diff options
| author | Marc Kleine-Budde | 2023-02-01 17:18:56 +0100 |
|---|---|---|
| committer | Marc Kleine-Budde | 2023-02-06 13:57:25 +0100 |
| commit | 52375446f2b52cfafa1804fc11570c992b894d94 (patch) | |
| tree | 66caab2d72855bbd898d2392af3e05a2f542bf25 | |
| parent | 9cf670dbe69d11c6f29284aa80d78741f038ecd4 (diff) | |
can: bittiming: can_fixup_bittiming(): set effective tq
The can_fixup_bittiming() function is used to validate the
user-supplied low-level bit timing parameters and calculate the
bitrate prescaler (brp) from the requested time quanta (tq) and the
CAN clock of the controller.
can_fixup_bittiming() selects the best matching integer bit rate
prescaler, which may result in a different time quantum than the value
specified by the user.
Calculate the resulting time quantum and assign it so that the user
sees the effective time quantum.
Link: https://lore.kernel.org/all/20230202110854.2318594-4-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
| -rw-r--r-- | drivers/net/can/dev/bittiming.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/can/dev/bittiming.c b/drivers/net/can/dev/bittiming.c index 5e111dbbe090..e4917c2f34d3 100644 --- a/drivers/net/can/dev/bittiming.c +++ b/drivers/net/can/dev/bittiming.c @@ -40,6 +40,8 @@ static int can_fixup_bittiming(const struct net_device *dev, struct can_bittimin bt->bitrate = priv->clock.freq / (bt->brp * can_bit_time(bt)); bt->sample_point = ((CAN_SYNC_SEG + tseg1) * 1000) / can_bit_time(bt); + bt->tq = DIV_U64_ROUND_CLOSEST(mul_u32_u32(bt->brp, NSEC_PER_SEC), + priv->clock.freq); return 0; } |