serial: sh-sci: Correct pin initialization on (H)SCIF

Correct pin initialization on (H)SCIF:
  - RTS must be deasserted (it's active low),
  - SCK must be an input, as it may be used as the optional external
    clock input.

Initial pin configuration must always be done:
  - Regardless of the presence of dedicated RTS and CTS pins: if the
    register exists, the RTS/CTS bits exist, too,
  - Regardless of hardware flow control being enabled or not: RTS must
    be deasserted.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index ce7bd16..c46999f 100644 (file)
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -712,21 +712,14 @@ static void sci_init_pins(struct uart_port *port, unsigned int cflag)
                return;
        }
 
-       /*
-        * For the generic path SCSPTR is necessary. Bail out if that's
-        * unavailable, too.
-        */
-       if (!sci_getreg(port, SCSPTR)->size)
-               return;
-
-       if ((s->cfg->capabilities & SCIx_HAVE_RTSCTS) &&
-           ((!(cflag & CRTSCTS)))) {
-               unsigned short status;
-
-               status = serial_port_in(port, SCSPTR);
-               status &= ~SCSPTR_CTSIO;
-               status |= SCSPTR_RTSIO;
-               serial_port_out(port, SCSPTR, status); /* Set RTS = 1 */
+       if (sci_getreg(port, SCSPTR)->size) {
+               u16 status = serial_port_in(port, SCSPTR);
+
+               /* RTS# is output, driven 1 */
+               status |= SCSPTR_RTSIO | SCSPTR_RTSDT;
+               /* CTS# and SCK are inputs */
+               status &= ~(SCSPTR_CTSIO | SCSPTR_SCKIO);
+               serial_port_out(port, SCSPTR, status);
        }
 }