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| author | Doug Berger <opendmb@gmail.com> | 2017-03-13 17:41:37 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-13 21:51:50 -0700 |
| commit | d5810ca3252a5bf61e5b2fc789da456e0f65ba8c (patch) | |
| tree | 38ae9f7083a187224cf23a081936a9b01745307c /drivers/net/ethernet/broadcom/genet | |
| parent | b1ec494deea8322e88063c8a6bee903255a0590d (diff) | |
| download | linux-d5810ca3252a5bf61e5b2fc789da456e0f65ba8c.tar.gz linux-d5810ca3252a5bf61e5b2fc789da456e0f65ba8c.tar.bz2 linux-d5810ca3252a5bf61e5b2fc789da456e0f65ba8c.zip | |
net: bcmgenet: clear status to reduce spurious interrupts
Since the DMA interrupt status is latched and the DMA servicing can be
polled, it is a good idea to clear the latched status of a DMA interrupt
before performing the service that would be invoked by the interrupt.
This prevents old status from causing spurious interrupts when the
interrupt is unmasked at a later time.
Signed-off-by: Doug Berger <opendmb@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/broadcom/genet')
| -rw-r--r-- | drivers/net/ethernet/broadcom/genet/bcmgenet.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c index 661ca1b39c89..1f94ba1773dd 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -1174,6 +1174,14 @@ static unsigned int __bcmgenet_tx_reclaim(struct net_device *dev, unsigned int txbds_ready; unsigned int txbds_processed = 0; + /* Clear status before servicing to reduce spurious interrupts */ + if (ring->index == DESC_INDEX) + bcmgenet_intrl2_0_writel(priv, UMAC_IRQ_TXDMA_DONE, + INTRL2_CPU_CLEAR); + else + bcmgenet_intrl2_1_writel(priv, (1 << ring->index), + INTRL2_CPU_CLEAR); + /* Compute how many buffers are transmitted since last xmit call */ c_index = bcmgenet_tdma_ring_readl(priv, ring->index, TDMA_CONS_INDEX) & DMA_C_INDEX_MASK; @@ -1584,10 +1592,21 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_rx_ring *ring, unsigned long dma_flag; int len; unsigned int rxpktprocessed = 0, rxpkttoprocess; - unsigned int p_index; + unsigned int p_index, mask; unsigned int discards; unsigned int chksum_ok = 0; + /* Clear status before servicing to reduce spurious interrupts */ + if (ring->index == DESC_INDEX) { + bcmgenet_intrl2_0_writel(priv, UMAC_IRQ_RXDMA_DONE, + INTRL2_CPU_CLEAR); + } else { + mask = 1 << (UMAC_IRQ1_RX_INTR_SHIFT + ring->index); + bcmgenet_intrl2_1_writel(priv, + mask, + INTRL2_CPU_CLEAR); + } + p_index = bcmgenet_rdma_ring_readl(priv, ring->index, RDMA_PROD_INDEX); discards = (p_index >> DMA_P_INDEX_DISCARD_CNT_SHIFT) & |