linux-kernel - Re: [PATCH 4/4] Bluetooth: hci_qca: Split qca_power

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Date:   Fri, 18 Oct 2019 16:49:06 +0530
From:   Harish Bandi <c-hbandi@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeffrey Hugo <jeffrey.l.hugo@...il.com>,
        linux-arm-msm@...r.kernel.org,
        linux-bluetooth-owner@...r.kernel.org
Subject: Re: [PATCH 4/4] Bluetooth: hci_qca: Split qca_power_setup()

On 2019-10-18 10:54, Bjorn Andersson wrote:
> Split and rename qca_power_setup() in order to simplify each code path
> and to clarify that it is unrelated to qca_power_off() and
> qca_power_setup().
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/bluetooth/hci_qca.c | 61 ++++++++++++++++++++++---------------
>  1 file changed, 36 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 01f941e9adf3..c591a8ba9d93 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -160,7 +160,8 @@ struct qca_serdev {
>  	const char *firmware_name;
>  };
> 
> -static int qca_power_setup(struct hci_uart *hu, bool on);
> +static int qca_regulator_enable(struct qca_serdev *qcadev);
> +static void qca_regulator_disable(struct qca_serdev *qcadev);
>  static void qca_power_shutdown(struct hci_uart *hu);
>  static int qca_power_off(struct hci_dev *hdev);
> 
> @@ -516,7 +517,7 @@ static int qca_open(struct hci_uart *hu)
>  		} else {
>  			hu->init_speed = qcadev->init_speed;
>  			hu->oper_speed = qcadev->oper_speed;
> -			ret = qca_power_setup(hu, true);
> +			ret = qca_regulator_enable(qcadev);
>  			if (ret) {
>  				destroy_workqueue(qca->workqueue);
>  				kfree_skb(qca->rx_skb);
> @@ -1186,7 +1187,7 @@ static int qca_wcn3990_init(struct hci_uart *hu)
>  	qcadev = serdev_device_get_drvdata(hu->serdev);
>  	if (!qcadev->bt_power->vregs_on) {
>  		serdev_device_close(hu->serdev);
> -		ret = qca_power_setup(hu, true);
> +		ret = qca_regulator_enable(qcadev);
>  		if (ret)
>  			return ret;
> 
> @@ -1351,9 +1352,12 @@ static const struct qca_vreg_data
> qca_soc_data_wcn3998 = {
> 
>  static void qca_power_shutdown(struct hci_uart *hu)
>  {
> +	struct qca_serdev *qcadev;
>  	struct qca_data *qca = hu->priv;
>  	unsigned long flags;
> 
> +	qcadev = serdev_device_get_drvdata(hu->serdev);
> +
>  	/* From this point we go into power off state. But serial port is
>  	 * still open, stop queueing the IBS data and flush all the buffered
>  	 * data in skb's.
> @@ -1365,7 +1369,7 @@ static void qca_power_shutdown(struct hci_uart 
> *hu)
> 
>  	host_set_baudrate(hu, 2400);
>  	qca_send_power_pulse(hu, false);
> -	qca_power_setup(hu, false);
> +	qca_regulator_disable(qcadev);
>  }
> 
>  static int qca_power_off(struct hci_dev *hdev)
> @@ -1381,36 +1385,43 @@ static int qca_power_off(struct hci_dev *hdev)
>  	return 0;
>  }
> 
> -static int qca_power_setup(struct hci_uart *hu, bool on)
> +static int qca_regulator_enable(struct qca_serdev *qcadev)
>  {
> -	struct regulator_bulk_data *vreg_bulk;
> -	struct qca_serdev *qcadev;
> -	int num_vregs;
> -	int ret = 0;
> +	struct qca_power *power = qcadev->bt_power;
> +	int ret;
> 
> -	qcadev = serdev_device_get_drvdata(hu->serdev);
> -	if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_bulk)
> -		return -EINVAL;
> +	/* Already enabled */
> +	if (power->vregs_on)
> +		return 0;
> 
> -	vreg_bulk = qcadev->bt_power->vreg_bulk;
> -	num_vregs = qcadev->bt_power->num_vregs;
> -	BT_DBG("on: %d (%d regulators)", on, num_vregs);
> -	if (on && !qcadev->bt_power->vregs_on) {
> -		ret = regulator_bulk_enable(num_vregs, vreg_bulk);
> -		if (ret)
> -			return ret;
> +	BT_DBG("enabling %d regulators)", power->num_vregs);
> 
> -		qcadev->bt_power->vregs_on = true;
> -	} else if (!on && qcadev->bt_power->vregs_on) {
> -		/* turn off regulator in reverse order */
> -		regulator_bulk_disable(num_vregs, vreg_bulk);
> +	ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
> +	if (ret)
> +		return ret;
> 
> -		qcadev->bt_power->vregs_on = false;
> -	}
> +	power->vregs_on = true;
> 
>  	return 0;
>  }
> 
> +static void qca_regulator_disable(struct qca_serdev *qcadev)
> +{
> +	struct qca_power *power;
> +
> +	if (!qcadev)
> +		return;
> +
> +	power = qcadev->bt_power;
> +
> +	/* Already disabled? */
> +	if (!power->vregs_on)
> +		return;
> +
> +	regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
> +	power->vregs_on = false;
> +}
> +
>  static int qca_init_regulators(struct qca_power *qca,
>  				const struct qca_vreg *vregs, size_t num_vregs)
>  {