netdev - Re: [PATCH net-next 2/2] net: fec: remove workaround to restart state machine on MDIO error

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Message-ID: <ecd2ecbd-799a-12be-874f-133ec72fdbba@gmail.com>
Date:   Mon, 17 Dec 2018 07:42:32 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andy Duan <fugang.duan@....com>, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/2] net: fec: remove workaround to restart state
 machine on MDIO error

On 17.12.2018 03:05, Andy Duan wrote:
> From: Heiner Kallweit <hkallweit1@...il.com> Sent: 2018年12月16日 0:20
>> Now that the PHY isn't stopped any longer by phylib in case of a MDIO error,
>> we can remove this workaround.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> 
> The old workaround can be removed NOW,  thanks.
> 
This patch series has been superseded. After few more discussions we'll
keep the current behavior and just use a WARN() to facilitate debugging
in case of MDIO error.
However for fec it should be safe anyway to remove the old workaround,
see description of my subsequent patch.

> Acked-by: Fugang Duan <fugang.duan@....com>
>> ---
>>  drivers/net/ethernet/freescale/fec.h      |  1 -
>>  drivers/net/ethernet/freescale/fec_main.c | 12 ------------
>>  2 files changed, 13 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/freescale/fec.h
>> b/drivers/net/ethernet/freescale/fec.h
>> index bf80855dd..f79e57f73 100644
>> --- a/drivers/net/ethernet/freescale/fec.h
>> +++ b/drivers/net/ethernet/freescale/fec.h
>> @@ -531,7 +531,6 @@ struct fec_enet_private {
>>
>>  	/* Phylib and MDIO interface */
>>  	struct	mii_bus *mii_bus;
>> -	int	mii_timeout;
>>  	uint	phy_speed;
>>  	phy_interface_t	phy_interface;
>>  	struct device_node *phy_node;
>> diff --git a/drivers/net/ethernet/freescale/fec_main.c
>> b/drivers/net/ethernet/freescale/fec_main.c
>> index 6db69ba30..ae0f88bce 100644
>> --- a/drivers/net/ethernet/freescale/fec_main.c
>> +++ b/drivers/net/ethernet/freescale/fec_main.c
>> @@ -1714,12 +1714,6 @@ static void fec_enet_adjust_link(struct net_device
>> *ndev)
>>  	struct phy_device *phy_dev = ndev->phydev;
>>  	int status_change = 0;
>>
>> -	/* Prevent a state halted on mii error */
>> -	if (fep->mii_timeout && phy_dev->state == PHY_HALTED) {
>> -		phy_dev->state = PHY_RESUMING;
>> -		return;
>> -	}
>> -
>>  	/*
>>  	 * If the netdev is down, or is going down, we're not interested
>>  	 * in link state events, so just mark our idea of the link as down @@
>> -1779,7 +1773,6 @@ static int fec_enet_mdio_read(struct mii_bus *bus, int
>> mii_id, int regnum)
>>  	if (ret < 0)
>>  		return ret;
>>
>> -	fep->mii_timeout = 0;
>>  	reinit_completion(&fep->mdio_done);
>>
>>  	/* start a read op */
>> @@ -1791,7 +1784,6 @@ static int fec_enet_mdio_read(struct mii_bus *bus,
>> int mii_id, int regnum)
>>  	time_left = wait_for_completion_timeout(&fep->mdio_done,
>>  			usecs_to_jiffies(FEC_MII_TIMEOUT));
>>  	if (time_left == 0) {
>> -		fep->mii_timeout = 1;
>>  		netdev_err(fep->netdev, "MDIO read timeout\n");
>>  		ret = -ETIMEDOUT;
>>  		goto out;
>> @@ -1820,7 +1812,6 @@ static int fec_enet_mdio_write(struct mii_bus *bus,
>> int mii_id, int regnum,
>>  	else
>>  		ret = 0;
>>
>> -	fep->mii_timeout = 0;
>>  	reinit_completion(&fep->mdio_done);
>>
>>  	/* start a write op */
>> @@ -1833,7 +1824,6 @@ static int fec_enet_mdio_write(struct mii_bus *bus,
>> int mii_id, int regnum,
>>  	time_left = wait_for_completion_timeout(&fep->mdio_done,
>>  			usecs_to_jiffies(FEC_MII_TIMEOUT));
>>  	if (time_left == 0) {
>> -		fep->mii_timeout = 1;
>>  		netdev_err(fep->netdev, "MDIO write timeout\n");
>>  		ret  = -ETIMEDOUT;
>>  	}
>> @@ -2001,8 +1991,6 @@ static int fec_enet_mii_init(struct platform_device
>> *pdev)
>>  		return -ENOENT;
>>  	}
>>
>> -	fep->mii_timeout = 0;
>> -
>>  	/*
>>  	 * Set MII speed to 2.5 MHz (= clk_get_rate() / 2 * phy_speed)
>>  	 *
>> --
>> 2.20.0
>>
>