rtw88: add BT co-existence support

Both RTL8822BE/RTL8822CE are WiFi + BT combo chips. Since
WiFi and BT use 2.4GHz to transmit, it is important to
make sure they run concurrently without interfering each
other. To achieve this, WiFi driver requires a mechanism
to collaborate with BT, whether they share the antenna(s)
or not.

The final decision made by the co-existence mechanism is
to choose a proper strategy, or called "tdma/table", and
inform either firmware or hardware of the strategy.
To choose a strategy, co-existence mechanism needs to
have enough information from WiFi and BT.

BT information is provided through firmware C2H.
The contents describe the current status of BT, such as
if BT is connected or is idle, or the profile that is
being used.

WiFi information can be provided by WiFi itself. The WiFi
driver will call various of "notify" functions each time
the state of WiFi changed, such as WiFi is going to switch
channel or is connected. Also WiFi driver can know if it
shares antenna with BT by reading efuse content. Antenna
configuration of the module will finally get a different
strategy.

Upon receiving any information from WiFi or BT, the WiFi
driver will run the co-existence mechanism immediately.
It will set the RF antenna configuration according to the
strategy through the TDMA H2C to firmware and a hardware
table. Based on the tdma/table, WiFi + BT should work with
each other, and having a better user experience.

Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

1 files changed, 41 insertions, 4 deletions

diff --git a/drivers/net/wireless/realtek/rtw88/main.c b/drivers/net/wireless/realtek/rtw88/main.c
index 5a2c06267d07..e5a6bc094808 100644
--- a/drivers/net/wireless/realtek/rtw88/main.c
+++ b/drivers/net/wireless/realtek/rtw88/main.c
@@ -8,6 +8,7 @@
 #include "ps.h"
 #include "sec.h"
 #include "mac.h"
+#include "coex.h"
 #include "phy.h"
 #include "reg.h"
 #include "efuse.h"
@@ -149,6 +150,7 @@ static void rtw_watch_dog_work(struct work_struct *work)
 	struct rtw_dev *rtwdev = container_of(work, struct rtw_dev,
 					      watch_dog_work.work);
 	struct rtw_watch_dog_iter_data data = {};
+	bool busy_traffic = rtw_flag_check(rtwdev, RTW_FLAG_BUSY_TRAFFIC);
 
 	if (!rtw_flag_check(rtwdev, RTW_FLAG_RUNNING))
 		return;
@@ -156,6 +158,14 @@ static void rtw_watch_dog_work(struct work_struct *work)
 	ieee80211_queue_delayed_work(rtwdev->hw, &rtwdev->watch_dog_work,
 				     RTW_WATCH_DOG_DELAY_TIME);
 
+	if (rtwdev->stats.tx_cnt > 100 || rtwdev->stats.rx_cnt > 100)
+		rtw_flag_set(rtwdev, RTW_FLAG_BUSY_TRAFFIC);
+	else
+		rtw_flag_clear(rtwdev, RTW_FLAG_BUSY_TRAFFIC);
+
+	if (busy_traffic != rtw_flag_check(rtwdev, RTW_FLAG_BUSY_TRAFFIC))
+		rtw_coex_wl_status_change_notify(rtwdev);
+
 	/* reset tx/rx statictics */
 	rtwdev->stats.tx_unicast = 0;
 	rtwdev->stats.rx_unicast = 0;
@@ -298,6 +308,15 @@ void rtw_set_channel(struct rtw_dev *rtwdev)
 
 	chip->ops->set_channel(rtwdev, center_chan, bandwidth, primary_chan_idx);
 
+	if (hal->current_band_type == RTW_BAND_5G) {
+		rtw_coex_switchband_notify(rtwdev, COEX_SWITCH_TO_5G);
+	} else {
+		if (rtw_flag_check(rtwdev, RTW_FLAG_SCANNING))
+			rtw_coex_switchband_notify(rtwdev, COEX_SWITCH_TO_24G);
+		else
+			rtw_coex_switchband_notify(rtwdev, COEX_SWITCH_TO_24G_NOFORSCAN);
+	}
+
 	rtw_phy_set_tx_power_level(rtwdev, center_chan);
 }
 
@@ -641,6 +660,7 @@ static int rtw_power_on(struct rtw_dev *rtwdev)
 {
 	struct rtw_chip_info *chip = rtwdev->chip;
 	struct rtw_fw_state *fw = &rtwdev->fw;
+	bool wifi_only;
 	int ret;
 
 	ret = rtw_hci_setup(rtwdev);
@@ -684,6 +704,10 @@ static int rtw_power_on(struct rtw_dev *rtwdev)
 		goto err_off;
 	}
 
+	wifi_only = !rtwdev->efuse.btcoex;
+	rtw_coex_power_on_setting(rtwdev);
+	rtw_coex_init_hw_config(rtwdev, wifi_only);
+
 	return 0;
 
 err_off:
@@ -722,10 +746,15 @@ static void rtw_power_off(struct rtw_dev *rtwdev)
 
 void rtw_core_stop(struct rtw_dev *rtwdev)
 {
+	struct rtw_coex *coex = &rtwdev->coex;
+
 	rtw_flag_clear(rtwdev, RTW_FLAG_RUNNING);
 	rtw_flag_clear(rtwdev, RTW_FLAG_FW_RUNNING);
 
 	cancel_delayed_work_sync(&rtwdev->watch_dog_work);
+	cancel_delayed_work_sync(&coex->bt_relink_work);
+	cancel_delayed_work_sync(&coex->bt_reenable_work);
+	cancel_delayed_work_sync(&coex->defreeze_work);
 
 	rtw_power_off(rtwdev);
 }
@@ -876,7 +905,6 @@ static int rtw_chip_parameter_setup(struct rtw_dev *rtwdev)
 	struct rtw_chip_info *chip = rtwdev->chip;
 	struct rtw_hal *hal = &rtwdev->hal;
 	struct rtw_efuse *efuse = &rtwdev->efuse;
-	u32 wl_bt_pwr_ctrl;
 	int ret = 0;
 
 	switch (rtw_hci_type(rtwdev)) {
@@ -888,9 +916,6 @@ static int rtw_chip_parameter_setup(struct rtw_dev *rtwdev)
 		return -EINVAL;
 	}
 
-	wl_bt_pwr_ctrl = rtw_read32(rtwdev, REG_WL_BT_PWR_CTRL);
-	if (wl_bt_pwr_ctrl & BIT_BT_FUNC_EN)
-		rtwdev->efuse.btcoex = true;
 	hal->chip_version = rtw_read32(rtwdev, REG_SYS_CFG1);
 	hal->fab_version = BIT_GET_VENDOR_ID(hal->chip_version) >> 2;
 	hal->cut_version = BIT_GET_CHIP_VER(hal->chip_version);
@@ -1044,11 +1069,14 @@ static int rtw_chip_efuse_info_setup(struct rtw_dev *rtwdev)
 		efuse->lna_type_5g = 0;
 	if (efuse->channel_plan == 0xff)
 		efuse->channel_plan = 0x7f;
+	if (efuse->rf_board_option == 0xff)
+		efuse->rf_board_option = 0;
 	if (efuse->bt_setting & BIT(0))
 		efuse->share_ant = true;
 	if (efuse->regd == 0xff)
 		efuse->regd = 0;
 
+	efuse->btcoex = (efuse->rf_board_option & 0xe0) == 0x20;
 	efuse->ext_pa_2g = efuse->pa_type_2g & BIT(4) ? 1 : 0;
 	efuse->ext_lna_2g = efuse->lna_type_2g & BIT(3) ? 1 : 0;
 	efuse->ext_pa_5g = efuse->pa_type_5g & BIT(0) ? 1 : 0;
@@ -1111,6 +1139,7 @@ EXPORT_SYMBOL(rtw_chip_info_setup);
 
 int rtw_core_init(struct rtw_dev *rtwdev)
 {
+	struct rtw_coex *coex = &rtwdev->coex;
 	int ret;
 
 	INIT_LIST_HEAD(&rtwdev->rsvd_page_list);
@@ -1120,8 +1149,12 @@ int rtw_core_init(struct rtw_dev *rtwdev)
 
 	INIT_DELAYED_WORK(&rtwdev->watch_dog_work, rtw_watch_dog_work);
 	INIT_DELAYED_WORK(&rtwdev->lps_work, rtw_lps_work);
+	INIT_DELAYED_WORK(&coex->bt_relink_work, rtw_coex_bt_relink_work);
+	INIT_DELAYED_WORK(&coex->bt_reenable_work, rtw_coex_bt_reenable_work);
+	INIT_DELAYED_WORK(&coex->defreeze_work, rtw_coex_defreeze_work);
 	INIT_WORK(&rtwdev->c2h_work, rtw_c2h_work);
 	skb_queue_head_init(&rtwdev->c2h_queue);
+	skb_queue_head_init(&rtwdev->coex.queue);
 	skb_queue_head_init(&rtwdev->tx_report.queue);
 
 	spin_lock_init(&rtwdev->dm_lock);
@@ -1130,8 +1163,11 @@ int rtw_core_init(struct rtw_dev *rtwdev)
 	spin_lock_init(&rtwdev->tx_report.q_lock);
 
 	mutex_init(&rtwdev->mutex);
+	mutex_init(&rtwdev->coex.mutex);
 	mutex_init(&rtwdev->hal.tx_power_mutex);
 
+	init_waitqueue_head(&rtwdev->coex.wait);
+
 	rtwdev->sec.total_cam_num = 32;
 	rtwdev->hal.current_channel = 1;
 	set_bit(RTW_BC_MC_MACID, rtwdev->mac_id_map);
@@ -1174,6 +1210,7 @@ void rtw_core_deinit(struct rtw_dev *rtwdev)
 	}
 
 	mutex_destroy(&rtwdev->mutex);
+	mutex_destroy(&rtwdev->coex.mutex);
 	mutex_destroy(&rtwdev->hal.tx_power_mutex);
 }
 EXPORT_SYMBOL(rtw_core_deinit);