On Fri, Feb 26, 2021 at 02:39:36PM +0100, Marc Kleine-Budde wrote: > > Am I correct in saying that rx-offload requires RX timestamps to be > > available? > > Proper timestamps for RX and TX would be best, but you can use > can_rx_offload_queue_tail() if you don't have any timestamps. > > > They can be enabled in M_CAN, but the v3.3 manual states that > > the internal timestamp generation (apparently only option for tcan4x5x) > > cannot be used for CAN-FD. > > Can you give me a reference to this? Here's the manual for 3.3 (annoyingly, I can't find corresponding documents for earlier M_CAN versions, and TCAN4550 uses 3.2...) http://www.bosch-semiconductors.com/media/ip_modules/pdf_2/m_can/mcan_users_manual_v330.pdf See Section 2.3.9, "Timestamp Counter Configuration (TSCC)". Quote: Note: With CAN FD an external counter is required for timestamp generation (TSS = “10”) -- Regards, Torin Cooper-Bennun Software Engineer | maxiluxsystems.com
