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tty: serial: fsl_lpuart: don't enable receiver/transmitter before rx/tx dma ready

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lpuart32_setup_watermark_enable() will configure the UART FIFO and
watermark, also enable the receiver and transmitter, this should be done
after the rx/tx dma steup ready.

Also add lpuart32_hw_disable() to make sure the receiver/transmitter and
interrupts are disabled during the dma steup.

Signed-off-by: Sherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20230130054107.9119-1-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sherry Sun 2023-01-30 13:41:07 +08:00 committed by Greg Kroah-Hartman
parent ed0400ad54
commit 8a79052c32
1 changed files with 12 additions and 1 deletions
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13
drivers/tty/serial/fsl_lpuart.c
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@ -1702,6 +1702,16 @@ static int lpuart_startup(struct uart_port *port)
return 0;
}
static void lpuart32_hw_disable(struct lpuart_port *sport)
{
unsigned long temp;
temp = lpuart32_read(&sport->port, UARTCTRL);
temp &= ~(UARTCTRL_RIE | UARTCTRL_ILIE | UARTCTRL_RE |
UARTCTRL_TIE | UARTCTRL_TE);
lpuart32_write(&sport->port, temp, UARTCTRL);
}
static void lpuart32_configure(struct lpuart_port *sport)
{
unsigned long temp;
@ -1726,11 +1736,12 @@ static void lpuart32_hw_setup(struct lpuart_port *sport)
spin_lock_irqsave(&sport->port.lock, flags);
lpuart32_setup_watermark_enable(sport);
lpuart32_hw_disable(sport);
lpuart_rx_dma_startup(sport);
lpuart_tx_dma_startup(sport);
lpuart32_setup_watermark_enable(sport);
lpuart32_configure(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);