netdev - [net 15/15] can: m_can: m_can_stop(): set device to software init mode before closing

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Message-Id: <20201115174131.2089251-16-mkl@pengutronix.de>
Date:   Sun, 15 Nov 2020 18:41:31 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Faiz Abbas <faiz_abbas@...com>,
        Dan Murphy <dmurphy@...com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [net 15/15] can: m_can: m_can_stop(): set device to software init mode before closing

From: Faiz Abbas <faiz_abbas@...com>

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.

Fixes: e0d1f4816f2a ("can: m_can: add Bosch M_CAN controller support")
Signed-off-by: Faiz Abbas <faiz_abbas@...com>
Acked-by: Dan Murphy <dmurphy@...com>
Link: https://lore.kernel.org/r/20200825055442.16994-1-faiz_abbas@ti.com
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 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 645101d19989..e7264043f79a 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;
 }
-- 
2.29.2