Commit 019dc9ea authored Aug 24, 2011 by Hui Wang Committed by Greg Kroah-Hartman Aug 24, 2011

serial/imx: support to handle break character



The imx UART hardware controller can identify BREAK character and the
imx_set_termios() can accept BRKINT set by users, but current existing
imx_rxint() can't pass BREAK character and TTY_BREAK to the tty layer
as other serial drivers do (8250.c omap_serial.c).

Here add code to handle BREAK character and pass it to tty layer.

To detect error occurrence, i use URXD_ERR to replace (URXD_OVRRUN |
URXD_FRMERR | ...) because any kind of error occurs, URXD_ERR will
always be set to 1.

I put the URXD_BRK to the first place to check since when BREAK error
occurs, not only URXD_BRK is set to 1, but also URXD_PRERR and
URXD_FRMERR are all set to 1. This arrangement can filter out fake
parity and frame errors when BREAK error occurs.

Signed-off-by: Hui Wang <jason77.wang@gmail.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

parent 9a234349

drivers/tty/serial/imx.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -508,8 +508,10 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
		if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
		continue;

		if (rx & (URXD_PRERR \| URXD_OVRRUN \| URXD_FRMERR) ) {
		if (rx & URXD_PRERR)
		if (unlikely(rx & URXD_ERR)) {
		if (rx & URXD_BRK)
		sport->port.icount.brk++;
		else if (rx & URXD_PRERR)
		sport->port.icount.parity++;
		else if (rx & URXD_FRMERR)
		sport->port.icount.frame++;
		@@ -524,7 +526,9 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)

		rx &= sport->port.read_status_mask;

		if (rx & URXD_PRERR)
		if (rx & URXD_BRK)
		flg = TTY_BREAK;
		else if (rx & URXD_PRERR)
		flg = TTY_PARITY;
		else if (rx & URXD_FRMERR)
		flg = TTY_FRAME;