wifi: rtw89: coex: add return value to ensure H2C command is success or not

Add return value to H2C function, and only record down the value while
H2C command success, this can help us to check the real time status.
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://msgid.link/20240229074514.219276-7-pkshih@realtek.com

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

@@ -683,20 +683,25 @@ static void _run_coex(struct rtw89_dev *rtwdev,
 static void _write_scbd(struct rtw89_dev *rtwdev, u32 val, bool state);
 static void _update_bt_scbd(struct rtw89_dev *rtwdev, bool only_update);
 
-static void _send_fw_cmd(struct rtw89_dev *rtwdev, u8 h2c_class, u8 h2c_func,
-			 void *param, u16 len)
+static int _send_fw_cmd(struct rtw89_dev *rtwdev, u8 h2c_class, u8 h2c_func,
+			void *param, u16 len)
 {
 	struct rtw89_btc *btc = &rtwdev->btc;
 	struct rtw89_btc_btf_fwinfo *pfwinfo = &btc->fwinfo;
 	struct rtw89_btc_cx *cx = &btc->cx;
 	struct rtw89_btc_wl_info *wl = &cx->wl;
+	struct rtw89_btc_dm *dm = &btc->dm;
 	int ret;
 
-	if (!wl->status.map.init_ok) {
+	if (len > BTC_H2C_MAXLEN || len == 0) {
+		btc->fwinfo.cnt_h2c_fail++;
+		dm->error.map.h2c_buffer_over = true;
+		return -EINVAL;
+	} else if (!wl->status.map.init_ok) {
 		rtw89_debug(rtwdev, RTW89_DBG_BTC,
 			    "[BTC], %s(): return by btc not init!!\n", __func__);
 		pfwinfo->cnt_h2c_fail++;
-		return;
+		return -EINVAL;
 	} else if ((wl->status.map.rf_off_pre == BTC_LPS_RF_OFF &&
 		    wl->status.map.rf_off == BTC_LPS_RF_OFF) ||
 		   (wl->status.map.lps_pre == BTC_LPS_RF_OFF &&
@@ -704,15 +709,17 @@ static void _send_fw_cmd(struct rtw89_dev *rtwdev, u8 h2c_class, u8 h2c_func,
 		rtw89_debug(rtwdev, RTW89_DBG_BTC,
 			    "[BTC], %s(): return by wl off!!\n", __func__);
 		pfwinfo->cnt_h2c_fail++;
-		return;
+		return -EINVAL;
 	}
 
-	pfwinfo->cnt_h2c++;
-
 	ret = rtw89_fw_h2c_raw_with_hdr(rtwdev, h2c_class, h2c_func, param, len,
 					false, true);
-	if (ret != 0)
+	if (ret)
 		pfwinfo->cnt_h2c_fail++;
+	else
+		pfwinfo->cnt_h2c++;
+
+	return ret;
 }
 
 static void _reset_btc_var(struct rtw89_dev *rtwdev, u8 type)
@@ -1938,6 +1945,7 @@ static void rtw89_btc_fw_en_rpt(struct rtw89_dev *rtwdev,
 	struct rtw89_btc_btf_fwinfo *fwinfo = &btc->fwinfo;
 	struct rtw89_btc_btf_set_report r = {0};
 	u32 val, bit_map;
+	int ret;
 
 	if ((wl_smap->rf_off || wl_smap->lps != BTC_LPS_OFF) && rpt_state != 0)
 		return;
@@ -1956,13 +1964,13 @@ static void rtw89_btc_fw_en_rpt(struct rtw89_dev *rtwdev,
 	if (val == fwinfo->rpt_en_map)
 		return;
 
-	fwinfo->rpt_en_map = val;
-
 	r.fver = BTF_SET_REPORT_VER;
 	r.enable = cpu_to_le32(val);
 	r.para = cpu_to_le32(rpt_state);
 
-	_send_fw_cmd(rtwdev, BTFC_SET, SET_REPORT_EN, &r, sizeof(r));
+	ret = _send_fw_cmd(rtwdev, BTFC_SET, SET_REPORT_EN, &r, sizeof(r));
+	if (!ret)
+		fwinfo->rpt_en_map = val;
 }
 
 static void rtw89_btc_fw_set_slots(struct rtw89_dev *rtwdev, u8 num,
@@ -2050,6 +2058,7 @@ static void _fw_set_policy(struct rtw89_dev *rtwdev, u16 policy_type,
 {
 	struct rtw89_btc *btc = &rtwdev->btc;
 	struct rtw89_btc_dm *dm = &btc->dm;
+	int ret;
 
 	dm->run_action = action;
 
@@ -2078,11 +2087,12 @@ static void _fw_set_policy(struct rtw89_dev *rtwdev, u16 policy_type,
 	if (btc->lps == 1)
 		rtw89_set_coex_ctrl_lps(rtwdev, btc->lps);
 
-	_send_fw_cmd(rtwdev, BTFC_SET, SET_CX_POLICY,
-		     btc->policy, btc->policy_len);
-
-	memcpy(&dm->tdma_now, &dm->tdma, sizeof(dm->tdma_now));
-	memcpy(&dm->slot_now, &dm->slot, sizeof(dm->slot_now));
+	ret = _send_fw_cmd(rtwdev, BTFC_SET, SET_CX_POLICY,
+			   btc->policy, btc->policy_len);
+	if (!ret) {
+		memcpy(&dm->tdma_now, &dm->tdma, sizeof(dm->tdma_now));
+		memcpy(&dm->slot_now, &dm->slot, sizeof(dm->slot_now));
+	}
 
 	if (btc->update_policy_force)
 		btc->update_policy_force = false;
@@ -2298,20 +2308,22 @@ static void _set_bt_tx_power(struct rtw89_dev *rtwdev, u8 level)
 {
 	struct rtw89_btc *btc = &rtwdev->btc;
 	struct rtw89_btc_bt_info *bt = &btc->cx.bt;
+	int ret;
 	u8 buf;
 
 	if (bt->rf_para.tx_pwr_freerun == level)
 		return;
 
-	bt->rf_para.tx_pwr_freerun = level;
-	btc->dm.rf_trx_para.bt_tx_power = level;
-
 	rtw89_debug(rtwdev, RTW89_DBG_BTC,
 		    "[BTC], %s(): level = %d\n",
 		    __func__, level);
 
 	buf = (s8)(-level);
-	_send_fw_cmd(rtwdev, BTFC_SET, SET_BT_TX_PWR, &buf, 1);
+	ret = _send_fw_cmd(rtwdev, BTFC_SET, SET_BT_TX_PWR, &buf, 1);
+	if (!ret) {
+		bt->rf_para.tx_pwr_freerun = level;
+		btc->dm.rf_trx_para.bt_tx_power = level;
+	}
 }
 
 #define BTC_BT_RX_NORMAL_LVL 7

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

@@ -7,6 +7,8 @@
 
 #include "core.h"
 
+#define BTC_H2C_MAXLEN 2020
+
 enum btc_mode {
 	BTC_MODE_NORMAL,
 	BTC_MODE_WL,