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Date:   Mon, 25 Mar 2019 09:21:18 -0700
From:   Matthias Kaehlcke <mka@chromium.org>
To:     Harish Bandi <c-hbandi@codeaurora.org>
Cc:     marcel@holtmann.org, johan.hedberg@gmail.com,
        linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org,
        hemantg@codeaurora.org, linux-arm-msm@vger.kernel.org,
        bgodavar@codeaurora.org, anubhavg@codeaurora.org,
        devicetree@vger.kernel.org, mark.rutland@arm.com,
        robh+dt@kernel.org
Subject: Re: [PATCH v4 1/2] Bluetooth: hci_qca: Added support for WCN3998
Message-ID: <20190325162118.GV112750@google.com>
References: <1553513800-27611-1-git-send-email-c-hbandi@codeaurora.org>
 <1553513800-27611-2-git-send-email-c-hbandi@codeaurora.org>
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On Mon, Mar 25, 2019 at 05:06:39PM +0530, Harish Bandi wrote:
> Added new compatible for WCN3998 and corresponding voltage
> and current values to WCN3998 compatible.
> Changed driver code to support WCN3998
> 
> Signed-off-by: Harish Bandi <c-hbandi@codeaurora.org>
> ---
> Changes in V4:
> - Added is_qca_soc_type_wcn399x_family helper function 
> - to get the soc type is wcn399x or not.
> ---
>  drivers/bluetooth/btqca.c   |  4 ++--
>  drivers/bluetooth/btqca.h   |  3 ++-
>  drivers/bluetooth/hci_qca.c | 48 ++++++++++++++++++++++++++++++++-------------
>  3 files changed, 38 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
> index 6122685..70cab13 100644
> --- a/drivers/bluetooth/btqca.c
> +++ b/drivers/bluetooth/btqca.c
> @@ -344,7 +344,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  
>  	/* Download rampatch file */
>  	config.type = TLV_TYPE_PATCH;
> -	if (soc_type == QCA_WCN3990) {
> +	if (soc_type >= QCA_WCN3990) {

Move qca_is_wcn399x() to btqca.c and use it here. Export the symbol
and declare the function in btqca.h, so it can be used in hci_qca.c

>  		/* Firmware files to download are based on ROM version.
>  		 * ROM version is derived from last two bytes of soc_ver.
>  		 */
> @@ -365,7 +365,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
>  
>  	/* Download NVM configuration */
>  	config.type = TLV_TYPE_NVM;
> -	if (soc_type == QCA_WCN3990)
> +	if (soc_type >= QCA_WCN3990)

use qca_is_wcn399x()

>  		snprintf(config.fwname, sizeof(config.fwname),
>  			 "qca/crnv%02x.bin", rom_ver);
>  	else
> diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
> index c72c56e..bd6a902 100644
> --- a/drivers/bluetooth/btqca.h
> +++ b/drivers/bluetooth/btqca.h
> @@ -132,7 +132,8 @@ enum qca_btsoc_type {
>  	QCA_INVALID = -1,
>  	QCA_AR3002,
>  	QCA_ROME,
> -	QCA_WCN3990
> +	QCA_WCN3990,
> +	QCA_WCN3998,
>  };
>  
>  #if IS_ENABLED(CONFIG_BT_QCA)
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index 4ea995d..e238c2b 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> @@ -189,6 +189,14 @@ static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
>  	return soc_type;
>  }
>  
> +bool is_qca_soc_type_wcn399x_family(enum qca_btsoc_type soc_type)

This long function name doesn't provide much value and degrades
readability of the code that uses it. A short name like
qca_is_wcn399x() is clear enough and friendlier to the code reader's
eyes.

> +{
> +	if ((soc_type  == QCA_WCN3990) || (soc_type  == QCA_WCN3998))
> +		return true;
> +
> +	return false;
> +}
> +
>  static void __serial_clock_on(struct tty_struct *tty)
>  {
>  	/* TODO: Some chipset requires to enable UART clock on client
> @@ -521,7 +529,7 @@ static int qca_open(struct hci_uart *hu)
>  	if (hu->serdev) {
>  
>  		qcadev = serdev_device_get_drvdata(hu->serdev);
> -		if (qcadev->btsoc_type != QCA_WCN3990) {
> +		if (!is_qca_soc_type_wcn399x_family(qcadev->btsoc_type)) {
>  			gpiod_set_value_cansleep(qcadev->bt_en, 1);
>  		} else {
>  			hu->init_speed = qcadev->init_speed;
> @@ -627,7 +635,7 @@ static int qca_close(struct hci_uart *hu)
>  
>  	if (hu->serdev) {
>  		qcadev = serdev_device_get_drvdata(hu->serdev);
> -		if (qcadev->btsoc_type == QCA_WCN3990)
> +		if (is_qca_soc_type_wcn399x_family(qcadev->btsoc_type))
>  			qca_power_shutdown(hu);
>  		else
>  			gpiod_set_value_cansleep(qcadev->bt_en, 0);
> @@ -1008,7 +1016,7 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
>  		      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
>  
>  	/* Give the controller time to process the request */
> -	if (qca_soc_type(hu) == QCA_WCN3990)
> +	if (is_qca_soc_type_wcn399x_family(qca_soc_type(hu)))
>  		msleep(10);
>  	else
>  		msleep(300);
> @@ -1084,7 +1092,7 @@ static unsigned int qca_get_speed(struct hci_uart *hu,
>  
>  static int qca_check_speeds(struct hci_uart *hu)
>  {
> -	if (qca_soc_type(hu) == QCA_WCN3990) {
> +	if (is_qca_soc_type_wcn399x_family(qca_soc_type(hu)) >= QCA_WCN3990) {

Why '>= QCA_WCN3990'?

>  		if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
>  		    !qca_get_speed(hu, QCA_OPER_SPEED))
>  			return -EINVAL;
> @@ -1116,7 +1124,7 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
>  		/* Disable flow control for wcn3990 to deassert RTS while
>  		 * changing the baudrate of chip and host.
>  		 */
> -		if (soc_type == QCA_WCN3990)
> +		if (is_qca_soc_type_wcn399x_family(soc_type))
>  			hci_uart_set_flow_control(hu, true);
>  
>  		qca_baudrate = qca_get_baudrate_value(speed);
> @@ -1128,7 +1136,7 @@ static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
>  		host_set_baudrate(hu, speed);
>  
>  error:
> -		if (soc_type == QCA_WCN3990)
> +		if (is_qca_soc_type_wcn399x_family(soc_type))
>  			hci_uart_set_flow_control(hu, false);
>  	}
>  
> @@ -1201,7 +1209,7 @@ static int qca_setup(struct hci_uart *hu)
>  	/* Patch downloading has to be done without IBS mode */
>  	clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
>  
> -	if (soc_type == QCA_WCN3990) {
> +	if (is_qca_soc_type_wcn399x_family(soc_type)) {
>  		bt_dev_info(hdev, "setting up wcn3990");
>  
>  		/* Enable NON_PERSISTENT_SETUP QUIRK to ensure to execute
> @@ -1232,7 +1240,7 @@ static int qca_setup(struct hci_uart *hu)
>  		qca_baudrate = qca_get_baudrate_value(speed);
>  	}
>  
> -	if (soc_type != QCA_WCN3990) {
> +	if (!is_qca_soc_type_wcn399x_family(soc_type)) {
>  		/* Get QCA version information */
>  		ret = qca_read_soc_version(hdev, &soc_ver);
>  		if (ret)
> @@ -1257,7 +1265,7 @@ static int qca_setup(struct hci_uart *hu)
>  	}
>  
>  	/* Setup bdaddr */
> -	if (soc_type == QCA_WCN3990)
> +	if (is_qca_soc_type_wcn399x_family(soc_type))
>  		hu->hdev->set_bdaddr = qca_set_bdaddr;
>  	else
>  		hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
> @@ -1280,7 +1288,7 @@ static int qca_setup(struct hci_uart *hu)
>  	.dequeue	= qca_dequeue,
>  };
>  
> -static const struct qca_vreg_data qca_soc_data = {
> +static const struct qca_vreg_data qca_soc_data_wcn3990 = {
>  	.soc_type = QCA_WCN3990,
>  	.vregs = (struct qca_vreg []) {
>  		{ "vddio",   1800000, 1900000,  15000  },
> @@ -1291,6 +1299,17 @@ static int qca_setup(struct hci_uart *hu)
>  	.num_vregs = 4,
>  };
>  
> +static const struct qca_vreg_data qca_soc_data_wcn3998 = {
> +	.soc_type = QCA_WCN3998,
> +	.vregs = (struct qca_vreg []) {
> +		{ "vddio",   1800000, 1900000,  10000  },
> +		{ "vddxo",   1800000, 1900000,  80000  },
> +		{ "vddrf",   1300000, 1352000,  300000 },
> +		{ "vddch0",  3300000, 3300000,  450000 },
> +	},
> +	.num_vregs = 4,
> +};
> +
>  static void qca_power_shutdown(struct hci_uart *hu)
>  {
>  	struct qca_data *qca = hu->priv;
> @@ -1424,8 +1443,8 @@ static int qca_serdev_probe(struct serdev_device *serdev)
>  	qcadev->serdev_hu.serdev = serdev;
>  	data = of_device_get_match_data(&serdev->dev);
>  	serdev_device_set_drvdata(serdev, qcadev);
> -	if (data && data->soc_type == QCA_WCN3990) {
> -		qcadev->btsoc_type = QCA_WCN3990;
> +	if (data && is_qca_soc_type_wcn399x_family(data->soc_type)) {
> +		qcadev->btsoc_type = data->soc_type;
>  		qcadev->bt_power = devm_kzalloc(&serdev->dev,
>  						sizeof(struct qca_power),
>  						GFP_KERNEL);
> @@ -1489,7 +1508,7 @@ static void qca_serdev_remove(struct serdev_device *serdev)
>  {
>  	struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
>  
> -	if (qcadev->btsoc_type == QCA_WCN3990)
> +	if (qcadev->btsoc_type >= QCA_WCN3990)

use qca_is_wcn399x()

>  		qca_power_shutdown(&qcadev->serdev_hu);
>  	else
>  		clk_disable_unprepare(qcadev->susclk);
> @@ -1499,7 +1518,8 @@ static void qca_serdev_remove(struct serdev_device *serdev)
>  
>  static const struct of_device_id qca_bluetooth_of_match[] = {
>  	{ .compatible = "qcom,qca6174-bt" },
> -	{ .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data},
> +	{ .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
> +	{ .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
>  	{ /* sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);