linux-kernel - Re: [PATCH v3] Bluetooth: hci_qca: Add qca_power_on() API to support both wcn399x and Rome power up

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Date:   Fri, 10 Jan 2020 11:07:01 +0800
From:   Rocky Liao <rjliao@...eaurora.org>
To:     Matthias Kaehlcke <mka@...omium.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,
        linux-bluetooth-owner@...r.kernel.org
Subject: Re: [PATCH v3] Bluetooth: hci_qca: Add qca_power_on() API to support
 both wcn399x and Rome power up

Hi Matt,

在 2020-01-10 03:05，Matthias Kaehlcke 写道：
> Hi Rocky,
> 
> On Thu, Jan 09, 2020 at 01:14:27PM +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.
>> It also moves all the power up operation from hdev->open() to
>> hdev->setup().
>> 
>> Signed-off-by: Rocky Liao <rjliao@...eaurora.org>
>> ---
>> 
>> Changes in v2: None
>> Changes in v3:
>>   -combined the changes of patch 2 and 3 into this patch
> 
> it would be better to actually describe what was done, "patch 2 and 3"
> doesn't provide much useful information.
> 
OK, will update that

>>   -updated the commit message
>> 
>>  drivers/bluetooth/hci_qca.c | 46 
>> ++++++++++++++++++++++++-------------
>>  1 file changed, 30 insertions(+), 16 deletions(-)
>> 
>> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
>> index 82e4cd4b6663..427e381a08b4 100644
>> --- a/drivers/bluetooth/hci_qca.c
>> +++ b/drivers/bluetooth/hci_qca.c
>> @@ -541,7 +541,6 @@ static int qca_open(struct hci_uart *hu)
>>  {
>>  	struct qca_serdev *qcadev;
>>  	struct qca_data *qca;
>> -	int ret;
>> 
>>  	BT_DBG("hu %p qca_open", hu);
>> 
>> @@ -582,23 +581,10 @@ static int qca_open(struct hci_uart *hu)
>>  	hu->priv = qca;
>> 
>>  	if (hu->serdev) {
>> -
>>  		qcadev = serdev_device_get_drvdata(hu->serdev);
>> -		if (!qca_is_wcn399x(qcadev->btsoc_type)) {
>> -			gpiod_set_value_cansleep(qcadev->bt_en, 1);
>> -			/* Controller needs time to bootup. */
>> -			msleep(150);
>> -		} else {
>> +		if (qca_is_wcn399x(qcadev->btsoc_type)) {
>>  			hu->init_speed = qcadev->init_speed;
>>  			hu->oper_speed = qcadev->oper_speed;
>> -			ret = qca_regulator_enable(qcadev);
>> -			if (ret) {
>> -				destroy_workqueue(qca->workqueue);
>> -				kfree_skb(qca->rx_skb);
>> -				hu->priv = NULL;
>> -				kfree(qca);
>> -				return ret;
>> -			}
>>  		}
>>  	}
>> 
>> @@ -1531,6 +1517,31 @@ 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;
>> +
>> +	/* Non-serdev device usually is powered by external power
>> +	 * and don't need additional action in driver for power on
>> +	 */
>> +	if (!hu->serdev)
>> +		return 0;
>> +
>> +	if (qca_is_wcn399x(soc_type)) {
>> +		ret = qca_wcn3990_init(hu);
> 
> Since there is no real need to add the qca_regulator_enable() call from
> qca_open() here qca_power_on() is now essentially a fancy wrapper for
> qca_wcn3990_init(), but I guess that's ok.
> 
>> +	} else {
>> +		qcadev = serdev_device_get_drvdata(hu->serdev);
>> +		gpiod_set_value_cansleep(qcadev->bt_en, 1);
>> +		/* Controller needs time to bootup. */
>> +		msleep(150);
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>>  static int qca_setup(struct hci_uart *hu)
>>  {
>>  	struct hci_dev *hdev = hu->hdev;
>> @@ -1562,7 +1573,7 @@ static int qca_setup(struct hci_uart *hu)
>>  		set_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks);
>>  		set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
>>  		hu->hdev->shutdown = qca_power_off;
>> -		ret = qca_wcn3990_init(hu);
>> +		ret = qca_power_on(hdev);
>>  		if (ret)
>>  			return ret;
>> 
>> @@ -1571,6 +1582,9 @@ static int qca_setup(struct hci_uart *hu)
>>  			return ret;
>>  	} else {
>>  		bt_dev_info(hdev, "ROME setup");
>> +		ret = qca_power_on(hdev);
>> +		if (ret)
>> +			return ret;
>>  		qca_set_speed(hu, QCA_INIT_SPEED);
>>  	}
> 
> It would be nice if we could get away with a single qca_power_on() call
> for WCN399x and ROME. How about this before 'if 
> (qca_is_wcn399x(soc_type))':
> 
> 	bt_dev_info(hdev, "setting up %s",
> 		qca_is_wcn399x(soc_type)? "wcn399x" : "ROME");
> 
> 	ret = qca_power_on(hdev);
> 	if (ret)
> 		return ret;
> 
> 
> In any case:
> 
> Reviewed-by: Matthias Kaehlcke <mka@...omium.org>

Makes sense will do that