linux-kernel - [PATCH V2] tty: serial: fsl_lpuart: correct the count of break characters

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Message-Id: <20220725050115.12396-1-sherry.sun@nxp.com>
Date:   Mon, 25 Jul 2022 13:01:15 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org, michael@...le.cc
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx@....com
Subject: [PATCH V2] tty: serial: fsl_lpuart: correct the count of break characters

The LPUART can't distinguish between a break signal and a framing error,
so need to count the break characters if there is a framing error and
received data is zero instead of the parity error.

Fixes: 5541a9bacfe5 ("serial: fsl_lpuart: handle break and make sysrq work")
Signed-off-by: Sherry Sun <sherry.sun@....com>
Reviewed-by: Michael Walle <michael@...le.cc>
---
Changes in V2:
1. Take this fix patch out of the previous patch set separately.
2. Add the Reviewed-by tag.
---
 drivers/tty/serial/fsl_lpuart.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 1c3c6844fa36..8a4aae7dbd99 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -990,12 +990,12 @@ static void lpuart32_rxint(struct lpuart_port *sport)
 
 		if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) {
 			if (sr & UARTSTAT_PE) {
+				sport->port.icount.parity++;
+			} else if (sr & UARTSTAT_FE) {
 				if (is_break)
 					sport->port.icount.brk++;
 				else
-					sport->port.icount.parity++;
-			} else if (sr & UARTSTAT_FE) {
-				sport->port.icount.frame++;
+					sport->port.icount.frame++;
 			}
 
 			if (sr & UARTSTAT_OR)
@@ -1010,12 +1010,12 @@ static void lpuart32_rxint(struct lpuart_port *sport)
 			sr &= sport->port.read_status_mask;
 
 			if (sr & UARTSTAT_PE) {
+				flg = TTY_PARITY;
+			} else if (sr & UARTSTAT_FE) {
 				if (is_break)
 					flg = TTY_BREAK;
 				else
-					flg = TTY_PARITY;
-			} else if (sr & UARTSTAT_FE) {
-				flg = TTY_FRAME;
+					flg = TTY_FRAME;
 			}
 
 			if (sr & UARTSTAT_OR)
-- 
2.17.1