wifi: rtw89: coex: Limit Wi-Fi scan slot cost to avoid A2DP glitch

When Wi-Fi is scanning at 2.4GHz, PTA will abort almost all the BT request.
Once the Wi-Fi slot stay too long, BT audio device can not get enough data,
audio glitch will happened. This patch limit 2.4Ghz Wi-Fi slot to 80ms
while Wi-Fi is scanning to avoid audio glitch.

Signed-off-by: Ching-Te Ku <[email protected]>
Signed-off-by: Ping-Ke Shih <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: Ching-Te Ku

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

@@ -93,7 +93,7 @@ static const struct rtw89_btc_fbtc_slot s_def[] = {
 	[CXST_E2G]	= __DEF_FBTC_SLOT(5,   0xea5a5a5a, SLOT_MIX),
 	[CXST_E5G]	= __DEF_FBTC_SLOT(5,   0xffffffff, SLOT_ISO),
 	[CXST_EBT]	= __DEF_FBTC_SLOT(5,   0xe5555555, SLOT_MIX),
-	[CXST_ENULL]	= __DEF_FBTC_SLOT(5,   0xaaaaaaaa, SLOT_ISO),
+	[CXST_ENULL]	= __DEF_FBTC_SLOT(5,   0x55555555, SLOT_MIX),
 	[CXST_WLK]	= __DEF_FBTC_SLOT(250, 0xea5a5a5a, SLOT_MIX),
 	[CXST_W1FDD]	= __DEF_FBTC_SLOT(50,  0xffffffff, SLOT_ISO),
 	[CXST_B1FDD]	= __DEF_FBTC_SLOT(50,  0xffffdfff, SLOT_ISO),
@@ -4153,6 +4153,7 @@ void rtw89_btc_set_policy_v1(struct rtw89_dev *rtwdev, u16 policy_type)
 				     s_def[CXST_EBT].cxtbl, s_def[CXST_EBT].cxtype);
 			_slot_set_le(btc, CXST_ENULL, s_def[CXST_ENULL].dur,
 				     s_def[CXST_ENULL].cxtbl, s_def[CXST_ENULL].cxtype);
+			_slot_set_dur(btc, CXST_EBT, dur_2);
 			break;
 		case BTC_CXP_OFFE_DEF2:
 			_slot_set(btc, CXST_E2G, 20, cxtbl[1], SLOT_ISO);
@@ -4162,6 +4163,7 @@ void rtw89_btc_set_policy_v1(struct rtw89_dev *rtwdev, u16 policy_type)
 				     s_def[CXST_EBT].cxtbl, s_def[CXST_EBT].cxtype);
 			_slot_set_le(btc, CXST_ENULL, s_def[CXST_ENULL].dur,
 				     s_def[CXST_ENULL].cxtbl, s_def[CXST_ENULL].cxtype);
+			_slot_set_dur(btc, CXST_EBT, dur_2);
 			break;
 		case BTC_CXP_OFFE_2GBWMIXB:
 			if (a2dp->exist)
@@ -4170,6 +4172,7 @@ void rtw89_btc_set_policy_v1(struct rtw89_dev *rtwdev, u16 policy_type)
 				_slot_set(btc, CXST_E2G, 5, tbl_w1, SLOT_MIX);
 			_slot_set_le(btc, CXST_EBT, cpu_to_le16(40),
 				     s_def[CXST_EBT].cxtbl, s_def[CXST_EBT].cxtype);
+			_slot_set_dur(btc, CXST_EBT, dur_2);
 			break;
 		case BTC_CXP_OFFE_WL: /* for 4-way */
 			_slot_set(btc, CXST_E2G, 5, cxtbl[1], SLOT_MIX);