[PATCH rtw-next 09/15] wifi: rtw89: coex: bind the RF band in use while WL is doing RFK

[Ping-Ke Shih <pkshih@realtek.com>]

From: Ching-Te Ku <ku920601@realtek.com>

The RF band that TDD and FDD bind to is picked by scoring each BT
link's weight against the WL/BT band-overlap map. That map is built
from connected WL links, so while WL is running RFK on a band it has
not associated on yet, neither band scores and the binding ends up
empty. Coexistence then treats the chip as having no WL/BT band
overlap at all and leaves RFK unprotected against a BT device already
transmitting on that same band, which can corrupt the calibration
result.

Force the score of the band being calibrated up to the binding
threshold when any BT is on an overlapping band, so the RFK band
binds for as long as the calibration runs.

Signed-off-by: Ching-Te Ku <ku920601@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
---
 drivers/net/wireless/realtek/rtw89/coex.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/net/wireless/realtek/rtw89/coex.c b/drivers/net/wireless/realtek/rtw89/coex.c
index 80c278aa96f0..ebc4b1b415c8 100644
--- a/drivers/net/wireless/realtek/rtw89/coex.c
+++ b/drivers/net/wireless/realtek/rtw89/coex.c
@@ -8610,6 +8610,26 @@ static void _set_bind_info(struct rtw89_btc *btc, u8 type)
 			b5g_score += link_weight[j][BTC_BT_B5G];
 	}
 
+	/*
+	 * Consider WL RFK band for coex (avoid missing RFK case)
+	 * If WL is doing RFK, check RFK band vs BT band overlap
+	 * Only add score when RFK band matches BT band
+	 */
+	if (wl->rfk_info.state != BTC_WRFK_STOP) {
+		if (wl->rfk_info.band == RTW89_BAND_2G) {
+			/* RFK on 2.4GHz, check if any BT is also on 2.4GHz */
+			if ((cx->bt0.rf_band_map & BIT(RTW89_BAND_2G)) ||
+			    (cx->bt1.rf_band_map & BIT(RTW89_BAND_2G)))
+				b2g_score = thres;
+		} else if (wl->rfk_info.band == RTW89_BAND_5G ||
+			   wl->rfk_info.band == RTW89_BAND_6G) {
+			/* RFK on 5/6GHz, check if any BT is also on 5GHz */
+			if ((cx->bt0.rf_band_map & BIT(RTW89_BAND_5G)) ||
+			    (cx->bt1.rf_band_map & BIT(RTW89_BAND_5G)))
+				b5g_score = thres;
+		}
+	}
+
 	/* rf-band bound by comparing link weight */
 	if (b2g_score == 0 && b5g_score == 0) /* no-rf-band overlap */
 		bd->rf_band = 0;
-- 
2.25.1