diff options
| author | Sherry Sun <sherry.sun@nxp.com> | 2023-01-30 14:44:48 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-31 10:53:39 +0100 |
| commit | ecba98f9ddf426af337fb8b63d7581c254fe6e87 (patch) | |
| tree | 24f67b87cab8a2bc7dcae3a6b993c14b35dc7e95 /drivers/tty/serial/fsl_lpuart.c | |
| parent | 96f54fd4894711b0dce6a1c8c26c882295dc9234 (diff) | |
tty: serial: fsl_lpuart: set RTS watermark for lpuart
Add RTS watermark support for LPUART. The RX RTS_B output negates when
the number of empty words in the receive FIFO is greater or equal to
RTSWATER. Here set the RTSWATER to half of the rxfifo_size.
Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20230130064449.9564-6-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/fsl_lpuart.c')
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 2789749d3d0d..c35e49a09bcc 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -201,6 +201,7 @@ #define UARTDATA_MASK 0x3ff #define UARTMODIR_IREN 0x00020000 +#define UARTMODIR_RTSWATER GENMASK(10, 8) #define UARTMODIR_TXCTSSRC 0x00000020 #define UARTMODIR_TXCTSC 0x00000010 #define UARTMODIR_RXRTSE 0x00000008 @@ -1573,6 +1574,13 @@ static void lpuart32_setup_watermark(struct lpuart_port *sport) (0x0 << UARTWATER_TXWATER_OFF); lpuart32_write(&sport->port, val, UARTWATER); + /* set RTS watermark */ + if (!uart_console(&sport->port)) { + val = lpuart32_read(&sport->port, UARTMODIR); + val |= FIELD_PREP(UARTMODIR_RTSWATER, sport->rxfifo_size >> 1); + lpuart32_write(&sport->port, val, UARTMODIR); + } + /* Restore cr2 */ lpuart32_write(&sport->port, ctrl_saved, UARTCTRL); } |