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

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Date:   Mon, 23 Jul 2018 10:56:11 -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 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?