[U-Boot] [PATCH v10 2/4] net: macb: Fix check for little-endian system in gmac_configure_dma()

[Joe Hershberger]

On Mon, Jul 22, 2019 at 2:54 AM Anup Patel <Anup.Patel at wdc.com> wrote:
>
> Instead of depending on CONFIG_SYS_LITTLE_ENDIAN, we check at runtime
> whether underlying system is little-endian or big-endian. This way
> we are not dependent on any U-Boot specific OR compiler specific macro
> to check system endianness.
>
> Signed-off-by: Anup Patel <anup.patel at wdc.com>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Ramon Fried <rfried.dev at gmail.com>
> ---
>  drivers/net/macb.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/macb.c b/drivers/net/macb.c
> index 3db5597373..27a6c6db2b 100644
> --- a/drivers/net/macb.c
> +++ b/drivers/net/macb.c
> @@ -84,6 +84,8 @@ struct macb_dma_desc {
>  struct macb_device {
>         void                    *regs;
>
> +       bool                    is_big_endian;
> +
>         const struct macb_config *config;
>
>         unsigned int            rx_tail;
> @@ -743,11 +745,10 @@ static void gmac_configure_dma(struct macb_device *macb)
>         dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
>         dmacfg &= ~GEM_BIT(ENDIA_PKT);
>
> -#ifdef CONFIG_SYS_LITTLE_ENDIAN
> -               dmacfg &= ~GEM_BIT(ENDIA_DESC);
> -#else
> +       if (macb->is_big_endian)
>                 dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
> -#endif
> +       else
> +               dmacfg &= ~GEM_BIT(ENDIA_DESC);
>
>         dmacfg &= ~GEM_BIT(ADDR64);
>         gem_writel(macb, DMACFG, dmacfg);
> @@ -1221,6 +1222,9 @@ static int macb_eth_probe(struct udevice *dev)
>
>         macb->regs = (void *)pdata->iobase;
>
> +       macb->is_big_endian = (cpu_to_be32(0x12345678) == 0x12345678) ?
> +                               true : false;

You don't need the "? true : false". That's a no-op. Just assign the
result of the comparison.

> +
>         macb->config = (struct macb_config *)dev_get_driver_data(dev);
>         if (!macb->config)
>                 macb->config = &default_gem_config;
> --
> 2.17.1
>
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