[PATCH] Bluetooth: btusb: mediatek: Support auto revert for MT7922

[Hao Qin]

Add support for auto reverting MT7922 during reset process.

Signed-off-by: Hao Qin <hao.qin at mediatek.com>
---
 drivers/bluetooth/btusb.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 4c0cc13adb47..0ad96ec8d31d 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3032,7 +3032,16 @@ static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
 	usb_kill_anchored_urbs(&data->tx_anchor);
 	mediatek = hci_get_priv(hdev);
 
-	if (mediatek->dev_id == 0x7925) {
+	if (mediatek->dev_id == 0x7922) {
+		btusb_mtk_uhw_reg_read(data, MTK_BT_SUBSYS_RST, &val);
+		val |= 0x00002020;
+		btusb_mtk_uhw_reg_write(data, MTK_BT_SUBSYS_RST, val);
+		btusb_mtk_uhw_reg_write(data, MTK_EP_RST_OPT, 0x00010001);
+		btusb_mtk_uhw_reg_read(data, MTK_BT_SUBSYS_RST, &val);
+		val |= BIT(0);
+		btusb_mtk_uhw_reg_write(data, MTK_BT_SUBSYS_RST, val);
+		msleep(100);
+	} else if (mediatek->dev_id == 0x7925) {
 		btusb_mtk_uhw_reg_read(data, MTK_BT_RESET_REG_CONNV3, &val);
 		val |= (1 << 5);
 		btusb_mtk_uhw_reg_write(data, MTK_BT_RESET_REG_CONNV3, val);
@@ -3072,6 +3081,9 @@ static int btusb_mtk_reset(struct hci_dev *hdev, void *rst_data)
 	if (err < 0)
 		bt_dev_err(hdev, "Reset timeout");
 
+	if (mediatek->dev_id == 0x7922)
+		btusb_mtk_uhw_reg_write(data, MTK_UDMA_INT_STA_BT, 0x000000FF);
+
 	btusb_mtk_id_get(data, 0x70010200, &val);
 	if (!val)
 		bt_dev_err(hdev, "Can't get device id, subsys reset fail.");
-- 
2.18.0