linux-kernel - Re: [PATCH v1] Bluetooth: hci_qca: wait for Pre shutdown to command complete event before sending the Power off pulse

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Message-ID: <63b81f8235932de0d46164385d972b63@codeaurora.org>
Date:   Fri, 09 Aug 2019 10:42:07 +0530
From:   Harish Bandi <c-hbandi@...eaurora.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        hemantg@...eaurora.org, linux-arm-msm@...r.kernel.org,
        bgodavar@...eaurora.org, anubhavg@...eaurora.org
Subject: Re: [PATCH v1] Bluetooth: hci_qca: wait for Pre shutdown to command
 complete event before sending the Power off pulse

Hi Matthias,

On 2019-08-08 20:29, Matthias Kaehlcke wrote:
> On Thu, Aug 08, 2019 at 02:55:53PM +0530, Harish Bandi wrote:
>> When SoC receives pre shut down command, it share the same
>> with other COEX shared clients. So SoC needs a short
>> time after sending VS pre shutdown command before
>> turning off the regulators and sending the power off pulse.
>> 
>> Signed-off-by: Harish Bandi <c-hbandi@...eaurora.org>
>> ---
>>  drivers/bluetooth/btqca.c   | 5 +++--
>>  drivers/bluetooth/hci_qca.c | 2 ++
>>  2 files changed, 5 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
>> index 2221935..f20991e 100644
>> --- a/drivers/bluetooth/btqca.c
>> +++ b/drivers/bluetooth/btqca.c
>> @@ -106,8 +106,9 @@ int qca_send_pre_shutdown_cmd(struct hci_dev 
>> *hdev)
>> 
>>  	bt_dev_dbg(hdev, "QCA pre shutdown cmd");
>> 
>> -	skb = __hci_cmd_sync(hdev, QCA_PRE_SHUTDOWN_CMD, 0,
>> -				NULL, HCI_INIT_TIMEOUT);
>> +	skb = __hci_cmd_sync_ev(hdev, QCA_PRE_SHUTDOWN_CMD, 0,
>> +				NULL, HCI_EV_CMD_COMPLETE, HCI_INIT_TIMEOUT);
>> +
> 
> The commit message does not mention this change, it only talks about
> adding a delay.

[Harish] - I will add reason fo HCI_EV_CMD_COMPLETE in commit text and 
post new patch.
In commit text title I mentioned about command complete event, However I 
will add more details
about reason for command complete in commit text

> 
>>  	if (IS_ERR(skb)) {
>>  		err = PTR_ERR(skb);
>>  		bt_dev_err(hdev, "QCA preshutdown_cmd failed (%d)", err);
>> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
>> index 16db6c0..566aa28 100644
>> --- a/drivers/bluetooth/hci_qca.c
>> +++ b/drivers/bluetooth/hci_qca.c
>> @@ -1386,6 +1386,8 @@ static int qca_power_off(struct hci_dev *hdev)
>>  	/* Perform pre shutdown command */
>>  	qca_send_pre_shutdown_cmd(hdev);
>> 
>> +	usleep_range(8000, 10000);
>> +
>>  	qca_power_shutdown(hu);
>>  	return 0;
>>  }