Hi Amit,
>>> In case of BT turn off from UI it is safe to add HCI reset command
>>> which will maintain the controller state.
>>
>> this needs to be a bit more details since hdev->shutdown handling is really only for the older Intel controllers.
>
>> Also I am failing to see why HCI Reset helps or what it does here. It is going to be called again on hdev->open the next time the controller is activated.
>>
>>>
>>> Signed-off-by: Amit K Bag <amit.k.bag@xxxxxxxxx>
>>> ---
>>> drivers/bluetooth/btusb.c | 12 ++++++++++++
>>> 1 file changed, 12 insertions(+)
>>>
>>> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
>>> index 572fd75fbcf6..599ec9b12d3f 100644
>>> --- a/drivers/bluetooth/btusb.c
>>> +++ b/drivers/bluetooth/btusb.c
>>> @@ -2369,6 +2369,18 @@ static int btusb_shutdown_intel(struct hci_dev *hdev)
>>> struct sk_buff *skb;
>>> long ret;
>>>
>>> + /* In case of BT off from UI it is safe to do HCI reset.
>>> + * This will maintain the controller state.
>>> + */
>>
>> I do not care what the UI does here. This is power down operation and so it needs to be explained properly. And with a lot more details since I am failing to understand what state is maintained on HCI Reset. As per specification it will reset all Bluetooth > > states back to the defaults.
>>
>>> + skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
>>> + if (IS_ERR(skb)) {
>>> + ret = PTR_ERR(skb);
>>> + BT_ERR("%s: BT controller HCI reset failed (%ld)",
>>> + hdev->name, ret);
>>> + return ret;
>>> + }
>>> + kfree_skb(skb);
>>> +
>>
>>> There is whitespace damage here. And if this hasn’t been done yet, please first start using bt_dev_err instead of BT_ERR for the Intel parts.
>>
>>> /* 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.
>>
>> Regards
>>
>> Marcel
>
>
> I have updated the patch as per your comments. Please find the patch as below.
>
> Issue description: Intel 2765 shares the same RF with Wifi and BT.
7265 ?
> 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: Amit K Bag <amit.k.bag@xxxxxxxxx>
> ---
> drivers/bluetooth/btusb.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 572fd75fbcf6..4a3b6a7dc86f 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -2369,6 +2369,21 @@ static int btusb_shutdown_intel(struct hci_dev *hdev)
> struct sk_buff *skb;
> long ret;
>
> + /* ISSUE: In shutdown sequence where BT turn off and followed
Scrap the word ISSUE: since that is not needed. Just describe why we are doing this.
> + * by WiFi turn off, and if Wifi is turn on back, Wifi is unable
> + * to do the RF calibration.(observe this on INTEL 7265)
No need for the text in ()
> + *
> + * Solution: before shutdown BT ensure any RF activity to clear
> + * by send this command.
> + */
Scrap the Solution: and bring this in as proper sentence.
> + 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, "%s: HCI reset failed\n", __func__);
Scrap the __func__ usage. We are not doing this. Also no \n with the bt_dev_err. If you want this clear then "HCI reset on 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.
Regards
Marcel
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