On Thu, Aug 24, 2017 at 07:45:19PM +0200, Andrew Lunn wrote:

quoted

The 88x3310 driver in the kernel knows about these combinations and
sets the phy interface parameter correctly depending on whether the
PHY has configured itself for copper at whatever speed or SFP+.

So when the PHY decides to swap from copper to fibre etc, is the
phylib state machine kept up to date. Does it see a down, followed by
an up?

I'd have to re-check to make sure, but I believe it does, because the
negotiation is held off on the "other" media until the currently active
link has gone down.

-- 
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