linux-kernel - [PATCH v9 4/7] Bluetooth: hci_qca: Add wrapper functions for setting UART speed

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Message-Id: <20180705165515.13340-5-bgodavar@codeaurora.org>
Date:   Thu,  5 Jul 2018 22:25:12 +0530
From:   Balakrishna Godavarthi <bgodavar@...eaurora.org>
To:     marcel@...tmann.org, johan.hedberg@...il.com, mka@...omium.org
Cc:     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,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>
Subject: [PATCH v9 4/7] Bluetooth: hci_qca: Add wrapper functions for setting UART speed

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>
---
Changes in v9:
    * added corner case to fail driver if speeds are missing.

Changes in v8:
    * common function to set INIT and operating speeds.

Changes in v7:
    * initial patch
    * created wrapper functions for init and operating speeds.
---
 drivers/bluetooth/hci_qca.c | 94 ++++++++++++++++++++++++++++---------
 1 file changed, 71 insertions(+), 23 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index c02e1d465cca..9106547324fa 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 +928,62 @@ 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)
+{
+	/* 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;
+
+	return 0;
+}
+
+static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
+{
+	unsigned int speed, qca_baudrate;
+	int ret;
+
+	if (speed_type == QCA_INIT_SPEED) {
+		speed = qca_get_speed(hu, QCA_INIT_SPEED);
+		if (speed)
+			host_set_baudrate(hu, speed);
+	} else {
+		speed = qca_get_speed(hu, QCA_OPER_SPEED);
+		if (!speed)
+			return 0;
+
+		qca_baudrate = qca_get_baudrate_value(speed);
+		bt_dev_info(hu->hdev, "Set UART speed to %d", speed);
+		ret = qca_set_baudrate(hu->hdev, qca_baudrate);
+		if (ret)
+			return ret;
+
+		host_set_baudrate(hu, speed);
+	}
+
+	return 0;
+}
+
 static int qca_setup(struct hci_uart *hu)
 {
 	struct hci_dev *hdev = hu->hdev;
@@ -933,37 +994,24 @@ static int qca_setup(struct hci_uart *hu)
 
 	bt_dev_info(hdev, "ROME setup");
 
+	ret = qca_check_speeds(hu);
+	if (ret)
+		return ret;
+
 	/* Patch downloading has to be done without IBS mode */
 	clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
 
 	/* Setup initial baudrate */
-	speed = 0;
-	if (hu->init_speed)
-		speed = hu->init_speed;
-	else if (hu->proto->init_speed)
-		speed = hu->proto->init_speed;
-
-	if (speed)
-		host_set_baudrate(hu, speed);
+	qca_set_speed(hu, QCA_INIT_SPEED);
 
 	/* Setup user speed if needed */
-	speed = 0;
-	if (hu->oper_speed)
-		speed = hu->oper_speed;
-	else if (hu->proto->oper_speed)
-		speed = hu->proto->oper_speed;
-
+	speed = qca_get_speed(hu, QCA_OPER_SPEED);
 	if (speed) {
-		qca_baudrate = qca_get_baudrate_value(speed);
-
-		bt_dev_info(hdev, "Set UART speed to %d", speed);
-		ret = qca_set_baudrate(hdev, qca_baudrate);
-		if (ret) {
-			bt_dev_err(hdev, "Failed to change the baud rate (%d)",
-				   ret);
+		ret = qca_set_speed(hu, QCA_OPER_SPEED);
+		if (ret)
 			return ret;
-		}
-		host_set_baudrate(hu, speed);
+
+		qca_baudrate = qca_get_baudrate_value(speed);
 	}
 
 	/* Get QCA version information */
-- 
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