netdev - Re: [PATCH net-next v2 1/2] ixgbe: register a mdiobus

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Message-ID: <20181203165445.GI25748@lunn.ch>
Date:   Mon, 3 Dec 2018 17:54:45 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Steve Douthit <stephend@...icom-usa.com>
Cc:     Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next v2 1/2] ixgbe: register a mdiobus

> +static s32 ixgbe_x550em_a_mii_bus_read(struct mii_bus *bus, int addr,
> +				       int regnum)
> +{
> +	struct ixgbe_adapter *adapter = (struct ixgbe_adapter *)bus->priv;
> +	struct ixgbe_hw *hw = &adapter->hw;
> +	u32 gssr = hw->phy.phy_semaphore_mask | IXGBE_GSSR_TOKEN_SM;
> +
> +	if (hw->bus.lan_id)
> +		gssr |= IXGBE_GSSR_PHY1_SM;
> +	else
> +		gssr |= IXGBE_GSSR_PHY0_SM;

Hi Steve

If you only have one bus, do you still need this? One semaphore is all
you need. And i'm not even sure you need that. The MDIO layer will
perform locking, assuming everything goes through the MDIO layer.

	Andrew