From: Eric Nelson <eric.nelson@boundarydevices.com>
Date: Thu, 18 Dec 2014 19:37:13 +0000 (-0700)
Subject: serial: imx: preserve characters with parity or framing errors
X-Git-Tag: firefly_0821_release~176^2~2319^2~75
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8d267fd98b7706a6296409b69bf2cca42087a9ef;p=firefly-linux-kernel-4.4.55.git

serial: imx: preserve characters with parity or framing errors

If IGNPAR/INPCK are clear in termios->c_iflag,  characters
received with parity or framing errors should be preserved
and passed to the upper layers of the tty stack.

Specifically, the decision of whether to set the character
value to zero should be made by n_tty.c/n_tty_receive_parity_error().

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 72b800b296b1..6ac22d75a4bb 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -733,7 +733,7 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 				continue;
 			}
 
-			rx &= sport->port.read_status_mask;
+			rx &= (sport->port.read_status_mask | 0xFF);
 
 			if (rx & URXD_BRK)
 				flg = TTY_BREAK;