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can: flexcan: handle state passive -> warning transition

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Once the CAN-bus is open and a packet is sent, the controller switches
into the PASSIVE state. Once the BUS is closed again it goes the back
err-warning. The TX error counter goes 0 -> 0x80 -> 0x7f.
This patch makes sure that the user learns about this state chang
(CAN_STATE_ERROR_WARNING => CAN_STATE_ERROR_PASSIVE)

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Matthias Klein <matthias.klein@optimeas.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Sebastian Andrzej Siewior 2014-07-25 20:16:40 +02:00 committed by Marc Kleine-Budde
parent bc03a54139
commit 8ce261d0bb
1 changed files with 7 additions and 0 deletions
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7
drivers/net/can/flexcan.c
View file

@ -549,6 +549,13 @@ static void do_state(struct net_device *dev,
/* process state changes depending on the new state */
switch (new_state) {
case CAN_STATE_ERROR_WARNING:
netdev_dbg(dev, "Error Warning\n");
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = (bec.txerr > bec.rxerr) ?
CAN_ERR_CRTL_TX_WARNING :
CAN_ERR_CRTL_RX_WARNING;
break;
case CAN_STATE_ERROR_ACTIVE:
netdev_dbg(dev, "Error Active\n");
cf->can_id |= CAN_ERR_PROT;