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serial: imx: disable UCR4_OREN on shutdown 

UCR4_OREN is (depending on the configuration) enabled in startup,
but is never disabled. Fix this by disabling it in shutdown.

Reported-by: Nandor Han <nandor.han@ge.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Reichel 2018-05-24 19:30:24 +02:00 committed by Greg Kroah-Hartman
parent 0fdf178785
commit 339c7a8757
1 changed files with 5 additions and 1 deletions
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6
drivers/tty/serial/imx.c
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@ -1422,7 +1422,7 @@ static void imx_uart_shutdown(struct uart_port *port)
{
struct imx_port *sport = (struct imx_port *)port;
unsigned long flags;
u32 ucr1, ucr2;
u32 ucr1, ucr2, ucr4;
if (sport->dma_is_enabled) {
dmaengine_terminate_sync(sport->dma_chan_tx);
@ -1452,6 +1452,10 @@ static void imx_uart_shutdown(struct uart_port *port)
ucr2 = imx_uart_readl(sport, UCR2);
ucr2 &= ~(UCR2_TXEN | UCR2_ATEN);
imx_uart_writel(sport, ucr2, UCR2);
ucr4 = imx_uart_readl(sport, UCR4);
ucr4 &= ~UCR4_OREN;
imx_uart_writel(sport, ucr4, UCR4);
spin_unlock_irqrestore(&sport->port.lock, flags);
/*