linux-kernel - Re: [PATCH 1/4] Bluetooth: hci_qca: Update regulator_set

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Date:   Fri, 18 Oct 2019 16:48:15 +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 1/4] Bluetooth: hci_qca: Update regulator_set_load() usage

On 2019-10-18 10:54, Bjorn Andersson wrote:
> Since the introduction of '5451781dadf8 ("regulator: core: Only count
> load for enabled consumers")' in v5.0, the requested load of a 
> regulator
> consumer is only accounted for when said consumer is voted enabled.
> 
> So there's no need to vote for load ever time the regulator is
> enabled or disabled.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/bluetooth/hci_qca.c | 33 ++++++++++++++++++---------------
>  1 file changed, 18 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index e3164c200eac..c07c529b0d81 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -1393,13 +1393,6 @@ static int qca_enable_regulator(struct qca_vreg 
> vregs,
>  	if (ret)
>  		return ret;
> 
> -	if (vregs.load_uA)
> -		ret = regulator_set_load(regulator,
> -					 vregs.load_uA);
> -
> -	if (ret)
> -		return ret;
> -
>  	return regulator_enable(regulator);
> 
>  }
> @@ -1409,8 +1402,6 @@ static void qca_disable_regulator(struct qca_vreg 
> vregs,
>  {
>  	regulator_disable(regulator);
>  	regulator_set_voltage(regulator, 0, vregs.max_uV);
> -	if (vregs.load_uA)
> -		regulator_set_load(regulator, 0);
> 
>  }
> 
> @@ -1462,18 +1453,30 @@ static int qca_power_setup(struct hci_uart *hu, 
> bool on)
>  static int qca_init_regulators(struct qca_power *qca,
>  				const struct qca_vreg *vregs, size_t num_vregs)
>  {
> +	struct regulator_bulk_data *bulk;
> +	int ret;
>  	int i;
> 
> -	qca->vreg_bulk = devm_kcalloc(qca->dev, num_vregs,
> -				      sizeof(struct regulator_bulk_data),
> -				      GFP_KERNEL);
> -	if (!qca->vreg_bulk)
> +	bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
> +	if (!bulk)
>  		return -ENOMEM;
> 
>  	for (i = 0; i < num_vregs; i++)
> -		qca->vreg_bulk[i].supply = vregs[i].name;
> +		bulk[i].supply = vregs[i].name;
> +
> +	ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
> +	if (ret < 0)
> +		return ret;
> 
> -	return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
> +	for (i = 0; i < num_vregs; i++) {
> +		ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	qca->vreg_bulk = bulk;
> +
> +	return 0;
>  }
> 
>  static int qca_serdev_probe(struct serdev_device *serdev)