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| author | Sergey Organov <sorganov@gmail.com> | 2019-07-26 21:52:39 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-04 12:43:46 +0200 |
| commit | a25aee902e666e8cc41e33754f13c69a979dd67f (patch) | |
| tree | 14c9e0ed6c3b1bd9973d43c5494530987515368b /drivers/tty/serial/imx.c | |
| parent | 72d819612ae0b080ba141a6959cea138ddc1e330 (diff) | |
| download | linux-a25aee902e666e8cc41e33754f13c69a979dd67f.tar.gz | |
serial: imx: set_termios(): do not enable autoRTS if RTS is unset
Don't let receiver hardware automatically control RTS output if it
was requested to be inactive.
To ensure this, set_termios() shouldn't set UCR2_CTSC bit if UCR2_CTS
(=TIOCM_RTS) is cleared. Added corresponding check in imx_uart_rts_auto()
to fix this.
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Sergey Organov <sorganov@gmail.com>
Link: https://lore.kernel.org/r/1564167161-3972-2-git-send-email-sorganov@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/imx.c')
| -rw-r--r-- | drivers/tty/serial/imx.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 57d6e6ba556e..32f36d86a960 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -405,7 +405,12 @@ static void imx_uart_rts_inactive(struct imx_port *sport, u32 *ucr2) /* called with port.lock taken and irqs caller dependent */ static void imx_uart_rts_auto(struct imx_port *sport, u32 *ucr2) { - *ucr2 |= UCR2_CTSC; + /* + * Only let receiver control RTS output if we were not requested to have + * RTS inactive (which then should take precedence). + */ + if (*ucr2 & UCR2_CTS) + *ucr2 |= UCR2_CTSC; } /* called with port.lock taken and irqs off */ |