From 1d4bd0e4ae4ba95892bef919a8d4d3f08f122d7e Mon Sep 17 00:00:00 2001
From: Sherry Sun <sherry.sun@nxp.com>
Date: Fri, 25 Nov 2022 18:19:52 +0800
Subject: [PATCH] tty: serial: fsl_lpuart: disable Rx/Tx DMA in lpuart32_shutdown()
Git-commit: 1d4bd0e4ae4ba95892bef919a8d4d3f08f122d7e
Patch-mainline: v6.3-rc1
References: git-fixes
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@nxp.com>
Link: https://lore.kernel.org/r/20221125101953.18753-3-sherry.sun@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/tty/serial/fsl_lpuart.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1807,6 +1807,11 @@ static void lpuart32_shutdown(struct uar
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 |