iwlwifi: 5150 compute ct kill threshold

This patch adds computation of ct kill threshold
for 5150. Threshold is computed from calibration
data in the EEPROM.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 13 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index c1e7a4264086..26e04eccaa85 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -426,6 +426,17 @@ static const u8 *iwl5000_eeprom_query_addr(const struct iwl_priv *priv,
         return &priv->eeprom[address];
 }
 
+static s32 iwl5150_get_ct_threshold(struct iwl_priv *priv)
+{
+        const s32 volt2temp_coef = -5;
+        u16 *temp_calib = (u16 *)iwl_eeprom_query_addr(priv,
+                                                EEPROM_5000_TEMPERATURE);
+        /* offset =  temperate -  voltage / coef */
+        s32 offset = temp_calib[0] - temp_calib[1] / volt2temp_coef;
+        s32 threshold = (s32)CELSIUS_TO_KELVIN(CT_KILL_THRESHOLD) - offset;
+        return threshold * volt2temp_coef;
+}
+
 /*
  *  Calibration
  */
@@ -859,7 +870,7 @@ static int iwl5000_hw_set_hw_params(struct iwl_priv *priv)
         case CSR_HW_REV_TYPE_5150:
                 /* 5150 wants in Kelvin */
                 priv->hw_params.ct_kill_threshold =
-                                CELSIUS_TO_KELVIN(CT_KILL_THRESHOLD);
+                                iwl5150_get_ct_threshold(priv);
                 break;
         }
 
diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom.h b/drivers/net/wireless/iwlwifi/iwl-eeprom.h
index 997f23c8db2e..8f6b05fa2330 100644
--- a/drivers/net/wireless/iwlwifi/iwl-eeprom.h
+++ b/drivers/net/wireless/iwlwifi/iwl-eeprom.h
@@ -147,6 +147,7 @@ struct iwl_eeprom_channel {
 /*5000 calibrations */
 #define EEPROM_5000_CALIB_ALL   (INDIRECT_ADDRESS | INDIRECT_CALIBRATION)
 #define EEPROM_5000_XTAL        ((2*0x128) | EEPROM_5000_CALIB_ALL)
+#define EEPROM_5000_TEMPERATURE ((2*0x12A) | EEPROM_5000_CALIB_ALL)
 
 /* 5000 links */
 #define EEPROM_5000_LINK_HOST             (2*0x64)