linux-kernel - [PATCH 4.7 35/69] net: can: ifi: Configure transmitter delay

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Date:   Wed, 28 Sep 2016 11:05:17 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Marek Vasut <marex@...x.de>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Mark Rutland <mark.rutland@....com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Wolfgang Grandegger <wg@...ndegger.com>
Subject: [PATCH 4.7 35/69] net: can: ifi: Configure transmitter delay

4.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Vasut <marex@...x.de>

commit 8d58790b832e13d6006d842037732304af357c3c upstream.

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@...x.de>
Cc: Marc Kleine-Budde <mkl@...gutronix.de>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Oliver Hartkopp <socketcan@...tkopp.net>
Cc: Wolfgang Grandegger <wg@...ndegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/can/ifi_canfd/ifi_canfd.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- 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(stru
 	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(stru
 	       (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,