linux-kernel - Re: [PATCH v2 1/1] can: ucan: add driver for Theobroma Systems UCAN devices

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Date:   Wed, 14 Mar 2018 10:14:25 +0100
From:   Jakob Unterwurzacher <jakob.unterwurzacher@...obroma-systems.com>
To:     Wolfgang Grandegger <wg@...ndegger.com>
Cc:     Martin Elshuber <martin.elshuber@...obroma-systems.com>,
        Philipp Tomsich <philipp.tomsich@...obroma-systems.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        linux-can@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] can: ucan: add driver for Theobroma Systems UCAN
 devices

On 14.03.18 10:11, Wolfgang Grandegger wrote:
>> +    /* handle error frames */
>> +    canid = le32_to_cpu(m->msg.can_msg.id);
>> +    if (canid & CAN_ERR_FLAG) {
>> +        ucan_handle_error_frame(up, m, canid);
>> +        /* drop frame if berr-reporting is off */
>> +        if (!(up->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING))
>> +            return;
>> +    }
> 
> You still do not generate error messages for state changes, IIUC.

The hardware generates error frames on state changes - is that what you 
mean?

In our testing, the state shows up (and updates) correctly in

	ip -details -statistics link show can0

Best regards,
Jakob