can: ti_hecc: keep MIM and MD set

The HECC_CANMIM is set in the xmit path and cleared in the interrupt.
Since this is done with a read, modify, write action the register might
end up with some more MIM enabled then intended, since it is not
protected. That doesn't matter at all, since the tx interrupt disables
the mailbox with HECC_CANME (while holding a spinlock). So lets just
always keep MIM set.

While at it, since the mailbox direction never changes, don't set it
every time a message is send, ti_hecc_reset() already sets them to tx.

Signed-off-by: Jeroen Hofstee <jhofstee@victronenergy.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index eb8151154083b2f62711bf5bc1aa07b6d59823bb..d6a84f8ff863d3a8f282cd4ab7a5c470af9a48ac 100644 (file)
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -382,6 +382,9 @@ static void ti_hecc_start(struct net_device *ndev)
                hecc_set_bit(priv, HECC_CANMIM, mbx_mask);
        }
 
+       /* Enable tx interrupts */
+       hecc_set_bit(priv, HECC_CANMIM, BIT(HECC_MAX_TX_MBOX) - 1);
+
        /* Prevent message over-write & Enable interrupts */
        hecc_write(priv, HECC_CANOPC, HECC_SET_REG);
        if (priv->use_hecc1int) {
@@ -511,8 +514,6 @@ static netdev_tx_t ti_hecc_xmit(struct sk_buff *skb, struct net_device *ndev)
        hecc_set_bit(priv, HECC_CANME, mbx_mask);
        spin_unlock_irqrestore(&priv->mbx_lock, flags);
 
-       hecc_clear_bit(priv, HECC_CANMD, mbx_mask);
-       hecc_set_bit(priv, HECC_CANMIM, mbx_mask);
        hecc_write(priv, HECC_CANTRS, mbx_mask);
 
        return NETDEV_TX_OK;
@@ -676,7 +677,6 @@ static irqreturn_t ti_hecc_interrupt(int irq, void *dev_id)
                        mbx_mask = BIT(mbxno);
                        if (!(mbx_mask & hecc_read(priv, HECC_CANTA)))
                                break;
-                       hecc_clear_bit(priv, HECC_CANMIM, mbx_mask);
                        hecc_write(priv, HECC_CANTA, mbx_mask);
                        spin_lock_irqsave(&priv->mbx_lock, flags);
                        hecc_clear_bit(priv, HECC_CANME, mbx_mask);