From: Matthias Brugger <[email protected]> Depending on the HW, the maximal usable DMA burst size can vary. If not set accordingly a timeout in the transmit queue happens and no package can be sent. Read to optional max-burst-sz property, if not present, fallback to the standard value.
Signed-off-by: Matthias Brugger <[email protected]> --- drivers/net/ethernet/broadcom/genet/bcmgenet.c | 13 +++++++++++-- drivers/net/ethernet/broadcom/genet/bcmgenet.h | 1 + 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c index 12cb77ef1081..a7bb822a6d83 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -2576,7 +2576,8 @@ static int bcmgenet_init_dma(struct bcmgenet_priv *priv) } /* Init rDma */ - bcmgenet_rdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE); + bcmgenet_rdma_writel(priv, priv->dma_max_burst_length, + DMA_SCB_BURST_SIZE); /* Initialize Rx queues */ ret = bcmgenet_init_rx_queues(priv->dev); @@ -2589,7 +2590,8 @@ static int bcmgenet_init_dma(struct bcmgenet_priv *priv) } /* Init tDma */ - bcmgenet_tdma_writel(priv, DMA_MAX_BURST_LENGTH, DMA_SCB_BURST_SIZE); + bcmgenet_tdma_writel(priv, priv->dma_max_burst_length, + DMA_SCB_BURST_SIZE); /* Initialize Tx queues */ bcmgenet_init_tx_queues(priv->dev); @@ -3522,6 +3524,13 @@ static int bcmgenet_probe(struct platform_device *pdev) clk_prepare_enable(priv->clk); + if (dn) { + of_property_read_u32(dn, "dma-burst-sz", + &priv->dma_max_burst_length); + } else { + priv->dma_max_burst_length = DMA_MAX_BURST_LENGTH; + } + bcmgenet_set_hw_params(priv); /* Mii wait queue */ diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h index 4a8fc03d82fd..897f356eb376 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h @@ -663,6 +663,7 @@ struct bcmgenet_priv { bool crc_fwd_en; unsigned int dma_rx_chk_bit; + unsigned int dma_max_burst_length; u32 msg_enable; -- 2.23.0
