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serial: sh-sci: Avoid FIFO clear for MCE toggle.

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When toggling the MCE support we don't want to concern ourselves with the
FIFO state, so ensure that the clearing bits are masked out when updating
the MCE state.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2011-12-02 19:02:06 +09:00
parent faf02f8fee
commit 73c3d53f38
1 changed files with 13 additions and 6 deletions
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19
drivers/tty/serial/sh-sci.c
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@ -1771,18 +1771,25 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios,
sci_init_pins(port, termios->c_cflag);
if (s->cfg->capabilities & SCIx_HAVE_RTSCTS) {
reg = sci_getreg(port, SCFCR);
if (reg->size) {
unsigned short ctrl;
reg = sci_getreg(port, SCFCR);
if (reg->size) {
unsigned short ctrl = sci_in(port, SCFCR);
ctrl = sci_in(port, SCFCR);
if (s->cfg->capabilities & SCIx_HAVE_RTSCTS) {
if (termios->c_cflag & CRTSCTS)
ctrl |= SCFCR_MCE;
else
ctrl &= ~SCFCR_MCE;
sci_out(port, SCFCR, ctrl);
}
/*
* As we've done a sci_reset() above, ensure we don't
* interfere with the FIFOs while toggling MCE. As the
* reset values could still be set, simply mask them out.
*/
ctrl &= ~(SCFCR_RFRST | SCFCR_TFRST);
sci_out(port, SCFCR, ctrl);
}
sci_out(port, SCSCR, s->cfg->scscr);