Commit 1d4bd0e4 authored by Sherry Sun's avatar Sherry Sun Committed by Greg Kroah-Hartman
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tty: serial: fsl_lpuart: disable Rx/Tx DMA in lpuart32_shutdown() 



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: 42b68768 ("serial: fsl_lpuart: DMA support for 32-bit variant")
Signed-off-by: default avatarSherry Sun <sherry.sun@nxp.com>
Link: https://lore.kernel.org/r/20221125101953.18753-3-sherry.sun@nxp.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e1d91dda

drivers/tty/serial/fsl_lpuart.c

+5 −0
Original line number Diff line number Diff line
@@ -1799,6 +1799,11 @@ 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 | UARTCTRL_ILIE |