rtw88: coex: simplify the setting and condition about WLAN TX limitation

Life time related setting is related to WLAN active port number,
not its mode. The original setting may cause poor WLAN performance.

In most case, WLAN TX limitation is helpful for BT in coexistence
scenario, especially for A2DP quality.
So this is necessary to fix the setting and constraint it.
Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201109085909.9143-12-pkshih@realtek.com

drivers/net/wireless/realtek/rtw88/coex.c

@@ -38,7 +38,7 @@ static void rtw_coex_limited_tx(struct rtw_dev *rtwdev,
 	struct rtw_chip_info *chip = rtwdev->chip;
 	struct rtw_coex *coex = &rtwdev->coex;
 	struct rtw_coex_stat *coex_stat = &coex->stat;
-	bool wifi_under_b_mode = false;
+	u8 num_of_active_port = 1;
 
 	if (!chip->scbd_support)
 		return;
@@ -70,17 +70,13 @@ static void rtw_coex_limited_tx(struct rtw_dev *rtwdev,
 		/* set queue life time to avoid can't reach tx retry limit
 		 * if tx is always broken by GNT_BT
 		 */
-		rtw_write8_set(rtwdev, REG_LIFETIME_EN, 0xf);
+		if (num_of_active_port <= 1)
+			rtw_write8_set(rtwdev, REG_LIFETIME_EN, 0xf);
 		rtw_write16(rtwdev, REG_RETRY_LIMIT, 0x0808);
 
 		/* auto rate fallback step within 8 retries */
-		if (wifi_under_b_mode) {
-			rtw_write32(rtwdev, REG_DARFRC, 0x1000000);
-			rtw_write32(rtwdev, REG_DARFRCH, 0x1010101);
-		} else {
-			rtw_write32(rtwdev, REG_DARFRC, 0x1000000);
-			rtw_write32(rtwdev, REG_DARFRCH, 0x4030201);
-		}
+		rtw_write32(rtwdev, REG_DARFRC, 0x1000000);
+		rtw_write32(rtwdev, REG_DARFRCH, 0x4030201);
 	} else {
 		rtw_write8_clr(rtwdev, REG_TX_HANG_CTRL, BIT_EN_GNT_BT_AWAKE);
 		rtw_write8_clr(rtwdev, REG_LIFETIME_EN, 0xf);
@@ -101,18 +97,12 @@ static void rtw_coex_limited_wl(struct rtw_dev *rtwdev)
 {
 	struct rtw_coex *coex = &rtwdev->coex;
 	struct rtw_coex_dm *coex_dm = &coex->dm;
-	struct rtw_coex_stat *coex_stat = &coex->stat;
 	bool tx_limit = false;
 	bool tx_agg_ctrl = false;
 
-	if (coex->under_5g ||
-	    coex_dm->bt_status == COEX_BTSTATUS_NCON_IDLE) {
-		/* no need to limit tx */
-	} else {
+	if (!coex->under_5g && coex_dm->bt_status != COEX_BTSTATUS_NCON_IDLE) {
 		tx_limit = true;
-		if (coex_stat->bt_hid_exist || coex_stat->bt_hfp_exist ||
-		    coex_stat->bt_hid_pair_num > 0)
-			tx_agg_ctrl = true;
+		tx_agg_ctrl = true;
 	}
 
 	rtw_coex_limited_tx(rtwdev, tx_limit, tx_agg_ctrl);