ath9k_hw: enable Antenna diversity for AR9485

read antenna diversity and combining information from the EEPROM.
Enable antenna diversity/combining feature only when both LNA
diversity and fast diversity are supported

Cc: Gabriel Tseng <Gabriel.Tseng@Atheros.com>
Cc: Senthilkumar Balasubramanian <Senthilkumar.Balasubramanian@Atheros.com>
Tested-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com>
Signed-off-by: Mohammed Shafi Shajakhan <mshajakhan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 58f3d4210338..b75b5dca4e29 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -2022,6 +2022,22 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
         }
 
 
+        if (AR_SREV_9485(ah)) {
+                ant_div_ctl1 = ah->eep_ops->get_eeprom(ah, EEP_ANT_DIV_CTL1);
+                /*
+                 * enable the diversity-combining algorithm only when
+                 * both enable_lna_div and enable_fast_div are set
+                 *              Table for Diversity
+                 * ant_div_alt_lnaconf          bit 0-1
+                 * ant_div_main_lnaconf         bit 2-3
+                 * ant_div_alt_gaintb           bit 4
+                 * ant_div_main_gaintb          bit 5
+                 * enable_ant_div_lnadiv        bit 6
+                 * enable_ant_fast_div          bit 7
+                 */
+                if ((ant_div_ctl1 >> 0x6) == 0x3)
+                        pCap->hw_caps |= ATH9K_HW_CAP_ANT_DIV_COMB;
+        }
 
         if (AR_SREV_9485_10(ah)) {
                 pCap->pcie_lcr_extsync_en = true;