From: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>
Observed race condition during controller recovery mechanism
resulting the controller not responding to the reset command.
To avoid such race condition need a delay of 2ms soon after the
USB re-enumeration and before sending the Reset command which shall
allow controller to completely recover and process the Reset command.
Change-Id: Ifbc387d4377bc79081244d444d45ba6effc95f23
Signed-off-by: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx>
---
drivers/bluetooth/btusb.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index f73a27ea28cc..844b4145ff76 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1741,6 +1741,15 @@ static int btusb_setup_intel(struct hci_dev *hdev)
int disable_patch, err;
struct intel_version ver;
+ /* Observed race condition during controller recovery mechanism
+ * resulting the controller not responding to the reset command.
+ *
+ * To avoid such race condition need a delay of 2ms soon after the
+ * USB re-enumeration and before sending the Reset command which shall
+ * allow controller to completely recover and process the Reset command.
+ */
+ mdelay(2);
+
BT_DBG("%s", hdev->name);
/* The controller has a bug with the first HCI command sent to it
--
2.7.4
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