netdev - Re: [RFC PATCH net-next] net: phy: force phy suspend when calling phy

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Date:   Tue, 27 Aug 2019 16:29:59 +0800
From:   "shenjian (K)" <shenjian15@...wei.com>
To:     Heiner Kallweit <hkallweit1@...il.com>, <andrew@...n.ch>,
        <f.fainelli@...il.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <forest.zhouchang@...wei.com>,
        <linuxarm@...wei.com>
Subject: Re: [RFC PATCH net-next] net: phy: force phy suspend when calling
 phy_stop



在 2019/8/27 13:51, Heiner Kallweit 写道:
> On 27.08.2019 04:47, Jian Shen wrote:
>> Some ethernet drivers may call phy_start() and phy_stop() from
>> ndo_open and ndo_close() respectively.
>>
>> When network cable is unconnected, and operate like below:
>> step 1: ifconfig ethX up -> ndo_open -> phy_start ->start
>> autoneg, and phy is no link.
>> step 2: ifconfig ethX down -> ndo_close -> phy_stop -> just stop
>> phy state machine.
>> step 3: plugin the network cable, and autoneg complete, then
>> LED for link status will be on.
>> step 4: ethtool ethX --> see the result of "Link detected" is no.
>>
> Step 3 and 4 seem to be unrelated to the actual issue.
> With which MAC + PHY driver did you observe this?
> 
Thanks Heiner,

I tested this on HNS3 driver, with two phy, Marvell 88E1512 and RTL8211.

Step 3 and Step 4 is just to describe that the LED of link shows link up,
but the port information shows no link.


>> This patch forces phy suspend even phydev->link is off.
>>
>> Signed-off-by: Jian Shen <shenjian15@...wei.com>
>> ---
>>  drivers/net/phy/phy.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
>> index f3adea9..0acd5b4 100644
>> --- a/drivers/net/phy/phy.c
>> +++ b/drivers/net/phy/phy.c
>> @@ -911,8 +911,8 @@ void phy_state_machine(struct work_struct *work)
>>  		if (phydev->link) {
>>  			phydev->link = 0;
>>  			phy_link_down(phydev, true);
>> -			do_suspend = true;
>>  		}
>> +		do_suspend = true;
>>  		break;
>>  	}
>>  
>>
> Heiner
> 
>