diff options
| author | Jeroen Hofstee <jhofstee@victronenergy.com> | 2019-09-24 18:45:52 +0000 |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2019-11-04 21:47:22 +0100 |
| commit | 59f415c2f5e20a6859e49626e8af4de983ff111c (patch) | |
| tree | 4a09b0bee2fa45fdaf30c5e020b8641ac65ed9dc | |
| parent | c4409e9fbea954fdae7927205283dfc3ed8e2d6e (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So enable configuration mode in ti_hecc_stop, so the CPK is no longer
active.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>
| -rw-r--r-- | drivers/net/can/ti_hecc.c | 3 |
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); |