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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Date:   Thu, 8 Aug 2019 07:59:09 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Harish Bandi <c-hbandi@...eaurora.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

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.

>  	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;
>  }