linux-kernel - [PATCH] can: m_can: Set device to software init mode before closing

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Message-ID: <20200716042312.26989-1-faiz_abbas@ti.com>
Date:   Thu, 16 Jul 2020 09:53:12 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-can@...r.kernel.org>
CC:     <kuba@...nel.org>, <davem@...emloft.net>, <mkl@...gutronix.de>,
        <wg@...ndegger.com>, <sriram.dash@...sung.com>, <dmurphy@...com>,
        <faiz_abbas@...com>
Subject: [PATCH] can: m_can: Set device to software init mode before closing

There might be some requests pending in the buffer when the
interface close sequence occurs. In some devices, these
pending requests might lead to the module not shutting down
properly when m_can_clk_stop() is called.

Therefore, move the device to init state before potentially
powering it down.

Signed-off-by: Faiz Abbas <faiz_abbas@...com>
---
 drivers/net/can/m_can/m_can.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 02c5795b7393..d0c458f7f6e1 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1414,6 +1414,9 @@ static void m_can_stop(struct net_device *dev)
 	/* disable all interrupts */
 	m_can_disable_all_interrupts(cdev);
 
+	/* Set init mode to disengage from the network */
+	m_can_config_endisable(cdev, true);
+
 	/* set the state as STOPPED */
 	cdev->can.state = CAN_STATE_STOPPED;
 }
-- 
2.17.1