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From 74d7e639cce7ae95cacd948dcf5ed3b28c3fff5c Mon Sep 17 00:00:00 2001
From: Fugang Duan <fugang.duan@nxp.com>
Date: Mon, 28 Jan 2019 10:27:27 +0800
Subject: [PATCH] tty: serial: fsl_lpuart: add magic SysRq support
Add magic SysRq key support.
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
---
drivers/tty/serial/fsl_lpuart.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -931,7 +931,12 @@ static void lpuart32_rxint(struct lpuart
*/
sr = lpuart32_read(&sport->port, UARTSTAT);
rx = lpuart32_read(&sport->port, UARTDATA);
- rx &= 0x3ff;
+
+ if ((sr & UARTSTAT_FE) && (rx & UARTDATA_FRETSC) &&
+ !(rx & UARTDATA_MASK)) {
+ if (uart_handle_break(&sport->port))
+ continue;
+ }
if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
continue;
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