From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754745AbZISVn3 (ORCPT ); Sat, 19 Sep 2009 17:43:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754702AbZISVnS (ORCPT ); Sat, 19 Sep 2009 17:43:18 -0400 Received: from kroah.org ([198.145.64.141]:40521 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754669AbZISVnP (ORCPT ); Sat, 19 Sep 2009 17:43:15 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Deepak Saxena , Alan Cox , Greg Kroah-Hartman Subject: [PATCH 57/79] Set proper console speed on resume if console suspend is disabled Date: Sat, 19 Sep 2009 14:37:02 -0700 Message-Id: <1253396244-7885-57-git-send-email-gregkh@suse.de> X-Mailer: git-send-email 1.6.4.2 In-Reply-To: <20090919213345.GB7668@kroah.com> References: <20090919213345.GB7668@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Deepak Saxena Commit b5b82df6, from May 2007, breaks no_console_suspend on the OLPC XO laptop. Basically what happens is that upon returning from resume, serial8250_resume_port() will reconfigure the port for high speed mode and all console output will be garbled, making debug of the resume path painful. This patch modifies uart_resume_port() to reset the port to the state it was in before we suspended. Original patch by Marcelo Tosatti Second patch by Deepak then reworked by Alan to fit with the tty changes before it got submitted. Also fixed the console path to set c_i/ospeed as some drivers require the termios fields are valid Signed-off-by: Deepak Saxena Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/serial/serial_core.c | 32 ++++++++++++++++++-------------- 1 files changed, 18 insertions(+), 14 deletions(-) diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c index 3fd0134..2514d00 100644 --- a/drivers/serial/serial_core.c +++ b/drivers/serial/serial_core.c @@ -2068,11 +2068,29 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) struct tty_port *port = &state->port; struct device *tty_dev; struct uart_match match = {uport, drv}; + struct ktermios termios; mutex_lock(&port->mutex); if (!console_suspend_enabled && uart_console(uport)) { /* no need to resume serial console, it wasn't suspended */ + /* + * First try to use the console cflag setting. + */ + memset(&termios, 0, sizeof(struct ktermios)); + termios.c_cflag = uport->cons->cflag; + /* + * If that's unset, use the tty termios setting. + */ + if (termios.c_cflag == 0) + termios = *state->port.tty->termios; + else { + termios.c_ispeed = termios.c_ospeed = + tty_termios_input_baud_rate(&termios); + termios.c_ispeed = termios.c_ospeed = + tty_termios_baud_rate(&termios); + } + uport->ops->set_termios(uport, &termios, NULL); mutex_unlock(&port->mutex); return 0; } @@ -2089,20 +2107,6 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport) * Re-enable the console device after suspending. */ if (uart_console(uport)) { - struct ktermios termios; - - /* - * First try to use the console cflag setting. - */ - memset(&termios, 0, sizeof(struct ktermios)); - termios.c_cflag = uport->cons->cflag; - - /* - * If that's unset, use the tty termios setting. - */ - if (port->tty && termios.c_cflag == 0) - termios = *port->tty->termios; - uart_change_pm(state, 0); uport->ops->set_termios(uport, &termios, NULL); console_start(uport->cons); -- 1.6.4.2