ath9k_htc: Enable SGI in HT20 for AR9271

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

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

@@ -404,6 +404,9 @@ static void setup_ht_cap(struct ath9k_htc_priv *priv,
 		       IEEE80211_HT_CAP_SGI_40 |
 		       IEEE80211_HT_CAP_DSSSCCK40;
 
+	if (priv->ah->caps.hw_caps & ATH9K_HW_CAP_SGI_20)
+		ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
+
 	ht_info->ampdu_factor = IEEE80211_HT_MAX_AMPDU_64K;
 	ht_info->ampdu_density = IEEE80211_HT_MPDU_DENSITY_8;
 

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

@@ -367,9 +367,12 @@ static void ath9k_htc_setup_rate(struct ath9k_htc_priv *priv,
 		caps = WLAN_RC_HT_FLAG;
 		if (sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
 			caps |= WLAN_RC_40_FLAG;
-		if (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40)
+		if (conf_is_ht40(&priv->hw->conf) &&
+		    (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40))
+			caps |= WLAN_RC_SGI_FLAG;
+		else if (conf_is_ht20(&priv->hw->conf) &&
+			 (sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20))
 			caps |= WLAN_RC_SGI_FLAG;
-
 	}
 
 	trate->sta_index = ista->index;

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

@@ -2234,7 +2234,7 @@ int ath9k_hw_fill_cap_info(struct ath_hw *ah)
 	if (AR_SREV_9300_20_OR_LATER(ah))
 		pCap->hw_caps |= ATH9K_HW_CAP_RAC_SUPPORTED;
 
-	if (AR_SREV_9287_10_OR_LATER(ah))
+	if (AR_SREV_9287_10_OR_LATER(ah) || AR_SREV_9271(ah))
 		pCap->hw_caps |= ATH9K_HW_CAP_SGI_20;
 
 	return 0;