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authorMarek Vasut <marex@denx.de>2016-09-19 21:34:01 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2016-09-21 10:32:24 +0200
commit8d58790b832e13d6006d842037732304af357c3c (patch)
tree959472dcb010b91b1c72accdfdfbe7ace34fb379 /drivers
parentb5036cd4ed3173ab8cdbc85e2ba74acf46bafb51 (diff)
downloadlinux-stericsson-8d58790b832e13d6006d842037732304af357c3c.tar.gz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/can/ifi_canfd/ifi_canfd.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/net/can/ifi_canfd/ifi_canfd.c b/drivers/net/can/ifi_canfd/ifi_canfd.c
index 2d1d22eec750..368bb0710d8f 100644
--- a/drivers/net/can/ifi_canfd/ifi_canfd.c
+++ b/drivers/net/can/ifi_canfd/ifi_canfd.c
@@ -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,