can: c_can: Set reserved bit in IFx_MASK2 to 1 on write

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

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 58607f1..2282b1a 100644 (file)
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -488,8 +488,12 @@ static void c_can_setup_receive_object(struct net_device *dev, int iface,
 
        priv->write_reg(priv, C_CAN_IFACE(MASK1_REG, iface),
                        IFX_WRITE_LOW_16BIT(mask));
+
+       /* According to C_CAN documentation, the reserved bit
+        * in IFx_MASK2 register is fixed 1
+        */
        priv->write_reg(priv, C_CAN_IFACE(MASK2_REG, iface),
-                       IFX_WRITE_HIGH_16BIT(mask));
+                       IFX_WRITE_HIGH_16BIT(mask) | BIT(13));
 
        priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
                        IFX_WRITE_LOW_16BIT(id));