linux-kernel - Re: [PATCH v1] Bluetooth: hci_qca: Enable clocks required for BT SOC

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Message-ID: <0101016e7d1a6a67-d4af94cf-407a-4215-bd48-82d33990d5bb-000000@us-west-2.amazonses.com>
Date:   Mon, 18 Nov 2019 06:01:53 +0000
From:   bgodavar@...eaurora.org
To:     Marcel Holtmann <marcel@...tmann.org>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-bluetooth@...r.kernel.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org, tientzu@...omium.org,
        seanpaul@...omium.org
Subject: Re: [PATCH v1] Bluetooth: hci_qca: Enable clocks required for BT SOC

On 2019-11-14 14:25, Marcel Holtmann wrote:
> Hi Balakrishna,
> 
>> Instead of relying on other subsytem to turn ON clocks
>> required for BT SoC to operate, voting them from the driver.
>> 
>> Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
>> ---
>> drivers/bluetooth/hci_qca.c | 31 +++++++++++++++++++++++++++++--
>> 1 file changed, 29 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
>> index f10bdf8e1fc5..dc95e378574b 100644
>> --- a/drivers/bluetooth/hci_qca.c
>> +++ b/drivers/bluetooth/hci_qca.c
>> @@ -164,6 +164,7 @@ struct qca_serdev {
>> };
>> 
>> static int qca_regulator_enable(struct qca_serdev *qcadev);
>> +static int qca_power_on(struct qca_serdev *qcadev);
> 
> I really dislike forward declaration. Only use them if they are really
> really needed. That said, this driver might actually need cleanups
> since I just realized it has tons of forward declarations.
> 

[Bala]: agree, will work on this change.

>> 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);
>> @@ -528,7 +529,7 @@ static int qca_open(struct hci_uart *hu)
>> 		} else {
>> 			hu->init_speed = qcadev->init_speed;
>> 			hu->oper_speed = qcadev->oper_speed;
>> -			ret = qca_regulator_enable(qcadev);
>> +			ret = qca_power_on(qcadev);
>> 			if (ret) {
>> 				destroy_workqueue(qca->workqueue);
>> 				kfree_skb(qca->rx_skb);
>> @@ -1214,7 +1215,7 @@ 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_regulator_enable(qcadev);
>> +		ret = qca_power_on(qcadev);
>> 		if (ret)
>> 			return ret;
>> 
>> @@ -1408,6 +1409,9 @@ static void qca_power_shutdown(struct hci_uart 
>> *hu)
>> 	host_set_baudrate(hu, 2400);
>> 	qca_send_power_pulse(hu, false);
>> 	qca_regulator_disable(qcadev);
>> +
>> +	if (qcadev->susclk)
>> +		clk_disable_unprepare(qcadev->susclk);
>> }
>> 
>> static int qca_power_off(struct hci_dev *hdev)
>> @@ -1423,6 +1427,20 @@ static int qca_power_off(struct hci_dev *hdev)
>> 	return 0;
>> }
>> 
>> +static int qca_power_on(struct qca_serdev *qcadev)
>> +{
>> +	int err;
>> +
>> +	if (qcadev->susclk) {
>> +		err = clk_prepare_enable(qcadev->susclk);
>> +		if (err)
>> +			return err;
>> +	}
>> +
>> +	qca_regulator_enable(qcadev);
>> +	return 0;
>> +}
>> +
>> static int qca_regulator_enable(struct qca_serdev *qcadev)
>> {
>> 	struct qca_power *power = qcadev->bt_power;
>> @@ -1523,6 +1541,15 @@ static int qca_serdev_probe(struct 
>> serdev_device *serdev)
>> 
>> 		qcadev->bt_power->vregs_on = false;
>> 
>> +		if (qcadev->btsoc_type == QCA_WCN3990 ||
>> +		    qcadev->btsoc_type == QCA_WCN3991) {
> 
> There comes a point when using a switch statement is a lot easier to
> read. See if that has been reached and if there are other places that
> would benefit from a cleanup patch.
> 

[Bala] : will work on this.

> Regards
> 
> Marcel