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authorJeroen Hofstee2019-09-24 18:45:52 +0000
committerMarc Kleine-Budde2019-11-04 21:47:22 +0100
commit59f415c2f5e20a6859e49626e8af4de983ff111c (patch)
tree4a09b0bee2fa45fdaf30c5e020b8641ac65ed9dc /drivers/net/can/ti_hecc.c
parentc4409e9fbea954fdae7927205283dfc3ed8e2d6e (diff)
can: ti_hecc: ti_hecc_stop(): stop the CPK on down
When the interface goes down, the CPK should no longer take an active part in the CAN-bus communication, like sending acks and error frames. So enable configuration mode in ti_hecc_stop, so the CPK is no longer active. When a transceiver switch is present the acks and errors don't make it to the bus, but disabling the CPK then does prevent oddities, like ti_hecc_reset() failing, since the CPK can become bus-off and starts counting the 11 bit recessive bits, which seems to block the reset. It can also cause invalid interrupts and disrupt the CAN-bus, since transmission can be stopped in the middle of a message, by disabling the tranceiver while the CPK is sending. Since the CPK is disabled after normal power on, it is typically only seen when the interface is restarted. Signed-off-by: Jeroen Hofstee <jhofstee@victronenergy.com> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/ti_hecc.c')
-rw-r--r--drivers/net/can/ti_hecc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index 91188e6d4f78..eb8151154083 100644
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -400,6 +400,9 @@ static void ti_hecc_stop(struct net_device *ndev)
{
struct ti_hecc_priv *priv = netdev_priv(ndev);
+ /* Disable the CPK; stop sending, erroring and acking */
+ hecc_set_bit(priv, HECC_CANMC, HECC_CANMC_CCR);
+
/* Disable interrupts and disable mailboxes */
hecc_write(priv, HECC_CANGIM, 0);
hecc_write(priv, HECC_CANMIM, 0);