drivers/net/wireless/iwlwifi/mvm/power.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  22  * USA
  23  *
  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
  26  *
  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  30  *
  31  * BSD LICENSE
  32  *
  33  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
  34  * All rights reserved.
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  *
  40  *  * Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  *  * Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in
  44  *    the documentation and/or other materials provided with the
  45  *    distribution.
  46  *  * Neither the name Intel Corporation nor the names of its
  47  *    contributors may be used to endorse or promote products derived
  48  *    from this software without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  51  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  52  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  53  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  54  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  55  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  56  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  57  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  58  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  59  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  61  *
  62  *****************************************************************************/
  63
  64 #include <linux/kernel.h>
  65 #include <linux/module.h>
  66 #include <linux/slab.h>
  67 #include <linux/init.h>
  68
  69 #include <net/mac80211.h>
  70
  71 #include "iwl-debug.h"
  72 #include "mvm.h"
  73 #include "iwl-modparams.h"
  74 #include "fw-api-power.h"
  75
  76 #define POWER_KEEP_ALIVE_PERIOD_SEC    25
  77
  78 static void iwl_power_build_cmd(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
  79                                 struct iwl_powertable_cmd *cmd)
  80 {
  81         struct ieee80211_hw *hw = mvm->hw;
  82         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
  83         struct ieee80211_chanctx_conf *chanctx_conf;
  84         struct ieee80211_channel *chan;
  85         int dtimper, dtimper_msec;
  86         int keep_alive;
  87         bool radar_detect = false;
  88
  89         cmd->id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
  90                                                             mvmvif->color));
  91         cmd->action = cpu_to_le32(FW_CTXT_ACTION_MODIFY);
  92
  93         if ((!vif->bss_conf.ps) ||
  94             (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM))
  95                 return;
  96
  97         cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK);
  98
  99         dtimper = hw->conf.ps_dtim_period ?: 1;
 100
 101         /* Check if radar detection is required on current channel */
 102         rcu_read_lock();
 103         chanctx_conf = rcu_dereference(vif->chanctx_conf);
 104         WARN_ON(!chanctx_conf);
 105         if (chanctx_conf) {
 106                 chan = chanctx_conf->def.chan;
 107                 radar_detect = chan->flags & IEEE80211_CHAN_RADAR;
 108         }
 109         rcu_read_unlock();
 110
 111         /* Check skip over DTIM conditions */
 112         if (!radar_detect && (dtimper <= 10) &&
 113             (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_LP)) {
 114                 cmd->flags |= cpu_to_le16(POWER_FLAGS_SLEEP_OVER_DTIM_MSK);
 115                 cmd->num_skip_dtim = 2;
 116         }
 117
 118         /* Check that keep alive period is at least 3 * DTIM */
 119         dtimper_msec = dtimper * vif->bss_conf.beacon_int;
 120         keep_alive = max_t(int, 3 * dtimper_msec,
 121                            MSEC_PER_SEC * POWER_KEEP_ALIVE_PERIOD_SEC);
 122         keep_alive = DIV_ROUND_UP(keep_alive, MSEC_PER_SEC);
 123
 124         cmd->keep_alive_seconds = cpu_to_le16(keep_alive);
 125
 126         if (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_LP) {
 127                 /* TODO: Also for D3 (device sleep / WoWLAN) */
 128                 cmd->rx_data_timeout = cpu_to_le32(10);
 129                 cmd->tx_data_timeout = cpu_to_le32(10);
 130         } else {
 131                 cmd->rx_data_timeout = cpu_to_le32(50);
 132                 cmd->tx_data_timeout = cpu_to_le32(50);
 133         }
 134 }
 135
 136 int iwl_mvm_power_update_mode(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 137 {
 138         struct iwl_powertable_cmd cmd = {};
 139
 140         if (!iwlwifi_mod_params.power_save) {
 141                 IWL_DEBUG_POWER(mvm, "Power management is not allowed\n");
 142                 return 0;
 143         }
 144
 145         if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
 146                 return 0;
 147
 148         iwl_power_build_cmd(mvm, vif, &cmd);
 149
 150         IWL_DEBUG_POWER(mvm,
 151                         "Sending power table command on mac id 0x%X for power level %d, flags = 0x%X\n",
 152                         cmd.id_and_color, iwlmvm_mod_params.power_scheme,
 153                         le16_to_cpu(cmd.flags));
 154
 155         if (cmd.flags & cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK)) {
 156                 IWL_DEBUG_POWER(mvm, "Keep alive = %u sec\n",
 157                                 le16_to_cpu(cmd.keep_alive_seconds));
 158                 IWL_DEBUG_POWER(mvm, "Rx timeout = %u usec\n",
 159                                 le32_to_cpu(cmd.rx_data_timeout));
 160                 IWL_DEBUG_POWER(mvm, "Tx timeout = %u usec\n",
 161                                 le32_to_cpu(cmd.tx_data_timeout));
 162                 IWL_DEBUG_POWER(mvm, "Rx timeout (uAPSD) = %u usec\n",
 163                                 le32_to_cpu(cmd.rx_data_timeout_uapsd));
 164                 IWL_DEBUG_POWER(mvm, "Tx timeout = %u usec\n",
 165                                 le32_to_cpu(cmd.tx_data_timeout_uapsd));
 166                 IWL_DEBUG_POWER(mvm, "LP RX RSSI threshold = %u\n",
 167                                 cmd.lprx_rssi_threshold);
 168                 IWL_DEBUG_POWER(mvm, "DTIMs to skip = %u\n", cmd.num_skip_dtim);
 169         }
 170
 171         return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_SYNC,
 172                                     sizeof(cmd), &cmd);
 173 }
 174
 175 int iwl_mvm_power_disable(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 176 {
 177         struct iwl_powertable_cmd cmd = {};
 178         struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
 179
 180         if (!iwlwifi_mod_params.power_save) {
 181                 IWL_DEBUG_POWER(mvm, "Power management is not allowed\n");
 182                 return 0;
 183         }
 184
 185         if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
 186                 return 0;
 187
 188         cmd.id_and_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mvmvif->id,
 189                                                             mvmvif->color));
 190         cmd.action = cpu_to_le32(FW_CTXT_ACTION_MODIFY);
 191
 192         IWL_DEBUG_POWER(mvm,
 193                         "Sending power table command on mac id 0x%X for power level %d, flags = 0x%X\n",
 194                         cmd.id_and_color, iwlmvm_mod_params.power_scheme,
 195                         le16_to_cpu(cmd.flags));
 196
 197         return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_ASYNC,
 198                                     sizeof(cmd), &cmd);
 199 }
 200
 201 #ifdef CONFIG_IWLWIFI_DEBUGFS
 202 void iwl_power_get_params(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
 203                           struct iwl_powertable_cmd *cmd)
 204 {
 205         iwl_power_build_cmd(mvm, vif, cmd);
 206 }
 207 #endif /* CONFIG_IWLWIFI_DEBUGFS */