net/macb: clear tx/rx completion flags in ISR

At least in the cadence IP core on the Xilinx Zynq SoC the TCOMP/RCOMP flags
are not auto-cleaned. As these flags are evaluated, they need to be cleaned.

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index 3a5d680..3593c2c 100644 (file)
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -485,6 +485,8 @@ static void macb_tx_interrupt(struct macb *bp)
        status = macb_readl(bp, TSR);
        macb_writel(bp, TSR, status);
 
+       macb_writel(bp, ISR, MACB_BIT(TCOMP));
+
        netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n",
                (unsigned long)status);
 
@@ -736,6 +738,7 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
                         * now.
                         */
                        macb_writel(bp, IDR, MACB_RX_INT_FLAGS);
+                       macb_writel(bp, ISR, MACB_BIT(RCOMP));
 
                        if (napi_schedule_prep(&bp->napi)) {
                                netdev_vdbg(bp->dev, "scheduling RX softirq\n");