net : phy: marvell: Speedup TDR data retrieval by only changing page once
Getting the TDR data requires a large number of MDIO bus transactions. The number can however be reduced if the page is only changed once. Add the needed locking to allow this, and make use of unlocked read/write methods where needed. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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