ath9k: Store the correct max TX power level

This patch fixes a bug where the max power level
was being calculated incorrectly.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 18 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/eeprom.c b/drivers/net/wireless/ath9k/eeprom.c
index b55e9920a5d4..34e9d818fadd 100644
--- a/drivers/net/wireless/ath9k/eeprom.c
+++ b/drivers/net/wireless/ath9k/eeprom.c
@@ -2615,6 +2615,21 @@ static int ath9k_hw_def_set_txpower(struct ath_hw *ah,
         else
                 ah->regulatory.max_power_level = ratesArray[i];
 
+        switch(ar5416_get_ntxchains(ah->txchainmask)) {
+        case 1:
+                break;
+        case 2:
+                ah->regulatory.max_power_level += INCREASE_MAXPOW_BY_TWO_CHAIN;
+                break;
+        case 3:
+                ah->regulatory.max_power_level += INCREASE_MAXPOW_BY_THREE_CHAIN;
+                break;
+        default:
+                DPRINTF(ah->ah_sc, ATH_DBG_EEPROM,
+                        "Invalid chainmask configuration\n");
+                break;
+        }
+
         return 0;
 }
 
diff --git a/drivers/net/wireless/ath9k/eeprom.h b/drivers/net/wireless/ath9k/eeprom.h
index 99863b570441..b7c656c84ba3 100644
--- a/drivers/net/wireless/ath9k/eeprom.h
+++ b/drivers/net/wireless/ath9k/eeprom.h
@@ -75,6 +75,9 @@
 #define SUB_NUM_CTL_MODES_AT_5G_40 2
 #define SUB_NUM_CTL_MODES_AT_2G_40 3
 
+#define INCREASE_MAXPOW_BY_TWO_CHAIN     6  /* 10*log10(2)*2 */
+#define INCREASE_MAXPOW_BY_THREE_CHAIN   10 /* 10*log10(3)*2 */
+
 #define AR_EEPROM_MAC(i)        (0x1d+(i))
 #define ATH9K_POW_SM(_r, _s)    (((_r) & 0x3f) << (_s))
 #define FREQ2FBIN(x, y)         ((y) ? ((x) - 2300) : (((x) - 4800) / 5))