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Date:   Wed, 08 Jan 2020 11:02:45 +0800
From:   Rocky Liao <rjliao@codeaurora.org>
To:     Matthias Kaehlcke <mka@chromium.org>
Cc:     marcel@holtmann.org, johan.hedberg@gmail.com,
        linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org,
        linux-arm-msm@vger.kernel.org,
        linux-bluetooth-owner@vger.kernel.org
Subject: Re: [PATCH v1] Bluetooth: hci_qca: Add qca_power_on() API to support
 both wcn399x and Rome power up
In-Reply-To: <20200107173149.GD89495@google.com>
References: <20200107052601.32216-1-rjliao@codeaurora.org>
 <20200107173149.GD89495@google.com>
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Hi Matt,

在 2020-01-08 01:31，Matthias Kaehlcke 写道：
> Hi Rocky,
> 
> On Tue, Jan 07, 2020 at 01:26:01PM +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@codeaurora.org>
>> ---
>>  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;
> 
> another option would be to return directly from the if/else branches,
> but either way is fine.
> 
>> +
>> +	if (qca_is_wcn399x(soc_type)) {
>> +		ret = qca_wcn3990_init(hu);
>> +	} else {
>> +		if (hu->serdev) {
>> +			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 expected qca_power_on() would be called from qca_open(), but as is
> this would only work for ROME, and not WCN399x, which only enables
> the regulators in qca_open(), qca_wcn3990_init() is called from
> qca_setup(). Is there a particular reason for this assymmetry between
> the ROME and WCN399x initialization (i.e. one is fully powered up after
> open(), the other not)?

I prefer to move the power on call from qca_open() to qca_setup() for 
Rome,
I don't see any reason for this difference with wcn399x.I will send 
patch for
this if you have no concern.