linux-kernel - AM335x: is AUTORTS mode supported ?

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Message-ID: <51D44B24.3050407@newflow.co.uk>
Date:	Wed, 03 Jul 2013 17:02:44 +0100
From:	Mark Jackson <mpfj-list@...flow.co.uk>
To:	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
CC:	lkml <linux-kernel@...r.kernel.org>, linux-serial@...r.kernel.org,
	gregkh@...uxfoundation.org
Subject: AM335x: is AUTORTS mode supported ?

I'm struggling to determine if AUTORTS mode is currently supported in 3.10 ?

I have dug into the source code, and can see various references to the relevant bits
in the various UART registers, but I'm at a lose as to how to actually *enable* the
mode !!

In drivers/tty/omap-serial.c serial_omap_set_termios() we have:-

	if (termios->c_cflag & CRTSCTS && up->port.flags & UPF_HARD_FLOW) {
		/* Enable AUTORTS and AUTOCTS */
		up->efr |= UART_EFR_CTS | UART_EFR_RTS;

		/* Ensure MCR RTS is asserted */
		up->mcr |= UART_MCR_RTS;
	} else {
		...
	}

So it looks like I need to set the CRTSCTS and UPF_HARD_FLOW flags.

>From userspace, I've tried:-

$ stty -F /dev/ttyO2 crtscts

But I've not idea how to enable UPF_HARD_FLOW !?!

Can anyone point me in the right direction ?

Cheers
Mark J.
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