From: Sherry Sun Date: Fri, 25 Nov 2022 10:19:52 +0000 (+0800) Subject: tty: serial: fsl_lpuart: disable Rx/Tx DMA in lpuart32_shutdown() X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=dc8ca4fb36af6b10c28c22581ae6a9172681a284;p=users%2Fjedix%2Flinux-maple.git tty: serial: fsl_lpuart: disable Rx/Tx DMA in lpuart32_shutdown() [ 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 Link: https://lore.kernel.org/r/20221125101953.18753-3-sherry.sun@nxp.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 888e01fbd9c5..262b059e3ee1 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 |