On 08/17/2015 11:55 AM, Anirudha Sarangi wrote:

Hi,

quoted

-----Original Message-----
From: Peter Hurley [mailto:peter@hurleysoftware.com]
Sent: Monday, August 17, 2015 9:09 PM
To: Michal Simek
Cc: linux-kernel@vger.kernel.org; monstr@monstr.eu; Anirudha Sarangi; Soren
Brinkmann; Jiri Slaby; linux-serial@vger.kernel.org; Greg Kroah-Hartman; linux-
arm-kernel@lists.infradead.org
Subject: Re: [PATCH 1/4] serial: xuartps: Fix termios issue for enabling odd parity

On 08/17/2015 03:22 AM, Michal Simek wrote:

quoted

From: Anirudha Sarangi <redacted>

Existing set_termios does not handle the option for enabling odd
parity. This patch fixes it.

NAK. PARODD does not enable parity generation or detection.

What if someone is trying to change from even to odd parity?

If userspace wants odd parity, then c_cflag must have both
PARENB and PARODD set.

Just PARODD does nothing.

From SUS v4, General Terminal Interface, 11.2.4 Control Modes;

"If PARENB is set, parity generation and detection shall be enabled
and a parity bit is added to each byte. If parity is enabled, PARODD
shall specify odd parity if set; otherwise, even parity shall be used."

In this conditional case, we setup some register bit for the same.
Is the above use case not a valid one?

Regards
Anirudha

quoted

Regards,
Peter Hurley

quoted

Signed-off-by: Anirudha Sarangi <redacted>
Signed-off-by: Michal Simek <redacted>
---

 drivers/tty/serial/xilinx_uartps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/xilinx_uartps.c

b/drivers/tty/serial/xilinx_uartps.c
index 009e0dbc12d2..a3020344ac9d 100644

--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c

@@ -723,7 +723,7 @@ static void cdns_uart_set_termios(struct uart_port

*port,

quoted

    else
            cval |= CDNS_UART_MR_STOPMODE_1_BIT; /* 1 STOP bit */

-   if (termios->c_cflag & PARENB) {
+   if ((termios->c_cflag & PARENB) || (termios->c_cflag & PARODD)) {
            /* Mark or Space parity */
            if (termios->c_cflag & CMSPAR) {
                    if (termios->c_cflag & PARODD)

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