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authorPeter Hurley <peter@hurleysoftware.com>2015-01-25 14:44:52 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-02-02 10:11:28 -0800
commit9719acce37803d179fc94884c8d50b883fc8186e (patch)
tree6733045f07039bd64f197917505aaef6b1b827f6 /drivers/tty
parent391f93f2ec9f857c83bdd21a14dcf7e699f38579 (diff)
serial: 8250_omap: Use UPSTAT_AUTORTS for RTS handling
Commit 88838d3112702 ("serial: omap_8250: Fix RTS handling") fixed RTS pin control when in autoRTS mode. New support added in "serial: core: Rework hw-assisted flow control support" enables a much simpler approach; rather than masking out autoRTS whenever writing the EFR register, use the UPSTAT_* mode to determine if autoRTS should be enabled when raising RTS (in omap8250_set_mctrl()). Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/serial/8250/8250_omap.c16
1 files changed, 7 insertions, 9 deletions
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index 6e4ff7148ead..fe6d2e51da09 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -120,10 +120,11 @@ static void omap8250_set_mctrl(struct uart_port *port, unsigned int mctrl)
*/
lcr = serial_in(up, UART_LCR);
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
- if (mctrl & TIOCM_RTS)
- serial_out(up, UART_EFR, priv->efr);
+ if ((mctrl & TIOCM_RTS) && (port->status & UPSTAT_AUTORTS))
+ priv->efr |= UART_EFR_RTS;
else
- serial_out(up, UART_EFR, priv->efr & ~UART_EFR_RTS);
+ priv->efr &= ~UART_EFR_RTS;
+ serial_out(up, UART_EFR, priv->efr);
serial_out(up, UART_LCR, lcr);
}
@@ -272,10 +273,7 @@ static void omap8250_restore_regs(struct uart_8250_port *up)
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
serial_dl_write(up, priv->quot);
- if (up->port.mctrl & TIOCM_RTS)
- serial_out(up, UART_EFR, priv->efr);
- else
- serial_out(up, UART_EFR, priv->efr & ~UART_EFR_RTS);
+ serial_out(up, UART_EFR, priv->efr);
/* Configure flow control */
serial_out(up, UART_LCR, UART_LCR_CONF_MODE_B);
@@ -424,9 +422,9 @@ static void omap_8250_set_termios(struct uart_port *port,
up->port.status &= ~(UPSTAT_AUTOCTS | UPSTAT_AUTORTS | UPSTAT_AUTOXOFF);
if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
- /* Enable AUTORTS and AUTOCTS */
+ /* Enable AUTOCTS (autoRTS is enabled when RTS is raised) */
up->port.status |= UPSTAT_AUTOCTS | UPSTAT_AUTORTS;
- priv->efr |= UART_EFR_CTS | UART_EFR_RTS;
+ priv->efr |= UART_EFR_CTS;
} else if (up->port.flags & UPF_SOFT_FLOW) {
/*
* IXON Flag: