linux-kernel - Re: [PATCH] net: phy: DP83TC811: Introduce support for the DP83TC811 phy

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Date:   Wed, 9 May 2018 09:00:03 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <f.fainelli@...il.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: phy: DP83TC811: Introduce support for the DP83TC811
 phy

Andrew

On 05/09/2018 08:58 AM, Andrew Lunn wrote:
> On Wed, May 09, 2018 at 08:50:58AM -0500, Dan Murphy wrote:
>> Andrew
>>
>> Thanks for the review
>>
>> On 05/09/2018 08:43 AM, Andrew Lunn wrote:
>>>> +static int dp83811_config_aneg(struct phy_device *phydev)
>>>> +{
>>>> +	int err;
>>>> +	int value;
>>>> +
>>>> +	value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
>>>> +	if (phydev->autoneg == AUTONEG_ENABLE) {
>>>> +		err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
>>>> +				(DP83811_SGMII_AUTO_NEG_EN | value));
>>>> +		if (err < 0)
>>>> +			return err;
>>>> +	} else {
>>>> +		err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
>>>> +				(~DP83811_SGMII_AUTO_NEG_EN & value));
>>>> +		if (err < 0)
>>>> +			return err;
>>>> +	}
>>>> +
>>>
>>> Hi Dan
>>>
>>> You say SGMII is unreliable on one of these devices. Should you check
>>> phydev->interface before enabling SGMII autoneg?
>>
>>
>> If SGMII enable bit(12) is not set in the device then setting auto neg has no affect on the device.
> 
> Ah, O.K. Maybe add a comment about this.
> 

I will add the check it will be clearer if written in code and explicit as opposed to explaining it.

Dan

>>>> +
>>>> +static int dp83811_config_init(struct phy_device *phydev)
>>>> +{
>>>> +	int err;
>>>> +	int value;
>>>> +
>>>> +	err = genphy_config_init(phydev);
>>>> +	if (err < 0)
>>>> +		return err;
>>>> +
>>>> +	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
>>>> +		value = phy_read(phydev, MII_DP83811_SGMII_CTRL);
>>>> +		if (!(value & DP83811_SGMII_EN)) {
>>>> +			err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
>>>> +					(DP83811_SGMII_EN | value));
>>>> +			if (err < 0)
>>>> +				return err;
>>>> +		} else {
>>>> +			err = phy_write(phydev, MII_DP83811_SGMII_CTRL,
>>>> +				(~DP83811_SGMII_EN & value));
>>>> +			if (err < 0)
>>>> +				return err;
>>>> +		}
>>>
>>> This looks to be a duplicate of dp83811_config_aneg()?
>>
>> It is almost the same but this function sets bit 12 and aneg function sets bit 13.
>> We can have SGMII with or without auto neg.
> 
> Yep, i missed the difference.
> 
>      Andrew
> 


-- 
------------------
Dan Murphy