linux-kernel - [PATCHv4 1/4] serial: imx: add a flag to indicate we are in the suspend path

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Date:	Fri, 14 Aug 2015 21:37:45 -0700
From:	Eduardo Valentin <edubezval@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.com>,
	Fabio Estevam <festevam@...il.com>
Cc:	Sascha Hauer <s.hauer@...gutronix.de>,
	Linux PM <linux-pm@...r.kernel.org>,
	linux-serial@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Eduardo Valentin <edubezval@...il.com>
Subject: [PATCHv4 1/4] serial: imx: add a flag to indicate we are in the suspend path

This is a simple flag that gets set across prepare and complete
callbacks in the suspend path. We the flag we may avoid
runtime pm idling at the same time.

Cc: Fabio Estevam <festevam@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Jiri Slaby <jslaby@...e.com>
Cc: linux-serial@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
---
 drivers/tty/serial/imx.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index fe3d41c..50abb60 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -218,6 +218,8 @@ struct imx_port {
 	wait_queue_head_t	dma_wait;
 	unsigned int            saved_reg[10];
 	bool			context_saved;
+
+	bool			is_suspending;
 };
 
 struct imx_port_ucrs {
@@ -2026,6 +2028,22 @@ static void serial_imx_enable_wakeup(struct imx_port *sport, bool on)
 	writel(val, sport->port.membase + UCR1);
 }
 
+static int serial_imx_prepare(struct device *dev)
+{
+	struct imx_port *sport = dev_get_drvdata(dev);
+
+	sport->is_suspending = true;
+
+	return 0;
+}
+
+static void serial_imx_complete(struct device *dev)
+{
+	struct imx_port *sport = dev_get_drvdata(dev);
+
+	sport->is_suspending = false;
+}
+
 static int imx_serial_port_suspend_noirq(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
@@ -2091,6 +2109,8 @@ static const struct dev_pm_ops imx_serial_port_pm_ops = {
 	.resume_noirq = imx_serial_port_resume_noirq,
 	.suspend = imx_serial_port_suspend,
 	.resume = imx_serial_port_resume,
+	.prepare = serial_imx_prepare,
+	.complete = serial_imx_complete,
 };
 
 static struct platform_driver serial_imx_driver = {
-- 
2.5.0

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