diff options
| author | Peng Fan <[email protected]> | 2020-09-29 17:55:09 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2020-09-30 14:29:36 +0200 |
| commit | 29788ab1d2bf26c130de8f44f9553ee78a27e8d5 (patch) | |
| tree | 82797543f21cfe9e2c780aa5411789088dfd64da | |
| parent | 9ea40db477c024dcb87321b7f32bd6ea12130ac2 (diff) | |
tty: serial: fsl_lpuart: fix lpuart32_poll_get_char
The watermark is set to 1, so we need to input two chars to trigger RDRF
using the original logic. With the new logic, we could always get the
char when there is data in FIFO.
Suggested-by: Fugang Duan <[email protected]>
Signed-off-by: Peng Fan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 645bbb24b433..590c901a1fc5 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -680,7 +680,7 @@ static void lpuart32_poll_put_char(struct uart_port *port, unsigned char c) static int lpuart32_poll_get_char(struct uart_port *port) { - if (!(lpuart32_read(port, UARTSTAT) & UARTSTAT_RDRF)) + if (!(lpuart32_read(port, UARTWATER) >> UARTWATER_RXCNT_OFF)) return NO_POLL_CHAR; return lpuart32_read(port, UARTDATA); |