netdev - Re: [PATCH net-next 1/4] net: dsa: move up phy enabling in core

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Date:   Fri, 22 Sep 2017 18:32:58 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next 1/4] net: dsa: move up phy enabling in core

On Fri, Sep 22, 2017 at 12:17:50PM -0400, Vivien Didelot wrote:
> bcm_sf2 is currently the only driver using the phy argument passed to
> .port_enable. It resets the state machine if the phy has been hard
> reset. This check is generic and can be moved to DSA core.
>  
>  	dsa_port_set_state_now(p->dp, stp_state);
>  
> -	if (p->phy)
> -		phy_start(p->phy);
> +	if (phy) {
> +		/* If phy_stop() has been called before, phy will be in
> +		 * halted state, and phy_start() will call resume.
> +		 *
> +		 * The resume path does not configure back autoneg
> +		 * settings, and since the internal phy may have been
> +		 * hard reset, we need to reset the state machine also.
> +		 */
> +		phy->state = PHY_READY;
> +		phy_init_hw(phy);
> +		phy_start(phy);
> +	}

Hi Vivien

If this is generic, why is it needed at all here? Shouldn't this
actually by in phylib?

Florian ?

   Andrew