linux-kernel - [PATCH 28/81] can: c_can: Set reserved bit in IFx

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Date:	Tue, 19 Feb 2013 15:48:51 -0300
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Alexander Stein <alexander.stein@...tec-electronic.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 28/81] can: c_can: Set reserved bit in IFx_MASK2 to 1 on write

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

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

From: Alexander Stein <alexander.stein@...tec-electronic.com>

commit 2bd3bc4e8472424f1a6009825397639a8968920a upstream.

According to C_CAN documentation, the reserved bit in IFx_MASK2 register is
fixed 1.

Signed-off-by: Alexander Stein <alexander.stein@...tec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
[ herton: adjust context ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 drivers/net/can/c_can/c_can.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 21a3d77..64647d4 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -446,8 +446,12 @@ static void c_can_setup_receive_object(struct net_device *dev, int iface,
 
 	priv->write_reg(priv, &priv->regs->ifregs[iface].mask1,
 			IFX_WRITE_LOW_16BIT(mask));
+
+	/* According to C_CAN documentation, the reserved bit
+	 * in IFx_MASK2 register is fixed 1
+	 */
 	priv->write_reg(priv, &priv->regs->ifregs[iface].mask2,
-			IFX_WRITE_HIGH_16BIT(mask));
+			IFX_WRITE_HIGH_16BIT(mask) | BIT(13));
 
 	priv->write_reg(priv, &priv->regs->ifregs[iface].arb1,
 			IFX_WRITE_LOW_16BIT(id));
-- 
1.7.9.5

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