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

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Message-ID: <55CCEE9D.7050302@gmail.com>
Date:	Thu, 13 Aug 2015 22:23:09 +0300
From:	Igor Plyatov <plyatov@...il.com>
To:	David Miller <davem@...emloft.net>, joe@...ches.com
CC:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	f.fainelli@...il.com, luwei.zhou@...escale.com,
	richardcochran@...il.com, 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 David and Joe,

thank you for patch review!

Please look at email with subject
"[PATCH v2] net: phy: workaround for buggy cable detection by LAN8700 
after cable plugging"

Best wishes.
--
Igor Plyatov

> From: Joe Perches <joe@...ches.com>
> Date: Thu, 13 Aug 2015 10:15:15 -0700
>
>> 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.
> Agreed, and it's %100 unrelated to the purpose of this patch so not
> should be included for that reason as well.
>
> You will need to respin this patch with the variable moving elided.

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