Commit dc7e3ef7 authored by Paul Mundt's avatar Paul Mundt
Browse files

serial: sh-sci: Add support for loopback mode. 



This plugs in loopback control for SCFCR-enabled ports and plugs it in
via the TIOCM_LOOP control, as others do.

Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent cdf7c42f

drivers/tty/serial/sh-sci.c

+14 −1
Original line number Diff line number Diff line
@@ -1113,10 +1113,23 @@ static unsigned int sci_tx_empty(struct uart_port *port) 
 * handled via the ->init_pins() op, which is a bit of a one-way street,

 * lacking any ability to defer pin control -- this will later be

 * converted over to the GPIO framework).

 *

 * Other modes (such as loopback) are supported generically on certain

 * port types, but not others. For these it's sufficient to test for the

 * existence of the support register and simply ignore the port type.

 */

static void sci_set_mctrl(struct uart_port *port, unsigned int mctrl)

{

	/* Nothing to do here. */

	if (mctrl & TIOCM_LOOP) {

		struct plat_sci_reg *reg;



		/*

		 * Standard loopback mode for SCFCR ports.

		 */

		reg = sci_getreg(port, SCFCR);

		if (reg->size)

			sci_out(port, SCFCR, sci_in(port, SCFCR) | 1);

	}

}



static unsigned int sci_get_mctrl(struct uart_port *port)