Mailing List Archive

From: Hao Qin <hao.qin@mediatek.com>

Add the support of MT7922 bluetooth subsystem reset that was called the
auto revert to self-recover from the fatal error in the controller like
the host encounters HCI cmd timeout or the controller crashes.

Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Hao Qin <hao.qin@mediatek.com>
---
v3: split from the v2 to make the patch do one thing in a patch.
---
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 6cfeec2118e9..3485fefc8bad 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -3002,7 +3002,16 @@ static int btusb_mtk_subsys_reset(struct hci_dev *hdev, u32 dev_id)
u32 val;
int err;

- if (dev_id == 0x7925) {
+ if (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 (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);
@@ -3042,6 +3051,9 @@ static int btusb_mtk_subsys_reset(struct hci_dev *hdev, u32 dev_id)
if (err < 0)
bt_dev_err(hdev, "Reset timeout");

+ if (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.");
--
2.25.1