netdev - Re: [PATCH 1/2] ftgmac100: Increase reset timeout

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Date:   Mon, 24 Jul 2017 22:39:52 +0930
From:   Joel Stanley <joel@....id.au>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:     netdev@...r.kernel.org, Joel Stanley <joel.stanley@....ibm.com>
Subject: Re: [PATCH 1/2] ftgmac100: Increase reset timeout

On Mon, Jul 24, 2017 at 4:29 PM, Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
> We had reports of 50us not being sufficient to reset the MAC,
> thus hitting the "Hardware reset failed" error bringing the
> interface up on some AST2400 based machines.
>
> This bumps the timeout to 200us.
>
> Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>

I gave this a spin on the problematic hardware, as well as a few other
machines. Looks good, thanks Ben.

Tested-by: Joel Stanley <joel@....id.au>

Cheers,

Joel


> ---
>  drivers/net/ethernet/faraday/ftgmac100.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
> index b166666128d3..2b17f7023d91 100644
> --- a/drivers/net/ethernet/faraday/ftgmac100.c
> +++ b/drivers/net/ethernet/faraday/ftgmac100.c
> @@ -125,7 +125,7 @@ static int ftgmac100_reset_mac(struct ftgmac100 *priv, u32 maccr)
>         iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR);
>         iowrite32(maccr | FTGMAC100_MACCR_SW_RST,
>                   priv->base + FTGMAC100_OFFSET_MACCR);
> -       for (i = 0; i < 50; i++) {
> +       for (i = 0; i < 200; i++) {
>                 unsigned int maccr;
>
>                 maccr = ioread32(priv->base + FTGMAC100_OFFSET_MACCR);