iwlwifi: Thermal Throttling Management - Part 1

Part 1 of Thermal Throttling Management -

Thermal Throttling feature is used to put NIC into low power state when
driver detect the Radio temperature reach pre-defined threshold

Two Thermal Throttling Management Methods; this patch introduce the
Legacy Thermal Management:
   IWL_TI_0: normal temperature, system power state
   IWL_TI_1: high temperature detect, low power state
   IWL_TI_2: higher temperature detected, lower power state
   IWL_TI_CT_KILL: critical temperature detected, lowest power state

Once get into CT_KILL state, uCode go into sleep, driver will stop all
the active queues, then move to IWL_TI_CT_KILL state; also set up 5
seconds timer to toggle CSR flag, uCode wake up upon CSR flag change,
then measure the temperature.
If temperature is above CT_KILL exit threshold, uCode go backto sleep;
if temperature is below CT_KILL exit threshold, uCode send Card State
Notification response with appropriate CT_KILL status flag, and uCode
remain awake, Driver receive Card State Notification Response and update
the card temperature to the CT_KILL exit threshold.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-power.h b/drivers/net/wireless/iwlwifi/iwl-power.h
index 37ba3bb7a25a..7bb10d41ae5f 100644
--- a/drivers/net/wireless/iwlwifi/iwl-power.h
+++ b/drivers/net/wireless/iwlwifi/iwl-power.h
@@ -33,6 +33,38 @@
 
 struct iwl_priv;
 
+#define IWL_TT_INCREASE_MARGIN  5
+
+/* Thermal Throttling State Machine states */
+enum  iwl_tt_state {
+        IWL_TI_0,       /* normal temperature, system power state */
+        IWL_TI_1,       /* high temperature detect, low power state */
+        IWL_TI_2,       /* higher temperature detected, lower power state */
+        IWL_TI_CT_KILL, /* critical temperature detected, lowest power state */
+        IWL_TI_STATE_MAX
+};
+
+/**
+ * struct iwl_tt_mgnt - Thermal Throttling Management structure
+ * @state:          current Thermal Throttling state
+ * @tt_power_mode:  Thermal Throttling power mode index
+ *                  being used to set power level when
+ *                  when thermal throttling state != IWL_TI_0
+ *                  the tt_power_mode should set to different
+ *                  power mode based on the current tt state
+ * @sys_power_mode: previous system power mode
+ *                  before transition into TT state
+ * @tt_previous_temperature: last measured temperature
+ */
+struct iwl_tt_mgmt {
+        enum iwl_tt_state state;
+        u8 tt_power_mode;
+        u8 sys_power_mode;
+#ifdef CONFIG_IWLWIFI_DEBUG
+        s32 tt_previous_temp;
+#endif
+};
+
 enum {
         IWL_POWER_MODE_CAM, /* Continuously Aware Mode, always on */
         IWL_POWER_INDEX_1,
@@ -59,10 +91,20 @@ struct iwl_power_mgr {
         u8 power_mode;
         u8 user_power_setting; /* set by user through sysfs */
         u8 power_disabled; /* set by mac80211's CONF_PS */
+        struct iwl_tt_mgmt tt; /* Thermal Throttling Management */
+        bool ct_kill_toggle;   /* use to toggle the CSR bit when
+                                * checking uCode temperature
+                                */
+        struct timer_list ct_kill_exit_tm;
 };
 
 int iwl_power_update_mode(struct iwl_priv *priv, bool force);
 int iwl_power_set_user_mode(struct iwl_priv *priv, u16 mode);
+void iwl_tt_enter_ct_kill(struct iwl_priv *priv);
+void iwl_tt_exit_ct_kill(struct iwl_priv *priv);
+void iwl_tt_handler(struct iwl_priv *priv);
+void iwl_tt_initialize(struct iwl_priv *priv);
+void iwl_tt_exit(struct iwl_priv *priv);
 void iwl_power_initialize(struct iwl_priv *priv);
 
 #endif  /* __iwl_power_setting_h__ */