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can-calc-bit-timing: document kernel commit of current bit timing calculation algorithm

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Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde
2022-01-19 07:21:38 +01:00
parent 8d01589500
commit f9c9f6841b
1 changed files with 15 additions and 1 deletions
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can-calc-bit-timing.c
+15 -1
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@@ -585,6 +585,17 @@ static const unsigned int common_data_bitrates[] = {
* registers of the CAN controller. You can find more information
* in the header file linux/can/netlink.h.
*/
/*
* imported from v4.8-rc1~140^2~304^2~11
*
* 7da29f97d6c8 can: dev: can-calc-bit-timing(): better sample point calculation
*/
#undef can_update_spt
#undef can_calc_bittiming
#define can_update_spt can_update_spt_v4_8
#define can_calc_bittiming can_calc_bittiming_v4_8
static int can_update_spt(const struct can_bittiming_const *btc,
unsigned int spt_nominal, unsigned int tseg,
unsigned int *tseg1_ptr, unsigned int *tseg2_ptr,
@@ -729,6 +740,9 @@ static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt,
return 0;
}
#undef can_calc_bittiming
#undef can_update_spt
static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt,
const struct can_bittiming_const *btc)
{
@@ -822,7 +836,7 @@ static void print_bittiming_one(const struct can_bittiming_const *bittiming_cons
return;
}
} else {
if (can_calc_bittiming(&dev, &bt, bittiming_const)) {
if (can_calc_bittiming_v4_8(&dev, &bt, bittiming_const)) {
printf("%8d ***bitrate not possible***\n", bitrate_nominal);
return;
}