ath9k: Fix bugs in handling TX power

* Get power table offset from the EEPROM instead of using
  a hardcoded value of -5 if the EEPROM rev is >= 21.
* Add support in the 4k eeprom code for tx power offset
  in case we have a 4k AR9280 implementation.
* Fix tx power accuracy at high powers.

Signed-off-by: Senthil Balasubramanian <senthilkumar@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath9k/eeprom_4k.c b/drivers/net/wireless/ath/ath9k/eeprom_4k.c
index 2a27b1d51a1b..58167d861dc6 100644
--- a/drivers/net/wireless/ath/ath9k/eeprom_4k.c
+++ b/drivers/net/wireless/ath/ath9k/eeprom_4k.c
@@ -210,6 +210,8 @@ static u32 ath9k_hw_4k_get_eeprom(struct ath_hw *ah,
                 return pBase->rxMask;
         case EEP_FRAC_N_5G:
                 return 0;
+        case EEP_PWR_TABLE_OFFSET:
+                return AR5416_PWR_TABLE_OFFSET_DB;
         default:
                 return 0;
         }
@@ -753,7 +755,7 @@ static void ath9k_hw_4k_set_txpower(struct ath_hw *ah,
 
         if (AR_SREV_9280_10_OR_LATER(ah)) {
                 for (i = 0; i < Ar5416RateSize; i++)
-                        ratesArray[i] -= AR5416_PWR_TABLE_OFFSET * 2;
+                        ratesArray[i] -= AR5416_PWR_TABLE_OFFSET_DB * 2;
         }
 
         /* OFDM power per rate */