linux-kernel - Re: [PATCH 3/3] Bluetooth: hci_qca: Add delay after power-off pulse

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Date:   Tue, 26 Feb 2019 17:49:56 +0530
From:   Balakrishna Godavarthi <bgodavar@...eaurora.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hemantg <hemantg@...eaurora.org>
Subject: Re: [PATCH 3/3] Bluetooth: hci_qca: Add delay after power-off pulse

On 2019-02-26 05:19, Matthias Kaehlcke wrote:
> During initialization the power-on pulse is currently sent inmediately
> after the prior power-off pulse. With this initialization often fails
> at boot time:
> 
> [   15.205224] Bluetooth: hci0: setting up wcn3990
> [   17.341062] Bluetooth: hci0: command 0xfc00 tx timeout
> [   22.101453] ERROR: Bluetooth initialization failed
> [   25.337740] Bluetooth: hci0: Reading QCA version information failed 
> (-110)
> 
> After a power-off pulse wait 10ms to give the controller time to power
> off.
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>  drivers/bluetooth/hci_qca.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index eacc108c422d0..c89c1ed87ffe9 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -1036,8 +1036,11 @@ static int qca_send_power_pulse(struct hci_uart
> *hu, bool on)
>  	usleep_range(100, 200);
>  	hci_uart_set_flow_control(hu, false);
> 
> +	/* Give to controller time to boot/shutdown */
>  	if (on)
>  		msleep(100);
> +	else
> +		msleep(10);
> 
>  	return 0;
>  }

Reviewed-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>

-- 
Regards
Balakrishna.