rtw89: packed IGI configuration flow into function for DIG feature

Refinement of DIG flow, a mechanism to adjust Rx gain for better Rx
performance, by packing IGI(initial gain index) configuration flow into
one function.
Signed-off-by: Johnson Lin <johnson.lin@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220318023214.32411-6-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/phy.c

@@ -3180,6 +3180,21 @@ static void rtw89_phy_dig_sdagc_follow_pagc_config(struct rtw89_dev *rtwdev,
 	rtw89_debug(rtwdev, RTW89_DBG_DIG, "sdagc_follow_pagc=%d\n", enable);
 }
 
+static void rtw89_phy_dig_config_igi(struct rtw89_dev *rtwdev)
+{
+	struct rtw89_dig_info *dig = &rtwdev->dig;
+
+	if (dig->force_gaincode_idx_en) {
+		rtw89_phy_dig_set_igi_cr(rtwdev, dig->force_gaincode);
+		rtw89_debug(rtwdev, RTW89_DBG_DIG,
+			    "Force gaincode index enabled.\n");
+	} else {
+		rtw89_phy_dig_gaincode_by_rssi(rtwdev, dig->igi_fa_rssi,
+					       &dig->cur_gaincode);
+		rtw89_phy_dig_set_igi_cr(rtwdev, dig->cur_gaincode);
+	}
+}
+
 static void rtw89_phy_dig_dyn_pd_th(struct rtw89_dev *rtwdev, u8 rssi,
 				    bool enable)
 {
@@ -3294,15 +3309,7 @@ void rtw89_phy_dig(struct rtw89_dev *rtwdev)
 		    dig->igi_rssi, dig->dyn_igi_max, dig->dyn_igi_min,
 		    dig->igi_fa_rssi);
 
-	if (dig->force_gaincode_idx_en) {
-		rtw89_phy_dig_set_igi_cr(rtwdev, dig->force_gaincode);
-		rtw89_debug(rtwdev, RTW89_DBG_DIG,
-			    "Force gaincode index enabled.\n");
-	} else {
-		rtw89_phy_dig_gaincode_by_rssi(rtwdev, dig->igi_fa_rssi,
-					       &dig->cur_gaincode);
-		rtw89_phy_dig_set_igi_cr(rtwdev, dig->cur_gaincode);
-	}
+	rtw89_phy_dig_config_igi(rtwdev);
 
 	rtw89_phy_dig_dyn_pd_th(rtwdev, dig->igi_fa_rssi, dig->dyn_pd_th_en);