rtw88: 8723d: Add shutdown callback to disable BT USB suspend

Without this patch, wifi card can't initialize properly due to BT in USB
suspend state. So, we disable BT USB suspend (wakeup) in shutdown callback
that is the moment before rebooting. To save BT USB power, we can't do this
in 'remove' callback.
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Yan-Hsuan Chuang <yhchuang@realtek.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200512102621.5148-5-yhchuang@realtek.com

drivers/net/wireless/realtek/rtw88/main.h

@@ -795,6 +795,7 @@ struct rtw_regulatory {
 
 struct rtw_chip_ops {
 	int (*mac_init)(struct rtw_dev *rtwdev);
+	void (*shutdown)(struct rtw_dev *rtwdev);
 	int (*read_efuse)(struct rtw_dev *rtwdev, u8 *map);
 	void (*phy_set_param)(struct rtw_dev *rtwdev);
 	void (*set_channel)(struct rtw_dev *rtwdev, u8 channel,

drivers/net/wireless/realtek/rtw88/pci.c

@@ -1573,6 +1573,22 @@ static void rtw_pci_remove(struct pci_dev *pdev)
 	ieee80211_free_hw(hw);
 }
 
+static void rtw_pci_shutdown(struct pci_dev *pdev)
+{
+	struct ieee80211_hw *hw = pci_get_drvdata(pdev);
+	struct rtw_dev *rtwdev;
+	struct rtw_chip_info *chip;
+
+	if (!hw)
+		return;
+
+	rtwdev = hw->priv;
+	chip = rtwdev->chip;
+
+	if (chip->ops->shutdown)
+		chip->ops->shutdown(rtwdev);
+}
+
 static const struct pci_device_id rtw_pci_id_table[] = {
 #ifdef CONFIG_RTW88_8822BE
 	{ RTK_PCI_DEVICE(PCI_VENDOR_ID_REALTEK, 0xB822, rtw8822b_hw_spec) },
@@ -1593,6 +1609,7 @@ static struct pci_driver rtw_pci_driver = {
 	.probe = rtw_pci_probe,
 	.remove = rtw_pci_remove,
 	.driver.pm = &rtw_pm_ops,
+	.shutdown = rtw_pci_shutdown,
 };
 module_pci_driver(rtw_pci_driver);
 

drivers/net/wireless/realtek/rtw88/reg.h

@@ -83,6 +83,7 @@
 #define BIT_DBG_GNT_WL_BT	BIT(27)
 #define BIT_LTE_MUX_CTRL_PATH	BIT(26)
 #define REG_HCI_OPT_CTRL	0x0074
+#define BIT_USB_SUS_DIS		BIT(8)
 
 #define REG_AFE_CTRL_4		0x0078
 #define BIT_CK320M_AFE_EN	BIT(4)

drivers/net/wireless/realtek/rtw88/rtw8723d.c

@@ -549,6 +549,11 @@ static int rtw8723d_mac_init(struct rtw_dev *rtwdev)
 	return 0;
 }
 
+static void rtw8723d_shutdown(struct rtw_dev *rtwdev)
+{
+	rtw_write16_set(rtwdev, REG_HCI_OPT_CTRL, BIT_USB_SUS_DIS);
+}
+
 static void rtw8723d_cfg_ldo25(struct rtw_dev *rtwdev, bool enable)
 {
 	u8 ldo_pwr;
@@ -1790,6 +1795,7 @@ static struct rtw_chip_ops rtw8723d_ops = {
 	.query_rx_desc		= rtw8723d_query_rx_desc,
 	.set_channel		= rtw8723d_set_channel,
 	.mac_init		= rtw8723d_mac_init,
+	.shutdown		= rtw8723d_shutdown,
 	.read_rf		= rtw_phy_read_rf_sipi,
 	.write_rf		= rtw_phy_write_rf_reg_sipi,
 	.set_tx_power_index	= rtw8723d_set_tx_power_index,