netdev - Re: [RFC net 1/1] net: stmmac: skip PHY scanning when PHY already attached in DT mode

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Message-ID: <d4750775-5d74-a081-f7a4-11d67fdb80ea@samsung.com>
Date:   Tue, 4 Apr 2023 18:54:45 +0200
From:   Marek Szyprowski <m.szyprowski@...sung.com>
To:     Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Ong Boon Leong <boon.leong.ong@...el.com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux@...linux.org.uk, hkallweit1@...il.com, andrew@...n.ch,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Looi Hong Aun <hong.aun.looi@...el.com>,
        Voon Weifeng <weifeng.voon@...el.com>,
        Lai Peter Jun Ann <peter.jun.ann.lai@...el.com>,
        Zulkifli Muhammad Husaini <muhammad.husaini.zulkifli@...el.com>,
        Tan Tee Min <tee.min.tan@...el.com>,
        hock.leong.kweh@...el.com
Subject: Re: [RFC net 1/1] net: stmmac: skip PHY scanning when PHY already
 attached in DT mode

Hi,

On 04.04.2023 11:14, Michael Sit Wei Hong wrote:
> If PHY is successfully attached during phylink_fwnode_phy_connect()
> in DT mode. MAC should not need to scan for PHY again.
>
> Adding a logic to check if ovr_an_inband is set before scanning for
> a PHY, since phylink_fwnode_phy_connect() returns 0 when
>
> 	phy_fwnode = fwnode_get_phy_node(fwnode);
> 	if (IS_ERR(phy_fwnode)) {
> 		if (pl->cfg_link_an_mode == MLO_AN_PHY)
> 			return -ENODEV;
> 		return 0;
> 	}
>
> Fixes: fe2cfbc96803 ("net: stmmac: check if MAC needs to attach to a PHY")
> Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@...el.com>

This fixes broken ethernet observed recently on various Amlogic Meson 
based boards (like Khadas VIM3 or Odroid-C4). Thanks!

Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

> ---
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index d41a5f92aee7..4b8d3d975678 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -1149,7 +1149,7 @@ static int stmmac_init_phy(struct net_device *dev)
>   	/* Some DT bindings do not set-up the PHY handle. Let's try to
>   	 * manually parse it
>   	 */
> -	if (!fwnode || phy_needed || ret) {
> +	if (!fwnode || (phy_needed && priv->phylink_config.ovr_an_inband) || ret) {
>   		int addr = priv->plat->phy_addr;
>   		struct phy_device *phydev;
>   

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland