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

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   4  * redistributing this file, you may do so under either license.
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   6  * GPL LICENSE SUMMARY
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   8  * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
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  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
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  17  * General Public License for more details.
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  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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  24  * The full GNU General Public License is included in this distribution
  25  * in the file called COPYING.
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  27  * Contact Information:
  28  *  Intel Linux Wireless <ilw@linux.intel.com>
  29  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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  60  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  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_mvm_power_log(struct iwl_mvm *mvm,
  79                               struct iwl_powertable_cmd *cmd)
  80 {
  81         IWL_DEBUG_POWER(mvm,
  82                         "Sending power table command for power level %d, flags = 0x%X\n",
  83                         iwlmvm_mod_params.power_scheme,
  84                         le16_to_cpu(cmd->flags));
  85         IWL_DEBUG_POWER(mvm, "Keep alive = %u sec\n", cmd->keep_alive_seconds);
  86
  87         if (cmd->flags & cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK)) {
  88                 IWL_DEBUG_POWER(mvm, "Rx timeout = %u usec\n",
  89                                 le32_to_cpu(cmd->rx_data_timeout));
  90                 IWL_DEBUG_POWER(mvm, "Tx timeout = %u usec\n",
  91                                 le32_to_cpu(cmd->tx_data_timeout));
  92                 IWL_DEBUG_POWER(mvm, "LP RX RSSI threshold = %u\n",
  93                                 cmd->lprx_rssi_threshold);
  94         }
  95 }
  96
  97 void iwl_mvm_power_build_cmd(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
  98                              struct iwl_powertable_cmd *cmd)
  99 {
 100         struct ieee80211_hw *hw = mvm->hw;
 101         struct ieee80211_chanctx_conf *chanctx_conf;
 102         struct ieee80211_channel *chan;
 103         int dtimper, dtimper_msec;
 104         int keep_alive;
 105         bool radar_detect = false;
 106
 107         /*
 108          * Regardless of power management state the driver must set
 109          * keep alive period. FW will use it for sending keep alive NDPs
 110          * immediately after association.
 111          */
 112         cmd->keep_alive_seconds = POWER_KEEP_ALIVE_PERIOD_SEC;
 113
 114         if (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM)
 115                 return;
 116
 117         cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_SAVE_ENA_MSK);
 118
 119         if (!vif->bss_conf.ps)
 120                 return;
 121
 122         cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK);
 123
 124         dtimper = hw->conf.ps_dtim_period ?: 1;
 125
 126         /* Check if radar detection is required on current channel */
 127         rcu_read_lock();
 128         chanctx_conf = rcu_dereference(vif->chanctx_conf);
 129         WARN_ON(!chanctx_conf);
 130         if (chanctx_conf) {
 131                 chan = chanctx_conf->def.chan;
 132                 radar_detect = chan->flags & IEEE80211_CHAN_RADAR;
 133         }
 134         rcu_read_unlock();
 135
 136         /* Check skip over DTIM conditions */
 137         if (!radar_detect && (dtimper <= 10) &&
 138             (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_LP))
 139                 cmd->flags |= cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
 140
 141         /* Check that keep alive period is at least 3 * DTIM */
 142         dtimper_msec = dtimper * vif->bss_conf.beacon_int;
 143         keep_alive = max_t(int, 3 * dtimper_msec,
 144                            MSEC_PER_SEC * cmd->keep_alive_seconds);
 145         keep_alive = DIV_ROUND_UP(keep_alive, MSEC_PER_SEC);
 146         cmd->keep_alive_seconds = keep_alive;
 147
 148         cmd->rx_data_timeout = cpu_to_le32(100 * USEC_PER_MSEC);
 149         cmd->tx_data_timeout = cpu_to_le32(100 * USEC_PER_MSEC);
 150 }
 151
 152 int iwl_mvm_power_update_mode(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 153 {
 154         struct iwl_powertable_cmd cmd = {};
 155
 156         if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
 157                 return 0;
 158
 159         iwl_mvm_power_build_cmd(mvm, vif, &cmd);
 160         iwl_mvm_power_log(mvm, &cmd);
 161
 162         return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_SYNC,
 163                                     sizeof(cmd), &cmd);
 164 }
 165
 166 int iwl_mvm_power_disable(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
 167 {
 168         struct iwl_powertable_cmd cmd = {};
 169
 170         if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
 171                 return 0;
 172
 173         if (iwlmvm_mod_params.power_scheme != IWL_POWER_SCHEME_CAM)
 174                 cmd.flags |= cpu_to_le16(POWER_FLAGS_POWER_SAVE_ENA_MSK);
 175
 176         iwl_mvm_power_log(mvm, &cmd);
 177
 178         return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_ASYNC,
 179                                     sizeof(cmd), &cmd);
 180 }