linux-kernel - [PATCH tty-next v2 1/4] serial: cpm_uart: No LF conversion in put_poll

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Date:	Thu, 29 May 2014 09:48:43 +0100
From:	Daniel Thompson <daniel.thompson@...aro.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Daniel Thompson <daniel.thompson@...aro.org>,
	linux-serial@...r.kernel.org, patches@...aro.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	John Stultz <john.stultz@...aro.org>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Colin Cross <ccross@...roid.com>, kernel-team@...roid.com,
	Jason Wessel <jason.wessel@...driver.com>,
	kgdb-bugreport@...ts.sourceforge.net, Jiri Slaby <jslaby@...e.cz>,
	Dirk Behme <dirk.behme@...bosch.com>,
	Doug Anderson <dianders@...omium.org>,
	Christophe Leroy <christophe.leroy@....fr>
Subject: [PATCH tty-next v2 1/4] serial: cpm_uart: No LF conversion in put_poll_char()

In (c7d44a02a serial_core: Commonalize crlf when working w/ a non open
console port) the core was modified to make the UART poll_put_char()
automatically convert LF to CRLF. This driver's poll_put_char() adds a
CR itself and this was not disabled by the above patch meaning
currently it sends two CR characters.

The code to issue a character is shared by the console write code (where
driver must do LF to CRLF conversion, although it can make use of the
uart_console_write() helper function) and the poll_put_char (where
driver must not do the conversion). For that reason we add a flag rather
than simply rip out the conversion code.

Signed-off-by: Daniel Thompson <daniel.thompson@...aro.org>
Cc: Doug Anderson <dianders@...omium.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.cz>
Cc: Christophe Leroy <christophe.leroy@....fr>
Cc: linux-serial@...r.kernel.org
---
 drivers/tty/serial/cpm_uart/cpm_uart_core.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index 7d76214..aa60e6d 100644
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -971,7 +971,7 @@ static void cpm_uart_config_port(struct uart_port *port, int flags)
  * Note that this is called with interrupts already disabled
  */
 static void cpm_uart_early_write(struct uart_cpm_port *pinfo,
-		const char *string, u_int count)
+		const char *string, u_int count, bool handle_linefeed)
 {
 	unsigned int i;
 	cbd_t __iomem *bdp, *bdbase;
@@ -1013,7 +1013,7 @@ static void cpm_uart_early_write(struct uart_cpm_port *pinfo,
 			bdp++;
 
 		/* if a LF, also do CR... */
-		if (*string == 10) {
+		if (handle_linefeed && *string == 10) {
 			while ((in_be16(&bdp->cbd_sc) & BD_SC_READY) != 0)
 				;
 
@@ -1111,7 +1111,7 @@ static void cpm_put_poll_char(struct uart_port *port,
 	static char ch[2];
 
 	ch[0] = (char)c;
-	cpm_uart_early_write(pinfo, ch, 1);
+	cpm_uart_early_write(pinfo, ch, 1, false);
 }
 #endif /* CONFIG_CONSOLE_POLL */
 
@@ -1275,7 +1275,7 @@ static void cpm_uart_console_write(struct console *co, const char *s,
 		spin_lock_irqsave(&pinfo->port.lock, flags);
 	}
 
-	cpm_uart_early_write(pinfo, s, count);
+	cpm_uart_early_write(pinfo, s, count, true);
 
 	if (unlikely(nolock)) {
 		local_irq_restore(flags);
-- 
1.9.0

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