[PATCH v15 4/7] Bluetooth: hci_qca: Add wrapper functions for setting UART speed

Balakrishna Godavarthi
2018-08-03T12:17:03Z

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@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.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;
+
+ 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 +993,24 @@ 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 */