netdev - [PATCH 1/2] can: flexcan: disable bus error interrupts for the i.MX6q

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Date:	Wed, 24 Oct 2012 11:06:15 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	David Miller <davem@...emloft.net>
Cc:	Linux Netdev List <netdev@...r.kernel.org>,
	linux-can@...r.kernel.org, Wolfgang Grandegger <wg@...ndegger.com>,
	Hui Wang <jason77.wang@...il.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 1/2] can: flexcan: disable bus error interrupts for the i.MX6q

From: Wolfgang Grandegger <wg@...ndegger.com>

This patch adds some Flexcan version info and removes the feature flag
FLEXCAN_HAS_BROKEN_ERR_STATE for the i.MX6Q. It also has the line [TR]WRN_INT
properly connected.

Cc: Hui Wang <jason77.wang@...il.com>
Cc: Shawn Guo <shawn.guo@...aro.org>
Signed-off-by: Wolfgang Grandegger <wg@...ndegger.com>
[mkl: convert to incremental patch]
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/flexcan.c |   19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index c78ecfc..a412bf6 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -144,9 +144,22 @@
 
 #define FLEXCAN_MB_CODE_MASK		(0xf0ffffff)
 
-/* FLEXCAN hardware feature flags */
+/*
+ * FLEXCAN hardware feature flags
+ *
+ * Below is some version info we got:
+ *    SOC   Version   IP-Version  Glitch-  [TR]WRN_INT
+ *                                Filter?   connected?
+ *   MX25  FlexCAN2  03.00.00.00     no         no
+ *   MX28  FlexCAN2  03.00.04.00    yes        yes
+ *   MX35  FlexCAN2  03.00.00.00     no         no
+ *   MX53  FlexCAN2  03.00.00.00    yes         no
+ *   MX6s  FlexCAN3  10.00.12.00    yes        yes
+ *
+ * Some SOCs do not have the RX_WARN & TX_WARN interrupt line connected.
+ */
 #define FLEXCAN_HAS_V10_FEATURES	BIT(1) /* For core version >= 10 */
-#define FLEXCAN_HAS_BROKEN_ERR_STATE	BIT(2) /* Broken error state handling */
+#define FLEXCAN_HAS_BROKEN_ERR_STATE	BIT(2) /* [TR]WRN_INT not connected */
 
 /* Structure of the message buffer */
 struct flexcan_mb {
@@ -205,7 +218,7 @@ static struct flexcan_devtype_data fsl_p1010_devtype_data = {
 };
 static struct flexcan_devtype_data fsl_imx28_devtype_data;
 static struct flexcan_devtype_data fsl_imx6q_devtype_data = {
-	.features = FLEXCAN_HAS_V10_FEATURES | FLEXCAN_HAS_BROKEN_ERR_STATE,
+	.features = FLEXCAN_HAS_V10_FEATURES,
 };
 
 static const struct can_bittiming_const flexcan_bittiming_const = {
-- 
1.7.10

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