netdev - Re: [PATCH NET V6 1/2] net: phy: Add phy loopback support in net phy framework

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Date:   Wed, 28 Jun 2017 08:33:12 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     Madalin-cristian Bucur <madalin.bucur@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>
CC:     "huangdaode@...ilicon.com" <huangdaode@...ilicon.com>,
        "xuwei5@...ilicon.com" <xuwei5@...ilicon.com>,
        "liguozhu@...ilicon.com" <liguozhu@...ilicon.com>,
        "Yisen.Zhuang@...wei.com" <Yisen.Zhuang@...wei.com>,
        "gabriele.paoloni@...wei.com" <gabriele.paoloni@...wei.com>,
        "john.garry@...wei.com" <john.garry@...wei.com>,
        "linuxarm@...wei.com" <linuxarm@...wei.com>,
        "salil.mehta@...wei.com" <salil.mehta@...wei.com>,
        "lipeng321@...wei.com" <lipeng321@...wei.com>,
        "tremyfr@...il.com" <tremyfr@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH NET V6 1/2] net: phy: Add phy loopback support in net phy
 framework

Hi, Madalin

On 2017/6/27 19:48, Madalin-cristian Bucur wrote:
>> -----Original Message-----
>> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>> On Behalf Of Lin Yun Sheng
>> Sent: Tuesday, June 27, 2017 2:01 PM
>> To: davem@...emloft.net; andrew@...n.ch; f.fainelli@...il.com
>> Cc: huangdaode@...ilicon.com; xuwei5@...ilicon.com;
>> liguozhu@...ilicon.com; Yisen.Zhuang@...wei.com;
>> gabriele.paoloni@...wei.com; john.garry@...wei.com; linuxarm@...wei.com;
>> yisen.zhuang@...wei.com; salil.mehta@...wei.com; lipeng321@...wei.com;
>> tremyfr@...il.com; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
>> Subject: [PATCH NET V6 1/2] net: phy: Add phy loopback support in net phy
>> framework
>>
>> This patch add set_loopback in phy_driver, which is used by Mac
>> driver to enable or disable a phy. it also add a generic
>> genphy_loopback function, which use BMCR loopback bit to enable
>> or disable a phy.
> 
> "disable a phy" or disable the PHY loopback function?
It should be disable the PHY loopback function, thanks for pointing out.

> 

>> @@ -1123,6 +1123,39 @@ int phy_resume(struct phy_device *phydev)
>>  }
>>  EXPORT_SYMBOL(phy_resume);
>>
>> +int phy_loopback(struct phy_device *phydev, bool enable)
>> +{
>> +	struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
>> +	int ret = 0;
>> +
>> +	mutex_lock(&phydev->lock);
>> +
>> +	if (enable && phydev->loopback_enabled) {
>> +		ret = -EBUSY;
>> +		goto out;
>> +	}
>> +
>> +	if (!enable && !phydev->loopback_enabled) {
>> +		ret = -EINVAL;
>> +		goto out;
>> +	}
>> +
> 
> if (enable == phydev->loopback_enabled)
One if statement don't work here, it returns different error code.

> 
>> +	if (phydev->drv && phydrv->set_loopback)
>> +		ret = phydrv->set_loopback(phydev, enable);
>> +	else
>> +		ret = -EOPNOTSUPP;
>> +
>> +	if (ret)
>> +		goto out;
>> +
>> +	phydev->loopback_enabled = enable;
>> +
>> +out:
>> +	mutex_unlock(&phydev->lock);
>> +	return ret;
>> +}
>> +EXPORT_SYMBOL(phy_loopback);
>> +
>

Best Regards
Yunsheng