/* HT cap appropriate for wide channels in 2Ghz */
 static struct ieee80211_sta_ht_cap wl18xx_siso40_ht_cap_2ghz = {
        .cap = IEEE80211_HT_CAP_SGI_20 | IEEE80211_HT_CAP_SGI_40 |
-              IEEE80211_HT_CAP_SUP_WIDTH_20_40 | IEEE80211_HT_CAP_DSSSCCK40,
+              IEEE80211_HT_CAP_SUP_WIDTH_20_40 | IEEE80211_HT_CAP_DSSSCCK40 |
+              IEEE80211_HT_CAP_GRN_FLD,
        .ht_supported = true,
        .ampdu_factor = IEEE80211_HT_MAX_AMPDU_16K,
        .ampdu_density = IEEE80211_HT_MPDU_DENSITY_16,
 /* HT cap appropriate for wide channels in 5Ghz */
 static struct ieee80211_sta_ht_cap wl18xx_siso40_ht_cap_5ghz = {
        .cap = IEEE80211_HT_CAP_SGI_20 | IEEE80211_HT_CAP_SGI_40 |
-              IEEE80211_HT_CAP_SUP_WIDTH_20_40,
+              IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
+              IEEE80211_HT_CAP_GRN_FLD,
        .ht_supported = true,
        .ampdu_factor = IEEE80211_HT_MAX_AMPDU_16K,
        .ampdu_density = IEEE80211_HT_MPDU_DENSITY_16,
 
 /* HT cap appropriate for SISO 20 */
 static struct ieee80211_sta_ht_cap wl18xx_siso20_ht_cap = {
-       .cap = IEEE80211_HT_CAP_SGI_20,
+       .cap = IEEE80211_HT_CAP_SGI_20 |
+              IEEE80211_HT_CAP_GRN_FLD,
        .ht_supported = true,
        .ampdu_factor = IEEE80211_HT_MAX_AMPDU_16K,
        .ampdu_density = IEEE80211_HT_MPDU_DENSITY_16,
 
 /* HT cap appropriate for MIMO rates in 20mhz channel */
 static struct ieee80211_sta_ht_cap wl18xx_mimo_ht_cap_2ghz = {
-       .cap = IEEE80211_HT_CAP_SGI_20,
+       .cap = IEEE80211_HT_CAP_SGI_20 |
+              IEEE80211_HT_CAP_GRN_FLD,
        .ht_supported = true,
        .ampdu_factor = IEEE80211_HT_MAX_AMPDU_16K,
        .ampdu_density = IEEE80211_HT_MPDU_DENSITY_16,