diff options
Diffstat (limited to 'drivers/tty/serial/fsl_lpuart.c')
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 238998620349..5e13946edc3b 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -664,8 +664,18 @@ static unsigned int lpuart_tx_empty(struct uart_port *port) static unsigned int lpuart32_tx_empty(struct uart_port *port) { - return (lpuart32_read(port, UARTSTAT) & UARTSTAT_TC) ? - TIOCSER_TEMT : 0; + struct lpuart_port *sport = container_of(port, + struct lpuart_port, port); + unsigned long stat = lpuart32_read(port, UARTSTAT); + unsigned long sfifo = lpuart32_read(port, UARTFIFO); + + if (sport->dma_tx_in_progress) + return 0; + + if (stat & UARTSTAT_TC && sfifo & UARTFIFO_TXEMPT) + return TIOCSER_TEMT; + + return 0; } static bool lpuart_is_32(struct lpuart_port *sport) |