can: c_can: Simplify buffer reenabling

Instead of writing to the message object we can simply clear the
NewDat bit with the get method.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-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 6170e64..2aae073 100644 (file)
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -108,6 +108,7 @@
 #define IF_COMM_CONTROL                BIT(4)
 #define IF_COMM_CLR_INT_PND    BIT(3)
 #define IF_COMM_TXRQST         BIT(2)
+#define IF_COMM_CLR_NEWDAT     IF_COMM_TXRQST
 #define IF_COMM_DATAA          BIT(1)
 #define IF_COMM_DATAB          BIT(0)
 #define IF_COMM_ALL            (IF_COMM_MASK | IF_COMM_ARB | \
@@ -120,7 +121,7 @@
                                 IF_COMM_DATAA | IF_COMM_DATAB)
 
 /* For the high buffers we clear the interrupt bit and newdat */
-#define IF_COMM_RCV_HIGH       (IF_COMM_RCV_LOW | IF_COMM_TXRQST)
+#define IF_COMM_RCV_HIGH       (IF_COMM_RCV_LOW | IF_COMM_CLR_NEWDAT)
 
 /* IFx arbitration */
 #define IF_ARB_MSGVAL          BIT(15)
@@ -353,17 +354,12 @@ static void c_can_write_msg_object(struct net_device *dev,
 }
 
 static inline void c_can_activate_all_lower_rx_msg_obj(struct net_device *dev,
-                                               int iface,
-                                               int ctrl_mask)
+                                                      int iface)
 {
        int i;
-       struct c_can_priv *priv = netdev_priv(dev);
 
-       for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_MSG_RX_LOW_LAST; i++) {
-               priv->write_reg(priv, C_CAN_IFACE(MSGCTRL_REG, iface),
-                               ctrl_mask & ~IF_MCONT_NEWDAT);
-               c_can_object_put(dev, iface, i, IF_COMM_CONTROL);
-       }
+       for (i = C_CAN_MSG_OBJ_RX_FIRST; i <= C_CAN_MSG_RX_LOW_LAST; i++)
+               c_can_object_get(dev, iface, i, IF_COMM_CLR_NEWDAT);
 }
 
 static int c_can_handle_lost_msg_obj(struct net_device *dev,
@@ -829,7 +825,7 @@ static int c_can_read_objects(struct net_device *dev, struct c_can_priv *priv,
 
                if (obj == C_CAN_MSG_RX_LOW_LAST)
                        /* activate all lower message objects */
-                       c_can_activate_all_lower_rx_msg_obj(dev, IF_RX, ctrl);
+                       c_can_activate_all_lower_rx_msg_obj(dev, IF_RX);
 
                pkts++;
                quota--;