linux-kernel - [PATCH 4.14 244/496] can: m_can: select pinctrl state in each suspend/resume function

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Date:   Mon, 28 May 2018 12:00:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bich Hemon <bich.hemon@...com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 244/496] can: m_can: select pinctrl state in each suspend/resume function

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bich HEMON <bich.hemon@...com>

[ Upstream commit c9b3bce18da4a0aebc27853052dea39aa64b7d75 ]

Make sure to apply the correct pin state in suspend/resume callbacks.
Putting pins in sleep state saves power.

Signed-off-by: Bich Hemon <bich.hemon@...com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/can/m_can/m_can.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -25,6 +25,7 @@
 #include <linux/platform_device.h>
 #include <linux/iopoll.h>
 #include <linux/can/dev.h>
+#include <linux/pinctrl/consumer.h>
 
 /* napi related */
 #define M_CAN_NAPI_WEIGHT	64
@@ -1682,6 +1683,8 @@ static __maybe_unused int m_can_suspend(
 		m_can_clk_stop(priv);
 	}
 
+	pinctrl_pm_select_sleep_state(dev);
+
 	priv->can.state = CAN_STATE_SLEEPING;
 
 	return 0;
@@ -1692,6 +1695,8 @@ static __maybe_unused int m_can_resume(s
 	struct net_device *ndev = dev_get_drvdata(dev);
 	struct m_can_priv *priv = netdev_priv(ndev);
 
+	pinctrl_pm_select_default_state(dev);
+
 	m_can_init_ram(priv);
 
 	priv->can.state = CAN_STATE_ERROR_ACTIVE;