The USR2_DCDIN bit is tested for in register usr1. As the name suggests the usr2 register should be used instead. This fixes reading the Carrier detect status.
Signed-off-by: Sascha Hauer <[email protected]> --- drivers/tty/serial/imx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 0df2b1c..615c027 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -740,12 +740,13 @@ static unsigned int imx_get_hwmctrl(struct imx_port *sport) { unsigned int tmp = TIOCM_DSR; unsigned usr1 = readl(sport->port.membase + USR1); + unsigned usr2 = readl(sport->port.membase + USR2); if (usr1 & USR1_RTSS) tmp |= TIOCM_CTS; /* in DCE mode DCDIN is always 0 */ - if (!(usr1 & USR2_DCDIN)) + if (!(usr2 & USR2_DCDIN)) tmp |= TIOCM_CAR; if (sport->dte_mode) -- 2.9.3
