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tty: serial: fsl_lpuart: set receive watermark for imx8qxp platform

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Since imx8qxp RX FIFO depth is 64 datawords, it will be better to set
the rx watermark as 31, which means when the number of datawords in the
receive FIFO(>= 32) is greater than the watermark, an interrupt or a DMA
request is generated.
Also keep the console rx watermark as 1 to make sure it responsive.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20230130064449.9564-3-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sherry Sun 2023-01-30 14:44:45 +08:00 committed by Greg Kroah-Hartman
parent 34ebb26f12
commit 7c01059017
1 changed files with 5 additions and 1 deletions
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6
drivers/tty/serial/fsl_lpuart.c
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@ -321,7 +321,7 @@ static struct lpuart_soc_data imx8qxp_data = {
.devtype = IMX8QXP_LPUART,
.iotype = UPIO_MEM32,
.reg_off = IMX_REG_OFF,
.rx_watermark = 1,
.rx_watermark = 31,
};
static struct lpuart_soc_data imxrt1050_data = {
.devtype = IMXRT1050_LPUART,
@ -1527,6 +1527,8 @@ static void lpuart_setup_watermark(struct lpuart_port *sport)
writeb(UARTSFIFO_RXUF, sport->port.membase + UARTSFIFO);
}
if (uart_console(&sport->port))
sport->rx_watermark = 1;
writeb(0, sport->port.membase + UARTTWFIFO);
writeb(sport->rx_watermark, sport->port.membase + UARTRWFIFO);
@ -1563,6 +1565,8 @@ static void lpuart32_setup_watermark(struct lpuart_port *sport)
lpuart32_write(&sport->port, val, UARTFIFO);
/* set the watermark */
if (uart_console(&sport->port))
sport->rx_watermark = 1;
val = (sport->rx_watermark << UARTWATER_RXWATER_OFF) |
(0x0 << UARTWATER_TXWATER_OFF);
lpuart32_write(&sport->port, val, UARTWATER);