linux-kernel - Re: [PATCH net-next v2 4/6] net: phylink: unset ovr_an

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Date:   Fri, 10 Jun 2022 08:31:10 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Ong Boon Leong <boon.leong.ong@...el.com>
Cc:     Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Vladimir Oltean <olteanv@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Emilio Riva <emilio.riva@...csson.com>
Subject: Re: [PATCH net-next v2 4/6] net: phylink: unset ovr_an_inband if
 fixed-link is selected

On Fri, Jun 10, 2022 at 11:29:39AM +0800, Ong Boon Leong wrote:
> If "fixed-link" DT or ACPI _DSD subnode is selected, it should take
> precedence over the value of ovr_an_inband passed by MAC driver.
> 
> Fixes: ab39385021d1 ("net: phylink: make phylink_parse_mode() support non-DT platform")
> Tested-by: Emilio Riva <emilio.riva@...csson.com>
> Signed-off-by: Ong Boon Leong <boon.leong.ong@...el.com>
> ---
>  drivers/net/phy/phylink.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index 066684b8091..566852815e0 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -609,8 +609,10 @@ static int phylink_parse_mode(struct phylink *pl, struct fwnode_handle *fwnode)
>  	const char *managed;
>  
>  	dn = fwnode_get_named_child_node(fwnode, "fixed-link");
> -	if (dn || fwnode_property_present(fwnode, "fixed-link"))
> +	if (dn || fwnode_property_present(fwnode, "fixed-link")) {
>  		pl->cfg_link_an_mode = MLO_AN_FIXED;
> +		pl->config->ovr_an_inband = false;
> +	}

ovr_an_inband was added to support "non-DT" platforms, and the only
place it's set is stmmac. I don't see why you'd want a driver to always
set this member, and then have phylink clear it - the driver should be
setting it correctly itself, otherwise it becomes a "maybe override AN
inband if certain conditions are met" flag inside phylink.

-- 
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