On 03/07/2014 02:36 PM, Stanislav Meduna wrote:
> On 07.03.2014 09:46, Marc Kleine-Budde wrote:
>
>> Adding the linux-can mailinglist to Cc.
>
> I am not subscribed so maybe that's why the original mail
> did not get through - I did Cc: [email protected]
>
>> Your kernel is missing the patch:
>>
>> e358784 can: flexcan: fix mx28 detection by rearanging OF match table
>>
>> With this patch the CAN core properly detected as an mx28, so that bus
>> errors stay disabled (unless you enable them). If you need bus errors to
>> detect not connected CAN busses, you need another patchset berr_limit,
>> which is not yet mainline. I can repost it here, if you need it.
>
> Ah ok.
>
> Thank you, this probably points me to the right direction - I'll try
> to implement this behaviour in my kernel (unfortunately
> I cannot move to more recent one at the moment).
The following hack should fix the problem:
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index eb4014a..a6be018 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -727,7 +727,16 @@ static int flexcan_chip_start(struct net_device *dev)
reg_ctrl = flexcan_read(®s->ctrl);
reg_ctrl &= ~FLEXCAN_CTRL_TSYN;
reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF |
- FLEXCAN_CTRL_ERR_STATE | FLEXCAN_CTRL_ERR_MSK;
+ FLEXCAN_CTRL_ERR_STATE;
+
+ /*
+ * Quick and dirty hack to enable the "error interrupt"
+ * (FLEXCAN_CTRL_ERR_MSK) for the i.MX8. Warning: this
+ * does not work on most other Flexcan cores. There, we
+ * then don't get any error warning or passive interrupts.
+ */
+ if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
+ reg_ctrl |= FLEXCAN_CTRL_ERR_MSK;
/* save for later use */
priv->reg_ctrl_default = reg_ctrl;
Anyway, you should check if there are other important improvement and
fixes a pending.
Wolfgang.
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