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net: can: ifi: Configure transmitter delay 

Configure the transmitter delay register at +0x1c to correctly handle
the CAN FD bitrate switch (BRS). This moves the SSP (secondary sample
point) to a proper offset, so that the TDC mechanism works and won't
generate error frames on the CAN link.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Oliver Hartkopp <socketcan@hartkopp.net>
Cc: Wolfgang Grandegger <wg@grandegger.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marek Vasut 2016-09-19 21:34:01 +02:00 committed by Marc Kleine-Budde
parent b5036cd4ed
commit 8d58790b83
1 changed files with 10 additions and 1 deletions
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11
drivers/net/can/ifi_canfd/ifi_canfd.c
View File

@ -81,6 +81,10 @@
#define IFI_CANFD_TIME_SET_TIMEA_4_12_6_6 BIT(15)
#define IFI_CANFD_TDELAY 0x1c
#define IFI_CANFD_TDELAY_DEFAULT 0xb
#define IFI_CANFD_TDELAY_MASK 0x3fff
#define IFI_CANFD_TDELAY_ABS BIT(14)
#define IFI_CANFD_TDELAY_EN BIT(15)
#define IFI_CANFD_ERROR 0x20
#define IFI_CANFD_ERROR_TX_OFFSET 0
@ -641,7 +645,7 @@ static void ifi_canfd_set_bittiming(struct net_device *ndev)
struct ifi_canfd_priv *priv = netdev_priv(ndev);
const struct can_bittiming *bt = &priv->can.bittiming;
const struct can_bittiming *dbt = &priv->can.data_bittiming;
u16 brp, sjw, tseg1, tseg2;
u16 brp, sjw, tseg1, tseg2, tdc;
/* Configure bit timing */
brp = bt->brp - 2;
@ -664,6 +668,11 @@ static void ifi_canfd_set_bittiming(struct net_device *ndev)
(brp << IFI_CANFD_TIME_PRESCALE_OFF) |
(sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
priv->base + IFI_CANFD_FTIME);
/* Configure transmitter delay */
tdc = (dbt->brp * (dbt->phase_seg1 + 1)) & IFI_CANFD_TDELAY_MASK;
writel(IFI_CANFD_TDELAY_EN | IFI_CANFD_TDELAY_ABS | tdc,
priv->base + IFI_CANFD_TDELAY);
}
static void ifi_canfd_set_filter(struct net_device *ndev, const u32 id,