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

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Date:	Thu, 13 Aug 2015 10:15:15 -0700
From:	Joe Perches <joe@...ches.com>
To:	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 20:11 +0300, Igor Plyatov wrote:
> > 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?
> 
> There is no strict requirement to move declaration of the rc.
> It was made just to have all declarations easily visible.

Generally it's better to have declarations
in the minimal/narrowest scope possible.


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