ath9k_hw: Improve power control accuracy for AR9003

It is done for 5Ghz by adding three temperature slopes.

Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
index da26d37..5ffeda2 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
+++ b/drivers/net/wireless/ath/ath9k/ar9003_eeprom.c
@@ -4062,6 +4062,7 @@ static int ar9003_hw_power_control_override(struct ath_hw *ah,
 {
        int tempSlope = 0;
        struct ar9300_eeprom *eep = &ah->eeprom.ar9300_eep;
+       int f[3], t[3];
 
        REG_RMW(ah, AR_PHY_TPC_11_B0,
                (correction[0] << AR_PHY_TPC_OLPC_GAIN_DELTA_S),
@@ -4090,7 +4091,16 @@ static int ar9003_hw_power_control_override(struct ath_hw *ah,
         */
        if (frequency < 4000)
                tempSlope = eep->modalHeader2G.tempSlope;
-       else
+       else if (eep->base_ext2.tempSlopeLow != 0) {
+               t[0] = eep->base_ext2.tempSlopeLow;
+               f[0] = 5180;
+               t[1] = eep->modalHeader5G.tempSlope;
+               f[1] = 5500;
+               t[2] = eep->base_ext2.tempSlopeHigh;
+               f[2] = 5785;
+               tempSlope = ar9003_hw_power_interpolate((s32) frequency,
+                                                       f, t, 3);
+       } else
                tempSlope = eep->modalHeader5G.tempSlope;
 
        REG_RMW_FIELD(ah, AR_PHY_TPC_19, AR_PHY_TPC_19_ALPHA_THERM, tempSlope);