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authorRoman Fietze <roman.fietze@telemotive.de>2018-07-11 15:36:14 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-28 07:55:45 +0200
commit08382d3a1be25a41d9d82b8bba9a26c9b2b22cf3 (patch)
treec8d8c66cc5844bd4dc029815d86366c245fa7577
parenta55d3d73d45787b091b1fadf1b1c0c23613860c1 (diff)
can: m_can.c: fix setup of CCCR register: clear CCCR NISO bit before checking can.ctrlmode
commit 393753b217f05474e714aea36c37501546ed1202 upstream. Inside m_can_chip_config(), when setting up the new value of the CCCR, the CCCR_NISO bit is not cleared like the others, CCCR_TEST, CCCR_MON, CCCR_BRSE and CCCR_FDOE, before checking the can.ctrlmode bits for CAN_CTRLMODE_FD_NON_ISO. This way once the controller was configured for CAN_CTRLMODE_FD_NON_ISO, this mode could never be cleared again. This fix is only relevant for controllers with version 3.1.x or 3.2.x. Older versions do not support NISO. Signed-off-by: Roman Fietze <roman.fietze@telemotive.de> Cc: linux-stable <stable@vger.kernel.org> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/can/m_can/m_can.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index 5d4e61741476..ca3fa82316c2 100644
--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -1073,7 +1073,8 @@ static void m_can_chip_config(struct net_device *dev)
} else {
/* Version 3.1.x or 3.2.x */
- cccr &= ~(CCCR_TEST | CCCR_MON | CCCR_BRSE | CCCR_FDOE);
+ cccr &= ~(CCCR_TEST | CCCR_MON | CCCR_BRSE | CCCR_FDOE |
+ CCCR_NISO);
/* Only 3.2.x has NISO Bit implemented */
if (priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO)