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
Andrew
