Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752413Ab3DRR5E (ORCPT ); Thu, 18 Apr 2013 13:57:04 -0400 Received: from mail-pd0-f182.google.com ([209.85.192.182]:64002 "EHLO mail-pd0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751742Ab3DRR5B (ORCPT ); Thu, 18 Apr 2013 13:57:01 -0400 From: Kevin Hilman To: Sourav Poddar Cc: , , , , , Subject: Re: [PATCH 3/6] driver: serial: omap: add prepare/complete callback for "no_console_suspend" case References: <1366198467-6757-1-git-send-email-sourav.poddar@ti.com> <1366198467-6757-4-git-send-email-sourav.poddar@ti.com> Date: Thu, 18 Apr 2013 10:56:58 -0700 In-Reply-To: <1366198467-6757-4-git-send-email-sourav.poddar@ti.com> (Sourav Poddar's message of "Wed, 17 Apr 2013 17:04:24 +0530") Message-ID: <874nf367th.fsf@linaro.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2698 Lines: 77 Sourav Poddar writes: > The patch adapt the serial core/driver to take care of the case when "no_console_suspend" > is used in the bootargs. The patch will remove dependency to set od->flags to > "OMAP_DEVICE_NO_IDLE_ON_SUSPEND" in serial.c(non dt case) and omap_device.c(dt case). > > Prepare and complete callbacks will ensure that clocks remain active for the console > uart when "no_console_suspend" is used in the bootargs. > > Signed-off-by: Sourav Poddar This changelog needs a rework. The driver itself was not aware of od->flags and omap_device stuff in general, so it's not really relevant. The driver is also not directly managing clocks, int's only doing runtime PM callbacks. What you want to say in the changelog is that the driver manages "no_console_suspend" by preventing runtime PM during the suspend path, which forces the console UART to stay awake. > --- > drivers/tty/serial/omap-serial.c | 20 ++++++++++++++++++++ > 1 files changed, 20 insertions(+), 0 deletions(-) > > diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c > index 08332f3..9ef80cf 100644 > --- a/drivers/tty/serial/omap-serial.c > +++ b/drivers/tty/serial/omap-serial.c > @@ -1278,6 +1278,24 @@ static struct uart_driver serial_omap_reg = { > }; > > #ifdef CONFIG_PM_SLEEP > +static int serial_omap_prepare(struct device *dev) > +{ > + struct uart_omap_port *up = dev_get_drvdata(dev); > + > + if (!console_suspend_enabled && uart_console(&up->port)) > + pm_runtime_disable(dev); > + > + return 0; > +} > + > +static void serial_omap_complete(struct device *dev) > +{ > + struct uart_omap_port *up = dev_get_drvdata(dev); > + > + if (!console_suspend_enabled && uart_console(&up->port)) > + pm_runtime_enable(dev); > +} > + For compilation with !CONFIG_PM_SLEEP, you'll also need: #else #define serial_omap_prepare NULL #define serial_omap_prepare NULL #endif /* CONFIG_PM_SLEEP */ > static int serial_omap_suspend(struct device *dev) > { > struct uart_omap_port *up = dev_get_drvdata(dev); > @@ -1632,6 +1650,8 @@ static const struct dev_pm_ops serial_omap_dev_pm_ops = { > SET_SYSTEM_SLEEP_PM_OPS(serial_omap_suspend, serial_omap_resume) > SET_RUNTIME_PM_OPS(serial_omap_runtime_suspend, > serial_omap_runtime_resume, NULL) > + .prepare = serial_omap_prepare, > + .complete = serial_omap_complete, > }; > > #if defined(CONFIG_OF) Kevin -- 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/