linux-kernel - Re: [PATCH v2 1/3] Bluetooth: hci_qca: Add qca_power_on() API to support both wcn399x and Rome power up

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Message-ID: <20200108183427.GE89495@google.com>
Date:   Wed, 8 Jan 2020 10:34:27 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Rocky Liao <rjliao@...eaurora.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 1/3] Bluetooth: hci_qca: Add qca_power_on() API to
 support both wcn399x and Rome power up

Hi Rocky,

On Wed, Jan 08, 2020 at 05:08:02PM +0800, Rocky Liao wrote:
> This patch adds a unified API qca_power_on() to support both wcn399x and
> Rome power on. For wcn399x it calls the qca_wcn3990_init() to init the
> regulators, and for Rome it pulls up the bt_en GPIO to power up the btsoc.
> 
> Signed-off-by: Rocky Liao <rjliao@...eaurora.org>
> ---
> 
> Changes in v2: None
> 
>  drivers/bluetooth/hci_qca.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 9392cc7f9908..f6555bd1adbc 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -1532,6 +1532,27 @@ static int qca_wcn3990_init(struct hci_uart *hu)
>  	return 0;
>  }
>  
> +static int qca_power_on(struct hci_dev *hdev)
> +{
> +	struct hci_uart *hu = hci_get_drvdata(hdev);
> +	enum qca_btsoc_type soc_type = qca_soc_type(hu);
> +	struct qca_serdev *qcadev;
> +	int ret = 0;
> +
> +	if (qca_is_wcn399x(soc_type)) {

Why not include the qca_regulator_enable() call from qca_open() here?
It is clearly part of power on.

> +		ret = qca_wcn3990_init(hu);
> +	} else {
> +		if (hu->serdev) {

nit: you could save a level of indentation (and IMO improve
readability) by doing:

     	       if (!hu->serdev)
	            	return 0;

> +			qcadev = serdev_device_get_drvdata(hu->serdev);
> +			gpiod_set_value_cansleep(qcadev->bt_en, 1);
> +			/* Controller needs time to bootup. */
> +			msleep(150);
> +		}
> +	}
> +
> +	return ret;
> +}
> +

I think common practice would be to combine the 3 patches of this series
into one. The new function doesn't really add any new functionality, but
is a refactoring. This is more evident if you see in a single diff that
the pieces in qca_power_on() are removed elsewhere.