On Wed, Oct 28, 2020 at 11:14:26PM +0100, Marek Behún wrote:

RollBall SFPs contain a Marvell 88X3310 PHY, but by default the MACTYPE
is set to 10GBASE-R with Rate Matching.

Some devices (for example those based on Armada 38x) only support up to
2500base-x SerDes modes.

Change the PHY's MACTYPE to 4 (which means changing between 10gbase-r,
5gbase-r, 2500base-x ans SGMII depending on copper speed) if this is the
case (which is infered from phydev->interface).

Signed-off-by: Marek Behún <kabel@kernel.org>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Russell King <redacted>

This'll do as a stop-gap until we have a better way to determine which
MACTYPE mode we should be using.

-- 
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