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tty: serial: fsl_lpuart: set RTS watermark for lpuart

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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>
This commit is contained in:
Sherry Sun 2023-01-30 14:44:48 +08:00 committed by Greg Kroah-Hartman
parent 96f54fd489
commit ecba98f9dd
1 changed files with 8 additions and 0 deletions
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8
drivers/tty/serial/fsl_lpuart.c
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@ -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);
}