Commit 1313bccf authored by Amit K Bag's avatar Amit K Bag Committed by Marcel Holtmann

Bluetooth: btusb: Release RF resource on BT shutdown

Issue description: Intel 7265 shares the same RF with Wifi and BT.
In the shutdown scenario turn off BT, followed by turn WiFi off
and on causing error in RF calibration in WiFi Module

Solution: before shutdown BT ensure any RF activity to clear by
HCI reset command.

Reference Logs:
ERR kernel: [ 386.193284] iwlwifi 0000:01:00.0: Failed to run INIT calibrations: -5
ERR kernel: [ 386.193298] iwlwifi 0000:01:00.0: Failed to run INIT ucode: -5
ERR kernel: [ 386.193309] iwlwifi 0000:01:00.0: Failed to start RT ucode: -5
Signed-off-by: default avatarAmit K Bag <amit.k.bag@intel.com>
Singed-off-by: default avatarChethan T N <chethan.tumkur.narayan@intel.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 7992c188
......@@ -2369,6 +2369,22 @@ static int btusb_shutdown_intel(struct hci_dev *hdev)
struct sk_buff *skb;
long ret;
/* In the shutdown sequence where Bluetooth is turned off followed
* by WiFi being turned off, turning WiFi back on causes issue with
* the RF calibration.
*
* To ensure that any RF activity has been stopped, issue HCI Reset
* command to clear all ongoing activity including advertising,
* scanning etc.
*/
skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
ret = PTR_ERR(skb);
bt_dev_err(hdev, "HCI reset during shutdown failed");
return ret;
}
kfree_skb(skb);
/* Some platforms have an issue with BT LED when the interface is
* down or BT radio is turned off, which takes 5 seconds to BT LED
* goes off. This command turns off the BT LED immediately.
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment