linux-kernel - Re: [PATCH] net: phy: workaround for buggy cable detection by LAN8700 after cable plugging

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Message-ID: <1439484648.4818.13.camel@perches.com>
Date:	Thu, 13 Aug 2015 09:50:48 -0700
From:	Joe Perches <joe@...ches.com>
To:	Igor Plyatov <plyatov@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	f.fainelli@...il.com, luwei.zhou@...escale.com,
	richardcochran@...il.com, davem@...emloft.net,
	u.kleine-koenig@...gutronix.de, Fabio.Estevam@...escale.com,
	LW@...O-electronics.de, Frank.Li@...escale.com
Subject: Re: [PATCH] net: phy: workaround for buggy cable detection by
 LAN8700 after cable plugging

On Thu, 2015-08-13 at 16:12 +0300, Igor Plyatov wrote:
> * Due to HW bug, LAN8700 sometimes does not detect presence of energy in the
>   Ethernet cable in Energy Detect Power-Down mode (e.g while EDPWRDOWN bit is
>   set, the ENERGYON bit does not asserted sometimes). This is a common bug of
>   LAN87xx family of PHY chips.
> * The lan87xx_read_status() was improved to acquire ENERGYON bit. Its previous
>   algorythm still not reliable on 100 % and sometimes skip cable plugging.
[]
> diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
[]
> @@ -104,10 +104,12 @@ static int lan911x_config_init(struct phy_device *phydev)
>  static int lan87xx_read_status(struct phy_device *phydev)
>  {
>  	int err = genphy_read_status(phydev);
> +	int rc;

Is there a reason to move this declaration?

> +	int i;
>  
>  	if (!phydev->link) {
>  		/* Disable EDPD to wake up PHY */
> -		int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
> +		rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
>  		if (rc < 0)
>  			return rc;
>  


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