Merge branch 'net-bcmgenet-restore-internal-EPHY-support'

Doug Berger says:

====================
net: bcmgenet: restore internal EPHY support (part 2)

This is a follow up to my previous submission (see [1]).

The first commit provides what is intended to be a complete solution
for the issues that can result from insufficient clocking of the MAC
during reset of its state machines. It should be backported to the
stable releases.

It is intended to replace the partial solution of commit 1f515486
("net: bcmgenet: soft reset 40nm EPHYs before MAC init") which is
reverted by the second commit of this series and should not be back-
ported as noted in [2].

The third commit corrects a timing hazard with a polled PHY that can
occur when the MAC resumes and also when a v3 internal EPHY is reset
by the change in commit 25382b99 ("net: bcmgenet: reset 40nm EPHY
on energy detect"). It is expected that commit 25382b99 be back-
ported to stable first before backporting this commit.

[1] https://lkml.org/lkml/2019/10/16/1706
[2] https://lkml.org/lkml/2019/10/31/749


====================

Signed-off-by: David S. Miller <davem@davemloft.net>