On 24.02.2021 09:20:04, Vincent Mailhol wrote:
> --- a/include/linux/can/bittiming.h
> +++ b/include/linux/can/bittiming.h
> @@ -1,5 +1,6 @@
> /* SPDX-License-Identifier: GPL-2.0-only */
> /* Copyright (c) 2020 Pengutronix, Marc Kleine-Budde <kernel@xxxxxxxxxxxxxx>
> + * Copyright (c) 2021 Vincent Mailhol <mailhol.vincent@xxxxxxxxxx>
> */
>
> #ifndef _CAN_BITTIMING_H
> @@ -10,6 +11,70 @@
>
> #define CAN_SYNC_SEG 1
>
> +/*
> + * struct can_tdc - CAN FD Transmission Delay Compensation parameters
> + *
> + * At high bit rates, the propagation delay from the TX pin to the RX
> + * pin of the transceiver causes measurement errors: the sample point
> + * on the RX pin might occur on the previous bit.
> + *
> + * To solve this issue, ISO 11898-1 introduces in section 11.3.3
> + * "Transmitter delay compensation" a SSP (Secondary Sample Point)
> + * equal to the distance, in time quanta, from the start of the bit
> + * time on the TX pin to the actual measurement on the RX pin.
> + *
> + * This structure contains the parameters to calculate that SSP.
> + *
> + * @tdcv: Transmitter Delay Compensation Value. Distance, in time
> + * quanta, from when the bit is sent on the TX pin to when it is
> + * received on the RX pin of the transmitter. Possible options:
> + *
> + * O: automatic mode. The controller dynamically measure @tdcv
> + * for each transmited CAN FD frame.
^^^
transmitted
Fixed while applying to linux-can-next/testing. As net-next ist still
closed, there is still some time to the next pull request and I'll
squash patches if needed.
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Embedded Linux | https://www.pengutronix.de |
Vertretung West/Dortmund | Phone: +49-231-2826-924 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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