diff options
| author | Fabio Estevam <fabio.estevam@nxp.com> | 2017-01-30 12:12:12 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-01-31 10:54:58 +0100 |
| commit | bc2be239feef9ac9fc8ad17adf7c03b353f6546f (patch) | |
| tree | 1c4e2caac30b566fa6498500909cb2ea148717ba /drivers | |
| parent | serial: imx: Fix the RTS GPIO polarity in RS485 mode (diff) | |
| download | linux-bc2be239feef9ac9fc8ad17adf7c03b353f6546f.tar.xz linux-bc2be239feef9ac9fc8ad17adf7c03b353f6546f.zip | |
serial: imx: Fix the CTS_B polarity in RS485 mode
When userspace passes the SER_RS485_RTS_ON_SEND flag it means that the
CTS_B pin should go to logic level high before the transmission begins.
CTS_B goes to logic level high when both CTSC and CTS bits are cleared.
When userspace passes the SER_RS485_RTS_AFTER_SEND flag it means that the
CTS_B pin should go to logic level low after the transmission finishes.
CTS_B goes to logic level low when CTSC bit is cleared and CTS bit is set.
So fix the CTS_B polarity logic.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/imx.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 29dd57c51706..e3e152cbc75e 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -336,15 +336,15 @@ static void imx_port_ucrs_restore(struct uart_port *port, static void imx_port_rts_active(struct imx_port *sport, unsigned long *ucr2) { - *ucr2 &= ~UCR2_CTSC; - *ucr2 |= UCR2_CTS; + *ucr2 &= ~(UCR2_CTSC | UCR2_CTS); mctrl_gpio_set(sport->gpios, sport->port.mctrl | TIOCM_RTS); } static void imx_port_rts_inactive(struct imx_port *sport, unsigned long *ucr2) { - *ucr2 &= ~(UCR2_CTSC | UCR2_CTS); + *ucr2 &= ~UCR2_CTSC; + *ucr2 |= UCR2_CTS; mctrl_gpio_set(sport->gpios, sport->port.mctrl & ~TIOCM_RTS); } |