diff options
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 99dfa884cbef..9db6708e3d9f 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -597,6 +597,19 @@ static void stm32_usart_start_tx(struct uart_port *port) stm32_usart_transmit_chars(port); } +/* Flush the transmit buffer. */ +static void stm32_usart_flush_buffer(struct uart_port *port) +{ + struct stm32_port *stm32_port = to_stm32_port(port); + const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; + + if (stm32_port->tx_ch) { + dmaengine_terminate_async(stm32_port->tx_ch); + stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT); + stm32_port->tx_dma_busy = false; + } +} + /* Throttle the remote when input buffer is about to overflow. */ static void stm32_usart_throttle(struct uart_port *port) { @@ -992,6 +1005,7 @@ static const struct uart_ops stm32_uart_ops = { .break_ctl = stm32_usart_break_ctl, .startup = stm32_usart_startup, .shutdown = stm32_usart_shutdown, + .flush_buffer = stm32_usart_flush_buffer, .set_termios = stm32_usart_set_termios, .pm = stm32_usart_pm, .type = stm32_usart_type, |