linux-kernel - Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is up without PHY

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Message-ID: <20200127112102.GT25745@shell.armlinux.org.uk>
Date:   Mon, 27 Jan 2020 11:21:02 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     netdev@...r.kernel.org, Joao Pinto <Joao.Pinto@...opsys.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is
 up without PHY

On Mon, Jan 27, 2020 at 12:09:11PM +0100, Jose Abreu wrote:
> When we don't have any real PHY driver connected and we get link up from
> PCS we shall configure MAC and PCS for the desired speed and also
> resolve the flow control settings from MAC side.

This is certainly the wrong place for it.  Please hold off on this patch
for the time being.  Thanks.

> 
> Signed-off-by: Jose Abreu <Jose.Abreu@...opsys.com>
> 
> ---
> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>
> Cc: Alexandre Torgue <alexandre.torgue@...com>
> Cc: Jose Abreu <joabreu@...opsys.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
> Cc: Russell King <linux@...linux.org.uk>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Florian Fainelli <f.fainelli@...il.com>
> Cc: Heiner Kallweit <hkallweit1@...il.com>
> Cc: netdev@...r.kernel.org
> Cc: linux-stm32@...md-mailman.stormreply.com
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/net/phy/phylink.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 4174d874b1f7..75dbaf80d7a5 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -533,10 +533,20 @@ static void phylink_resolve(struct work_struct *w)
>  
>  	if (link_changed) {
>  		pl->old_link_state = link_state.link;
> -		if (!link_state.link)
> +		if (!link_state.link) {
>  			phylink_mac_link_down(pl);
> -		else
> +		} else {
> +			/* If no PHY is connected, we still need to configure
> +			 * MAC/PCS for flow control and speed.
> +			 */
> +			if (!pl->phydev) {
> +				phylink_resolve_flow(pl, &link_state);
> +				phylink_mac_config(pl, &link_state);
> +			}
> +
>  			phylink_mac_link_up(pl, link_state);
> +		}
> +
>  	}
>  	if (!link_state.link && pl->mac_link_dropped) {
>  		pl->mac_link_dropped = false;
> -- 
> 2.7.4
> 
> 

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