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

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Date:	Thu, 13 Aug 2015 20:11:59 +0300
From:	Igor Plyatov <plyatov@...il.com>
To:	Joe Perches <joe@...ches.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

Dear Joe,

> 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.

>> +	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;
>>   
>

Best wishes
--
Igor Plyatov
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