From: Sherry Sun <sherry.sun@xxxxxxx>
[ Upstream commit 1d4bd0e4ae4ba95892bef919a8d4d3f08f122d7e ]
UARTBAUD_RDMAE and UARTBAUD_TDMAE are enabled in lpuart32_startup(), but
lpuart32_shutdown() not disable them, only free the dma ring buffer and
release the dma channels, so here disable the Rx/Tx DMA first in
lpuart32_shutdown().
Fixes: 42b68768e51b ("serial: fsl_lpuart: DMA support for 32-bit variant")
Signed-off-by: Sherry Sun <sherry.sun@xxxxxxx>
Link: https://lore.kernel.org/r/20221125101953.18753-3-sherry.sun@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/tty/serial/fsl_lpuart.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 888e01fbd9c5f..262b059e3ee11 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1791,6 +1791,11 @@ static void lpuart32_shutdown(struct uart_port *port)
spin_lock_irqsave(&port->lock, flags);
+ /* disable Rx/Tx DMA */
+ temp = lpuart32_read(port, UARTBAUD);
+ temp &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE);
+ lpuart32_write(port, temp, UARTBAUD);
+
/* disable Rx/Tx and interrupts */
temp = lpuart32_read(port, UARTCTRL);
temp &= ~(UARTCTRL_TE | UARTCTRL_RE |
--
2.39.2
