Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755996AbbHQQY2 (ORCPT ); Mon, 17 Aug 2015 12:24:28 -0400 Received: from mail-qg0-f50.google.com ([209.85.192.50]:36445 "EHLO mail-qg0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755627AbbHQQYZ (ORCPT ); Mon, 17 Aug 2015 12:24:25 -0400 Message-ID: <55D20AB4.4030405@hurleysoftware.com> Date: Mon, 17 Aug 2015 12:24:20 -0400 From: Peter Hurley User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.8.0 MIME-Version: 1.0 To: Anirudha Sarangi , Michal Simek CC: "linux-kernel@vger.kernel.org" , "monstr@monstr.eu" , 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 References: <5b154ba97bcd79e49e2131152eb2fc1761594a6c.1439796149.git.michal.simek@xilinx.com> <55D20017.4010008@hurleysoftware.com> <59506B47DEDD3943ABF9AC60020F4E2978D6E7EA@XAP-PVEXMBX02.xlnx.xilinx.com> In-Reply-To: <59506B47DEDD3943ABF9AC60020F4E2978D6E7EA@XAP-PVEXMBX02.xlnx.xilinx.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2909 Lines: 78 On 08/17/2015 11:55 AM, Anirudha Sarangi wrote: > Hi, > >> -----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: >>> From: Anirudha Sarangi >>> >>> 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 > >> Regards, >> Peter Hurley >> >>> Signed-off-by: Anirudha Sarangi >>> Signed-off-by: Michal Simek >>> --- >>> >>> 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, >>> 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) >>> > > > > This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/