[U-Boot] [PATCH] net: configure DWMAC DMA by default AXI burst length

[Joe Hershberger]

On Mon, Jan 26, 2015 at 8:54 PM, <sonic.adi at gmail.com> wrote:
>
> From: Sonic Zhang <sonic.zhang at analog.com>
>
> Board can define its own AXI burst length to improve DWMAC DMA
performance.
>
> Signed-off-by: Sonic Zhang <sonic.zhang at analog.com>
> ---
>
>  drivers/net/designware.c |    2 ++
>  drivers/net/designware.h |    5 +++++
>  2 files changed, 7 insertions(+)
>
> diff --git a/drivers/net/designware.c b/drivers/net/designware.c
> index 9ded895..d8d6792 100644
> --- a/drivers/net/designware.c
> +++ b/drivers/net/designware.c
> @@ -256,6 +256,8 @@ static int dw_eth_init(struct eth_device *dev, bd_t
*bis)
>
>         writel(readl(&dma_p->opmode) | RXSTART | TXSTART, &dma_p->opmode);
>
This should probably include:
+#if CONFIG_DW_AXI_BURST_LEN
so that this register is only accessed if configured.
> +       writel((CONFIG_DW_AXI_BURST_LEN & 0x1FF >> 1), &dma_p->axibus);
> +
>         /* Start up the PHY */
>         if (phy_startup(priv->phydev)) {
>                 printf("Could not initialize PHY %s\n",
> diff --git a/drivers/net/designware.h b/drivers/net/designware.h
> index ce51102..d8bd84d 100644
> --- a/drivers/net/designware.h
> +++ b/drivers/net/designware.h
> @@ -102,6 +102,11 @@ struct eth_dma_regs {
>  #define TXSECONDFRAME          (1 << 2)
>  #define RXSTART                        (1 << 1)
>
> +/* Default AXI BUS Burst length */
> +#ifndef CONFIG_DW_AXI_BURST_LEN
> +#define CONFIG_DW_AXI_BURST_LEN 0
> +#endif
> +
>  /* Descriptior related definitions */
>  #define MAC_MAX_FRAME_SZ       (1600)
>
> --
> 1.7.9.5
>