On 02/20/2017 11:04 AM, Yegor Yefremov wrote:

quoted

Does the ti_hecc core have a RX timestamp per mailbox? Then you can make
use of the rx_offload helper.

Yes, it does. See Section "23.10.2.2 Message Object Time Stamp
Registers (CANMOTS)". What drivers use such a feature? Only PEAK so
far?

        /* convert timestamp into kernel time */
        peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
        hwts = skb_hwtstamps(skb);
        hwts->hwtstamp = timeval_to_ktime(tv);

Why should this help to resolve freezing issue?

David Jander and me created the rx-offload helper, which abstracts the
reading of the mailboxes for controllers with real fifos or mailboxes
which are filled in a particular order. The timestamp of the mailbox is
used to sort the CAN frames into chronological order.

The flexcan driver has been ported to that helper, see:

30164759db1b can: flexcan: make use of rx-offload's irq_offload_fifo
b3cf53e988ce can: flexcan: add support for timestamp based rx-offload

Marc

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