Re: [PATCH v1] Bluetooth: hci_qca: Add qca_power_on() API to support both wcn399x and Rome power up

[Rocky Liao]

Hi Matt,

å 2020-01-08 01:31ïMatthias Kaehlcke åéï
> 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@xxxxxxxxxxxxxx>
> > ---
> >  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.