Commit de594488 authored by Marc Kleine-Budde's avatar Marc Kleine-Budde

can: flexcan: put TX mailbox into TX_INACTIVE mode after tx-complete

After sending a RTR frame the TX mailbox becomes a RX_EMPTY mailbox. To avoid
side effects when the RX-FIFO is full, this patch puts the TX mailbox into
TX_INACTIVE mode in the transmission complete interrupt handler. This, of
course, leaves a race window between the actual completion of the transmission
and the handling of tx-complete interrupt. However this is the best we can do
without busy polling the tx complete interrupt.

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 25e92445
...@@ -765,6 +765,9 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id) ...@@ -765,6 +765,9 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
stats->tx_bytes += can_get_echo_skb(dev, 0); stats->tx_bytes += can_get_echo_skb(dev, 0);
stats->tx_packets++; stats->tx_packets++;
can_led_event(dev, CAN_LED_EVENT_TX); can_led_event(dev, CAN_LED_EVENT_TX);
/* after sending a RTR frame mailbox is in RX mode */
flexcan_write(FLEXCAN_MB_CODE_TX_INACTIVE,
&regs->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl);
flexcan_write((1 << FLEXCAN_TX_BUF_ID), &regs->iflag1); flexcan_write((1 << FLEXCAN_TX_BUF_ID), &regs->iflag1);
netif_wake_queue(dev); netif_wake_queue(dev);
} }
......
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