linux-kernel - Re: [PATCH v2 1/3] Bluetooth: hci_qca: Add qca_power_on() API to support both wcn399x and Rome power up

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Date:   Thu, 09 Jan 2020 11:22:21 +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 v2 1/3] Bluetooth: hci_qca: Add qca_power_on() API to
 support both wcn399x and Rome power up

Hi Matt,

在 2020-01-09 02:34，Matthias Kaehlcke 写道：
> Hi Rocky,
> 
> On Wed, Jan 08, 2020 at 05:08:02PM +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.
>> 
>> Signed-off-by: Rocky Liao <rjliao@...eaurora.org>
>> ---
>> 
>> Changes in v2: None
>> 
>>  drivers/bluetooth/hci_qca.c | 21 +++++++++++++++++++++
>>  1 file changed, 21 insertions(+)
>> 
>> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
>> index 9392cc7f9908..f6555bd1adbc 100644
>> --- a/drivers/bluetooth/hci_qca.c
>> +++ b/drivers/bluetooth/hci_qca.c
>> @@ -1532,6 +1532,27 @@ 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;
>> +
>> +	if (qca_is_wcn399x(soc_type)) {
> 
> Why not include the qca_regulator_enable() call from qca_open() here?
> It is clearly part of power on.
> 
OK

>> +		ret = qca_wcn3990_init(hu);
>> +	} else {
>> +		if (hu->serdev) {
> 
> nit: you could save a level of indentation (and IMO improve
> readability) by doing:
> 
>      	       if (!hu->serdev)
> 	            	return 0;
> 
OK

>> +			qcadev = serdev_device_get_drvdata(hu->serdev);
>> +			gpiod_set_value_cansleep(qcadev->bt_en, 1);
>> +			/* Controller needs time to bootup. */
>> +			msleep(150);
>> +		}
>> +	}
>> +
>> +	return ret;
>> +}
>> +
> 
> I think common practice would be to combine the 3 patches of this 
> series
> into one. The new function doesn't really add any new functionality, 
> but
> is a refactoring. This is more evident if you see in a single diff that
> the pieces in qca_power_on() are removed elsewhere.
OK