ath9k: change the default antenna settings based on diversity

change the AR_DEF_ANTENNA register settings i.e setting default antenna
setting only for antenna diversity enabled chipsets. no point in
doing this for MIMO chipsets
Signed-off-by: NMohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/recv.c

@@ -1923,9 +1923,12 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 			skb = hdr_skb;
 		}
 
+
+		if (ah->caps.hw_caps & ATH9K_HW_CAP_ANT_DIV_COMB) {
+
 			/*
-		 * change the default rx antenna if rx diversity chooses the
-		 * other antenna 3 times in a row.
+			 * change the default rx antenna if rx diversity
+			 * chooses the other antenna 3 times in a row.
 			 */
 			if (sc->rx.defant != rs.rs_antenna) {
 				if (++sc->rx.rxotherant >= 3)
@@ -1934,6 +1937,8 @@ int ath_rx_tasklet(struct ath_softc *sc, int flush, bool hp)
 				sc->rx.rxotherant = 0;
 			}
 
+		}
+
 		if (rxs->flag & RX_FLAG_MMIC_STRIPPED)
 			skb_trim(skb, skb->len - 8);