can: ti_hecc: release the mailbox a bit earlier

Release the mailbox after reading it, so it can be reused a bit earlier.
Since "can: rx-offload: continue on error" all pending message bits are
cleared directly, so remove clearing them in ti_hecc.
Suggested-by: NMarc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: NJeroen Hofstee <jhofstee@victronenergy.com>
Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/ti_hecc.c

@@ -530,8 +530,9 @@ static unsigned int ti_hecc_mailbox_read(struct can_rx_offload *offload,
 					 u32 *timestamp, unsigned int mbxno)
 {
 	struct ti_hecc_priv *priv = rx_offload_to_priv(offload);
-	u32 data;
+	u32 data, mbx_mask;
 
+	mbx_mask = BIT(mbxno);
 	data = hecc_read_mbx(priv, mbxno, HECC_CANMID);
 	if (data & HECC_CANMID_IDE)
 		cf->can_id = (data & CAN_EFF_MASK) | CAN_EFF_FLAG;
@@ -551,6 +552,7 @@ static unsigned int ti_hecc_mailbox_read(struct can_rx_offload *offload,
 	}
 
 	*timestamp = hecc_read_stamp(priv, mbxno);
+	hecc_write(priv, HECC_CANRMP, mbx_mask);
 
 	return 1;
 }
@@ -701,7 +703,6 @@ static irqreturn_t ti_hecc_interrupt(int irq, void *dev_id)
 		while ((rx_pending = hecc_read(priv, HECC_CANRMP))) {
 			can_rx_offload_irq_offload_timestamp(&priv->offload,
 							     rx_pending);
-			hecc_write(priv, HECC_CANRMP, rx_pending);
 		}
 	}