Add cable test support for Micrel KSZ9x31 PHYs.
Tested on i.MX8M Mini with KSZ9131RNX in 100/Full mode with pairs shuffled
before magnetics:
(note: Cable test started/completed messages are omitted)
mx8mm-ksz9131-a-d-connected$ ethtool --cable-test eth0
Pair A code OK
Pair B code Short within Pair
Pair B, fault length: 0.80m
Pair C code Short within Pair
Pair C, fault length: 0.80m
Pair D code OK
mx8mm-ksz9131-a-b-connected$ ethtool --cable-test eth0
Pair A code OK
Pair B code OK
Pair C code Short within Pair
Pair C, fault length: 0.00m
Pair D code Short within Pair
Pair D, fault length: 0.00m
Tested on R8A77951 Salvator-XS with KSZ9031RNX and all four pairs connected:
(note: Cable test started/completed messages are omitted)
r8a7795-ksz9031-all-connected$ ethtool --cable-test eth0
Pair A code OK
Pair B code OK
Pair C code OK
Pair D code OK
The CTRL1000 CTL1000_ENABLE_MASTER and CTL1000_AS_MASTER bits are not
restored by calling phy_init_hw(), they must be manually cached in
ksz9x31_cable_test_start() and restored at the end of
ksz9x31_cable_test_get_status().
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Heiner Kallweit <hkallweit1@gmail.com>
Cc: Oleksij Rempel <linux@rempel-privat.de>
Cc: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20220407105534.85833-1-marex@denx.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
58389c00d4