On 05/10/2010 04:40 PM, Matthias Fuchs wrote:
> Hi Wolfgang,
>
> On Monday 10 May 2010 15:43, Wolfgang Grandegger wrote:
>> Hi Matthias,
>>
>> On 05/10/2010 03:28 PM, Matthias Fuchs wrote:
>>> This patch adds a driver for esd's USB high speed
>>> CAN interface. The driver supports devices with
>>> multiple CAN interfaces.
>>>
>>> Signed-off-by: Matthias Fuchs <[email protected]>
>>> ---
>>>
>>> version 2:
>>> - use bus-error reporting and counters
>>
>> I don't find support for CAN_CTRLMODE_BERR_REPORTING, apart from setting
>> the flag. If it's set bus error interrupts should be enabled or disabled
>> otherwise.
>>
>> Wolfgang.
> I expect my implementation to be complete.
>
> 1) In esd_usb2_rx_event() I pass tx/rxerr in cf->data[6/7].
> 2) I implemented esd_usb2_get_berr_counter(). This function will
> return the last tx/rx error counters from the hardware that
> are kept in priv->bec.
> 3) tx/rx error counter cannot be requested from the hardware so
> they are stored in priv->bec when they are received from the hardware.
> There is no way to enable or disable this behavior.
> 4) Finally I enabled the whole interface via CAN_CTRLMODE_BERR_REPORTING
> for the CAN framework.
BERR_REPORTING != bus error counter
> I don't see where I missed anything.
The equivalent to the following SJA1000 code is missing:
/* enable interrupts */
if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
priv->write_reg(priv, REG_IER, IRQ_ALL);
else
priv->write_reg(priv, REG_IER, IRQ_ALL & ~IRQ_BEI);
The user must now explicitly enable bus error reporting with
"ip ... type can berr_reporting on ....
Wolfgang.
> Matthias
>
>
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