linux-kernel - Re: [PATCH v2 1/2] Bluetooth: hci_qca: Enable clocks required for BT SOC

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Date:   Wed, 05 Feb 2020 16:07:57 +0530
From:   gubbaven@...eaurora.org
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Johan Hedberg <johan.hedberg@...il.com>, mka@...omium.org,
        linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        robh@...nel.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org, bgodavar@...eaurora.org,
        tientzu@...omium.org, seanpaul@...omium.org, rjliao@...eaurora.org,
        yshavit@...gle.com
Subject: Re: [PATCH v2 1/2] Bluetooth: hci_qca: Enable clocks required for BT
 SOC

Hi Bjorn,

On 2020-02-04 14:34, Marcel Holtmann wrote:
> Hi Bjorn,
> 
>>> Instead of relying on other subsytem to turn ON clocks
>>> required for BT SoC to operate, voting them from the driver.
>>> 
>>> Signed-off-by: Venkata Lakshmi Narayana Gubba 
>>> <gubbaven@...eaurora.org>
>>> ---
>>> v2:
>>>   * addressed forward declarations
>>>   * updated with devm_clk_get_optional()
>>> 
>>> ---
>>> drivers/bluetooth/hci_qca.c | 25 +++++++++++++++++++++++++
>>> 1 file changed, 25 insertions(+)
>>> 
>>> diff --git a/drivers/bluetooth/hci_qca.c 
>>> b/drivers/bluetooth/hci_qca.c
>>> index d6e0c99..73706f3 100644
>>> --- a/drivers/bluetooth/hci_qca.c
>>> +++ b/drivers/bluetooth/hci_qca.c
>>> @@ -1738,6 +1738,15 @@ static int qca_power_off(struct hci_dev *hdev)
>>> 	return 0;
>>> }
>>> 
>>> +static int qca_setup_clock(struct clk *clk, bool enable)
>>> +{
>>> +	if (enable)
>>> +		return clk_prepare_enable(clk);
>>> +
>>> +	clk_disable_unprepare(clk);
>>> +	return 0;
>>> +}
>> 
>> As Marcel requested, inline these.
>> 
>>> +
>>> static int qca_regulator_enable(struct qca_serdev *qcadev)
>>> {
>>> 	struct qca_power *power = qcadev->bt_power;
>>> @@ -1755,6 +1764,13 @@ static int qca_regulator_enable(struct 
>>> qca_serdev *qcadev)
>>> 
>>> 	power->vregs_on = true;
>>> 
>>> +	ret = qca_setup_clock(qcadev->susclk, true);
>>> +	if (ret) {
>>> +		/* Turn off regulators to overcome power leakage */
>> 
>> You can omit this comment as well, as the name of the function you 
>> call
>> is aptly named.
[Venkata] :
We will update in next patch set.
>> 
>>> +		qca_regulator_disable(qcadev);
>>> +		return ret;
>> 
>> Just return ret below instead.
[Venkata] :
We will update in next patch set
>> 
>>> +	}
>>> +
>>> 	return 0;
>>> }
>>> 
>>> @@ -1773,6 +1789,9 @@ static void qca_regulator_disable(struct 
>>> qca_serdev *qcadev)
>>> 
>>> 	regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
>>> 	power->vregs_on = false;
>>> +
>>> +	if (qcadev->susclk)
>> 
>> In the enable path you (correctly) rely on passing NULL to the clock
>> code, so do the same here.
[Venkata] :
We will update in next patch set.
> 
> I already pushed the patch, but I am happy to accept a cleanup patch.
> 
> Regards
> 
> Marcel

Regards,
Venkata.