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authorSascha Hauer <s.hauer@pengutronix.de>2016-09-26 15:55:31 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-27 12:55:27 +0200
commit4b75f80003617fe35771a9e27022e8fbd6a41875 (patch)
tree5dd11667c5a82ee586f2e9d62ffe8daee6bfea7e /drivers/tty/serial
parentb97055bcf17551196a498e624b544c3e9c804ef0 (diff)
serial: imx: Fix DCD reading
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 <s.hauer@pengutronix.de> Fixes: 90ebc4838666 ("serial: imx: repair and complete handshaking") Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: <stable@vger.kernel.org> # 4.5+ Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial')
-rw-r--r--drivers/tty/serial/imx.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index a1d8174a098b..a70356dad1b7 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -763,12 +763,13 @@ 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)