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

From: Russell King - ARM Linux admin <linux@armlinux.org.uk>
To: Jose Abreu <Jose.Abreu@synopsys.com>
Cc: Andrew Lunn <andrew@lunn.ch>,
	Joao Pinto <Joao.Pinto@synopsys.com>,
	Alexandre Torgue <alexandre.torgue@st.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	Florian Fainelli <f.fainelli@gmail.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Giuseppe Cavallaro <peppe.cavallaro@st.com>,
	Jakub Kicinski <kuba@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	linux-arm-kernel@lists.infradead.org,
	Heiner Kallweit <hkallweit1@gmail.com>
Subject: Re: [RFC net-next 6/8] net: phylink: Configure MAC/PCS when link is up without PHY
Date: Mon, 27 Jan 2020 11:21:02 +0000	[thread overview]
Message-ID: <20200127112102.GT25745@shell.armlinux.org.uk> (raw)
In-Reply-To: <9a2136885d9a892ff170be88fdffeda82c778a10.1580122909.git.Jose.Abreu@synopsys.com>

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@synopsys.com>
> 
> ---
> Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
> Cc: Alexandre Torgue <alexandre.torgue@st.com>
> Cc: Jose Abreu <joabreu@synopsys.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
> Cc: Russell King <linux@armlinux.org.uk>
> Cc: Andrew Lunn <andrew@lunn.ch>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Heiner Kallweit <hkallweit1@gmail.com>
> Cc: netdev@vger.kernel.org
> Cc: linux-stm32@st-md-mailman.stormreply.com
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.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/
FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
According to speedtest.net: 11.9Mbps down 500kbps up

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