All SoCs with this IP core support 8 burst length. Hauke suggested to hardcode this value and simplify the driver. Link: https://lkml.org/lkml/2021/9/14/1533 Signed-off-by: Aleksander Jan Bajkowski <olek2@xxxxx> --- drivers/net/ethernet/lantiq_xrx200.c | 21 ++++----------------- 1 file changed, 4 insertions(+), 17 deletions(-) diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/lantiq_xrx200.c index ecf1e11d9b91..0da09ea81980 100644 --- a/drivers/net/ethernet/lantiq_xrx200.c +++ b/drivers/net/ethernet/lantiq_xrx200.c @@ -25,6 +25,7 @@ #define XRX200_DMA_DATA_LEN (SZ_64K - 1) #define XRX200_DMA_RX 0 #define XRX200_DMA_TX 1 +#define XRX200_DMA_BURST_LEN 8 /* cpu port mac */ #define PMAC_RX_IPG 0x0024 @@ -73,9 +74,6 @@ struct xrx200_priv { struct net_device *net_dev; struct device *dev; - int tx_burst_len; - int rx_burst_len; - __iomem void *pmac_reg; }; @@ -323,7 +321,7 @@ static netdev_tx_t xrx200_start_xmit(struct sk_buff *skb, goto err_drop; /* dma needs to start on a burst length value aligned address */ - byte_offset = mapping % (priv->tx_burst_len * 4); + byte_offset = mapping % (XRX200_DMA_BURST_LEN * 4); desc->addr = mapping - byte_offset; /* Make sure the address is written before we give it to HW */ @@ -422,7 +420,8 @@ static int xrx200_dma_init(struct xrx200_priv *priv) int ret = 0; int i; - ltq_dma_init_port(DMA_PORT_ETOP, priv->tx_burst_len, rx_burst_len); + ltq_dma_init_port(DMA_PORT_ETOP, XRX200_DMA_BURST_LEN, + XRX200_DMA_BURST_LEN); ch_rx->dma.nr = XRX200_DMA_RX; ch_rx->dma.dev = priv->dev; @@ -531,18 +530,6 @@ static int xrx200_probe(struct platform_device *pdev) if (err) eth_hw_addr_random(net_dev); - err = device_property_read_u32(dev, "lantiq,tx-burst-length", &priv->tx_burst_len); - if (err < 0) { - dev_err(dev, "unable to read tx-burst-length property\n"); - return err; - } - - err = device_property_read_u32(dev, "lantiq,rx-burst-length", &priv->rx_burst_len); - if (err < 0) { - dev_err(dev, "unable to read rx-burst-length property\n"); - return err; - } - /* bring up the dma engine and IP core */ err = xrx200_dma_init(priv); if (err) -- 2.30.2
