linux-kernel - Re: [PATCH v10 4/7] Bluetooth: hci_qca: Add wrapper functions for setting UART speed

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Date:   Wed, 25 Jul 2018 10:02:33 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Balakrishna Godavarthi <bgodavar@...eaurora.org>
Cc:     marcel@...tmann.org, johan.hedberg@...il.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-bluetooth@...r.kernel.org, thierry.escande@...aro.org,
        rtatiya@...eaurora.org, hemantg@...eaurora.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v10 4/7] Bluetooth: hci_qca: Add wrapper functions for
 setting UART speed

On Tue, Jul 24, 2018 at 12:32:36PM +0530, Balakrishna Godavarthi wrote:
> Hi Matthias,
> 
> On 2018-07-23 23:26, Matthias Kaehlcke wrote:
> > On Fri, Jul 20, 2018 at 07:02:40PM +0530, Balakrishna Godavarthi wrote:
> > > In function qca_setup, we set initial and operating speeds for
> > > Qualcomm
> > > Bluetooth SoC's. This block of code is common across different
> > > Qualcomm Bluetooth SoC's. Instead of duplicating the code, created
> > > a wrapper function to set the speeds. So that future coming SoC's
> > > can use these wrapper functions to set speeds.
> > > 
> > > Signed-off-by: Balakrishna Godavarthi <bgodavar@...eaurora.org>
> > > Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
> > > ---
> > >  drivers/bluetooth/hci_qca.c | 93
> > > ++++++++++++++++++++++++++++---------
> > >  1 file changed, 70 insertions(+), 23 deletions(-)
> > > 
> > > diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> > > index 5f1c0a8fd5cd..5f8a74d65bec 100644
> > > --- a/drivers/bluetooth/hci_qca.c
> > > +++ b/drivers/bluetooth/hci_qca.c
> > > @@ -119,6 +119,11 @@ struct qca_data {
> > >  	u64 votes_off;
> > >  };
> > > 
> > > +enum qca_speed_type {
> > > +	QCA_INIT_SPEED = 1,
> > > +	QCA_OPER_SPEED
> > > +};
> > > +
> > >  struct qca_serdev {
> > >  	struct hci_uart	 serdev_hu;
> > >  	struct gpio_desc *bt_en;
> > > @@ -923,6 +928,61 @@ static inline void host_set_baudrate(struct
> > > hci_uart *hu, unsigned int speed)
> > >  		hci_uart_set_baudrate(hu, speed);
> > >  }
> > > 
> > > +static unsigned int qca_get_speed(struct hci_uart *hu,
> > > +				  enum qca_speed_type speed_type)
> > > +{
> > > +	unsigned int speed = 0;
> > > +
> > > +	if (speed_type == QCA_INIT_SPEED) {
> > > +		if (hu->init_speed)
> > > +			speed = hu->init_speed;
> > > +		else if (hu->proto->init_speed)
> > > +			speed = hu->proto->init_speed;
> > > +	} else {
> > > +		if (hu->oper_speed)
> > > +			speed = hu->oper_speed;
> > > +		else if (hu->proto->oper_speed)
> > > +			speed = hu->proto->oper_speed;
> > > +	}
> > > +
> > > +	return speed;
> > > +}
> > > +
> > > +static int qca_check_speeds(struct hci_uart *hu)
> > > +{
> > > +	if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
> > > +	    !qca_get_speed(hu, QCA_OPER_SPEED))
> > > +		return -EINVAL;
> > 
> > You changed this from:
> > 
> > 	/* One or the other speeds should be non zero. */
> > 	if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
> > 	    !qca_get_speed(hu, QCA_OPER_SPEED))
> > 		return -EINVAL;
> > 
> > There is no entry in the change log. What is the reason for this
> > change?
> 
> [Bala] : My bad i missed to add the log,as the above  if for ROME chip,
> having INIT or OPER speed is fine.

Ok, thanks for the clarification, I recall this was discussed earlier.