[PATCH v2 1/2] Bluetooth: btusb: fix up firmware download sequence

[sean.wang]

From: Sean Wang <sean.w...@mediatek.com>

Data RAM on the device have to be powered on before starting to download
the firmware.

v1->v2:
        rebased to bluetooth-next

Fixes: a1c49c434e15 ("Bluetooth: btusb: Add protocol support for MediaTek 
MT7668U USB devices")
Co-developed-by: Mark Chen <mark-yw.c...@mediatek.com>
Signed-off-by: Mark Chen <mark-yw.c...@mediatek.com>
Signed-off-by: Sean Wang <sean.w...@mediatek.com>
---
 drivers/bluetooth/btusb.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index c7cc8e594166..e42fdd625eb0 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -2934,7 +2934,7 @@ static int btusb_mtk_setup_firmware(struct hci_dev *hdev, 
const char *fwname)
        const u8 *fw_ptr;
        size_t fw_size;
        int err, dlen;
-       u8 flag;
+       u8 flag, param;
 
        err = request_firmware(&fw, fwname, &hdev->dev);
        if (err < 0) {
@@ -2942,6 +2942,20 @@ static int btusb_mtk_setup_firmware(struct hci_dev 
*hdev, const char *fwname)
                return err;
        }
 
+       /* Power on data RAM the firmware relies on. */
+       param = 1;
+       wmt_params.op = BTMTK_WMT_FUNC_CTRL;
+       wmt_params.flag = 3;
+       wmt_params.dlen = sizeof(param);
+       wmt_params.data = &param;
+       wmt_params.status = NULL;
+
+       err = btusb_mtk_hci_wmt_sync(hdev, &wmt_params);
+       if (err < 0) {
+               bt_dev_err(hdev, "Failed to power on data RAM (%d)", err);
+               return err;
+       }
+
        fw_ptr = fw->data;
        fw_size = fw->size;
 
-- 
2.25.1