 934         int ret;
 935
 936         ret = ar9003_paprd_setup_single_table(ah);
 937         if (ret < 0)
 938             return ret;
 939
 940         ar9003_paprd_get_gain_table(ah);
 941         return 0;
 942 }
 943 EXPORT_SYMBOL(ar9003_paprd_init_table);
 944
 945 bool ar9003_paprd_is_done(struct ath_hw *ah)
 946 {
 947         int paprd_done, agc2_pwr;
 948         paprd_done = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 949                                 AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 950
 951         if (paprd_done == 0x1) {
 952                 agc2_pwr = REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
 953                                 AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_AGC2_PWR);
 954
 955                 ath_dbg(ath9k_hw_common(ah), CALIBRATE,
 956                         "AGC2_PWR = 0x%x training done = 0x%x\n",
 957                         agc2_pwr, paprd_done);
 958         /*
 959          * agc2_pwr range should not be less than 'IDEAL_AGC2_PWR_CHANGE'
 960          * when the training is completely done, otherwise retraining is
 961          * done to make sure the value is in ideal range
 962          */
 963                 if (agc2_pwr <= PAPRD_IDEAL_AGC2_PWR_RANGE)
 964                         paprd_done = 0;
 965         }
 966
 967         return !!paprd_done;
 968 }
 969 EXPORT_SYMBOL(ar9003_paprd_is_done);