lkml.org 
[lkml]   [2023]   [Jan]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH RESEND] tty: serial: fsl_lpuart: don't enable receiver/transmitter before rx/tx dma ready
Date
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>
---
drivers/tty/serial/fsl_lpuart.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 04fecff2fa5f..eac5243a9db0 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -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);
--
2.17.1
\
 
 \ /
  Last update: 2023-03-27 00:01    [W:0.032 / U:0.260 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site