netdev - Re: [PATCH] net: phy: realtek: Add dummy stubs for MMD register access for rtl8211b

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Message-ID: <20180319125113.GA17024@pek-khao-d2>
Date:   Mon, 19 Mar 2018 20:51:13 +0800
From:   Kevin Hao <haokexin@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        Claudiu Manoil <claudiu.manoil@....com>
Subject: Re: [PATCH] net: phy: realtek: Add dummy stubs for MMD register
 access for rtl8211b

On Mon, Mar 19, 2018 at 01:39:39PM +0100, Andrew Lunn wrote:
> On Mon, Mar 19, 2018 at 08:05:47PM +0800, Kevin Hao wrote:
> > The Ethernet on mpc8315erdb is broken since commit b6b5e8a69118
> > ("gianfar: Disable EEE autoneg by default"). The reason is that
> > even though the rtl8211b doesn't support the MMD extended registers
> > access, it does return some random values if we trying to access
> > the MMD register via indirect method. This makes it seem that the
> > EEE is supported by this phy device. And the subsequent writing to
> > the MMD registers does cause the phy malfunction. So add dummy stubs
> > for the MMD register access to fix this issue.
> 
> Hi Kevin
> 
> The Micrel PHY has the same problem. Please add generic
> genphy_read_mmd_unsupported() and genphy_write_mmd_unsupported() to
> phy_device.c, and use them from both the Micrel and Realtek PHY
> drivers.
> 
> Also, a return value of -EOPNOTSUPP is more appropriate.

Thanks for the suggestion. Will do.

Thanks,
Kevin

> 
> Thanks
> 
> 	Andrew

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