rtlwifi: Correct power save capability while init mac80211

Since the driver itself will enter power saving mode dynamically
according to the traffic, we set hw capability SUPPORTS_PS and
SUPPORTS_DYNAMIC_PS in case of fwctrl_lps.

The process IEEE80211_CONF_CHANGE_PS in op_config is used by
SW-LPS only, so we add constraints to avoid errors.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: vincent_fann <vincent_fann@realtek.com>
Signed-off-by: shaofu <shaofu@realtek.com>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
diff --git a/drivers/net/wireless/realtek/rtlwifi/base.c b/drivers/net/wireless/realtek/rtlwifi/base.c
index bdc3791..6415ec0 100644
--- a/drivers/net/wireless/realtek/rtlwifi/base.c
+++ b/drivers/net/wireless/realtek/rtlwifi/base.c
@@ -405,6 +405,10 @@ static void _rtl_init_mac80211(struct ieee80211_hw *hw)
 		ieee80211_hw_set(hw, SUPPORTS_PS);
 		ieee80211_hw_set(hw, PS_NULLFUNC_STACK);
 	}
+	if (rtlpriv->psc.fwctrl_lps) {
+		ieee80211_hw_set(hw, SUPPORTS_PS);
+		ieee80211_hw_set(hw, SUPPORTS_DYNAMIC_PS);
+	}
 	hw->wiphy->interface_modes =
 	    BIT(NL80211_IFTYPE_AP) |
 	    BIT(NL80211_IFTYPE_STATION) |