Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757625Ab3DZUFO (ORCPT ); Fri, 26 Apr 2013 16:05:14 -0400 Received: from bear.ext.ti.com ([192.94.94.41]:37972 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755278Ab3DZUFK (ORCPT ); Fri, 26 Apr 2013 16:05:10 -0400 From: Sourav Poddar To: , , , CC: , , , Sourav Poddar Subject: [PATCHv5 2/2] driver: serial: omap: prevent runtime PM for "no_console_suspend" Date: Sat, 27 Apr 2013 01:34:46 +0530 Message-ID: <1367006686-3720-3-git-send-email-sourav.poddar@ti.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1367006686-3720-1-git-send-email-sourav.poddar@ti.com> References: <1367006686-3720-1-git-send-email-sourav.poddar@ti.com> 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: 2748 Lines: 90 The driver manages "no_console_suspend" by preventing runtime PM during the suspend path, which forces the console UART to stay awake. Signed-off-by: Sourav Poddar Reviewed-by: Felipe Balbi --- drivers/tty/serial/omap-serial.c | 34 +++++++++++++++++++++++++++++++++- 1 files changed, 33 insertions(+), 1 deletions(-) diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index 30d4f7a..9457fe3 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -161,6 +161,7 @@ struct uart_omap_port { u32 calc_latency; struct work_struct qos_work; struct pinctrl *pins; + bool is_suspending; }; #define to_uart_omap_port(p) ((container_of((p), struct uart_omap_port, port))) @@ -1312,6 +1313,22 @@ 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); + + up->is_suspending = true; + + return 0; +} + +static void serial_omap_complete(struct device *dev) +{ + struct uart_omap_port *up = dev_get_drvdata(dev); + + up->is_suspending = false; +} + static int serial_omap_suspend(struct device *dev) { struct uart_omap_port *up = dev_get_drvdata(dev); @@ -1330,7 +1347,10 @@ static int serial_omap_resume(struct device *dev) return 0; } -#endif +#else +#define serial_omap_prepare NULL +#define serial_omap_prepare NULL +#endif /* CONFIG_PM_SLEEP */ static void omap_serial_fill_features_erratas(struct uart_omap_port *up) { @@ -1616,6 +1636,16 @@ static int serial_omap_runtime_suspend(struct device *dev) struct uart_omap_port *up = dev_get_drvdata(dev); struct omap_uart_port_info *pdata = dev->platform_data; + /* + * When using 'no_console_suspend', the console UART must not be + * suspended. Since driver suspend is managed by runtime suspend, + * preventing runtime suspend (by returning error) will keep device + * active during suspend. + */ + if (up->is_suspending && !console_suspend_enabled && + uart_console(&up->port)) + return -EBUSY; + if (!up) return -EINVAL; @@ -1666,6 +1696,8 @@ 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) -- 1.7.1 -- 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/