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| author |   Sascha Hauer <s.hauer@pengutronix.de> | 2019-06-14 09:23:49 +0200 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2019-07-06 12:53:56 +0200 |
| commit | 40fbb915fd0f4b088f5c9b07061b7d665287d26f (patch) | |
| tree | 765fb7b8865ae2ecadc9df3c2676ba42374f25e5 /drivers/bluetooth | |
| parent | 6lowpan: no need to check return value of debugfs_create functions (diff) | |
| download | linux-dev-40fbb915fd0f4b088f5c9b07061b7d665287d26f.tar.xz linux-dev-40fbb915fd0f4b088f5c9b07061b7d665287d26f.zip | |
Bluetooth: hci_ldisc: Add function to wait for characters to be sent
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>
Diffstat (limited to 'drivers/bluetooth')
| -rw-r--r-- | drivers/bluetooth/hci_ldisc.c | 8 | ||||
| -rw-r--r-- | drivers/bluetooth/hci_uart.h | 1 |
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index c84f985f348d..8950e07889fe 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -178,6 +178,7 @@ restart: 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) diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h index d8cf005e3c5d..f11af3912ce6 100644 --- a/drivers/bluetooth/hci_uart.h +++ b/drivers/bluetooth/hci_uart.h @@ -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); |