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Date:   Thu, 8 Apr 2021 05:45:11 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Fugang Duan <fugang.duan@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next 2/3] net: fec: use mac-managed PHY PM


> -----Original Message-----
> From: Heiner Kallweit <hkallweit1@...il.com>
> Sent: 2021年4月7日 23:53
> To: Andrew Lunn <andrew@...n.ch>; Russell King - ARM Linux
> <linux@...linux.org.uk>; Jakub Kicinski <kuba@...nel.org>; David Miller
> <davem@...emloft.net>; Fugang Duan <fugang.duan@....com>
> Cc: netdev@...r.kernel.org; Joakim Zhang <qiangqing.zhang@....com>
> Subject: [PATCH net-next 2/3] net: fec: use mac-managed PHY PM
> 
> Use the new mac_managed_pm flag to work around an issue with KSZ8081
> PHY that becomes unstable when a soft reset is triggered during aneg.
> 
> Reported-by: Joakim Zhang <qiangqing.zhang@....com>
> Tested-by: Joakim Zhang <qiangqing.zhang@....com>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  drivers/net/ethernet/freescale/fec_main.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/freescale/fec_main.c
> b/drivers/net/ethernet/freescale/fec_main.c
> index 3db882322..70aea9c27 100644
> --- a/drivers/net/ethernet/freescale/fec_main.c
> +++ b/drivers/net/ethernet/freescale/fec_main.c
> @@ -2048,6 +2048,8 @@ static int fec_enet_mii_probe(struct net_device
> *ndev)
>  	fep->link = 0;
>  	fep->full_duplex = 0;
> 
> +	phy_dev->mac_managed_pm = 1;
> +
>  	phy_attached_info(phy_dev);
> 
>  	return 0;
> @@ -3864,6 +3866,7 @@ static int __maybe_unused fec_resume(struct
> device *dev)
>  		netif_device_attach(ndev);
>  		netif_tx_unlock_bh(ndev);
>  		napi_enable(&fep->napi);
> +		phy_init_hw(ndev->phydev);


For now, I think we doesn't need to re-initialize PHY after MAC resume back, it also can be done by PHY driver if it needed.

Best Regards,
Joakim Zhang
>  		phy_start(ndev->phydev);
>  	}
>  	rtnl_unlock();
> --
> 2.31.1
> 

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