[PATCH rtw-next] wifi: rtw88: coex: Ignore BT info byte 5 from RTL8821A

[Bitterblue Smith <rtl8821cerfe2@gmail.com>]

Sometimes while watching a Youtube video with Bluetooth headphones the
audio has a lot of interruptions, because the 5th byte of the BT info
sent by RTL8821AU has strange values, which result in
coex_stat->bt_hid_pair_num being 2 or 3. When this happens
rtw_coex_freerun_check() returns true, which causes
rtw_coex_action_wl_connected() to call rtw_coex_action_freerun() instead
of rtw_coex_action_bt_a2dp().

The RTL8821AU vendor driver doesn't do anything with the 5th byte of the
BT info, so ignore it here as well.

Signed-off-by: Bitterblue Smith <rtl8821cerfe2@gmail.com>
---
 drivers/net/wireless/realtek/rtw88/coex.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw88/coex.c b/drivers/net/wireless/realtek/rtw88/coex.c
index ee4007fe6c18..37c336def419 100644
--- a/drivers/net/wireless/realtek/rtw88/coex.c
+++ b/drivers/net/wireless/realtek/rtw88/coex.c
@@ -3109,6 +3109,9 @@ void rtw_coex_bt_info_notify(struct rtw_dev *rtwdev, u8 *buf, u8 length)
 	for (i = 0; i < COEX_BTINFO_LENGTH; i++)
 		coex_stat->bt_info_c2h[rsp_source][i] = buf[i];
 
+	if (rtwdev->chip->id == RTW_CHIP_TYPE_8821A)
+		coex_stat->bt_info_c2h[rsp_source][5] = 0;
+
 	/* get the same info from bt, skip it */
 	if (coex_stat->bt_info_c2h[rsp_source][1] == coex_stat->bt_info_lb2 &&
 	    coex_stat->bt_info_c2h[rsp_source][2] == coex_stat->bt_info_lb3 &&
-- 
2.53.0