linux-kernel - Re: [PATCH 4/4] net: stmmac: stmmac_platform: use correct setup function for gmac4

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Date:   Thu, 24 Nov 2016 18:58:35 +0100
From:   Alexandre Torgue <alexandre.torgue@...com>
To:     Niklas Cassel <niklas.cassel@...s.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>
CC:     Niklas Cassel <niklass@...s.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] net: stmmac: stmmac_platform: use correct setup
 function for gmac4

Hi Niklas,

On 11/23/2016 03:25 PM, Niklas Cassel wrote:
> From: Niklas Cassel <niklas.cassel@...s.com>
>
> devicetree binding for stmmac states:
> - compatible: Should be "snps,dwmac-<ip_version>", "snps,dwmac"
> 	For backwards compatibility: "st,spear600-gmac" is also supported.
>
> Previously, when specifying "snps,dwmac-4.10a", "snps,dwmac" as your
> compatible string, plat_stmmacenet_data would have both has_gmac and
> has_gmac4 set.
>
> This would lead to stmmac_hw_init calling dwmac1000_setup rather than
> dwmac4_setup, resulting in a non-functional driver.
> This happened since the check for has_gmac is done before the check for
> has_gmac4. However, the order should not matter, so it does not make sense
> to have both set.

Well spot.

>
> If something is valid for both, you should do as the stmmac_interrupt does:
> if (priv->plat->has_gmac || priv->plat->has_gmac4) ...
>
> The places where it was obvious that the author actually meant
> if (has_gmac || has_gmac4) rather than if (has_gmac) has been updated.
>
> Signed-off-by: Niklas Cassel <niklas.cassel@...s.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c  | 4 ++--
>  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 1 +
>  2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> index d5a8122b6033..dd5b38e4cd1f 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
> @@ -263,7 +263,7 @@ static void stmmac_ethtool_getdrvinfo(struct net_device *dev,
>  {
>  	struct stmmac_priv *priv = netdev_priv(dev);
>
> -	if (priv->plat->has_gmac)
> +	if (priv->plat->has_gmac || priv->plat->has_gmac4)
>  		strlcpy(info->driver, GMAC_ETHTOOL_NAME, sizeof(info->driver));
>  	else
>  		strlcpy(info->driver, MAC100_ETHTOOL_NAME,
> @@ -448,7 +448,7 @@ static void stmmac_ethtool_gregs(struct net_device *dev,
>
>  	memset(reg_space, 0x0, REG_SPACE_SIZE);
>
> -	if (!priv->plat->has_gmac) {
> +	if (!(priv->plat->has_gmac || priv->plat->has_gmac4)) {
>  		/* MAC registers */
>  		for (i = 0; i < 12; i++)
>  			reg_space[i] = readl(priv->ioaddr + (i * 4));
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 4d544c34c1f2..c8a59f396c6e 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -291,6 +291,7 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
>  	if (of_device_is_compatible(np, "snps,dwmac-4.00") ||
>  	    of_device_is_compatible(np, "snps,dwmac-4.10a")) {
>  		plat->has_gmac4 = 1;
> +		plat->has_gmac = 0;
>  		plat->pmt = 1;
>  		plat->tso_en = of_property_read_bool(np, "snps,tso");
>  	}
>
Thanks Niklas, Acked-by: <alexandre.torgue@...com>

Regards
Alex