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authorJeroen Hofstee <jhofstee@victronenergy.com>2019-10-02 00:01:24 +0300
committerMarc Kleine-Budde <mkl@pengutronix.de>2019-11-04 23:47:21 +0300
commit6f12001ad5e79d0a0b08c599731d45c34cafd376 (patch)
tree7c523a66dec1d3e0fa3ae7e1fd8e202c745c4c63 /drivers/net/can/c_can
parent23c5a9488f076bab336177cd1d1a366bd8ddf087 (diff)
downloadlinux-6f12001ad5e79d0a0b08c599731d45c34cafd376.tar.xz
can: c_can: C_CAN: add bus recovery events
While the state is updated when the error counters increase and decrease, there is no event when the bus recovers and the error counters decrease again. So add that event as well. Change the state going downward to be ERROR_PASSIVE -> ERROR_WARNING -> ERROR_ACTIVE instead of directly to ERROR_ACTIVE again. Signed-off-by: Jeroen Hofstee <jhofstee@victronenergy.com> Acked-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> Tested-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can/c_can')
-rw-r--r--drivers/net/can/c_can/c_can.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 24c6015f6c92..8e9f5620c9a2 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -915,6 +915,9 @@ static int c_can_handle_state_change(struct net_device *dev,
struct can_berr_counter bec;
switch (error_type) {
+ case C_CAN_NO_ERROR:
+ priv->can.state = CAN_STATE_ERROR_ACTIVE;
+ break;
case C_CAN_ERROR_WARNING:
/* error warning state */
priv->can.can_stats.error_warning++;
@@ -945,6 +948,13 @@ static int c_can_handle_state_change(struct net_device *dev,
ERR_CNT_RP_SHIFT;
switch (error_type) {
+ case C_CAN_NO_ERROR:
+ /* error warning state */
+ cf->can_id |= CAN_ERR_CRTL;
+ cf->data[1] = CAN_ERR_CRTL_ACTIVE;
+ cf->data[6] = bec.txerr;
+ cf->data[7] = bec.rxerr;
+ break;
case C_CAN_ERROR_WARNING:
/* error warning state */
cf->can_id |= CAN_ERR_CRTL;
@@ -1089,11 +1099,17 @@ static int c_can_poll(struct napi_struct *napi, int quota)
/* handle bus recovery events */
if ((!(curr & STATUS_BOFF)) && (last & STATUS_BOFF)) {
netdev_dbg(dev, "left bus off state\n");
- priv->can.state = CAN_STATE_ERROR_ACTIVE;
+ work_done += c_can_handle_state_change(dev, C_CAN_ERROR_PASSIVE);
}
+
if ((!(curr & STATUS_EPASS)) && (last & STATUS_EPASS)) {
netdev_dbg(dev, "left error passive state\n");
- priv->can.state = CAN_STATE_ERROR_ACTIVE;
+ work_done += c_can_handle_state_change(dev, C_CAN_ERROR_WARNING);
+ }
+
+ if ((!(curr & STATUS_EWARN)) && (last & STATUS_EWARN)) {
+ netdev_dbg(dev, "left error warning state\n");
+ work_done += c_can_handle_state_change(dev, C_CAN_NO_ERROR);
}
/* handle lec errors on the bus */