drivers/net/wireless/iwlwifi/iwl-power.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2007 - 2010 Intel Corporation. All rights reserved.
   4  *
   5  * Portions of this file are derived from the ipw3945 project, as well
   6  * as portions of the ieee80211 subsystem header files.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  20  *
  21  * The full GNU General Public License is included in this distribution in the
  22  * file called LICENSE.
  23  *
  24  * Contact Information:
  25  *  Intel Linux Wireless <ilw@linux.intel.com>
  26  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  27  *****************************************************************************/
  28
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/slab.h>
  33 #include <linux/init.h>
  34
  35 #include <net/mac80211.h>
  36
  37 #include "iwl-eeprom.h"
  38 #include "iwl-dev.h"
  39 #include "iwl-core.h"
  40 #include "iwl-io.h"
  41 #include "iwl-commands.h"
  42 #include "iwl-debug.h"
  43 #include "iwl-power.h"
  44
  45 /*
  46  * Setting power level allows the card to go to sleep when not busy.
  47  *
  48  * We calculate a sleep command based on the required latency, which
  49  * we get from mac80211. In order to handle thermal throttling, we can
  50  * also use pre-defined power levels.
  51  */
  52
  53 /*
  54  * For now, keep using power level 1 instead of automatically
  55  * adjusting ...
  56  */
  57 bool no_sleep_autoadjust = true;
  58 module_param(no_sleep_autoadjust, bool, S_IRUGO);
  59 MODULE_PARM_DESC(no_sleep_autoadjust,
  60                  "don't automatically adjust sleep level "
  61                  "according to maximum network latency");
  62
  63 /*
  64  * This defines the old power levels. They are still used by default
  65  * (level 1) and for thermal throttle (levels 3 through 5)
  66  */
  67
  68 struct iwl_power_vec_entry {
  69         struct iwl_powertable_cmd cmd;
  70         u8 no_dtim;     /* number of skip dtim */
  71 };
  72
  73 #define IWL_DTIM_RANGE_0_MAX    2
  74 #define IWL_DTIM_RANGE_1_MAX    10
  75
  76 #define NOSLP cpu_to_le16(0), 0, 0
  77 #define SLP IWL_POWER_DRIVER_ALLOW_SLEEP_MSK, 0, 0
  78 #define ASLP (IWL_POWER_POWER_SAVE_ENA_MSK |    \
  79                 IWL_POWER_POWER_MANAGEMENT_ENA_MSK | \
  80                 IWL_POWER_ADVANCE_PM_ENA_MSK)
  81 #define ASLP_TOUT(T) cpu_to_le32(T)
  82 #define TU_TO_USEC 1024
  83 #define SLP_TOUT(T) cpu_to_le32((T) * TU_TO_USEC)
  84 #define SLP_VEC(X0, X1, X2, X3, X4) {cpu_to_le32(X0), \
  85                                      cpu_to_le32(X1), \
  86                                      cpu_to_le32(X2), \
  87                                      cpu_to_le32(X3), \
  88                                      cpu_to_le32(X4)}
  89 /* default power management (not Tx power) table values */
  90 /* for DTIM period 0 through IWL_DTIM_RANGE_0_MAX */
  91 /* DTIM 0 - 2 */
  92 static const struct iwl_power_vec_entry range_0[IWL_POWER_NUM] = {
  93         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 1, 2, 2, 0xFF)}, 0},
  94         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 2, 2, 0xFF)}, 0},
  95         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 2, 2, 2, 0xFF)}, 0},
  96         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 2, 4, 4, 0xFF)}, 1},
  97         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 2, 4, 6, 0xFF)}, 2}
  98 };
  99
 100
 101 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
 102 /* DTIM 3 - 10 */
 103 static const struct iwl_power_vec_entry range_1[IWL_POWER_NUM] = {
 104         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 4)}, 0},
 105         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(1, 2, 3, 4, 7)}, 0},
 106         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 4, 6, 7, 9)}, 0},
 107         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 4, 6, 9, 10)}, 1},
 108         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(2, 4, 6, 10, 10)}, 2}
 109 };
 110
 111 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 112 /* DTIM 11 - */
 113 static const struct iwl_power_vec_entry range_2[IWL_POWER_NUM] = {
 114         {{SLP, SLP_TOUT(200), SLP_TOUT(500), SLP_VEC(1, 2, 3, 4, 0xFF)}, 0},
 115         {{SLP, SLP_TOUT(200), SLP_TOUT(300), SLP_VEC(2, 4, 6, 7, 0xFF)}, 0},
 116         {{SLP, SLP_TOUT(50), SLP_TOUT(100), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 117         {{SLP, SLP_TOUT(50), SLP_TOUT(25), SLP_VEC(2, 7, 9, 9, 0xFF)}, 0},
 118         {{SLP, SLP_TOUT(25), SLP_TOUT(25), SLP_VEC(4, 7, 10, 10, 0xFF)}, 0}
 119 };
 120
 121 /* advance power management */
 122 /* DTIM 0 - 2 */
 123 static const struct iwl_power_vec_entry apm_range_0[IWL_POWER_NUM] = {
 124         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 125                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 126         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 127                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 128         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 129                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 130         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 131                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 132         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 133                 SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 134 };
 135
 136
 137 /* for DTIM period IWL_DTIM_RANGE_0_MAX + 1 through IWL_DTIM_RANGE_1_MAX */
 138 /* DTIM 3 - 10 */
 139 static const struct iwl_power_vec_entry apm_range_1[IWL_POWER_NUM] = {
 140         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 141                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 142         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 143                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 144         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 145                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 146         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 147                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 148         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 149                 SLP_VEC(1, 2, 6, 8, 0xFF), 0}, 2}
 150 };
 151
 152 /* for DTIM period > IWL_DTIM_RANGE_1_MAX */
 153 /* DTIM 11 - */
 154 static const struct iwl_power_vec_entry apm_range_2[IWL_POWER_NUM] = {
 155         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 156                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 157         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 158                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 159         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 160                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 161         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 162                 SLP_VEC(1, 2, 4, 6, 0xFF), 0}, 0},
 163         {{ASLP, 0, 0, ASLP_TOUT(50), ASLP_TOUT(50),
 164                 SLP_VEC(1, 2, 6, 8, 0xFF), ASLP_TOUT(2)}, 2}
 165 };
 166
 167 static void iwl_static_sleep_cmd(struct iwl_priv *priv,
 168                                  struct iwl_powertable_cmd *cmd,
 169                                  enum iwl_power_level lvl, int period)
 170 {
 171         const struct iwl_power_vec_entry *table;
 172         int max_sleep[IWL_POWER_VEC_SIZE] = { 0 };
 173         int i;
 174         u8 skip;
 175         u32 slp_itrvl;
 176
 177         if (priv->cfg->adv_pm) {
 178                 table = apm_range_2;
 179                 if (period <= IWL_DTIM_RANGE_1_MAX)
 180                         table = apm_range_1;
 181                 if (period <= IWL_DTIM_RANGE_0_MAX)
 182                         table = apm_range_0;
 183         } else {
 184                 table = range_2;
 185                 if (period <= IWL_DTIM_RANGE_1_MAX)
 186                         table = range_1;
 187                 if (period <= IWL_DTIM_RANGE_0_MAX)
 188                         table = range_0;
 189         }
 190
 191         BUG_ON(lvl < 0 || lvl >= IWL_POWER_NUM);
 192
 193         *cmd = table[lvl].cmd;
 194
 195         if (period == 0) {
 196                 skip = 0;
 197                 period = 1;
 198                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 199                         max_sleep[i] =  1;
 200
 201         } else {
 202                 skip = table[lvl].no_dtim;
 203                 for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 204                         max_sleep[i] = le32_to_cpu(cmd->sleep_interval[i]);
 205                 max_sleep[IWL_POWER_VEC_SIZE - 1] = skip + 1;
 206         }
 207
 208         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 209         /* figure out the listen interval based on dtim period and skip */
 210         if (slp_itrvl == 0xFF)
 211                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 212                         cpu_to_le32(period * (skip + 1));
 213
 214         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 215         if (slp_itrvl > period)
 216                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 217                         cpu_to_le32((slp_itrvl / period) * period);
 218
 219         if (skip)
 220                 cmd->flags |= IWL_POWER_SLEEP_OVER_DTIM_MSK;
 221         else
 222                 cmd->flags &= ~IWL_POWER_SLEEP_OVER_DTIM_MSK;
 223
 224         if (priv->cfg->base_params->shadow_reg_enable)
 225                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 226         else
 227                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 228
 229         if (iwl_advanced_bt_coexist(priv)) {
 230                 if (!priv->cfg->bt_params->bt_sco_disable)
 231                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 232                 else
 233                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 234         }
 235
 236
 237         slp_itrvl = le32_to_cpu(cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1]);
 238         if (slp_itrvl > IWL_CONN_MAX_LISTEN_INTERVAL)
 239                 cmd->sleep_interval[IWL_POWER_VEC_SIZE - 1] =
 240                         cpu_to_le32(IWL_CONN_MAX_LISTEN_INTERVAL);
 241
 242         /* enforce max sleep interval */
 243         for (i = IWL_POWER_VEC_SIZE - 1; i >= 0 ; i--) {
 244                 if (le32_to_cpu(cmd->sleep_interval[i]) >
 245                     (max_sleep[i] * period))
 246                         cmd->sleep_interval[i] =
 247                                 cpu_to_le32(max_sleep[i] * period);
 248                 if (i != (IWL_POWER_VEC_SIZE - 1)) {
 249                         if (le32_to_cpu(cmd->sleep_interval[i]) >
 250                             le32_to_cpu(cmd->sleep_interval[i+1]))
 251                                 cmd->sleep_interval[i] =
 252                                         cmd->sleep_interval[i+1];
 253                 }
 254         }
 255
 256         if (priv->power_data.pci_pm)
 257                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 258         else
 259                 cmd->flags &= ~IWL_POWER_PCI_PM_MSK;
 260
 261         IWL_DEBUG_POWER(priv, "numSkipDtim = %u, dtimPeriod = %d\n",
 262                         skip, period);
 263         IWL_DEBUG_POWER(priv, "Sleep command for index %d\n", lvl + 1);
 264 }
 265
 266 static void iwl_power_sleep_cam_cmd(struct iwl_priv *priv,
 267                                     struct iwl_powertable_cmd *cmd)
 268 {
 269         memset(cmd, 0, sizeof(*cmd));
 270
 271         if (priv->power_data.pci_pm)
 272                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 273
 274         IWL_DEBUG_POWER(priv, "Sleep command for CAM\n");
 275 }
 276
 277 static void iwl_power_fill_sleep_cmd(struct iwl_priv *priv,
 278                                      struct iwl_powertable_cmd *cmd,
 279                                      int dynps_ms, int wakeup_period)
 280 {
 281         /*
 282          * These are the original power level 3 sleep successions. The
 283          * device may behave better with such succession and was also
 284          * only tested with that. Just like the original sleep commands,
 285          * also adjust the succession here to the wakeup_period below.
 286          * The ranges are the same as for the sleep commands, 0-2, 3-9
 287          * and >10, which is selected based on the DTIM interval for
 288          * the sleep index but here we use the wakeup period since that
 289          * is what we need to do for the latency requirements.
 290          */
 291         static const u8 slp_succ_r0[IWL_POWER_VEC_SIZE] = { 2, 2, 2, 2, 2 };
 292         static const u8 slp_succ_r1[IWL_POWER_VEC_SIZE] = { 2, 4, 6, 7, 9 };
 293         static const u8 slp_succ_r2[IWL_POWER_VEC_SIZE] = { 2, 7, 9, 9, 0xFF };
 294         const u8 *slp_succ = slp_succ_r0;
 295         int i;
 296
 297         if (wakeup_period > IWL_DTIM_RANGE_0_MAX)
 298                 slp_succ = slp_succ_r1;
 299         if (wakeup_period > IWL_DTIM_RANGE_1_MAX)
 300                 slp_succ = slp_succ_r2;
 301
 302         memset(cmd, 0, sizeof(*cmd));
 303
 304         cmd->flags = IWL_POWER_DRIVER_ALLOW_SLEEP_MSK |
 305                      IWL_POWER_FAST_PD; /* no use seeing frames for others */
 306
 307         if (priv->power_data.pci_pm)
 308                 cmd->flags |= IWL_POWER_PCI_PM_MSK;
 309
 310         if (priv->cfg->base_params->shadow_reg_enable)
 311                 cmd->flags |= IWL_POWER_SHADOW_REG_ENA;
 312         else
 313                 cmd->flags &= ~IWL_POWER_SHADOW_REG_ENA;
 314
 315         if (iwl_advanced_bt_coexist(priv)) {
 316                 if (!priv->cfg->bt_params->bt_sco_disable)
 317                         cmd->flags |= IWL_POWER_BT_SCO_ENA;
 318                 else
 319                         cmd->flags &= ~IWL_POWER_BT_SCO_ENA;
 320         }
 321
 322         cmd->rx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 323         cmd->tx_data_timeout = cpu_to_le32(1000 * dynps_ms);
 324
 325         for (i = 0; i < IWL_POWER_VEC_SIZE; i++)
 326                 cmd->sleep_interval[i] =
 327                         cpu_to_le32(min_t(int, slp_succ[i], wakeup_period));
 328
 329         IWL_DEBUG_POWER(priv, "Automatic sleep command\n");
 330 }
 331
 332 static int iwl_set_power(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd)
 333 {
 334         IWL_DEBUG_POWER(priv, "Sending power/sleep command\n");
 335         IWL_DEBUG_POWER(priv, "Flags value = 0x%08X\n", cmd->flags);
 336         IWL_DEBUG_POWER(priv, "Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
 337         IWL_DEBUG_POWER(priv, "Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
 338         IWL_DEBUG_POWER(priv, "Sleep interval vector = { %d , %d , %d , %d , %d }\n",
 339                         le32_to_cpu(cmd->sleep_interval[0]),
 340                         le32_to_cpu(cmd->sleep_interval[1]),
 341                         le32_to_cpu(cmd->sleep_interval[2]),
 342                         le32_to_cpu(cmd->sleep_interval[3]),
 343                         le32_to_cpu(cmd->sleep_interval[4]));
 344
 345         return iwl_send_cmd_pdu(priv, POWER_TABLE_CMD,
 346                                 sizeof(struct iwl_powertable_cmd), cmd);
 347 }
 348
 349 static void iwl_power_build_cmd(struct iwl_priv *priv,
 350                                 struct iwl_powertable_cmd *cmd)
 351 {
 352         bool enabled = priv->hw->conf.flags & IEEE80211_CONF_PS;
 353         int dtimper;
 354
 355         dtimper = priv->hw->conf.ps_dtim_period ?: 1;
 356
 357         if (priv->cfg->base_params->broken_powersave)
 358                 iwl_power_sleep_cam_cmd(priv, cmd);
 359         else if (priv->cfg->base_params->supports_idle &&
 360                  priv->hw->conf.flags & IEEE80211_CONF_IDLE)
 361                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_5, 20);
 362         else if (priv->cfg->ops->lib->tt_ops.lower_power_detection &&
 363                  priv->cfg->ops->lib->tt_ops.tt_power_mode &&
 364                  priv->cfg->ops->lib->tt_ops.lower_power_detection(priv)) {
 365                 /* in thermal throttling low power state */
 366                 iwl_static_sleep_cmd(priv, cmd,
 367                     priv->cfg->ops->lib->tt_ops.tt_power_mode(priv), dtimper);
 368         } else if (!enabled)
 369                 iwl_power_sleep_cam_cmd(priv, cmd);
 370         else if (priv->power_data.debug_sleep_level_override >= 0)
 371                 iwl_static_sleep_cmd(priv, cmd,
 372                                      priv->power_data.debug_sleep_level_override,
 373                                      dtimper);
 374         else if (no_sleep_autoadjust)
 375                 iwl_static_sleep_cmd(priv, cmd, IWL_POWER_INDEX_1, dtimper);
 376         else
 377                 iwl_power_fill_sleep_cmd(priv, cmd,
 378                                          priv->hw->conf.dynamic_ps_timeout,
 379                                          priv->hw->conf.max_sleep_period);
 380 }
 381
 382 int iwl_power_set_mode(struct iwl_priv *priv, struct iwl_powertable_cmd *cmd,
 383                        bool force)
 384 {
 385         int ret;
 386         bool update_chains;
 387
 388         lockdep_assert_held(&priv->mutex);
 389
 390         /* Don't update the RX chain when chain noise calibration is running */
 391         update_chains = priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE ||
 392                         priv->chain_noise_data.state == IWL_CHAIN_NOISE_ALIVE;
 393
 394         if (!memcmp(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
 395                 return 0;
 396
 397         if (!iwl_is_ready_rf(priv))
 398                 return -EIO;
 399
 400         /* scan complete use sleep_power_next, need to be updated */
 401         memcpy(&priv->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
 402         if (test_bit(STATUS_SCANNING, &priv->status) && !force) {
 403                 IWL_DEBUG_INFO(priv, "Defer power set mode while scanning\n");
 404                 return 0;
 405         }
 406
 407         if (cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK)
 408                 set_bit(STATUS_POWER_PMI, &priv->status);
 409
 410         ret = iwl_set_power(priv, cmd);
 411         if (!ret) {
 412                 if (!(cmd->flags & IWL_POWER_DRIVER_ALLOW_SLEEP_MSK))
 413                         clear_bit(STATUS_POWER_PMI, &priv->status);
 414
 415                 if (priv->cfg->ops->lib->update_chain_flags && update_chains)
 416                         priv->cfg->ops->lib->update_chain_flags(priv);
 417                 else if (priv->cfg->ops->lib->update_chain_flags)
 418                         IWL_DEBUG_POWER(priv,
 419                                         "Cannot update the power, chain noise "
 420                                         "calibration running: %d\n",
 421                                         priv->chain_noise_data.state);
 422
 423                 memcpy(&priv->power_data.sleep_cmd, cmd, sizeof(*cmd));
 424         } else
 425                 IWL_ERR(priv, "set power fail, ret = %d", ret);
 426
 427         return ret;
 428 }
 429 EXPORT_SYMBOL(iwl_power_set_mode);
 430
 431 int iwl_power_update_mode(struct iwl_priv *priv, bool force)
 432 {
 433         struct iwl_powertable_cmd cmd;
 434
 435         iwl_power_build_cmd(priv, &cmd);
 436         return iwl_power_set_mode(priv, &cmd, force);
 437 }
 438 EXPORT_SYMBOL(iwl_power_update_mode);
 439
 440 /* initialize to default */
 441 void iwl_power_initialize(struct iwl_priv *priv)
 442 {
 443         u16 lctl = iwl_pcie_link_ctl(priv);
 444
 445         priv->power_data.pci_pm = !(lctl & PCI_CFG_LINK_CTRL_VAL_L0S_EN);
 446
 447         priv->power_data.debug_sleep_level_override = -1;
 448
 449         memset(&priv->power_data.sleep_cmd, 0,
 450                 sizeof(priv->power_data.sleep_cmd));
 451 }
 452 EXPORT_SYMBOL(iwl_power_initialize);