wifi: rtw89: coex: summarize Wi-Fi to BT scoreboard and inform BT one time a cycle

If Wi-Fi driver send Wi-Fi status to BT via scoreboard too frequent in a
short moment, BT will loss some of them because of hardware response time.
To avoid this issue, change the code flow. Summarize the scoreboard changes
and if the value have changed, send the scoreboard to BT only once in
a coexistence processing cycle. It also can help to reduce driver I/O.
Signed-off-by: Ching-Te Ku <ku920601@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/20220920010939.12173-8-pkshih@realtek.com

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

@@ -3558,11 +3558,22 @@ static void _set_bt_rx_agc(struct rtw89_dev *rtwdev)
 /* TODO add these functions */
 static void _action_common(struct rtw89_dev *rtwdev)
 {
+	struct rtw89_btc *btc = &rtwdev->btc;
+	struct rtw89_btc_wl_info *wl = &btc->cx.wl;
+
 	_set_btg_ctrl(rtwdev);
 	_set_wl_tx_limit(rtwdev);
 	_set_bt_afh_info(rtwdev);
 	_set_bt_rx_agc(rtwdev);
 	_set_rf_trx_para(rtwdev);
+
+	if (wl->scbd_change) {
+		rtw89_mac_cfg_sb(rtwdev, wl->scbd);
+		rtw89_debug(rtwdev, RTW89_DBG_BTC, "[BTC], write scbd: 0x%08x\n",
+			    wl->scbd);
+		wl->scbd_change = false;
+		btc->cx.cnt_wl[BTC_WCNT_SCBDUPDATE]++;
+	}
 }
 
 static void _action_by_bt(struct rtw89_dev *rtwdev)
@@ -3885,20 +3896,20 @@ static void _write_scbd(struct rtw89_dev *rtwdev, u32 val, bool state)
 	struct rtw89_btc *btc = &rtwdev->btc;
 	struct rtw89_btc_wl_info *wl = &btc->cx.wl;
 	u32 scbd_val = 0;
+	u8 force_exec = false;
 
 	if (!chip->scbd)
 		return;
 
 	scbd_val = state ? wl->scbd | val : wl->scbd & ~val;
 
-	if (scbd_val == wl->scbd)
-		return;
-	rtw89_mac_cfg_sb(rtwdev, scbd_val);
-	rtw89_debug(rtwdev, RTW89_DBG_BTC, "[BTC], write scbd: 0x%08x\n",
-		    scbd_val);
-	wl->scbd = scbd_val;
+	if (val & BTC_WSCB_ACTIVE || val & BTC_WSCB_ON)
+		force_exec = true;
 
-	btc->cx.cnt_wl[BTC_WCNT_SCBDUPDATE]++;
+	if (scbd_val != wl->scbd || force_exec) {
+		wl->scbd = scbd_val;
+		wl->scbd_change = true;
+	}
 }
 
 static u8

drivers/net/wireless/realtek/rtw89/core.h

@@ -1308,6 +1308,7 @@ struct rtw89_btc_wl_info {
 	u8 port_id[RTW89_WIFI_ROLE_MLME_MAX];
 	u8 rssi_level;
 
+	bool scbd_change;
 	u32 scbd;
 };