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serial: 8250_omap: Use UPSTAT_AUTORTS for RTS handling

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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>
This commit is contained in:
Peter Hurley 2015-01-25 14:44:52 -05:00 committed by Greg Kroah-Hartman
parent 391f93f2ec
commit 9719acce37
1 changed files with 7 additions and 9 deletions
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16
drivers/tty/serial/8250/8250_omap.c
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@ -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: