linux-kernel - Re: [PATCH] net: ethernet: mediatek: fix warning in phy_start

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Message-ID: <8f58fd47-f7ff-399d-4c20-76fe4d72ba9a@gmail.com>
Date:   Tue, 8 Jan 2019 20:42:53 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Sean Wang <sean.wang@...nel.org>,
        Frank Wunderlich <frank-w@...lic-files.de>
Cc:     Felix Fietkau <nbd@...nwrt.org>, John Crispin <john@...ozen.org>,
        Nelson Chang <nelson.chang@...iatek.com>,
        "David S. Miller" <davem@...emloft.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: mediatek: fix warning in phy_start_aneg

On 08.01.2019 20:29, Sean Wang wrote:
> On Tue, Jan 8, 2019 at 11:07 AM Frank Wunderlich
> <frank-w@...lic-files.de> wrote:
>>
>>
>>> In mtk_phy_connect() I would say this complete block can be removed.
>>> All this is handled internally by phylib.
>>>
>>>       dev->phydev->autoneg = AUTONEG_ENABLE;
>>>       dev->phydev->speed = 0;
>>>       dev->phydev->duplex = 0;
>>>
>>>       phy_set_max_speed(dev->phydev, SPEED_1000);
>>>       phy_support_asym_pause(dev->phydev);
>>>       linkmode_copy(dev->phydev->advertising, dev->phydev->supported);
>>>       linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
>>>                        dev->phydev->advertising);
>>>       phy_start_aneg(dev->phydev);
>>>
>>> Could you please test this?
>>
>> seems to work well, no warning in dmesg
>>
>> traffic 940Mbit sending, 900 receive
>>
> 
> The change to phy initialized valve determined by phylib looks good to
> me and simplify the mac driver a lot. You could have it in v2.
> 
>>> And a further proposal:
>>> Instead of the open-coded dev_info() in mtk_phy_connect_node()
>>> you could use phy_attached_info().
>>
>> have not tried this yet...because it's only an info-message and needs different parameters...have to look how i can convert it
> 
> I think it can be done in a separate patch
> 
>>
>>> Calling phy_start() in the ndo_open callback is fine, you can leave
>>> it there.
>>
>> have it re-added
>>
>> pushed to my repo: https://github.com/frank-w/BPI-R2-4.14/commits/5.0-rc
>>
>> regards Frank
> 
When talking about improvements: Also this

if (dev->phydev->link)
		netif_carrier_on(dev);
	else
		netif_carrier_off(dev);

in mtk_phy_link_adjust() isn't needed. It's done by phy_link_change() in phylib.