netdev - Re: [PATCH net] net: bcmgenet: Remove excessive PHY reset

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Message-ID: <55A8051B.4060506@gmail.com>
Date:	Thu, 16 Jul 2015 12:25:15 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	netdev@...r.kernel.org
CC:	davem@...emloft.net, pgynther@...gle.com, jaedon.shin@...il.com
Subject: Re: [PATCH net] net: bcmgenet: Remove excessive PHY reset

On 14/07/15 12:37, Florian Fainelli wrote:
> We are currently issuing multiple PHY resets during a suspend/resume,
> first during bcmgenet_power_up() which does a hardware reset, then a
> software reset by calling bcmgenet_mii_reset(). This is both unnecessary
> and can take as long as 10ms per MDIO transactions while we re-apply
> workarounds because we do not yet have MDIO interrupts enabled.
> 
> phy_resume() takes care of re-apply our workarounds in case we need any,
> and bcmgenet_power_up() does a PHY hardware reset, all of this is more
> than enough to guarantee that the PHY operates correctly.

David, please discard this version, I will send one which actually
compiles, sorry about that.

> 
> Fixes: 1c1008c793fa4 ("net: bcmgenet: add main driver file")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/net/ethernet/broadcom/genet/bcmgenet.c |  3 ---
>  drivers/net/ethernet/broadcom/genet/bcmgenet.h |  1 -
>  drivers/net/ethernet/broadcom/genet/bcmmii.c   | 10 ----------
>  3 files changed, 14 deletions(-)
> 
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> index 64c1e9db6b0b..674f374dceee 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
> @@ -907,9 +907,6 @@ static void bcmgenet_power_up(struct bcmgenet_priv *priv,
>  	}
>  
>  	bcmgenet_ext_writel(priv, reg, EXT_EXT_PWR_MGMT);
> -
> -	if (mode == GENET_POWER_PASSIVE)
> -		bcmgenet_mii_reset(priv->dev);
>  }
>  
>  /* ioctl handle special commands that are not present in ethtool. */
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.h b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
> index 6159deab8c98..9f9ac0089d4d 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.h
> +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.h
> @@ -672,7 +672,6 @@ GENET_IO_MACRO(rbuf, GENET_RBUF_OFF);
>  int bcmgenet_mii_init(struct net_device *dev);
>  int bcmgenet_mii_config(struct net_device *dev, bool init);
>  void bcmgenet_mii_exit(struct net_device *dev);
> -void bcmgenet_mii_reset(struct net_device *dev);
>  void bcmgenet_phy_power_set(struct net_device *dev, bool enable);
>  void bcmgenet_mii_setup(struct net_device *dev);
>  
> diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c b/drivers/net/ethernet/broadcom/genet/bcmmii.c
> index adf23d2ac488..2a8f97299b13 100644
> --- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
> +++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
> @@ -163,16 +163,6 @@ void bcmgenet_mii_setup(struct net_device *dev)
>  	phy_print_status(phydev);
>  }
>  
> -void bcmgenet_mii_reset(struct net_device *dev)
> -{
> -	struct bcmgenet_priv *priv = netdev_priv(dev);
> -
> -	if (priv->phydev) {
> -		phy_init_hw(priv->phydev);
> -		phy_start_aneg(priv->phydev);
> -	}
> -}
> -
>  void bcmgenet_phy_power_set(struct net_device *dev, bool enable)
>  {
>  	struct bcmgenet_priv *priv = netdev_priv(dev);
> 


-- 
Florian
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