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serial: imx: Enable RTSD only when needed 

Currently, this IRQ is always enabled. Some devices might mux these pins
to other I/Os, like I2C. This could lead to spurious interrupts.

This commit makes this IRQ optional, by using the field have_rtscts.

Signed-off-by: Nandor Han <nandor.han@ge.com>
Signed-off-by: Romain Perier <romain.perier@collabora.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nandor Han 2017-06-28 15:59:36 +02:00 committed by Greg Kroah-Hartman
parent 5ac88295fc
commit 6376cd39ea
1 changed files with 3 additions and 1 deletions
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4
drivers/tty/serial/imx.c
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@ -1299,7 +1299,9 @@ static int imx_startup(struct uart_port *port)
imx_enable_dma(sport);
temp = readl(sport->port.membase + UCR1);
temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN;
temp |= UCR1_RRDYEN | UCR1_UARTEN;
if (sport->have_rtscts)
temp |= UCR1_RTSDEN;
writel(temp, sport->port.membase + UCR1);