net: dsa: mv88e6xxx: Cache the port cmode
The ports CMODE indicates the type of link between the MAC and the PHY. It is used often in the SERDES code. Rather than read it each time, cache its value. Signed-off-by: NAndrew Lunn <andrew@lunn.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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