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Bluetooth: hci_ldisc: Add function to wait for characters to be sent

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The hci UART line discipline sends its characters in a workqueue. Some
devices like the Marvell Bluetooth chips need to make sure that all
queued characters are sent before switching the baudrate. This adds
a function to synchronize with the workqueue.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Sascha Hauer 2019-06-14 09:23:49 +02:00 committed by Marcel Holtmann
parent db50450d09
commit 40fbb915fd
2 changed files with 9 additions and 0 deletions
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8
drivers/bluetooth/hci_ldisc.c
View File

@ -178,6 +178,7 @@ static void hci_uart_write_work(struct work_struct *work)
goto restart;
clear_bit(HCI_UART_SENDING, &hu->tx_state);
wake_up_bit(&hu->tx_state, HCI_UART_SENDING);
}
void hci_uart_init_work(struct work_struct *work)
@ -213,6 +214,13 @@ int hci_uart_init_ready(struct hci_uart *hu)
return 0;
}
int hci_uart_wait_until_sent(struct hci_uart *hu)
{
return wait_on_bit_timeout(&hu->tx_state, HCI_UART_SENDING,
TASK_INTERRUPTIBLE,
msecs_to_jiffies(2000));
}
/* ------- Interface to HCI layer ------ */
/* Reset device */
static int hci_uart_flush(struct hci_dev *hdev)

1
drivers/bluetooth/hci_uart.h
View File

@ -100,6 +100,7 @@ int hci_uart_register_device(struct hci_uart *hu, const struct hci_uart_proto *p
void hci_uart_unregister_device(struct hci_uart *hu);
int hci_uart_tx_wakeup(struct hci_uart *hu);
int hci_uart_wait_until_sent(struct hci_uart *hu);
int hci_uart_init_ready(struct hci_uart *hu);
void hci_uart_init_work(struct work_struct *work);
void hci_uart_set_baudrate(struct hci_uart *hu, unsigned int speed);