netdev - Re: [PATCH net-next v2 1/3] net: ethernet: mediatek: Add basic PHYLINK support

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Message-ID: <20190822142739.GS13294@shell.armlinux.org.uk>
Date:   Thu, 22 Aug 2019 15:27:40 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     René van Dorst <opensource@...rst.com>
Cc:     John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Nelson Chang <nelson.chang@...iatek.com>,
        "David S . Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        netdev@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, Stefan Roese <sr@...x.de>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH net-next v2 1/3] net: ethernet: mediatek: Add basic
 PHYLINK support

On Wed, Aug 21, 2019 at 04:43:34PM +0200, René van Dorst wrote:
> +static void mtk_mac_link_down(struct phylink_config *config, unsigned int mode,
> +			      phy_interface_t interface)
> +{
> +	struct mtk_mac *mac = container_of(config, struct mtk_mac,
> +					   phylink_config);
>  
> -	return 0;
> +	mtk_w32(mac->hw, MAC_MCR_FORCE_LINK_DOWN, MTK_MAC_MCR(mac->id));
>  }

You set the MAC_MCR_FORCE_MODE bit here...

> +static void mtk_mac_link_up(struct phylink_config *config, unsigned int mode,
> +			    phy_interface_t interface,
> +			    struct phy_device *phy)
>  {
> +	struct mtk_mac *mac = container_of(config, struct mtk_mac,
> +					   phylink_config);
> +	u32 mcr = mtk_r32(mac->hw, MTK_MAC_MCR(mac->id));
>  
> +	mcr |= MAC_MCR_TX_EN | MAC_MCR_RX_EN;
> +	mtk_w32(mac->hw, mcr, MTK_MAC_MCR(mac->id));
> +}

Looking at this, a link_down() followed by a link_up() would result in
this register containing MAC_MCR_FORCE_MODE | MAC_MCR_TX_EN |
MAC_MCR_RX_EN ?  Is that actually correct?  (MAC_MCR_FORCE_LINK isn't
set, so it looks to me like it still forces the link down.)

Note that link up/down forcing should not be done for in-band AN.

> +static void mtk_validate(struct phylink_config *config,
> +			 unsigned long *supported,
> +			 struct phylink_link_state *state)
> +{
> +	struct mtk_mac *mac = container_of(config, struct mtk_mac,
> +					   phylink_config);
> +	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
>  
> +	if (state->interface != PHY_INTERFACE_MODE_NA &&
> +	    state->interface != PHY_INTERFACE_MODE_MII &&
> +	    state->interface != PHY_INTERFACE_MODE_GMII &&
> +	    !(MTK_HAS_CAPS(mac->hw->soc->caps, MTK_RGMII) &&
> +	      phy_interface_mode_is_rgmii(state->interface)) &&
> +	    !(MTK_HAS_CAPS(mac->hw->soc->caps, MTK_TRGMII) &&
> +	      !mac->id && state->interface == PHY_INTERFACE_MODE_TRGMII)) {
> +		linkmode_zero(supported);
> +		return;
>  	}
>  
> +	phylink_set_port_modes(mask);
> +	phylink_set(mask, Autoneg);
>  
> +	if (state->interface == PHY_INTERFACE_MODE_TRGMII) {
> +		phylink_set(mask, 1000baseT_Full);
> +	} else {
> +		phylink_set(mask, 10baseT_Half);
> +		phylink_set(mask, 10baseT_Full);
> +		phylink_set(mask, 100baseT_Half);
> +		phylink_set(mask, 100baseT_Full);
> +
> +		if (state->interface != PHY_INTERFACE_MODE_MII) {
> +			phylink_set(mask, 1000baseT_Half);
> +			phylink_set(mask, 1000baseT_Full);
> +			phylink_set(mask, 1000baseX_Full);
> +		}
> +	}
>  
> +	phylink_set(mask, Pause);
> +	phylink_set(mask, Asym_Pause);
>  
> +	linkmode_and(supported, supported, mask);
> +	linkmode_and(state->advertising, state->advertising, mask);
>  }

This looks fine.

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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