diff options
| author | Raghuram Hegde <raghuram.hegde@intel.com> | 2019-01-29 15:24:48 +0300 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2019-01-29 18:15:29 +0300 |
| commit | 017a01ccfbc5a35aed83acbf2ee2735f8c3efe8a (patch) | |
| tree | b0cb2687e69abede6b7570a757bc6762e17bd5af /drivers/bluetooth | |
| parent | 2de66bb87351086ce9bef37c1b98d9bae93eddcd (diff) | |
| download | linux-017a01ccfbc5a35aed83acbf2ee2735f8c3efe8a.tar.xz | |
Bluetooth: btusb: Add shutdown routine for BTUSB_INTEL_NEW devices
If BT operations (BREDR inquiry/LE scan) were triggered
through the stack, followed by BT turn off through
'hciconfig hci0 down', the controller would still be active
and consume power.
Also, there is a possibility that a race condition/
synchronization issue might arise on the subsequent BT turn
on, as the controller might try to push the
events that were queued up before processing the HCI Reset
command.
btusb_shutdown_intel_new routine shall reset the controller
and stop all BT operation.
Advantages:
1. Power save on the platform
2. Host and controller will be in Sync.
Signed-off-by: Raghuram Hegde <raghuram.hegde@intel.com>
Signed-off-by: Chethan T N <chethan.tumkur.narayan@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/bluetooth')
| -rw-r--r-- | drivers/bluetooth/btusb.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 9a890b2a7ee1..d4c8d989e714 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -2434,6 +2434,24 @@ static int btusb_shutdown_intel(struct hci_dev *hdev) return 0; } +static int btusb_shutdown_intel_new(struct hci_dev *hdev) +{ + struct sk_buff *skb; + + /* Send HCI Reset to the controller to stop any BT activity which + * were triggered. This will help to save power and maintain the + * sync b/w Host and controller + */ + skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT); + if (IS_ERR(skb)) { + bt_dev_err(hdev, "HCI reset during shutdown failed"); + return PTR_ERR(skb); + } + kfree_skb(skb); + + return 0; +} + #ifdef CONFIG_PM /* Configure an out-of-band gpio as wake-up pin, if specified in device tree */ static int marvell_config_oob_wake(struct hci_dev *hdev) @@ -3139,6 +3157,7 @@ static int btusb_probe(struct usb_interface *intf, hdev->manufacturer = 2; hdev->send = btusb_send_frame_intel; hdev->setup = btusb_setup_intel_new; + hdev->shutdown = btusb_shutdown_intel_new; hdev->hw_error = btintel_hw_error; hdev->set_diag = btintel_set_diag; hdev->set_bdaddr = btintel_set_bdaddr; |